772 lines
18 KiB
C
772 lines
18 KiB
C
/*
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* Copyright 2006, Freie Universitaet Berlin. All rights reserved.
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*
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* These sources were developed at the Freie Universitaet Berlin, Computer
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* Systems and Telematics group.
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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
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* are met:
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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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*
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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 the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Freie Universitaet Berlin (FUB) nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* This software is provided by FUB and the contributors on an "as is"
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* basis, without any representations or warranties of any kind, express
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* or implied including, but not limited to, representations or
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* warranties of non-infringement, merchantability or fitness for a
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* particular purpose. In no event shall FUB or contributors be liable
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* 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
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* business interruption) however caused and on any theory of liability,
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* whether in contract, strict liability, or tort (including negligence
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* or otherwise) arising in any way out of the use of this software,
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* even if advised of the possibility of such damage.
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*
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* This implementation was originally developed by the CST group at the FUB.
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*/
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/**
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* \file cc1020.c
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* \author FUB ScatterWeb Developers, Michael Baar, Nicolas Tsiftes
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**/
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include "contiki.h"
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#include "contiki-msb430.h"
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#include "cc1020-internal.h"
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#include "cc1020.h"
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#include "lib/random.h"
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#include "lib/crc16.h"
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#include "net/rime/rimestats.h"
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#include "dev/irq.h"
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#include "dev/dma.h"
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#include "energest.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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static int cc1020_calibrate(void);
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static int cc1020_setupTX(int);
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static int cc1020_setupRX(int);
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static void cc1020_setupPD(void);
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static void cc1020_wakeupTX(int);
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static void cc1020_wakeupRX(int);
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static uint8_t cc1020_read_reg(uint8_t addr);
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static void cc1020_write_reg(uint8_t addr, uint8_t adata);
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static void cc1020_load_config(const uint8_t *);
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static void cc1020_reset(void);
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/* current mode of cc1020 chip */
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static volatile enum cc1020_state cc1020_state = CC1020_OFF;
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static volatile uint8_t cc1020_rxbuf[HDRSIZE + CC1020_BUFFERSIZE];
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static uint8_t cc1020_txbuf[PREAMBLESIZE + SYNCWDSIZE + HDRSIZE +
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CC1020_BUFFERSIZE + TAILSIZE];
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/*static volatile enum cc1020_rxstate cc1020_rxstate = CC1020_RX_SEARCHING; */
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/* number of bytes in receive and transmit buffers respectively. */
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static uint16_t cc1020_rxlen;
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static uint16_t cc1020_txlen;
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/* received signal strength indicator reading for last received packet */
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static volatile uint8_t rssi;
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/* callback when a packet has been received */
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static uint8_t cc1020_pa_power = PA_POWER;
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static volatile int dma_done;
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static void (*receiver_callback)(const struct radio_driver *);
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const struct radio_driver cc1020_driver =
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{
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cc1020_send,
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cc1020_read,
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cc1020_set_receiver,
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cc1020_on,
