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contiki/platform/msb430/dev/cc1020.c

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/*
* Copyright 2006, Freie Universitaet Berlin. All rights reserved.
*
* These sources were developed at the Freie Universitaet Berlin, Computer
* Systems and Telematics group.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Freie Universitaet Berlin (FUB) nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided by FUB and the contributors on an "as is"
* basis, without any representations or warranties of any kind, express
* or implied including, but not limited to, representations or
* warranties of non-infringement, merchantability or fitness for a
* particular purpose. In no event shall FUB or contributors be liable
* for any direct, indirect, incidental, special, exemplary, or
* consequential damages (including, but not limited to, procurement of
* substitute goods or services; loss of use, data, or profits; or
* business interruption) however caused and on any theory of liability,
* whether in contract, strict liability, or tort (including negligence
* or otherwise) arising in any way out of the use of this software,
* even if advised of the possibility of such damage.
*
* This implementation was originally developed by the CST group at the FUB.
*/
/**
* \file cc1020.c
* \author FUB ScatterWeb Developers, Michael Baar, Nicolas Tsiftes
**/
#include <stdio.h>
#include <string.h>
#include "contiki.h"
#include "contiki-msb430.h"
#include "cc1020-internal.h"
#include "cc1020.h"
#include "lib/random.h"
#include "lib/crc16.h"
#include "net/rime/rimestats.h"
#include "dev/dma.h"
#include "sys/energest.h"
#include "isr_compat.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#define SEND_TIMEOUT 10
static int cc1020_calibrate(void);
static int cc1020_setupTX(int);
static int cc1020_setupRX(int);
static void cc1020_setupPD(void);
static void cc1020_wakeupTX(int);
static void cc1020_wakeupRX(int);
static uint8_t cc1020_read_reg(uint8_t addr);
static void cc1020_write_reg(uint8_t addr, uint8_t adata);
static void cc1020_load_config(const uint8_t *);
static void cc1020_reset(void);
static const uint8_t syncword[SYNCWORD_SIZE] = {0xD3, 0x91};
/* current mode of cc1020 chip */
static volatile enum cc1020_state cc1020_state = CC1020_OFF;
static volatile uint8_t cc1020_rxbuf[HDR_SIZE + CC1020_BUFFERSIZE];
static uint8_t cc1020_txbuf[PREAMBLE_SIZE + SYNCWORD_SIZE + HDR_SIZE +
CC1020_BUFFERSIZE + TAIL_SIZE];
/* number of bytes in receive and transmit buffers respectively. */
static uint8_t cc1020_rxlen;
static uint8_t cc1020_txlen;
/* received signal strength indicator reading for last received packet */
static volatile uint8_t rssi;
/* callback when a packet has been received */
static uint8_t cc1020_pa_power = PA_POWER;
static volatile char dma_done;
/* Radio driver AAPI functions. */
static int cc1020_init(void);
static int cc1020_prepare(const void *payload, unsigned short payload_len);
static int cc1020_transmit(unsigned short transmit_len);
static int cc1020_send(const void *payload, unsigned short payload_len);
