470 lines
13 KiB
C
470 lines
13 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science
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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
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* are met:
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* 1. 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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* 2. 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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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* 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 INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: simple-cc2420.c,v 1.5 2007/04/03 19:05:44 adamdunkels Exp $
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*/
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/*
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* This code is almost device independent and should be easy to port.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "contiki.h"
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#if defined(__AVR__)
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#include <avr/io.h>
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#elif defined(__MSP430__)
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#include <io.h>
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#endif
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/* #include "dev/leds.h" */
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#include "dev/spi.h"
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#include "dev/simple-cc2420.h"
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#include "dev/cc2420_const.h"
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#define FOOTER1_CRC_OK 0x80
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#define FOOTER1_CORRELATION 0x7f
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#if 0
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...) do {} while (0)
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#endif
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/*---------------------------------------------------------------------------*/
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PROCESS(simple_cc2420_process, "CC2420 driver");
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/*---------------------------------------------------------------------------*/
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static void (* receiver_callback)(void);
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signed char simple_cc2420_last_rssi;
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u8_t simple_cc2420_last_correlation;
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static u8_t receive_on;
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/* Radio stuff in network byte order. */
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static u16_t pan_id;
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/*---------------------------------------------------------------------------*/
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static unsigned
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getreg(enum cc2420_register regname)
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{
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unsigned reg;
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int s = splhigh();
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FASTSPI_GETREG(regname, reg);
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splx(s);
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return reg;
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}
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/*---------------------------------------------------------------------------*/
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static void
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setreg(enum cc2420_register regname, unsigned value)
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{
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int s = splhigh();
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FASTSPI_SETREG(regname, value);
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splx(s);
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}
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/*---------------------------------------------------------------------------*/
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static void
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strobe(enum cc2420_register regname)
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{
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int s = splhigh();
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FASTSPI_STROBE(regname);
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splx(s);
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}
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/*---------------------------------------------------------------------------*/
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static unsigned
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status(void)
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{
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u8_t status;
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int s = splhigh();
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FASTSPI_UPD_STATUS(status);
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splx(s);
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return status;
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}
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/*---------------------------------------------------------------------------*/
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#define AUTOACK (1 << 4)
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#define ADR_DECODE (1 << 11)
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#define RXFIFO_PROTECTION (1 << 9)
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#define CORR_THR(n) (((n) & 0x1f) << 6)
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#define FIFOP_THR(n) ((n) & 0x7f)
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#define RXBPF_LOCUR (1 << 13);
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/*---------------------------------------------------------------------------*/
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void
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simple_cc2420_set_receiver(void (* recv)(void))
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{
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receiver_callback = recv;
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}
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/*---------------------------------------------------------------------------*/
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void
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simple_cc2420_init(void)
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{
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u16_t reg;
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{
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int s = splhigh();
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__cc2420_arch_init(); /* Initalize ports and SPI. */
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DISABLE_FIFOP_INT();
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FIFOP_INT_INIT();
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splx(s);
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}
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/* Turn on voltage regulator and reset. */
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SET_VREG_ACTIVE();
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//clock_delay(250); OK
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SET_RESET_ACTIVE();
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clock_delay(127);
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SET_RESET_INACTIVE();
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//clock_delay(125); OK
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/* Turn on the crystal oscillator. */
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strobe(CC2420_SXOSCON);
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/* Turn off automatic packet acknowledgment. */
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reg = getreg(CC2420_MDMCTRL0);
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reg &= ~AUTOACK;
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setreg(CC2420_MDMCTRL0, reg);
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/* Turn off address decoding. */
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reg = getreg(CC2420_MDMCTRL0);
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reg &= ~ADR_DECODE;
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setreg(CC2420_MDMCTRL0, reg);
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/* Change default values as recomended in the data sheet, */
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/* correlation threshold = 20, RX bandpass filter = 1.3uA. */
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setreg(CC2420_MDMCTRL1, CORR_THR(20));
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reg = getreg(CC2420_RXCTRL1);
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reg |= RXBPF_LOCUR;
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setreg(CC2420_RXCTRL1, reg);
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/* Set the FIFOP threshold to maximum. */
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setreg(CC2420_IOCFG0, FIFOP_THR(127));
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/* Turn off "Security enable" (page 32). */
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reg = getreg(CC2420_SECCTRL0);
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reg &= ~RXFIFO_PROTECTION;
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setreg(CC2420_SECCTRL0, reg);
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simple_cc2420_set_chan_pan_addr(11, 0xffff, 0x0000, NULL);
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process_start(&simple_cc2420_process, NULL);
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}
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/*---------------------------------------------------------------------------*/
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int
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simple_cc2420_send(const u8_t *payload, u8_t payload_len)
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{
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u8_t spiStatusByte;
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int s, i;
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/* struct hdr_802_15::len shall *not* be counted, thus the -1.
