1387 lines
49 KiB
C
1387 lines
49 KiB
C
/* Copyright (c) 2008, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Additional fixes for AVR contributed by:
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* Colin O'Flynn coflynn@newae.com
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* Eric Gnoske egnoske@gmail.com
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* Blake Leverett bleverett@gmail.com
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* Mike Vidales mavida404@gmail.com
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* Kevin Brown kbrown3@uccs.edu
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* Nate Bohlmann nate@elfwerks.com
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: radio.c,v 1.3 2009/07/05 18:50:44 dak664 Exp $
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*/
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/**
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* \brief This module contains the radio driver code for the Atmel
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* AT86RF230, '231, and '212 chips.
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*
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* \author Blake Leverett <bleverett@gmail.com>
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* Mike Vidales <mavida404@gmail.com>
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* Eric Gnoske <egnoske@gmail.com>
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*
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*/
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/** \addtogroup wireless
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* @{
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*/
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/**
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* \defgroup radiorf230 RF230 interface
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* @{
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*/
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/**
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* \file
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* This file contains radio driver code.
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*
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*/
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/*============================ INCLUDE =======================================*/
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#include <stdlib.h>
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#include <util/delay.h>
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#include "radio.h"
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#include "hal.h"
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#include "process.h"
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#include "sicslowmac.h"
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#include "frame.h"
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/*============================ MACROS ========================================*/
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#define RADIO_CCA_DONE_MASK (1 << 7) /**< Mask used to check the CCA_DONE bit. */
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#define RADIO_CCA_IDLE_MASK (1 << 6) /**< Mask used to check the CCA_STATUS bit. */
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#define RADIO_START_CCA (1) /**< Value in the CCA_REQUEST subregister that initiate a cca. */
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#define RADIO_TRANSMISSION_SUCCESS (0)
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#define RADIO_BUSY_CHANNEL (3)
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#define RADIO_MIN_IEEE_FRAME_LENGTH (5)
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/*============================ TYPEDEFS ======================================*/
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/** \brief This enumeration defines the necessary timing information for the
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* AT86RF230 radio transceiver. All times are in microseconds.
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*
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* These constants are extracted from the datasheet.
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*/
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typedef enum{
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TIME_TO_ENTER_P_ON = 510, /**< Transition time from VCC is applied to P_ON. */
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TIME_P_ON_TO_TRX_OFF = 510, /**< Transition time from P_ON to TRX_OFF. */
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TIME_SLEEP_TO_TRX_OFF = 880, /**< Transition time from SLEEP to TRX_OFF. */
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TIME_RESET = 6, /**< Time to hold the RST pin low during reset */
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TIME_ED_MEASUREMENT = 140, /**< Time it takes to do a ED measurement. */
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TIME_CCA = 140, /**< Time it takes to do a CCA. */
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TIME_PLL_LOCK = 150, /**< Maximum time it should take for the PLL to lock. */
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TIME_FTN_TUNING = 25, /**< Maximum time it should take to do the filter tuning. */
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TIME_NOCLK_TO_WAKE = 6, /**< Transition time from *_NOCLK to being awake. */
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TIME_CMD_FORCE_TRX_OFF = 1, /**< Time it takes to execute the FORCE_TRX_OFF command. */
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TIME_TRX_OFF_TO_PLL_ACTIVE = 180, /**< Transition time from TRX_OFF to: RX_ON, PLL_ON, TX_ARET_ON and RX_AACK_ON. */
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TIME_STATE_TRANSITION_PLL_ACTIVE = 1, /**< Transition time from PLL active state to another. */
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}radio_trx_timing_t;
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/*============================ VARIABLES =====================================*/
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static hal_rx_start_isr_event_handler_t user_rx_event;
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static hal_trx_end_isr_event_handler_t user_trx_end_event;
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static radio_rx_callback rx_frame_callback;
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static uint8_t rssi_val;
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static uint8_t rx_mode;
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uint8_t rxMode = RX_AACK_ON;
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static hal_rx_frame_t rx_frame;
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static parsed_frame_t parsed_frame;
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/*============================ PROTOTYPES ====================================*/
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bool radio_is_sleeping(void);
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static void radio_rx_start_event(uint32_t const isr_timestamp, uint8_t const frame_length);
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static void radio_trx_end_event(uint32_t const isr_timestamp);
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/** \brief Initialize the Transceiver Access Toolbox and lower layers.
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*
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* If the initialization is successful the radio transceiver will be in
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* TRX_OFF state.
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*
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* \note This function must be called prior to any of the other functions in
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* this file! Can be called from any transceiver state.
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*
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* \param cal_rc_osc If true, the radio's accurate clock is used to calibrate the
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* CPU's internal RC oscillator.
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*
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* \param rx_event Optional pointer to a user-defined function to be called on an
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* RX_START interrupt. Use NULL for no handler.
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*
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* \param trx_end_event Optional pointer to a user-defined function to be called on an
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* TRX_END interrupt. Use NULL for no handler.
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*
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* \param rx_callback Optional pointer to a user-defined function that receives
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* a frame from the radio one byte at a time. If the index parameter to
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* this callback is 0xff, then the function should reset its state and prepare
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* for a frame from the radio, with one call per byte.
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*
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* \retval RADIO_SUCCESS The radio transceiver was successfully initialized
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* and put into the TRX_OFF state.
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* \retval RADIO_UNSUPPORTED_DEVICE The connected device is not an Atmel
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* AT86RF230 radio transceiver.
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* \retval RADIO_TIMED_OUT The radio transceiver was not able to initialize and
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* enter TRX_OFF state within the specified time.