static int cc1020_read(void *buf, unsigned short buf_len);
static int cc1020_channel_clear(void);
static int cc1020_receiving_packet(void);
static int cc1020_pending_packet(void);
static int cc1020_on(void);
static int cc1020_off(void);
const struct radio_driver cc1020_driver =
{
cc1020_init,
cc1020_prepare,
cc1020_transmit,
cc1020_send,
cc1020_read,
cc1020_channel_clear,
cc1020_receiving_packet,
cc1020_pending_packet,
cc1020_on,
cc1020_off
};
#define MS_DELAY(x) clock_delay(354 * (x))
PROCESS(cc1020_receiver_process, "CC1020 receiver");
static void
dma_callback(void)
{
dma_done = 1;
}
static void
reset_receiver(void)
{
/* reset receiver */
cc1020_rxlen = 0;
if((cc1020_state & CC1020_TURN_OFF) && (cc1020_txlen == 0)) {
cc1020_off();
} else {
CC1020_SET_OPSTATE(CC1020_RX | CC1020_RX_SEARCHING);
cc1020_set_rx();
ENABLE_RX_IRQ();
}
}
static int
cc1020_init(void)
{
cc1020_setupPD();
cc1020_reset();
cc1020_load_config(cc1020_config_19200);
/* init tx buffer with preamble + syncword */
memset(cc1020_txbuf, PREAMBLE, PREAMBLE_SIZE);
cc1020_txbuf[PREAMBLE_SIZE] = syncword[0];
cc1020_txbuf[PREAMBLE_SIZE + 1] = syncword[1];
/* calibrate receiver */
cc1020_wakeupRX(RX_CURRENT);
if(!cc1020_calibrate()) {
PRINTF("cc1020: rx calibration failed\n");
return -1;
}
/* calibrate transmitter */
cc1020_wakeupTX(TX_CURRENT);
if(!cc1020_calibrate()) {
PRINTF("cc1020: tx calibration failed\n");
return -1;
}
/* power down */
cc1020_setupPD();
process_start(&cc1020_receiver_process, NULL);
dma_subscribe(0, dma_callback);
return 0;
}
void
cc1020_set_rx(void)
{
int s;
s = splhigh();
/* Reset SEL for P3[1-3] (CC DIO, DIO, DCLK) and P3[4-5] (Camera Rx+Tx) */
P3SEL &= ~0x3E;
IFG1 &= ~(UTXIE0 | URXIE0); /* Clear interrupt flags */
ME1 &= ~(UTXE0 | URXE0); /* Disable Uart0 Tx + Rx */
UCTL0 = SWRST; /* U0 into reset state. */
UCTL0 |= CHAR | SYNC; /* 8-bit character, SPI, Slave mode */
/* CKPH works also, but not CKPH+CKPL or none of them!! */
UTCTL0 = CKPL | STC;
URCTL0 = 0x00;
UBR00 = 0x00; /* No baudrate divider */
UBR10 = 0x00; /* settings for a spi */
UMCTL0 = 0x00; /* slave. */
ME1 |= URXE0; /* Enable USART0 RXD, disabling does not yield any powersavings */
P3SEL |= 0x0A; /* Select rx line and clk */
UCTL0 &= ~SWRST; /* Clear reset bit */
splx(s);
/* configure driver */
cc1020_rxlen = 0; /* receive buffer position to start */
CC1020_SET_OPSTATE(CC1020_RX | CC1020_RX_SEARCHING); /* driver state to receive mode */
/* configure radio */
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
cc1020_wakeupRX(RX_CURRENT);
cc1020_setupRX(RX_CURRENT);
LNA_POWER_ON(); /* enable amplifier */
/* activate */
IE1 |= URXIE0; /* enable interrupt */
}
void
cc1020_set_tx(void)
{
int s;
/* configure radio rx */
ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
LNA_POWER_OFF(); /* power down LNA */
s = splhigh();
DISABLE_RX_IRQ();
P3SEL &= ~0x02; /* Ensure Rx line is off */
splx(s);
/* configure radio tx */
ENERGEST_ON(ENERGEST_TYPE_TRANSMIT);
cc1020_wakeupTX(TX_CURRENT);
cc1020_setupTX(TX_CURRENT);
P3SEL |= 0x0C; /* select Tx line and clk */
U0CTL |= SWRST; /* UART to reset mode */
IFG1 &= ~UTXIFG0; /* Reset IFG. */
/* configure driver */