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* 2 == sizeof(footer).
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*/
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/* if(((hdr_len - 1) + payload_len + 2) > MAX_PACKET_LEN) {
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return -1;
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}*/
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/* This code uses the CC2420 CCA (Clear Channel Assessment) to
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* implement Carrier Sense Multiple Access with Collision Avoidance
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* (CSMA-CA) and requires the receiver to be enabled and ready.
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*/
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if(!receive_on) {
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return -2;
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}
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/* Wait for previous transmission to finish and RSSI. */
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do {
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spiStatusByte = status();
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if(!(spiStatusByte & BV(CC2420_RSSI_VALID))) { /* RSSI needed by CCA */
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continue;
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}
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} while(spiStatusByte & BV(CC2420_TX_ACTIVE));
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#if 0
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hdr->dst_pan = pan_id; /* Not at fixed position! xxx/bg */
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last_correspondent = hdr->dst; /* Not dst either. */
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last_used_seq++;
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hdr->seq = last_used_seq;
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cc2420_ack_received = 0;
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#endif
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/* Write packet to TX FIFO, appending FCS if AUTOCRC is enabled. */
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strobe(CC2420_SFLUSHTX); /* Cancel send that never started. */
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s = splhigh();
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/* FASTSPI_WRITE_FIFO(hdr, hdr_len);*/
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{
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u8_t total_len = payload_len + 2; /* 2 bytes footer. */
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FASTSPI_WRITE_FIFO(&total_len, 1);
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}
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FASTSPI_WRITE_FIFO(payload, payload_len);
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splx(s);
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PRINTF("simple_cc2420_send: wrote %d bytes\n", payload_len);
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/* if(hdr->dst == 0xffff) {
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int i;
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for(i = 1; i < 3; i++) {
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if(do_send() >= 0) {
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return 0;
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}
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clock_delay(i*256);
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}
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}*/
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if(FIFOP_IS_1 && !FIFO_IS_1) {
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/* RXFIFO overflow, send on retransmit. */
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PRINTF("rxfifo overflow!\n");
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return -4;
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}
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/* The TX FIFO can only hold one packet! Make sure to not overrun
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* FIFO by waiting for transmission to start here and synchronizing
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* with the CC2420_TX_ACTIVE check in cc2420_send.
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*
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* Note that we may have to wait up to 320 us (20 symbols) before
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* transmission starts.
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*/
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#ifdef TMOTE_SKY
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#define LOOP_20_SYMBOLS 100 /* 326us (msp430 @ 2.4576MHz) */
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#elif __AVR__
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#define LOOP_20_SYMBOLS 500 /* XXX */
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#endif
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strobe(CC2420_STXONCCA);
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for(i = LOOP_20_SYMBOLS; i > 0; i--) {
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if(SFD_IS_1) {
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PRINTF("simple_cc2420: do_send() transmission has started\n");
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return 0; /* Transmission has started. */
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}
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}
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PRINTF("simple_cc2420: do_send() transmission never started\n");
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return -3; /* Transmission never started! */
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}
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/*---------------------------------------------------------------------------*/
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void
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simple_cc2420_off(void)
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{
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u8_t spiStatusByte;
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if(receive_on == 0) {
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return;
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}
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receive_on = 0;
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/* Wait for transmission to end before turning radio off. */
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do {
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spiStatusByte = status();
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} while(spiStatusByte & BV(CC2420_TX_ACTIVE));
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strobe(CC2420_SRFOFF);
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DISABLE_FIFOP_INT();
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}
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/*---------------------------------------------------------------------------*/
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void
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simple_cc2420_on(void)
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{
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if(receive_on) {
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return;
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}
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receive_on = 1;
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strobe(CC2420_SRXON);
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strobe(CC2420_SFLUSHRX);
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ENABLE_FIFOP_INT();
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}
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/*---------------------------------------------------------------------------*/
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void
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simple_cc2420_set_chan_pan_addr(unsigned channel, /* 11 - 26 */
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unsigned pan,
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unsigned addr,
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const u8_t *ieee_addr)
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{
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/*
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* Subtract the base channel (11), multiply by 5, which is the
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* channel spacing. 357 is 2405-2048 and 0x4000 is LOCK_THR = 1.
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*/
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u8_t spiStatusByte;
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u16_t f = channel;
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int s;
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f = 5*(f - 11) + 357 + 0x4000;
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/*
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* Writing RAM requires crystal oscillator to be stable.