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cc1020_off
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};
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#define MS_DELAY(x) clock_delay(354 * (x))
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PROCESS(cc1020_receiver_process, "CC1020 receiver");
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static void
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dma_callback(void)
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{
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dma_done = 1;
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}
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static void
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reset_receiver(void)
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{
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/* reset receiver */
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cc1020_rxlen = 0;
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if((cc1020_state & CC1020_TURN_OFF) && (cc1020_txlen == 0)) {
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cc1020_off();
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} else {
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CC1020_SET_OPSTATE(CC1020_RX | CC1020_RX_SEARCHING);
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ENABLE_RX_IRQ();
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}
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}
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void
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cc1020_init(const uint8_t *config)
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{
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cc1020_setupPD();
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cc1020_reset();
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cc1020_load_config(config);
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/* init tx buffer with preamble + syncword */
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memset(cc1020_txbuf, PREAMBLE, PREAMBLESIZE);
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memcpy((char *)cc1020_txbuf + PREAMBLESIZE, &syncword, SYNCWDSIZE);
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/* calibrate receiver */
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cc1020_wakeupRX(RX_CURRENT);
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if(!cc1020_calibrate()) {
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PRINTF("cc1020: rx calibration failed\n");
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}
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/* calibrate transmitter */
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cc1020_wakeupTX(TX_CURRENT);
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if(!cc1020_calibrate()) {
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PRINTF("cc1020: tx calibration failed\n");
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}
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/* power down */
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cc1020_setupPD();
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process_start(&cc1020_receiver_process, NULL);
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dma_subscribe(0, dma_callback);
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}
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void
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cc1020_set_rx(void)
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{
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int s;
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s = splhigh();
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/* Reset SEL for P3[1-3] (CC DIO, DIO, DCLK) and P3[4-5] (Camera Rx+Tx) */
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P3SEL &= ~0x3E;
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IFG1 &= ~(UTXIE0 | URXIE0); /* Clear interrupt flags */
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ME1 &= ~(UTXE0 | URXE0); /* Disable Uart0 Tx + Rx */
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UCTL0 = SWRST; /* U0 into reset state. */
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UCTL0 |= CHAR | SYNC; /* 8-bit character, SPI, Slave mode */
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/* CKPH works also, but not CKPH+CKPL or none of them!! */
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UTCTL0 = CKPL | STC;
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URCTL0 = 0x00;
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UBR00 = 0x00; /* No baudrate divider */
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UBR10 = 0x00; /* settings for a spi */
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UMCTL0 = 0x00; /* slave. */
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ME1 |= URXE0; /* Enable USART0 RXD, disabling does not yield any powersavings */
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P3SEL |= 0x0A; /* Select rx line and clk */
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UCTL0 &= ~SWRST; /* Clear reset bit */
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splx(s);
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/* configure driver */
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cc1020_rxlen = 0; /* receive buffer position to start */
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CC1020_SET_OPSTATE(CC1020_RX | CC1020_RX_SEARCHING); /* driver state to receive mode */
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/* configure radio */
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ENERGEST_ON(ENERGEST_TYPE_LISTEN);
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cc1020_wakeupRX(RX_CURRENT);
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cc1020_setupRX(RX_CURRENT);
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LNA_POWER_ON(); /* enable amplifier */
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/* activate */
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IE1 |= URXIE0; /* enable interrupt */
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}
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void
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cc1020_set_tx(void)
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{