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*/
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radio_status_t
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radio_init(bool cal_rc_osc,
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hal_rx_start_isr_event_handler_t rx_event,
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hal_trx_end_isr_event_handler_t trx_end_event,
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radio_rx_callback rx_callback)
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{
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radio_status_t init_status = RADIO_SUCCESS;
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delay_us(TIME_TO_ENTER_P_ON);
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/* calibrate oscillator */
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if (cal_rc_osc){
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calibrate_rc_osc_32k();
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}
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/* Initialize Hardware Abstraction Layer. */
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hal_init();
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radio_reset_trx(); /* Do HW reset of radio transeiver. */
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/* Force transition to TRX_OFF. */
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hal_subregister_write(SR_TRX_CMD, CMD_FORCE_TRX_OFF);
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delay_us(TIME_P_ON_TO_TRX_OFF); /* Wait for the transition to be complete. */
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if (radio_get_trx_state() != TRX_OFF){
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init_status = RADIO_TIMED_OUT;
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} else {
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/* Read Version Number */
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uint8_t version_number = hal_register_read(RG_VERSION_NUM);
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if ((version_number != RF230_REVA) && (version_number != RF230_REVB))
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init_status = RADIO_UNSUPPORTED_DEVICE;
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else {
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if (hal_register_read(RG_MAN_ID_0) != SUPPORTED_MANUFACTURER_ID)
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init_status = RADIO_UNSUPPORTED_DEVICE;
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else
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hal_register_write(RG_IRQ_MASK, RF230_SUPPORTED_INTERRUPT_MASK);
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}
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}
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/* set callbacks for events. Save user's rx_event, which we will */
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/* call from radio_rx_start_event(). Same with trx_end */
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user_rx_event = rx_event;
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user_trx_end_event = trx_end_event;
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hal_set_rx_start_event_handler(radio_rx_start_event);
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hal_set_trx_end_event_handler(radio_trx_end_event);
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rx_frame_callback = rx_callback;
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return init_status;
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}
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/*---------------------------------------------------------------------------*/
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uint8_t *
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radio_frame_data(void)
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{
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return rx_frame.data;
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}
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uint8_t
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radio_frame_length(void)
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{
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return rx_frame.length;
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}
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/*---------------------------------------------------------------------------*/
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static void
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radio_rx_start_event(uint32_t const isr_timestamp, uint8_t const frame_length)
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{
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/* save away RSSI */
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rssi_val = hal_subregister_read( SR_RSSI );
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/* call user's rx_start event handler */
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if (user_rx_event)
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user_rx_event(isr_timestamp, frame_length);
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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radio_get_saved_rssi_value(void)
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{
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return rssi_val;
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}
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/*---------------------------------------------------------------------------*/
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static void
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radio_trx_end_event(uint32_t const isr_timestamp)
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{
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volatile uint8_t status;
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/* call user's trx_end event handler */
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if (user_trx_end_event){
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user_trx_end_event(isr_timestamp);
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return;
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}
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if (rx_mode){
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/* radio has received frame, store it away */
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parsed_frame.time = isr_timestamp;
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parsed_frame.rssi = rssi_val;
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hal_frame_read(&rx_frame, NULL);
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rx_frame_parse(&rx_frame, &parsed_frame);
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}
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if (!rx_mode){
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/* Put radio back into receive mode. */
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radio_set_trx_state(TRX_OFF);
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radio_set_trx_state(rxMode);
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/* transmit mode, put end-of-transmit event in queue */
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event_object_t event;
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event.event = 0;
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event.data = 0;
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status = hal_subregister_read(SR_TRAC_STATUS);
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switch(status){
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case TRAC_SUCCESS:
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case TRAC_SUCCESS_DATA_PENDING:
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event.event = MAC_EVENT_ACK;
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break;
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case TRAC_NO_ACK:
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case TRAC_CHANNEL_ACCESS_FAILURE:
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event.event = MAC_EVENT_NACK;
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break;
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case TRAC_SUCCESS_WAIT_FOR_ACK:
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/* should only happen in RX mode */
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case TRAC_INVALID:
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/* should never happen here */
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default:
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break;
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}
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if (event.event)
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mac_put_event(&event);
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process_post(&mac_process, event.event, event.data);
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}
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}
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/*----------------------------------------------------------------------------*/
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/** \brief This function will return the channel used by the radio transceiver.
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*
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* \return Current channel, 11 to 26.
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*/
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uint8_t
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radio_get_operating_channel(void)
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{
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return hal_subregister_read(SR_CHANNEL);
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}
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/*----------------------------------------------------------------------------*/
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/** \brief This function will change the operating channel.
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*
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* \param channel New channel to operate on. Must be between 11 and 26.
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*
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* \retval RADIO_SUCCESS New channel set.
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* \retval RADIO_WRONG_STATE Transceiver is in a state where the channel cannot
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* be changed (SLEEP).
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* \retval RADIO_INVALID_ARGUMENT Channel argument is out of bounds.
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* \retval RADIO_TIMED_OUT The PLL did not lock within the specified time.
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*/
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radio_status_t
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radio_set_operating_channel(uint8_t channel)
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{
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/*Do function parameter and state check.*/
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if ((channel < RF230_MIN_CHANNEL) ||
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(channel > RF230_MAX_CHANNEL)){
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return RADIO_INVALID_ARGUMENT;
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}
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if (radio_is_sleeping() == true){
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return RADIO_WRONG_STATE;
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}
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if (radio_get_operating_channel() == channel){
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return RADIO_SUCCESS;
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}
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/*Set new operating channel.*/
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hal_subregister_write(SR_CHANNEL, channel);
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/* Read current state and wait for the PLL_LOCK interrupt if the */
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/* radio transceiver is in either RX_ON or PLL_ON. */
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uint8_t trx_state = radio_get_trx_state();
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if ((trx_state == RX_ON) ||
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(trx_state == PLL_ON)){
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delay_us(TIME_PLL_LOCK);
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}
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radio_status_t channel_set_status = RADIO_TIMED_OUT;
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/* Check that the channel was set properly. */
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if (radio_get_operating_channel() == channel){
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channel_set_status = RADIO_SUCCESS;
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}
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return channel_set_status;
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}
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/*----------------------------------------------------------------------------*/
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/** \brief This function will read and return the output power level.
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*
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* \returns 0 to 15 Current output power in "TX power settings" as defined in
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* the radio transceiver's datasheet
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*/
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uint8_t
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radio_get_tx_power_level(void)
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{
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return hal_subregister_read(SR_TX_PWR);
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}
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/*----------------------------------------------------------------------------*/
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/** \brief This function will change the output power level.
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*
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* \param power_level New output power level in the "TX power settings"
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* as defined in the radio transceiver's datasheet.
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*
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* \retval RADIO_SUCCESS New output power set successfully.
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* \retval RADIO_INVALID_ARGUMENT The supplied function argument is out of bounds.
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* \retval RADIO_WRONG_STATE It is not possible to change the TX power when the
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* device is sleeping.
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*/
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radio_status_t
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radio_set_tx_power_level(uint8_t power_level)
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{
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/*Check function parameter and state.*/
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if (power_level > TX_PWR_17_2DBM){
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return RADIO_INVALID_ARGUMENT;
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}
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if (radio_is_sleeping() == true){
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return RADIO_WRONG_STATE;
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}
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/*Set new power level*/
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hal_subregister_write(SR_TX_PWR, power_level);
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return RADIO_SUCCESS;
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}
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/*----------------------------------------------------------------------------*/
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/** \brief This function returns the current CCA mode used.
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*
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* \return CCA mode currently used, 0 to 3.
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*/
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uint8_t
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radio_get_cca_mode(void)
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{
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return hal_subregister_read(SR_CCA_MODE);
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}
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/*----------------------------------------------------------------------------*/
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/** \brief This function returns the current ED threshold used by the CCA algorithm.
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*
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* \return Current ED threshold, 0 to 15.
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*/
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uint8_t
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radio_get_ed_threshold(void)
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{
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return hal_subregister_read(SR_CCA_ED_THRES);
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}
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/*----------------------------------------------------------------------------*/
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/** \brief This function will configure the Clear Channel Assessment algorithm.