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*/
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do {
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spiStatusByte = status();
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} while(!(spiStatusByte & (BV(CC2420_XOSC16M_STABLE))));
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pan_id = pan;
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setreg(CC2420_FSCTRL, f);
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s = splhigh();
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FASTSPI_WRITE_RAM_LE(&pan, CC2420RAM_PANID, 2, f);
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FASTSPI_WRITE_RAM_LE(&addr, CC2420RAM_SHORTADDR, 2, f);
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if(ieee_addr != NULL) {
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FASTSPI_WRITE_RAM_LE(ieee_addr, CC2420RAM_IEEEADDR, 8, f);
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}
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splx(s);
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}
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/*---------------------------------------------------------------------------*/
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static volatile u8_t rx_fifo_remaining_bytes;
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/*---------------------------------------------------------------------------*/
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void
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radio_on(void)
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{
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simple_cc2420_on();
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}
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/*---------------------------------------------------------------------------*/
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void
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radio_off(void)
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{
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/* Turn the receiver off, but only if we have not recently received
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a packet. */
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if(rx_fifo_remaining_bytes == 0) {
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simple_cc2420_off();
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}
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Interrupt either leaves frame intact in FIFO or reads *only* the
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* MAC header and sets rx_fifo_remaining_bytes.
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*
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* In order to quickly empty the FIFO ack processing is done at
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* interrupt priority rather than poll priority.
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*/
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int
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__cc2420_intr(void)
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{
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u8_t length;
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/* const u8_t *const ack_footer = (u8_t *)&h.dst_pan;*/
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CLEAR_FIFOP_INT();
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if(spi_busy || rx_fifo_remaining_bytes > 0) {
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/* SPI bus hardware is currently used elsewhere (UART0 or I2C bus)
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* or we already have a packet in the works and will have to defer
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* interrupt processing of this packet in a fake interrupt.
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*/
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process_poll(&simple_cc2420_process);
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return 1;
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}
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FASTSPI_READ_FIFO_BYTE(length);
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if(length > SIMPLE_CC2420_MAX_PACKET_LEN) {
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/* Oops, we must be out of sync. */
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FASTSPI_STROBE(CC2420_SFLUSHRX);
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FASTSPI_STROBE(CC2420_SFLUSHRX);
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return 0;
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}
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/* The payload and footer is now left in the RX FIFO and will be
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* picked up asynchronously at poll priority in the cc2420_process
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* below.
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*/
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rx_fifo_remaining_bytes = length;
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process_poll(&simple_cc2420_process);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(simple_cc2420_process, ev, data)
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{
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PROCESS_BEGIN();
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while(1) {
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PROCESS_YIELD();
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if(receiver_callback != NULL) {
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receiver_callback();
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} else {
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PRINTF("simple_cc2420_process dropping %d bytes\n",
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rx_fifo_remaining_bytes);
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if(rx_fifo_remaining_bytes > 0) {
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int s;
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s = splhigh();
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FASTSPI_READ_FIFO_GARBAGE(rx_fifo_remaining_bytes);
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rx_fifo_remaining_bytes = 0; /* RX FIFO emptied! */
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splx(s);
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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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/*---------------------------------------------------------------------------*/
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int
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simple_cc2420_read(u8_t *buf, u8_t bufsize)
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{
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u8_t footer[2];
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int len;
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int s;
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len = rx_fifo_remaining_bytes;
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if(len > 0) {
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/* Read payload and two bytes of footer */
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if(len > bufsize) {
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PRINTF("simple_cc2420_poll too big len=%d\n", len);
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s = splhigh();
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FASTSPI_READ_FIFO_GARBAGE(len);
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rx_fifo_remaining_bytes = 0; /* RX FIFO emptied! */
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splx(s);
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len = 2; /* We eventually return len - 2 */
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} else {
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s = splhigh();
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FASTSPI_READ_FIFO_NO_WAIT(buf, len - 2);
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FASTSPI_READ_FIFO_NO_WAIT(footer, 2);
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rx_fifo_remaining_bytes = 0; /* RX FIFO emptied! */
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splx(s);
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if(footer[1] & FOOTER1_CRC_OK) {
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simple_cc2420_last_rssi = footer[0];
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simple_cc2420_last_correlation = footer[1] & FOOTER1_CORRELATION;
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/* if((h.fc0 & FC0_TYPE_MASK) == FC0_TYPE_DATA) {
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uip_len = len - 2;
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}*/
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}
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}
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}
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/* Clean up in case of FIFO overflow! This happens for every full
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* length frame and is signaled by FIFOP = 1 and FIFO = 0.
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*/
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if(FIFOP_IS_1 && !FIFO_IS_1) {
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strobe(CC2420_SFLUSHRX);
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strobe(CC2420_SFLUSHRX);
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}
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if(FIFOP_IS_1) {
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s = splhigh();
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__cc2420_intr(); /* Fake interrupt! */
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splx(s);
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}
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return len - 2; /* Remove two bytes for the footer. */
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}
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/*---------------------------------------------------------------------------*/
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