CC1020_SET_OPSTATE(CC1020_TX);
}
void
cc1020_set_power(uint8_t pa_power)
{
cc1020_pa_power = pa_power;
}
static int
cc1020_prepare(const void *payload, unsigned short payload_len)
{
return -1;
}
static int
cc1020_transmit(unsigned short transmit_len)
{
return 0;
}
static int
cc1020_send(const void *buf, unsigned short len)
{
int normal_header = HDR_SIZE + len;
uint16_t rxcrc = 0xffff; /* For checksum purposes */
rtimer_clock_t timeout_time;
timeout_time = RTIMER_NOW() + RTIMER_SECOND / 1000 * SEND_TIMEOUT;
while(cc1020_state & CC1020_RX_RECEIVING) {
if(RTIMER_CLOCK_LT(timeout_time, RTIMER_NOW())) {
PRINTF("cc1020: transmission blocked by reception in progress\n");
return RADIO_TX_ERR;
}
}
if(cc1020_state == CC1020_OFF) {
return RADIO_TX_ERR;
}
if(len > CC1020_BUFFERSIZE) {
return RADIO_TX_ERR;
}
/* The preamble and the sync word are already in buffer. */
cc1020_txlen = PREAMBLE_SIZE + SYNCWORD_SIZE;
/* header */
cc1020_txbuf[cc1020_txlen++] = 0x00;
cc1020_txbuf[cc1020_txlen++] = normal_header + CRC_SIZE;
/* Adding the checksum on header and data */
rxcrc = crc16_add(normal_header & 0xff, rxcrc);
rxcrc = crc16_add((normal_header >> 8) & 0xff, rxcrc);
rxcrc = crc16_data(buf, len, rxcrc);
/* data to send */
memcpy((char *)cc1020_txbuf + cc1020_txlen, buf, len);
cc1020_txlen += len;
/* Send checksum */
cc1020_txbuf[cc1020_txlen++] = rxcrc >> 8;
cc1020_txbuf[cc1020_txlen++] = rxcrc & 0xff;
/* suffix */
cc1020_txbuf[cc1020_txlen++] = TAIL;
cc1020_txbuf[cc1020_txlen++] = TAIL;
/* Switch to transceive mode. */
cc1020_set_tx();
/* Initiate radio transfer. */
dma_done = 0;
dma_transfer((unsigned char *)&TXBUF0, cc1020_txbuf, cc1020_txlen);
while(!dma_done);
ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT);
RIMESTATS_ADD(lltx);
/* clean up */
cc1020_txlen = 0;
if(cc1020_state & CC1020_TURN_OFF) {
cc1020_off();
} else {
cc1020_set_rx();
}
return RADIO_TX_OK;
}
static int
cc1020_read(void *buf, unsigned short size)
{
unsigned len;
if(cc1020_rxlen <= HDR_SIZE) {
return 0;
}
len = cc1020_rxlen - HDR_SIZE;
if(len > size) {
RIMESTATS_ADD(toolong);
return -1;
}
memcpy(buf, (char *)cc1020_rxbuf + HDR_SIZE, len);
RIMESTATS_ADD(llrx);
reset_receiver();
return len;
}
static int
cc1020_channel_clear(void)
{
return (cc1020_read_reg(CC1020_STATUS) & CARRIER_SENSE);
}
static int
cc1020_receiving_packet(void)
{
return cc1020_state & CC1020_RX_RECEIVING;
}
static int
cc1020_pending_packet(void)
{
return cc1020_state & CC1020_RX_PROCESSING;
}
int
cc1020_on(void)
{
if(cc1020_state == CC1020_OFF) {
cc1020_set_rx();
} else if(cc1020_state & CC1020_TURN_OFF) {
cc1020_state &= ~CC1020_TURN_OFF;
cc1020_set_rx();
}
return 1;
}
int
cc1020_off(void)
{
int s;
if(cc1020_state != CC1020_OFF) {
if(cc1020_state & CC1020_RX_SEARCHING) {
/* Discard the current read buffer when the radio is shutting down. */
cc1020_rxlen = 0;
LNA_POWER_OFF(); /* power down lna */
s = splhigh();
DISABLE_RX_IRQ();
cc1020_state = CC1020_OFF;
splx(s);
cc1020_setupPD(); /* power down radio */
ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
cc1020_state = CC1020_OFF;
} else {
cc1020_state |= CC1020_TURN_OFF;
}
}
return 1;
}
uint8_t
cc1020_get_rssi(void)