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*
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* \param mode Three modes are available: Energy above threshold, carrier
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* sense only and carrier sense with energy above threshold.
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* \param ed_threshold Above this energy threshold the channel is assumed to be
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* busy. The threshold is given in positive dBm values.
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* Ex. -91 dBm gives a csThreshold of 91. Value range for
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* the variable is [61 to 91]. Only valid for the CCA_ED
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* and CCA_CARRIER_SENSE_ED modes.
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*
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* \retval RADIO_SUCCESS Mode and its parameters successfully changed.
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* \retval RADIO_WRONG_STATE This function cannot be called in the SLEEP state.
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* \retval RADIO_INVALID_ARGUMENT If one of the three function arguments are out
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* of bounds.
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*/
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radio_status_t
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radio_set_cca_mode(uint8_t mode, uint8_t ed_threshold)
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{
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/*Check function parameters and state.*/
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if ((mode != CCA_ED) &&
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(mode != CCA_CARRIER_SENSE) &&
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(mode != CCA_CARRIER_SENSE_WITH_ED)){
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return RADIO_INVALID_ARGUMENT;
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}
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/* Ensure that the ED threshold is within bounds. */
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if (ed_threshold > RF230_MAX_ED_THRESHOLD){
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return RADIO_INVALID_ARGUMENT;
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}
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/* Ensure that the radio transceiver is not sleeping. */
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if (radio_is_sleeping() == true){
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return RADIO_WRONG_STATE;
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}
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/*Change cca mode and ed threshold.*/
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hal_subregister_write(SR_CCA_MODE, mode);
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hal_subregister_write(SR_CCA_ED_THRES, ed_threshold);
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return RADIO_SUCCESS;
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}
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/*----------------------------------------------------------------------------*/
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/** \brief This function returns the Received Signal Strength Indication.
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*
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* \note This function should only be called from the: RX_ON and BUSY_RX. This
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* can be ensured by reading the current state of the radio transceiver
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* before executing this function!
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* \param rssi Pointer to memory location where RSSI value should be written.
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* \retval RADIO_SUCCESS The RSSI measurement was successful.
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* \retval RADIO_WRONG_STATE The radio transceiver is not in RX_ON or BUSY_RX.
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*/
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radio_status_t
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radio_get_rssi_value(uint8_t *rssi)
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{
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uint8_t current_state = radio_get_trx_state();
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radio_status_t retval = RADIO_WRONG_STATE;
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/*The RSSI measurement should only be done in RX_ON or BUSY_RX.*/
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if ((current_state == RX_ON) ||
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(current_state == BUSY_RX)){
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*rssi = hal_subregister_read(SR_RSSI);
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retval = RADIO_SUCCESS;
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}
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return retval;
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}
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/*----------------------------------------------------------------------------*/
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/** \brief This function returns the current threshold volatge used by the
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* battery monitor (BATMON_VTH).
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*
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* \note This function can not be called from P_ON or SLEEP. This is ensured
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* by reading the device state before calling this function.
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*
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* \return Current threshold voltage, 0 to 15.
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*/
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uint8_t
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radio_batmon_get_voltage_threshold(void)
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{
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return hal_subregister_read(SR_BATMON_VTH);
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}
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/*----------------------------------------------------------------------------*/
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/** \brief This function returns if high or low voltage range is used.
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|
*
|
|
* \note This function can not be called from P_ON or SLEEP. This is ensured
|
|
* by reading the device state before calling this function.
|
|
*
|
|
* \retval 0 Low voltage range selected.
|
|
* \retval 1 High voltage range selected.
|
|
*/
|
|
uint8_t
|
|
radio_batmon_get_voltage_range(void)
|
|
{
|
|
return hal_subregister_read(SR_BATMON_HR);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function is used to configure the battery monitor module
|
|
*
|
|
* \param range True means high voltage range and false low voltage range.
|
|
* \param voltage_threshold The datasheet defines 16 voltage levels for both
|
|
* low and high range.
|
|
* \retval RADIO_SUCCESS Battery monitor configured
|
|
* \retval RADIO_WRONG_STATE The device is sleeping.
|
|
* \retval RADIO_INVALID_ARGUMENT The voltage_threshold parameter is out of
|
|
* bounds (Not within [0 - 15]).
|
|
*/
|
|
radio_status_t
|
|
radio_batmon_configure(bool range, uint8_t voltage_threshold)
|
|
{
|
|
|
|
/*Check function parameters and state.*/
|
|
if (voltage_threshold > BATTERY_MONITOR_HIGHEST_VOLTAGE){
|
|
return RADIO_INVALID_ARGUMENT;
|
|
}
|
|
|
|
if (radio_is_sleeping() == true){
|
|
return RADIO_WRONG_STATE;
|
|
}
|
|
|
|
/*Write new voltage range and voltage level.*/
|
|
if (range == true){
|
|
hal_subregister_write(SR_BATMON_HR, BATTERY_MONITOR_HIGH_VOLTAGE);
|
|
} else {
|
|
hal_subregister_write(SR_BATMON_HR, BATTERY_MONITOR_LOW_VOLTAGE);
|
|
}
|
|
|
|
hal_subregister_write(SR_BATMON_VTH, voltage_threshold);
|
|
|
|
return RADIO_SUCCESS;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function returns the status of the Battery Monitor module.
|
|
*
|
|
* \note This function can not be called from P_ON or SLEEP. This is ensured
|
|
* by reading the device state before calling this function.
|
|
*
|
|
* \retval RADIO_BAT_LOW Battery voltage is below the programmed threshold.
|
|
* \retval RADIO_BAT_OK Battery voltage is above the programmed threshold.
|
|
*/
|
|
radio_status_t
|
|
radio_batmon_get_status(void)
|
|
{
|
|
|
|
radio_status_t batmon_status = RADIO_BAT_LOW;
|
|
|
|
if (hal_subregister_read(SR_BATMON_OK) !=
|
|
BATTERY_MONITOR_VOLTAGE_UNDER_THRESHOLD){
|
|
batmon_status = RADIO_BAT_OK;
|
|
}
|
|
|
|
return batmon_status;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function returns the current clock setting for the CLKM pin.
|
|
*
|
|
* \retval CLKM_DISABLED CLKM pin is disabled.
|
|
* \retval CLKM_1MHZ CLKM pin is prescaled to 1 MHz.
|
|
* \retval CLKM_2MHZ CLKM pin is prescaled to 2 MHz.
|
|
* \retval CLKM_4MHZ CLKM pin is prescaled to 4 MHz.
|
|
* \retval CLKM_8MHZ CLKM pin is prescaled to 8 MHz.
|
|
* \retval CLKM_16MHZ CLKM pin is not prescaled. Output is 16 MHz.
|
|
*/
|
|
uint8_t
|
|
radio_get_clock_speed(void)
|
|
{
|
|
return hal_subregister_read(SR_CLKM_CTRL);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function changes the prescaler on the CLKM pin.
