osd-contiki/cpu/cc253x/dev/cc2530-rf.c
2012-07-11 10:53:14 +01:00

498 lines
13 KiB
C

/*
* Copyright (c) 2011, George Oikonomou - <oikonomou@users.sourceforge.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the Institute 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 THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE 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 file is part of the Contiki operating system.
*/
/**
* \file
* Implementation of the cc2530 RF driver
*
* \author
* George Oikonomou - <oikonomou@users.sourceforge.net>
*/
#include "contiki.h"
#include "dev/radio.h"
#include "dev/cc2530-rf.h"
#include "cc253x.h"
#include "sfr-bits.h"
#include "sys/clock.h"
#include "sys/rtimer.h"
#include "net/packetbuf.h"
#include "net/rime/rimestats.h"
#include "net/rime/rimeaddr.h"
#include "net/netstack.h"
#include <string.h>
/*---------------------------------------------------------------------------*/
#define CHECKSUM_LEN 2
/*---------------------------------------------------------------------------*/
#if CC2530_RF_CONF_LEDS
#define CC2530_RF_LEDS CC2530_RF_CONF_LEDS
#else
#define CC2530_RF_LEDS 0
#endif
#if CC2530_RF_LEDS
#include "dev/leds.h"
#define RF_RX_LED_ON() leds_on(LEDS_RED);
#define RF_RX_LED_OFF() leds_off(LEDS_RED);
#define RF_TX_LED_ON() leds_on(LEDS_GREEN);
#define RF_TX_LED_OFF() leds_off(LEDS_GREEN);
#else
#define RF_RX_LED_ON()
#define RF_RX_LED_OFF()
#define RF_TX_LED_ON()
#define RF_TX_LED_OFF()
#endif
/*---------------------------------------------------------------------------*/
#define DEBUG 0
#if DEBUG
#include "debug.h"
#define PUTSTRING(...) putstring(__VA_ARGS__)
#define PUTHEX(...) puthex(__VA_ARGS__)
#else
#define PUTSTRING(...)
#define PUTHEX(...)
#endif
/*---------------------------------------------------------------------------*/
/* Local RF Flags */
#define RX_ACTIVE 0x80
#define WAS_OFF 0x10
#define RF_ON 0x01
/* Bit Masks for the last byte in the RX FIFO */
#define CRC_BIT_MASK 0x80
#define LQI_BIT_MASK 0x7F
/* RSSI Offset */
#define RSSI_OFFSET 73
/* 192 ms, radio off -> on interval */
#define ONOFF_TIME RTIMER_ARCH_SECOND / 3125
/*---------------------------------------------------------------------------*/
#if CC2530_RF_CONF_HEXDUMP
#include "uart0.h"
static const uint8_t magic[] = { 0x53, 0x6E, 0x69, 0x66 }; /* Snif */
#endif
/*---------------------------------------------------------------------------*/
#ifdef CC2530_RF_CONF_AUTOACK
#define CC2530_RF_AUTOACK CC2530_RF_CONF_AUTOACK
#else
#define CC2530_RF_AUTOACK 1
#endif
/*---------------------------------------------------------------------------*/
static uint8_t __data rf_flags;
static int on(void); /* prepare() needs our prototype */
static int off(void); /* transmit() needs our prototype */
static int channel_clear(void); /* transmit() needs our prototype */
/*---------------------------------------------------------------------------*/
int8_t
cc2530_rf_channel_set(uint8_t channel)
{
PUTSTRING("RF: Set Chan\n");
if((channel < CC2530_RF_CHANNEL_MIN) || (channel > CC2530_RF_CHANNEL_MAX)) {
return -1;
}
/* Changes to FREQCTRL take effect after the next recalibration */
off();
FREQCTRL = (CC2530_RF_CHANNEL_MIN
+ (channel - CC2530_RF_CHANNEL_MIN) * CC2530_RF_CHANNEL_SPACING);
on();
return (int8_t) channel;
}
/*---------------------------------------------------------------------------*/
uint8_t
cc2530_rf_power_set(uint8_t new_power)
{
PUTSTRING("RF: Set Power\n");
/* off() */
TXPOWER = new_power;
/* on() */
return TXPOWER;
}
/*---------------------------------------------------------------------------*/
void
cc2530_rf_set_addr(uint16_t pan)
{
#if RIMEADDR_SIZE==8 /* EXT_ADDR[7:0] is ignored when using short addresses */
int i;
for(i = (RIMEADDR_SIZE - 1); i >= 0; --i) {
((uint8_t *)&EXT_ADDR0)[i] = rimeaddr_node_addr.u8[RIMEADDR_SIZE - 1 - i];
}
#endif
PAN_ID0 = pan & 0xFF;
PAN_ID1 = pan >> 8;
SHORT_ADDR0 = rimeaddr_node_addr.u8[RIMEADDR_SIZE - 1];
SHORT_ADDR1 = rimeaddr_node_addr.u8[RIMEADDR_SIZE - 2];