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int s;
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/* configure radio rx */
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ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
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LNA_POWER_OFF(); /* power down LNA */
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s = splhigh();
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DISABLE_RX_IRQ();
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P3SEL &= ~0x02; /* Ensure Rx line is off */
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splx(s);
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/* configure radio tx */
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ENERGEST_ON(ENERGEST_TYPE_TRANSMIT);
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cc1020_wakeupTX(TX_CURRENT);
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cc1020_setupTX(TX_CURRENT);
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P3SEL |= 0x0C; /* select Tx line and clk */
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U0CTL |= SWRST; /* UART to reset mode */
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IFG1 &= ~UTXIFG0; /* Reset IFG. */
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/* configure driver */
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CC1020_SET_OPSTATE(CC1020_TX);
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}
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void
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cc1020_set_power(uint8_t pa_power)
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{
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cc1020_pa_power = pa_power;
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}
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int
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cc1020_send(const void *buf, unsigned short len)
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{
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int try;
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int normal_header = HDRSIZE + len;
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int i;
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uint16_t rxcrc = 0xFFFF; /* For checksum purposes */
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if(cc1020_state == CC1020_OFF) {
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return -2;
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}
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if(len > CC1020_BUFFERSIZE) {
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return -1;
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}
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/* The preamble and the sync word are already in buffer. */
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cc1020_txlen = PREAMBLESIZE + SYNCWDSIZE;
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/* header */
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cc1020_txbuf[cc1020_txlen++] = 0x00;
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cc1020_txbuf[cc1020_txlen++] = normal_header + CRC_LEN;
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/* Adding the checksum on header and data */
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rxcrc = crc16_add((uint8_t) (normal_header & 0xff), rxcrc);
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rxcrc = crc16_add((uint8_t) ((normal_header >> 8)& 0xff), rxcrc);
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for(i = 0; i < len; i++) {
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rxcrc = crc16_add((uint8_t) ((char*)buf)[i], rxcrc);
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}
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/* data to send */
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memcpy((char *)cc1020_txbuf + cc1020_txlen, buf, len);
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cc1020_txlen += len;
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/* Send checksum */
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cc1020_txbuf[cc1020_txlen++] = (uint8_t)(rxcrc >> 8);
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cc1020_txbuf[cc1020_txlen++] = (uint8_t)(rxcrc & 0xFF);
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/* suffix */
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cc1020_txbuf[cc1020_txlen++] = TAIL;
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cc1020_txbuf[cc1020_txlen++] = TAIL;
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/* Wait for the medium to become idle. */
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if(cc1020_carrier_sense()) {
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for(try = 0; try < CC1020_CONF_CCA_TIMEOUT; try++) {
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MS_DELAY(1);
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if(!cc1020_carrier_sense()) {
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break;
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}
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}
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if(try == CC1020_CONF_CCA_TIMEOUT) {
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PRINTF("cc1020: CCA failed (RSSI %d)\n", cc1020_get_rssi());
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return -3;
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}
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/* Then wait for a short pseudo-random time before sending. */
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clock_delay(100 * ((random_rand() + 1) & 0xf));
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}
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/* Switch to transceive mode. */
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cc1020_set_tx();
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/* Initiate radio transfer. */
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dma_done = 0;
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dma_transfer((unsigned char *)&TXBUF0, cc1020_txbuf, cc1020_txlen);
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while(!dma_done);
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ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT);