|
|
*
|
|
* \param direct This boolean variable is used to determine if the frequency
|
|
* of the CLKM pin shall be changed directly or not. If direct
|
|
* equals true, the frequency will be changed directly. This is
|
|
* fine if the CLKM signal is used to drive a timer etc. on the
|
|
* connected microcontroller. However, the CLKM signal can also
|
|
* be used to clock the microcontroller itself. In this situation
|
|
* it is possible to change the CLKM frequency indirectly
|
|
* (direct == false). When the direct argument equlas false, the
|
|
* CLKM frequency will be changed first after the radio transceiver
|
|
* has been taken to SLEEP and awaken again.
|
|
* \param clock_speed This parameter can be one of the following constants:
|
|
* CLKM_DISABLED, CLKM_1MHZ, CLKM_2MHZ, CLKM_4MHZ, CLKM_8MHZ
|
|
* or CLKM_16MHZ.
|
|
*
|
|
* \retval RADIO_SUCCESS Clock speed updated. New state is TRX_OFF.
|
|
* \retval RADIO_INVALID_ARGUMENT Requested clock speed is out of bounds.
|
|
*/
|
|
radio_status_t
|
|
radio_set_clock_speed(bool direct, uint8_t clock_speed)
|
|
{
|
|
/*Check function parameter and current clock speed.*/
|
|
if (clock_speed > CLKM_16MHZ){
|
|
return RADIO_INVALID_ARGUMENT;
|
|
}
|
|
|
|
if (radio_get_clock_speed() == clock_speed){
|
|
return RADIO_SUCCESS;
|
|
}
|
|
|
|
/*Select to change the CLKM frequency directly or after returning from SLEEP.*/
|
|
if (direct == false){
|
|
hal_subregister_write(SR_CLKM_SHA_SEL, 1);
|
|
} else {
|
|
hal_subregister_write(SR_CLKM_SHA_SEL, 0);
|
|
}
|
|
|
|
hal_subregister_write(SR_CLKM_CTRL, clock_speed);
|
|
|
|
return RADIO_SUCCESS;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function calibrates the Single Side Band Filter.
|
|
*
|
|
* \retval RADIO_SUCCESS Filter is calibrated.
|
|
* \retval RADIO_TIMED_OUT The calibration could not be completed within time.
|
|
* \retval RADIO_WRONG_STATE This function can only be called from TRX_OFF or
|
|
* PLL_ON.
|
|
*/
|
|
radio_status_t
|
|
radio_calibrate_filter(void)
|
|
{
|
|
/*Check current state. Only possible to do filter calibration from TRX_OFF or PLL_ON.*/
|
|
uint8_t trx_state = radio_get_trx_state();
|
|
|
|
if ((trx_state != TRX_OFF) &&
|
|
(trx_state != PLL_ON)){
|
|
return RADIO_WRONG_STATE;
|
|
}
|
|
|
|
/* Start the tuning algorithm by writing one to the FTN_START subregister. */
|
|
hal_subregister_write(SR_FTN_START, 1);
|
|
delay_us(TIME_FTN_TUNING); /* Wait for the calibration to finish. */
|
|
|
|
radio_status_t filter_calibration_status = RADIO_TIMED_OUT;
|
|
|
|
/* Verify the calibration result. */
|
|
if (hal_subregister_read(SR_FTN_START) == FTN_CALIBRATION_DONE){
|
|
filter_calibration_status = RADIO_SUCCESS;
|
|
}
|
|
|
|
return filter_calibration_status;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function calibrates the PLL.
|
|
*
|
|
* \retval RADIO_SUCCESS PLL Center Frequency and Delay Cell is calibrated.
|
|
* \retval RADIO_TIMED_OUT The calibration could not be completed within time.
|
|
* \retval RADIO_WRONG_STATE This function can only be called from PLL_ON.
|
|
*/
|
|
radio_status_t
|
|
radio_calibrate_pll(void)
|
|
{
|
|
|
|
/*Check current state. Only possible to calibrate PLL from PLL_ON state*/
|
|
if (radio_get_trx_state() != PLL_ON){
|
|
return RADIO_WRONG_STATE;
|
|
}
|
|
|
|
/* Initiate the DCU and CF calibration loops. */
|
|
hal_subregister_write(SR_PLL_DCU_START, 1);
|
|
hal_subregister_write(SR_PLL_CF_START, 1);
|
|
|
|
/* Wait maximum 150 us for the PLL to lock. */
|
|
hal_clear_pll_lock_flag();
|
|
delay_us(TIME_PLL_LOCK);
|
|
|
|
radio_status_t pll_calibration_status = RADIO_TIMED_OUT;
|
|
|
|
if (hal_get_pll_lock_flag() > 0){
|
|
if (hal_subregister_read(SR_PLL_DCU_START) == PLL_DCU_CALIBRATION_DONE){
|
|
if (hal_subregister_read(SR_PLL_CF_START) == PLL_CF_CALIBRATION_DONE){
|
|
pll_calibration_status = RADIO_SUCCESS;
|
|
}
|
|
}
|
|
}
|
|
|
|
return pll_calibration_status;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function return the Radio Transceivers current state.
|
|
*
|
|
* \retval P_ON When the external supply voltage (VDD) is
|
|
* first supplied to the transceiver IC, the
|
|
* system is in the P_ON (Poweron) mode.
|
|
* \retval BUSY_RX The radio transceiver is busy receiving a
|
|
* frame.
|
|
* \retval BUSY_TX The radio transceiver is busy transmitting a
|
|
* frame.
|
|
* \retval RX_ON The RX_ON mode enables the analog and digital
|
|
* receiver blocks and the PLL frequency
|
|
* synthesizer.
|
|
* \retval TRX_OFF In this mode, the SPI module and crystal
|
|
* oscillator are active.
|
|
* \retval PLL_ON Entering the PLL_ON mode from TRX_OFF will
|
|
* first enable the analog voltage regulator. The
|
|
* transceiver is ready to transmit a frame.
|
|
* \retval BUSY_RX_AACK The radio was in RX_AACK_ON mode and received
|
|
* the Start of Frame Delimiter (SFD). State
|
|
* transition to BUSY_RX_AACK is done if the SFD
|
|
* is valid.
|
|
* \retval BUSY_TX_ARET The radio transceiver is busy handling the
|
|
* auto retry mechanism.
|
|
* \retval RX_AACK_ON The auto acknowledge mode of the radio is
|
|
* enabled and it is waiting for an incomming
|
|
* frame.
|
|
* \retval TX_ARET_ON The auto retry mechanism is enabled and the
|
|
* radio transceiver is waiting for the user to
|
|
* send the TX_START command.
|
|
* \retval RX_ON_NOCLK The radio transceiver is listening for
|
|
* incomming frames, but the CLKM is disabled so
|
|
* that the controller could be sleeping.