{
return (cc1020_read_reg(CC1020_RSS) & 0x7F);
}
uint8_t
cc1020_get_packet_rssi(void)
{
return rssi;
}
PROCESS_THREAD(cc1020_receiver_process, ev, data)
{
int len;
PROCESS_BEGIN();
while(1) {
ev = PROCESS_EVENT_NONE;
PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
/* Verify the checksum. */
uint16_t expected_crc = 0xffff;
uint16_t actual_crc;
actual_crc = (cc1020_rxbuf[cc1020_rxlen - CRC_SIZE] << 8) |
cc1020_rxbuf[cc1020_rxlen - CRC_SIZE + 1];
cc1020_rxlen -= CRC_SIZE;
expected_crc = crc16_add(cc1020_rxlen & 0xff, expected_crc);
expected_crc = crc16_add((cc1020_rxlen >> 8) & 0xff, expected_crc);
expected_crc = crc16_data((char *)&cc1020_rxbuf[HDR_SIZE],
cc1020_rxlen - HDR_SIZE, expected_crc);
if(expected_crc == actual_crc) {
len = cc1020_read(packetbuf_dataptr(), PACKETBUF_SIZE);
packetbuf_set_datalen(len);
NETSTACK_RDC.input();
} else {
RIMESTATS_ADD(badcrc);
reset_receiver();
}
}
PROCESS_END();
}
ISR(UART0RX, cc1020_rxhandler)
{
static signed char syncbs;
static union {
struct {
uint8_t b2;
uint8_t b1;
uint8_t b4;
uint8_t b3;
};
struct {
uint16_t i1;
uint16_t i2;
};
} shiftbuf;
static unsigned char pktlen;
if(cc1020_state & CC1020_RX_SEARCHING) {
shiftbuf.b1 = shiftbuf.b2;
shiftbuf.b2 = shiftbuf.b3;
shiftbuf.b3 = shiftbuf.b4;
shiftbuf.b4 = RXBUF0;
if(shiftbuf.i1 == 0xAAD3 && shiftbuf.b3 == 0x91) {
/* 0 AA D3 91 00 | FF 00 | */
syncbs = 0;
cc1020_rxbuf[cc1020_rxlen++] = shiftbuf.b4;
} else if(shiftbuf.i1 == 0x5569 && shiftbuf.i2 == 0xC880) {
/* 1 55 69 C8 80 | 7F 80 | */
syncbs = -1;
} else if(shiftbuf.i1 == 0xAAB4 && shiftbuf.i2 == 0xE440) {
/* 2 AA B4 E4 40 | 3F C0 | */
syncbs = -2;
} else if(shiftbuf.i1 == 0x555A && shiftbuf.i2 == 0x7220) {
/* 3 55 5A 72 20 | 1F E0 | */
syncbs = -3;
} else if(shiftbuf.i1 == 0xAAAD && shiftbuf.i2 == 0x3910) {
/* 4 AA AD 39 10 | 0F F0 | */
syncbs = -4;
} else if(shiftbuf.i1 == 0x5556 && shiftbuf.i2 == 0x9C88) {
/* 5 55 56 9C 88 | 07 F8 | */
syncbs = +3;
} else if(shiftbuf.i1 == 0xAAAB && shiftbuf.i2 == 0x4E44) {
/* 6 AA AB 4E 44 | 03 FC | */
syncbs = +2;
} else if(shiftbuf.i1 == 0x5555 && shiftbuf.i2 == 0xA722) {
/* 7 55 55 A7 22 | 01 FE | */
syncbs = +1;
} else {
return;
}
rssi = cc1020_get_rssi();
CC1020_SET_OPSTATE(CC1020_RX | CC1020_RX_RECEIVING);
} else if(cc1020_state & CC1020_RX_RECEIVING) {
if(syncbs == 0) {
cc1020_rxbuf[cc1020_rxlen] = RXBUF0;
} else {
shiftbuf.b3 = shiftbuf.b4;
shiftbuf.b4 = RXBUF0;
if(syncbs < 0) {
shiftbuf.i1 = shiftbuf.i2 << -syncbs;
cc1020_rxbuf[cc1020_rxlen] = shiftbuf.b1;
} else {
shiftbuf.i1 = shiftbuf.i2 >> syncbs;
cc1020_rxbuf[cc1020_rxlen] = shiftbuf.b2;
}
}
cc1020_rxlen++;
if(cc1020_rxlen == HDR_SIZE) {
pktlen = ((struct cc1020_header *)cc1020_rxbuf)->length;
if(pktlen == 0 || pktlen > sizeof (cc1020_rxbuf)) {
cc1020_rxlen = 0;
CC1020_SET_OPSTATE(CC1020_RX | CC1020_RX_SEARCHING);
}
} else if(cc1020_rxlen > HDR_SIZE) {
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);
while((cc1020_read_reg(CC1020_STATUS) & CAL_COMPLETE) == 0);
/* 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 and 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);
}
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