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RIMESTATS_ADD(lltx);
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/* clean up */
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cc1020_txlen = 0;
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if(cc1020_state & CC1020_TURN_OFF) {
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cc1020_off();
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} else {
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cc1020_set_rx();
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}
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return len;
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}
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int
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cc1020_read(void *buf, unsigned short size)
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{
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unsigned len;
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if(cc1020_rxlen <= HDRSIZE) {
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return 0;
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}
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len = cc1020_rxlen - HDRSIZE;
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if(len > size) {
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RIMESTATS_ADD(toolong);
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return -1;
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}
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memcpy(buf, (char *)cc1020_rxbuf + HDRSIZE, len);
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RIMESTATS_ADD(llrx);
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reset_receiver();
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return len;
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}
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void
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cc1020_set_receiver(void (*recv)(const struct radio_driver *))
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{
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receiver_callback = recv;
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}
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int
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cc1020_on(void)
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{
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if(cc1020_state == CC1020_OFF) {
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cc1020_state &= ~CC1020_TURN_OFF;
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cc1020_set_rx();
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}
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return 1;
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}
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int
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cc1020_off(void)
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{
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int s;
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if(cc1020_state & CC1020_RX_SEARCHING) {
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/* Discard the current read buffer when the radio is shutting down. */
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cc1020_rxlen = 0;
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LNA_POWER_OFF(); /* power down lna */
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s = splhigh();
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DISABLE_RX_IRQ();
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cc1020_state = CC1020_OFF;
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splx(s);
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cc1020_setupPD(); /* power down radio */
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ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
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cc1020_state = CC1020_OFF;
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} else {
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cc1020_state |= CC1020_TURN_OFF;
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}
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return 1;
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}
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uint8_t
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cc1020_get_rssi(void)
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{
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return (cc1020_read_reg(CC1020_RSS) & 0x7F);
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}
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uint8_t
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cc1020_get_packet_rssi(void)
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{
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return rssi;
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}
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int
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cc1020_carrier_sense(void)
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{
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return (cc1020_read_reg(CC1020_STATUS) & CARRIER_SENSE);
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}
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PROCESS_THREAD(cc1020_receiver_process, ev, data)
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{
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PROCESS_BEGIN();
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while(1) {
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ev = PROCESS_EVENT_NONE;
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PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
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if(receiver_callback != NULL) {
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/* CHECKSUM CHECK */
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uint16_t expected_crc = 0xffff;
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uint16_t actual_crc = -1;
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actual_crc = (cc1020_rxbuf[cc1020_rxlen - CRC_LEN] << 8) | cc1020_rxbuf[cc1020_rxlen - CRC_LEN + 1];
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cc1020_rxlen -= CRC_LEN;