|
|
* However, this is only true if the controller
|
|
* is run from the clock output of the radio.
|
|
* \retval RX_AACK_ON_NOCLK Same as the RX_ON_NOCLK state, but with the
|
|
* auto acknowledge module turned on.
|
|
* \retval BUSY_RX_AACK_NOCLK Same as BUSY_RX_AACK, but the controller
|
|
* could be sleeping since the CLKM pin is
|
|
* disabled.
|
|
* \retval STATE_TRANSITION The radio transceiver's state machine is in
|
|
* transition between two states.
|
|
*/
|
|
uint8_t
|
|
radio_get_trx_state(void)
|
|
{
|
|
return hal_subregister_read(SR_TRX_STATUS);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function checks if the radio transceiver is sleeping.
|
|
*
|
|
* \retval true The radio transceiver is in SLEEP or one of the *_NOCLK
|
|
* states.
|
|
* \retval false The radio transceiver is not sleeping.
|
|
*/
|
|
bool radio_is_sleeping(void)
|
|
{
|
|
bool sleeping = false;
|
|
|
|
/* The radio transceiver will be at SLEEP or one of the *_NOCLK states only if */
|
|
/* the SLP_TR pin is high. */
|
|
if (hal_get_slptr() != 0){
|
|
sleeping = true;
|
|
}
|
|
|
|
return sleeping;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will change the current state of the radio
|
|
* transceiver's internal state machine.
|
|
*
|
|
* \param new_state Here is a list of possible states:
|
|
* - RX_ON Requested transition to RX_ON state.
|
|
* - TRX_OFF Requested transition to TRX_OFF state.
|
|
* - PLL_ON Requested transition to PLL_ON state.
|
|
* - RX_AACK_ON Requested transition to RX_AACK_ON state.
|
|
* - TX_ARET_ON Requested transition to TX_ARET_ON state.
|
|
*
|
|
* \retval RADIO_SUCCESS Requested state transition completed
|
|
* successfully.
|
|
* \retval RADIO_INVALID_ARGUMENT Supplied function parameter out of bounds.
|
|
* \retval RADIO_WRONG_STATE Illegal state to do transition from.
|
|
* \retval RADIO_BUSY_STATE The radio transceiver is busy.
|
|
* \retval RADIO_TIMED_OUT The state transition could not be completed
|
|
* within resonable time.
|
|
*/
|
|
radio_status_t
|
|
radio_set_trx_state(uint8_t new_state)
|
|
{
|
|
uint8_t original_state;
|
|
|
|
/*Check function paramter and current state of the radio transceiver.*/
|
|
if (!((new_state == TRX_OFF) ||
|
|
(new_state == RX_ON) ||
|
|
(new_state == PLL_ON) ||
|
|
(new_state == RX_AACK_ON) ||
|
|
(new_state == TX_ARET_ON))){
|
|
return RADIO_INVALID_ARGUMENT;
|
|
}
|
|
|
|
if (radio_is_sleeping() == true){
|
|
return RADIO_WRONG_STATE;
|
|
}
|
|
|
|
// Wait for radio to finish previous operation
|
|
for(;;)
|
|
{
|
|
original_state = radio_get_trx_state();
|
|
if (original_state != BUSY_TX_ARET &&
|
|
original_state != BUSY_RX_AACK &&
|
|
original_state != BUSY_RX &&
|
|
original_state != BUSY_TX)
|
|
break;
|
|
}
|
|
|
|
if (new_state == original_state){
|
|
return RADIO_SUCCESS;
|
|
}
|
|
|
|
|
|
/* At this point it is clear that the requested new_state is: */
|
|
/* TRX_OFF, RX_ON, PLL_ON, RX_AACK_ON or TX_ARET_ON. */
|
|
|
|
/* The radio transceiver can be in one of the following states: */
|
|
/* TRX_OFF, RX_ON, PLL_ON, RX_AACK_ON, TX_ARET_ON. */
|
|
if(new_state == TRX_OFF){
|
|
radio_reset_state_machine(); /* Go to TRX_OFF from any state. */
|
|
} else {
|
|
/* It is not allowed to go from RX_AACK_ON or TX_AACK_ON and directly to */
|
|
/* TX_AACK_ON or RX_AACK_ON respectively. Need to go via RX_ON or PLL_ON. */
|
|
if ((new_state == TX_ARET_ON) &&
|
|
(original_state == RX_AACK_ON)){
|
|
/* First do intermediate state transition to PLL_ON, then to TX_ARET_ON. */
|
|
/* The final state transition to TX_ARET_ON is handled after the if-else if. */
|
|
hal_subregister_write(SR_TRX_CMD, PLL_ON);
|
|
delay_us(TIME_STATE_TRANSITION_PLL_ACTIVE);
|
|
} else if ((new_state == RX_AACK_ON) &&
|
|
(original_state == TX_ARET_ON)){
|
|
/* First do intermediate state transition to RX_ON, then to RX_AACK_ON. */
|
|
/* The final state transition to RX_AACK_ON is handled after the if-else if. */
|
|
hal_subregister_write(SR_TRX_CMD, RX_ON);
|
|
delay_us(TIME_STATE_TRANSITION_PLL_ACTIVE);
|
|
}
|
|
|
|
/* Any other state transition can be done directly. */
|
|
hal_subregister_write(SR_TRX_CMD, new_state);
|
|
|
|
/* When the PLL is active most states can be reached in 1us. However, from */
|
|
/* TRX_OFF the PLL needs time to activate. */
|
|
if (original_state == TRX_OFF){
|
|
delay_us(TIME_TRX_OFF_TO_PLL_ACTIVE);
|
|
} else {
|
|
delay_us(TIME_STATE_TRANSITION_PLL_ACTIVE);
|
|
}
|
|
} /* end: if(new_state == TRX_OFF) ... */
|
|
|
|
/*Verify state transition.*/
|
|
radio_status_t set_state_status = RADIO_TIMED_OUT;
|
|
|
|
if (radio_get_trx_state() == new_state){
|
|
set_state_status = RADIO_SUCCESS;
|
|
/* set rx_mode flag based on mode we're changing to */
|
|
if (new_state == RX_ON ||
|
|
new_state == RX_AACK_ON){
|
|
rx_mode = true;
|
|
} else {
|
|
rx_mode = false;
|
|
}
|
|
}
|
|
|
|
return set_state_status;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will put the radio transceiver to sleep.
|
|
*
|
|
* \retval RADIO_SUCCESS Sleep mode entered successfully.
|
|
* \retval RADIO_TIMED_OUT The transition to TRX_OFF took too long.
|
|
*/
|
|
radio_status_t
|
|
radio_enter_sleep_mode(void)
|
|
{
|
|
if (radio_is_sleeping() == true){
|
|
return RADIO_SUCCESS;
|
|
}
|
|
|
|
radio_reset_state_machine(); /* Force the device into TRX_OFF. */
|
|
|
|
radio_status_t enter_sleep_status = RADIO_TIMED_OUT;
|
|
|
|
if (radio_get_trx_state() == TRX_OFF){
|
|
/* Enter Sleep. */
|
|
hal_set_slptr_high();
|
|
enter_sleep_status = RADIO_SUCCESS;
|
|
}
|
|
|
|
return enter_sleep_status;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will take the radio transceiver from sleep mode and
|
|
* put it into the TRX_OFF state.
|
|
*
|
|
* \retval RADIO_SUCCESS Left sleep mode and entered TRX_OFF state.
|
|
* \retval RADIO_TIMED_OUT Transition to TRX_OFF state timed out.
|
|
*/
|
|
radio_status_t
|
|
radio_leave_sleep_mode(void)
|
|
{
|
|
/* Check if the radio transceiver is actually sleeping. */
|
|
if (radio_is_sleeping() == false){
|
|
return RADIO_SUCCESS;
|
|
}
|
|
|
|
hal_set_slptr_low();
|
|
delay_us(TIME_SLEEP_TO_TRX_OFF);
|
|
|
|
radio_status_t leave_sleep_status = RADIO_TIMED_OUT;
|
|
|
|
/* Ensure that the radio transceiver is in the TRX_OFF state. */
|
|
if (radio_get_trx_state() == TRX_OFF){
|
|
leave_sleep_status = RADIO_SUCCESS;
|
|
}
|
|
|
|
return leave_sleep_status;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will reset the state machine (to TRX_OFF) from any of
|
|
* its states, except for the SLEEP state.
|
|
*/
|
|
void
|
|
radio_reset_state_machine(void)
|
|
{
|
|
hal_set_slptr_low();
|
|
delay_us(TIME_NOCLK_TO_WAKE);
|
|
hal_subregister_write(SR_TRX_CMD, CMD_FORCE_TRX_OFF);
|
|
delay_us(TIME_CMD_FORCE_TRX_OFF);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will reset all the registers and the state machine of
|
|
* the radio transceiver.
|
|
*/
|
|
void
|
|
radio_reset_trx(void)
|
|
{
|
|
hal_set_rst_low();
|
|
hal_set_slptr_low();
|
|
delay_us(TIME_RESET);
|
|
hal_set_rst_high();
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will enable or disable automatic CRC during frame
|
|
* transmission.
|
|
*
|
|
* \param auto_crc_on If this parameter equals true auto CRC will be used for
|
|
* all frames to be transmitted. The framelength must be
|
|
* increased by two bytes (16 bit CRC). If the parameter equals
|
|
* false, the automatic CRC will be disabled.
|
|
*/
|
|
void
|
|
radio_use_auto_tx_crc(bool auto_crc_on)
|
|
{
|
|
if (auto_crc_on == true){
|
|
hal_subregister_write(SR_TX_AUTO_CRC_ON, 1);
|
|
} else {
|
|
hal_subregister_write(SR_TX_AUTO_CRC_ON, 0);
|
|
}
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will download a frame to the radio transceiver's
|
|
* transmit buffer and send it.
|
|
*
|
|
* \param data_length Length of the frame to be transmitted. 1 to 128 bytes are the valid lengths.
|
|
* \param *data Pointer to the data to transmit
|
|
*
|
|
* \retval RADIO_SUCCESS Frame downloaded and sent successfully.
|
|
* \retval RADIO_INVALID_ARGUMENT If the dataLength is 0 byte or more than 127
|
|
* bytes the frame will not be sent.
|
|
* \retval RADIO_WRONG_STATE It is only possible to use this function in the
|
|
* PLL_ON and TX_ARET_ON state. If any other state is
|
|
* detected this error message will be returned.
|
|
*/
|
|
radio_status_t
|
|
radio_send_data(uint8_t data_length, uint8_t *data)
|
|
{
|
|
/*Check function parameters and current state.*/
|
|
if (data_length > RF230_MAX_TX_FRAME_LENGTH){
|
|
return RADIO_INVALID_ARGUMENT;
|
|
}
|
|
|
|
/* If we are busy, return */
|
|
if ((radio_get_trx_state() == BUSY_TX) || (radio_get_trx_state() == BUSY_TX_ARET) )
|
|
{
|
|
return RADIO_WRONG_STATE;
|
|
}
|
|
|
|
radio_set_trx_state(TRX_OFF);
|
|
radio_set_trx_state(TX_ARET_ON);
|
|
|
|
/*Do frame transmission.*/
|
|
/* Toggle the SLP_TR pin to initiate the frame transmission. */
|
|
hal_set_slptr_high();
|
|
hal_set_slptr_low();
|
|
|
|
hal_frame_write(data, data_length); /* Then write data to the frame buffer. */
|
|
|
|
return RADIO_SUCCESS;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will read the I_AM_COORD sub register.
|
|
*
|
|
* \retval 0 Not coordinator.
|
|
* \retval 1 Coordinator role enabled.
|
|
*/
|
|
uint8_t
|
|
radio_get_device_role(void)
|
|
{
|
|
return hal_subregister_read(SR_I_AM_COORD);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will set the I_AM_COORD sub register.
|
|
*
|
|
* \param[in] i_am_coordinator If this parameter is true, the associated
|
|
* coordinator role will be enabled in the radio
|
|
* transceiver's address filter.
|
|
* False disables the same feature.
|
|
*/
|
|
void
|
|
radio_set_device_role(bool i_am_coordinator)
|
|
{
|
|
hal_subregister_write(SR_I_AM_COORD, i_am_coordinator);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will return the PANID used by the address filter.
|
|
*
|
|
* \retval Any value from 0 to 0xFFFF.
|
|
*/
|
|
uint16_t
|
|
radio_get_pan_id(void)
|
|
{
|
|
|
|
uint8_t pan_id_15_8 = hal_register_read(RG_PAN_ID_1); /* Read pan_id_15_8. */
|
|
uint8_t pan_id_7_0 = hal_register_read(RG_PAN_ID_0); /* Read pan_id_7_0. */
|
|
|
|
uint16_t pan_id = ((uint16_t)(pan_id_15_8 << 8)) | pan_id_7_0;
|
|
|
|
return pan_id;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will set the PANID used by the address filter.
|
|
*
|
|
* \param new_pan_id Desired PANID. Can be any value from 0x0000 to 0xFFFF
|
|
*/
|
|
void
|
|
radio_set_pan_id(uint16_t new_pan_id)
|
|
{
|
|
|
|
uint8_t pan_byte = new_pan_id & 0xFF; /* Extract new_pan_id_7_0. */
|
|
hal_register_write(RG_PAN_ID_0, pan_byte);
|
|
|
|
pan_byte = (new_pan_id >> 8*1) & 0xFF; /* Extract new_pan_id_15_8. */
|
|
hal_register_write(RG_PAN_ID_1, pan_byte);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will return the current short address used by the
|
|
* address filter.