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expected_crc = crc16_add((uint8_t) (cc1020_rxlen & 0xff), expected_crc);
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expected_crc = crc16_add((uint8_t) ((cc1020_rxlen >> 8) & 0xff),
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expected_crc);
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int i;
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for(i = HDRSIZE; i < cc1020_rxlen; i++){
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expected_crc = crc16_add(cc1020_rxbuf[i], expected_crc);
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}
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if(expected_crc == actual_crc) {
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receiver_callback(&cc1020_driver);
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} else {
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RIMESTATS_ADD(badcrc);
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reset_receiver();
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}
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}
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}
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PROCESS_END();
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}
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interrupt(UART0RX_VECTOR) cc1020_rxhandler(void)
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{
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static signed char syncbs;
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static union {
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struct {
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uint8_t b2;
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uint8_t b1;
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uint8_t b4;
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uint8_t b3;
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};
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struct {
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uint16_t i1;
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uint16_t i2;
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};
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} shiftbuf;
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static unsigned char pktlen;
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if(cc1020_state & CC1020_RX_SEARCHING) {
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shiftbuf.b1 = shiftbuf.b2;
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shiftbuf.b2 = shiftbuf.b3;
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shiftbuf.b3 = shiftbuf.b4;
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shiftbuf.b4 = RXBUF0;
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if(shiftbuf.i1 == 0xAAD3 && shiftbuf.b3 == 0x91) {
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/* 0 AA D3 91 00 | FF 00 | */
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syncbs = 0;
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cc1020_rxbuf[cc1020_rxlen++] = shiftbuf.b4;
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} else if(shiftbuf.i1 == 0x5569 && shiftbuf.i2 == 0xC880) {
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/* 1 55 69 C8 80 | 7F 80 | */
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syncbs = -1;
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} else if(shiftbuf.i1 == 0xAAB4 && shiftbuf.i2 == 0xE440) {
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/* 2 AA B4 E4 40 | 3F C0 | */
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syncbs = -2;
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} else if(shiftbuf.i1 == 0x555A && shiftbuf.i2 == 0x7220) {
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/* 3 55 5A 72 20 | 1F E0 | */
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syncbs = -3;
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} else if(shiftbuf.i1 == 0xAAAD && shiftbuf.i2 == 0x3910) {
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/* 4 AA AD 39 10 | 0F F0 | */
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syncbs = -4;
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} else if(shiftbuf.i1 == 0x5556 && shiftbuf.i2 == 0x9C88) {
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/* 5 55 56 9C 88 | 07 F8 | */
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syncbs = +3;
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} else if(shiftbuf.i1 == 0xAAAB && shiftbuf.i2 == 0x4E44) {
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/* 6 AA AB 4E 44 | 03 FC | */
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syncbs = +2;
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} else if(shiftbuf.i1 == 0x5555 && shiftbuf.i2 == 0xA722) {
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/* 7 55 55 A7 22 | 01 FE | */
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syncbs = +1;
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} else {
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return;
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}
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rssi = cc1020_get_rssi();
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CC1020_SET_OPSTATE(CC1020_RX | CC1020_RX_RECEIVING);
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} else if(cc1020_state & CC1020_RX_RECEIVING) {
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if(syncbs == 0) {
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cc1020_rxbuf[cc1020_rxlen] = RXBUF0;
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} else {
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shiftbuf.b3 = shiftbuf.b4;
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shiftbuf.b4 = RXBUF0;
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if(syncbs < 0) {
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shiftbuf.i1 = shiftbuf.i2 << -syncbs;
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cc1020_rxbuf[cc1020_rxlen] = shiftbuf.b1;
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} else {
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shiftbuf.i1 = shiftbuf.i2 >> syncbs;
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cc1020_rxbuf[cc1020_rxlen] = shiftbuf.b2;
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}