|
|
*
|
|
* \retval Any value from 0x0000 to 0xFFFF
|
|
*/
|
|
uint16_t
|
|
radio_get_short_address(void)
|
|
{
|
|
|
|
uint8_t short_address_15_8 = hal_register_read(RG_SHORT_ADDR_1); /* Read short_address_15_8. */
|
|
uint8_t short_address_7_0 = hal_register_read(RG_SHORT_ADDR_1); /* Read short_address_7_0. */
|
|
|
|
uint16_t short_address = ((uint16_t)(short_address_15_8 << 8)) | short_address_7_0;
|
|
|
|
return short_address;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will set the short address used by the address filter.
|
|
*
|
|
* \param new_short_address Short address to be used by the address filter.
|
|
*/
|
|
void
|
|
radio_set_short_address(uint16_t new_short_address)
|
|
{
|
|
|
|
uint8_t short_address_byte = new_short_address & 0xFF; /* Extract short_address_7_0. */
|
|
hal_register_write(RG_SHORT_ADDR_0, short_address_byte);
|
|
|
|
short_address_byte = (new_short_address >> 8*1) & 0xFF; /* Extract short_address_15_8. */
|
|
hal_register_write(RG_SHORT_ADDR_1, short_address_byte);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will read the extended address used by the address
|
|
* filter.
|
|
*
|
|
* \note In this function a pointer is used to convey the 64-bit result, since
|
|
* it is very inefficient to use the stack for this.
|
|
*
|
|
* \return Extended Address, any 64-bit value.
|
|
*/
|
|
void
|
|
radio_get_extended_address(uint8_t *extended_address)
|
|
{
|
|
*extended_address++ = hal_register_read(RG_IEEE_ADDR_0);
|
|
*extended_address++ = hal_register_read(RG_IEEE_ADDR_1);
|
|
*extended_address++ = hal_register_read(RG_IEEE_ADDR_2);
|
|
*extended_address++ = hal_register_read(RG_IEEE_ADDR_3);
|
|
*extended_address++ = hal_register_read(RG_IEEE_ADDR_4);
|
|
*extended_address++ = hal_register_read(RG_IEEE_ADDR_5);
|
|
*extended_address++ = hal_register_read(RG_IEEE_ADDR_6);
|
|
*extended_address = hal_register_read(RG_IEEE_ADDR_7);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will set a new extended address to be used by the
|
|
* address filter.
|
|
*
|
|
* \param extended_address Extended address to be used by the address filter.
|
|
*/
|
|
void
|
|
radio_set_extended_address(uint8_t *extended_address)
|
|
{
|
|
hal_register_write(RG_IEEE_ADDR_0, *extended_address++);
|
|
hal_register_write(RG_IEEE_ADDR_1, *extended_address++);
|
|
hal_register_write(RG_IEEE_ADDR_2, *extended_address++);
|
|
hal_register_write(RG_IEEE_ADDR_3, *extended_address++);
|
|
hal_register_write(RG_IEEE_ADDR_4, *extended_address++);
|
|
hal_register_write(RG_IEEE_ADDR_5, *extended_address++);
|
|
hal_register_write(RG_IEEE_ADDR_6, *extended_address++);
|
|
hal_register_write(RG_IEEE_ADDR_7, *extended_address++);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/** \brief This function will configure the CSMA algorithm used by the radio
|
|
* transceiver when transmitting data from TX_ARET_ON state.
|
|
*
|
|
* \param seed0 Lower 8 bits of the seed used for the random number generator
|
|
* in the CSMA algorithm. Value range: 0 to 255.
|
|
* \param be_csma_seed1 Is a combined argument of the MIN_BE, MAX_CSMA_RETRIES
|
|
* and SEED1 variables:
|
|
* -# MIN_BE: Bit[7:6] Minimum back-off exponent in the
|
|
* CSMA/CA algorithm.
|
|
* -# MAX_CSMA_RETRIES: Bit[5:3] Number of retries in
|
|
* TX_ARET_ON mode to repeat the CSMA/CA procedures
|
|
* before the ARET procedure gives up.
|
|
* -# SEED1: Bits[2:0] Higher 3 bits of CSMA_SEED, bits[10:8]
|
|
* Seed for the random number generator in the
|
|
* CSMA/CA algorithm.
|
|
* \retval RADIO_SUCCESS The CSMA algorithm was configured successfully.
|
|
* \retval RADIO_WRONG_STATE This function should not be called in the
|
|
* SLEEP state.
|
|
*/
|
|
radio_status_t
|
|
radio_configure_csma(uint8_t seed0, uint8_t be_csma_seed1)
|
|
{
|
|
|
|
/*Check state.*/
|
|
if (radio_is_sleeping() == true){
|
|
return RADIO_WRONG_STATE;
|
|
}
|
|
|
|
/*Extract parameters, and configure the CSMA-CA algorithm.*/
|
|
uint8_t back_off_exponent = (be_csma_seed1 & 0xC0) >> 6;
|
|
uint8_t csma_retries = (be_csma_seed1 & 0x38) >> 3;
|
|
uint8_t seed1 = (be_csma_seed1 & 0x07);
|
|
|
|
hal_subregister_write(SR_MAX_FRAME_RETRIES, 0); /* AT86RF230 rev A errata. */
|
|
hal_subregister_write(SR_MAX_CSMA_RETRIES, csma_retries);
|
|
hal_subregister_write(SR_MIN_BE, back_off_exponent);
|
|
hal_register_write(RG_CSMA_SEED_0, seed0);
|
|
hal_subregister_write(SR_CSMA_SEED_1, seed1);
|
|
|
|
return RADIO_SUCCESS;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/**
|
|
\brief Calibrate the internal RC oscillator
|
|
|
|
This function calibrates the internal RC oscillator, based
|
|
on the 1 MHz clock supplied by the AT86RF2xx. In order to
|
|
verify the calibration result you can program the CKOUT fuse
|
|
and monitor the CPU clock on an I/O pin.
|
|
|
|
\return TRUE if calibrate passed; FALSE if calibrate failed.