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}
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cc1020_rxlen++;
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if(cc1020_rxlen == HDRSIZE) {
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pktlen = ((struct cc1020_header *)cc1020_rxbuf)->length;
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if(pktlen == 0 || pktlen > sizeof (cc1020_rxbuf)) {
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cc1020_rxlen = 0;
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CC1020_SET_OPSTATE(CC1020_RX | CC1020_RX_SEARCHING);
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}
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} else if(cc1020_rxlen > HDRSIZE) {
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|
if(cc1020_rxlen == pktlen) {
|
|
/* Disable interrupts while processing the packet. */
|
|
DISABLE_RX_IRQ();
|
|
CC1020_SET_OPSTATE(CC1020_RX | CC1020_RX_PROCESSING);
|
|
_BIC_SR_IRQ(LPM3_bits);
|
|
process_poll(&cc1020_receiver_process);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
cc1020_write_reg(uint8_t addr, uint8_t adata)
|
|
{
|
|
unsigned int i;
|
|
uint8_t data;
|
|
|
|
data = addr << 1;
|
|
PSEL_ON;
|
|
|
|
/* Send address bits */
|
|
for(i = 0; i < 7; i++) {
|
|
PCLK_LOW;
|
|
if(data & 0x80) {
|
|
PDI_HIGH;
|
|
} else {
|
|
PDI_LOW;
|
|
}
|
|
data = data << 1;
|
|
PCLK_HIGH;
|
|
nop();
|
|
}
|
|
|
|
/* Send read/write bit */
|
|
/* Ignore bit in data, always use 1 */
|
|
PCLK_LOW;
|
|
PDI_HIGH;
|
|
PCLK_HIGH;
|
|
nop();
|
|
data = adata;
|
|
|
|
/* Send data bits */
|
|
for(i = 0; i < 8; i++) {
|
|
PCLK_LOW;
|
|
if(data & 0x80) {
|
|
PDI_HIGH;
|
|
} else {
|
|
PDI_LOW;
|
|
}
|
|
data = data << 1;
|
|
PCLK_HIGH;
|
|
nop();
|
|
}
|
|
|
|
PCLK_LOW;
|
|
PSEL_OFF;
|
|
}
|
|
|
|
static uint8_t
|
|
cc1020_read_reg(uint8_t addr)
|
|
{
|
|
unsigned int i;
|
|
uint8_t data;
|
|
|
|
data = addr << 1;
|
|
PSEL_ON;
|
|
|
|
/* Send address bits */
|
|
for(i = 0; i < 7; i++) {
|
|
PCLK_LOW;
|
|
if(data & 0x80) {
|
|
PDI_HIGH;
|
|
} else {
|
|
PDI_LOW;
|
|
}
|
|
data = data << 1;
|
|
PCLK_HIGH;
|
|
nop();
|
|
}
|
|
|
|
/* Send read/write bit */
|
|
/* Ignore bit in data, always use 0 */
|
|
PCLK_LOW;
|
|
PDI_LOW;
|
|
PCLK_HIGH;
|
|
nop();
|
|
PCLK_LOW;
|
|
|
|
/* Receive data bits */
|
|
for(i = 0; i < 8; i++) {
|
|
nop();
|
|
PCLK_HIGH;
|
|
nop();
|
|
data = data << 1;
|
|
if(PDO) {
|
|
data++;
|
|
}
|
|
PCLK_LOW;
|
|
}
|
|
|
|
PSEL_OFF;
|
|
|
|
return data;
|
|
}
|
|
|
|
static void
|
|
cc1020_load_config(const uint8_t * config)
|
|
{
|
|
int i;
|
|
|
|
for(i = 0; i < 0x28; i++)
|
|
cc1020_write_reg(i, config[i]);
|
|
}
|
|
|
|
static void
|
|
cc1020_reset(void)
|
|
{
|
|
/* Reset CC1020 */
|
|
cc1020_write_reg(CC1020_MAIN, 0x0FU & ~0x01U);
|
|
|
|
/* Bring CC1020 out of reset */
|
|
cc1020_write_reg(CC1020_MAIN, 0x1F);
|
|
}
|
|
|
|
static int
|
|
cc1020_calibrate(void)
|
|
{
|
|
unsigned int timeout_cnt;
|
|
|
|
/* Turn off PA to avoid spurs during calibration in TX mode */
|
|
cc1020_write_reg(CC1020_PA_POWER, 0x00);
|
|
|
|
/* Start calibration */
|
|
cc1020_write_reg(CC1020_CALIBRATE, 0xB5);
|
|
MS_DELAY(3);
|
|
while((cc1020_read_reg(CC1020_STATUS) & CAL_COMPLETE) == 0);
|
|
MS_DELAY(2);
|
|
|
|
/* Monitor lock */
|
|
for(timeout_cnt = LOCK_TIMEOUT; timeout_cnt > 0; timeout_cnt--) {
|
|
if(cc1020_read_reg(CC1020_STATUS) & LOCK_CONTINUOUS) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Restore PA_POWER */
|
|
cc1020_write_reg(CC1020_PA_POWER, cc1020_pa_power);
|
|
|
|
/* Return state of LOCK_CONTINUOUS bit */
|
|
return (cc1020_read_reg(CC1020_STATUS) & LOCK_CONTINUOUS) == LOCK_CONTINUOUS;
|
|
}
|
|
|
|
static int
|
|
cc1020_lock(void)
|
|
{
|
|
char lock_status;
|
|
int i;
|
|
|
|
/* Monitor LOCK, lasts 420 - 510 cycles @ 4505600 = 93 us - 113 us */
|
|
for(i = LOCK_TIMEOUT; i > 0; i--) {
|
|
lock_status = cc1020_read_reg(CC1020_STATUS) & LOCK_CONTINUOUS;
|
|
if(lock_status) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(lock_status == LOCK_CONTINUOUS) {
|
|
return LOCK_OK;
|
|
}
|
|
|
|
return cc1020_calibrate() ? LOCK_RECAL_OK : LOCK_NOK;
|
|
}
|
|
|
|
static int
|
|
cc1020_setupRX(int analog)
|
|
{
|
|
char lock_status;
|
|
|
|
/* Switch into RX, switch to freq. reg A */
|
|
cc1020_write_reg(CC1020_MAIN, 0x01);
|
|
lock_status = cc1020_lock();
|
|
|
|
/* Switch RX part of CC1020 on */
|
|
cc1020_write_reg(CC1020_INTERFACE, 0x02);
|
|
|
|
/* Return LOCK status to application */
|
|
return lock_status;
|
|
}
|
|
|
|
static int
|
|
cc1020_setupTX(int analog)
|
|
{
|
|
char lock_status;
|
|
|
|
/* Switch into TX, switch to freq. reg B */
|
|
cc1020_write_reg(CC1020_MAIN, 0xC1);
|
|
lock_status = cc1020_lock();
|
|
|
|
/* Restore PA_POWER */
|
|
cc1020_write_reg(CC1020_PA_POWER, cc1020_pa_power);
|
|
|
|
/* Turn OFF DCLK squelch in TX */
|
|
cc1020_write_reg(CC1020_INTERFACE, 0x01);
|
|
|
|
/* Return LOCK status to application */
|
|
return lock_status;
|
|
}
|
|
|
|
static void
|
|
cc1020_setupPD(void)
|
|
{
|
|
/*
|
|
* Power down components an reset all registers except MAIN
|
|
* to their default values.
|
|
*/
|
|
cc1020_write_reg(CC1020_MAIN,
|
|
RESET_N | BIAS_PD | FS_PD | XOSC_PD | PD_MODE_1);
|
|
|
|
/* Turn off the power amplifier. */
|
|
cc1020_write_reg(CC1020_PA_POWER, 0x00);
|
|
|
|
cc1020_write_reg(CC1020_POWERDOWN, 0x1F);
|
|
}
|
|
|
|
static void
|
|
cc1020_wakeupRX(int analog)
|
|
{
|
|
/* Turn on crystal oscillator core. */
|
|
cc1020_write_reg(CC1020_MAIN, 0x1B);
|
|
|
|
/* Setup bias current adjustment. */
|
|
cc1020_write_reg(CC1020_ANALOG, analog);
|
|
|
|
/*
|
|
* Wait for the crystal oscillator to stabilize.
|
|
* This typically takes 2-5 ms.
|
|
*/
|
|
MS_DELAY(5);
|
|
|
|
/* Turn on bias generator. */
|
|
cc1020_write_reg(CC1020_MAIN, 0x19);
|
|
|
|
/* Turn on frequency synthesizer. */
|
|
cc1020_write_reg(CC1020_MAIN, 0x11);
|
|
}
|
|
|
|
static void
|
|
cc1020_wakeupTX(int analog)
|
|
{
|
|
/* Turn on crystal oscillator core. */
|
|
cc1020_write_reg(CC1020_MAIN, 0xDB);
|
|
|
|
/* Setup bias current adjustment. */
|
|
cc1020_write_reg(CC1020_ANALOG, analog);
|
|
|
|
/*
|
|
* Wait for the crystal oscillator to stabilize.
|
|
* This typically takes 2-5 ms.
|
|
*/
|
|
MS_DELAY(5);
|
|
|
|
/* Turn on bias generator. */
|
|
cc1020_write_reg(CC1020_MAIN, 0xD9);
|
|
|
|
/* Turn on frequency synthesizer. */
|
|
MS_DELAY(1);
|
|
cc1020_write_reg(CC1020_MAIN, 0xD1);
|
|
}
|