|
|
*/
|
|
bool
|
|
calibrate_rc_osc_clkm(void)
|
|
{
|
|
bool success = false;
|
|
|
|
/* Use the 1 MHz CLK_M from the AT86RF230. */
|
|
uint16_t temp, counter;
|
|
uint8_t osccal_saved;
|
|
uint8_t tccr2b, tccr1b, tccr1a;
|
|
|
|
/* in the following line, 1000000ULL represents the 1MHz input signal */
|
|
/* from the radio. 265 is the number of counts to overflow 8-bit */
|
|
/* timer 2. 32 is the divide by 32 prescaler for timer 1. F_CPU is */
|
|
/* the main clock frequency. */
|
|
#define TARGETVAL ((1000000ULL * 256 * 32) / F_CPU)
|
|
|
|
|
|
osccal_saved = OSCCAL;
|
|
cli();
|
|
|
|
radio_set_clock_speed(true, CLKM_1MHz);
|
|
|
|
/* Save current values of timer status. */
|
|
tccr2b = TCCR2B;
|
|
tccr1b = TCCR1B;
|
|
tccr1a = TCCR1A;
|
|
|
|
/* Stop timers 1 and 2. */
|
|
/* Set timer 1 to normal mode (no CTC, no PWM, just count). */
|
|
TCCR2B = 0;
|
|
TCCR1B = 0;
|
|
TCCR1A = 0;
|
|
|
|
for (counter = 0; counter < 1000; counter++){
|
|
/* Delete pending timer 1 and 2 interrupts, and clear the */
|
|
/* counters. */
|
|
TIFR1 = 0xFF;
|
|
TIFR2 = 0xFF;
|
|
TCNT2 = 0;
|
|
TCNT1 = 0;
|
|
/* Timer 2 driven from clock divided by 32 */
|
|
TCCR2B = (1 << CS21) | (1 << CS20);
|
|
/* Timer 1 driven with external clock */
|
|
TCCR1B = (1 << CS12) | (1 << CS11);
|
|
|
|
/* Wait for timer 2 to overflow. */
|
|
while (!(TIFR2 & (1 << TOV2))){
|
|
;
|
|
}
|
|
|
|
/* Stop timer 1. Now, TCNT1 contains the number of CPU cycles */
|
|
/* counted while timer 2 was counting */
|
|
TCCR1B = 0;
|
|
TCCR2B = 0;
|
|
|
|
temp = TCNT1;
|
|
|
|
if (temp < (uint16_t)(0.995 * TARGETVAL)){
|
|
/* Too fast, slow down */
|
|
OSCCAL--;
|
|
} else if (temp > (uint16_t)(1.005 * TARGETVAL)){
|
|
/* Too slow, speed up */
|
|
OSCCAL++;
|
|
} else {
|
|
/* We are within +/- 0.5 % of our target frequency, so we're */
|
|
/* done. */
|
|
success = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
radio_set_clock_speed(true, CLKM_DISABLED);
|
|
|
|
/* restore timer status regs */
|
|
TCCR2B = tccr2b;
|
|
TCCR1B = tccr1b;
|
|
TCCR1A = tccr1a;
|
|
if (!success){
|
|
/* We failed, therefore restore previous OSCCAL value. */
|
|
OSCCAL = osccal_saved;
|
|
}
|
|
|
|
return success;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/**
|
|
\brief Calibrate the internal RC oscillator
|
|
|
|
This function calibrates the internal RC oscillator, based
|
|
on an external 32KHz crystal connected to TIMER2. In order to
|
|
verify the calibration result you can program the CKOUT fuse
|
|
and monitor the CPU clock on an I/O pin.
|
|
*/
|
|
void
|
|
calibrate_rc_osc_32k(void)
|
|
{
|
|
/* Calibrate RC Oscillator: The calibration routine is done by clocking TIMER2
|
|
* from the external 32kHz crystal while running an internal timer simultaneously.
|
|
* The internal timer will be clocked at the same speed as the internal RC
|
|
* oscillator, while TIMER2 is running at 32768 Hz. This way it is not necessary
|
|
* to use a timed loop, and keep track cycles in timed loop vs. optimization
|
|
* and compiler.
|
|
*/
|
|
uint8_t osccal_original = OSCCAL;
|
|
volatile uint16_t temp;
|
|
|
|
/* This is bad practice, but seems to work. */
|
|
OSCCAL = 0x80;
|
|
|
|
|
|
// PRR0 &= ~((1 << PRTIM2)|(1 << PRTIM1)); /* Enable Timer 1 and 2 */
|
|
|
|
TIMSK2 = 0x00; /* Disable Timer/Counter 2 interrupts. */
|
|
TIMSK1 = 0x00; /* Disable Timer/Counter 1 interrupts. */
|
|
|
|
/* Enable TIMER/COUNTER 2 to be clocked from the external 32kHz clock crystal.
|
|
* Then wait for the timer to become stable before doing any calibration.
|
|
*/
|
|
ASSR |= (1 << AS2);
|
|
while (ASSR & ((1 << TCN2UB)|(1 << OCR2AUB)|(1 << TCR2AUB)|(1 << TCR2BUB))) { ; }
|
|
TCCR2B = 1 << CS20; /* run timer 2 at divide by 1 (32KHz) */
|
|
|
|
AVR_ENTER_CRITICAL_REGION();
|
|
|
|
uint8_t counter = 128;
|
|
bool cal_ok = false;
|
|
do{
|
|
/* wait for timer to be ready for updated config */
|
|
TCCR1B = 1 << CS10;
|
|
|
|
while (ASSR & ((1 << TCN2UB)|(1 << OCR2AUB)|(1 << TCR2AUB)|(1 << TCR2BUB))) { ; }
|
|
|
|
TCNT2 = 0x80;
|
|
TCNT1 = 0;
|
|
|
|
TIFR2 = 0xFF;
|
|
|
|
/* Wait for TIMER/COUNTER 2 to overflow. Stop TIMER/COUNTER 1 and 2, and
|
|
* read the counter value of TIMER/COUNTER 1. It will now contain the
|
|
* number of cpu cycles elapsed within the period.
|
|
*/
|
|
while (!(TIFR2 & (1 << TOV2))){
|
|
;
|
|
}
|
|
temp = TCNT1;
|
|
|
|
TCCR1B = 0;
|
|
|
|
#define cal_upper (31250*1.05) // 32812 = 0x802c
|
|
#define cal_lower (31250*0.95) // 29687 = 0x73f7
|
|
/* Iteratively reduce the error to be within limits */
|
|
if (temp < cal_lower) {
|
|
/* Too slow. Put the hammer down. */
|
|
OSCCAL++;
|
|
} else if (temp > cal_upper) {
|
|
/* Too fast, retard. */
|
|
OSCCAL--;
|
|
} else {
|
|
/* The CPU clock frequency is now within +/- 0.5% of the target value. */
|
|
cal_ok = true;
|
|
}
|
|
|
|
counter--;
|
|
} while ((counter != 0) && (false == cal_ok));
|
|
|
|
if (true != cal_ok) {
|
|
/* We failed, therefore restore previous OSCCAL value. */
|
|
OSCCAL = osccal_original;
|
|
}
|
|
|
|
TCCR2B = 0;
|
|
|
|
ASSR &= ~(1 << AS2);
|
|
|
|
/* Disable both timers again to save power. */
|
|
// PRR0 |= (1 << PRTIM2);/* |(1 << PRTIM1); */
|
|
|
|
AVR_LEAVE_CRITICAL_REGION();
|
|
}
|
|
|
|
/** @} */
|
|
/** @} */
|
|
/*EOF*/
|