}
/*---------------------------------------------------------------------------*/
/* Netstack API radio driver functions */
/*---------------------------------------------------------------------------*/
static int
init(void)
{
PUTSTRING("RF: Init\n");
if(rf_flags & RF_ON) {
return 0;
}
#if CC2530_RF_LOW_POWER_RX
/* Reduce RX power consumption current to 20mA at the cost of sensitivity */
RXCTRL = 0x00;
FSCTRL = 0x50;
#else
RXCTRL = 0x3F;
FSCTRL = 0x55;
#endif /* CC2530_RF_LOW_POWER_RX */
CCACTRL0 = CC2530_RF_CCA_THRES;
/*
* According to the user guide, these registers must be updated from their
* defaults for optimal performance
*
* Table 23-6, Sec. 23.15.1, p. 259
*/
TXFILTCFG = 0x09; /* TX anti-aliasing filter */
AGCCTRL1 = 0x15; /* AGC target value */
FSCAL1 = 0x00; /* Reduce the VCO leakage */
/* Auto ACKs and CRC calculation, default RX and TX modes with FIFOs */
FRMCTRL0 = FRMCTRL0_AUTOCRC;
#if CC2530_RF_AUTOACK
FRMCTRL0 |= FRMCTRL0_AUTOACK;
#endif
/* Disable source address matching and autopend */
SRCMATCH = 0; /* investigate */
/* MAX FIFOP threshold */
FIFOPCTRL = CC2530_RF_MAX_PACKET_LEN;
cc2530_rf_power_set(CC2530_RF_TX_POWER);
cc2530_rf_channel_set(CC2530_RF_CHANNEL);
RF_TX_LED_OFF();
RF_RX_LED_OFF();
rf_flags |= RF_ON;
return 1;
}
/*---------------------------------------------------------------------------*/
static int
prepare(const void *payload, unsigned short payload_len)
{
uint8_t i;
PUTSTRING("RF: Prepare 0x");
PUTHEX(payload_len + CHECKSUM_LEN);
PUTSTRING(" bytes\n");
/*
* When we transmit in very quick bursts, make sure previous transmission
* is not still in progress before re-writing to the TX FIFO
*/
while(FSMSTAT1 & FSMSTAT1_TX_ACTIVE);
if((rf_flags & RX_ACTIVE) == 0) {
on();
}
CC2530_CSP_ISFLUSHTX();
PUTSTRING("RF: data = ");
/* Send the phy length byte first */
RFD = payload_len + CHECKSUM_LEN; /* Payload plus FCS */
for(i = 0; i < payload_len; i++) {
RFD = ((unsigned char*) (payload))[i];
PUTHEX(((unsigned char*)(payload))[i]);
}
PUTSTRING("\n");
/* Leave space for the FCS */
RFD = 0;
RFD = 0;
return 0;
}
/*---------------------------------------------------------------------------*/
static int
transmit(unsigned short transmit_len)
{
uint8_t counter;
int ret = RADIO_TX_ERR;
rtimer_clock_t t0;
transmit_len; /* hush the warning */
if(!(rf_flags & RX_ACTIVE)) {
t0 = RTIMER_NOW();
on();
rf_flags |= WAS_OFF;
while (RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + ONOFF_TIME));
}
if(channel_clear() == CC2530_RF_CCA_BUSY) {
RIMESTATS_ADD(contentiondrop);
return RADIO_TX_COLLISION;
}
/*
* prepare() double checked that TX_ACTIVE is low. If SFD is high we are
* receiving. Abort transmission and bail out with RADIO_TX_COLLISION
*/
if(FSMSTAT1 & FSMSTAT1_SFD) {
RIMESTATS_ADD(contentiondrop);
return RADIO_TX_COLLISION;
}
/* Start the transmission */
RF_TX_LED_ON();
ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
ENERGEST_ON(ENERGEST_TYPE_TRANSMIT);
CC2530_CSP_ISTXON();
counter = 0;
while(!(FSMSTAT1 & FSMSTAT1_TX_ACTIVE) && (counter++ < 3)) {
clock_delay_usec(6);
}
if(!(FSMSTAT1 & FSMSTAT1_TX_ACTIVE)) {
PUTSTRING("RF: TX never active.\n");
CC2530_CSP_ISFLUSHTX();
ret = RADIO_TX_ERR;
} else {
/* Wait for the transmission to finish */
while(FSMSTAT1 & FSMSTAT1_TX_ACTIVE);
ret = RADIO_TX_OK;
}
ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT);
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
if(rf_flags & WAS_OFF){
off();
}
RIMESTATS_ADD(lltx);
RF_TX_LED_OFF();
/* OK, sent. We are now ready to send more */
return ret;
}
/*---------------------------------------------------------------------------*/
static int
send(void *payload, unsigned short payload_len)
{
prepare(payload, payload_len);
return transmit(payload_len);
}
/*---------------------------------------------------------------------------*/
static int
read(void *buf, unsigned short bufsize)
{
uint8_t i;
uint8_t len;
uint8_t crc_corr;
int8_t rssi;
PUTSTRING("RF: Read\n");
/* Check the length */
len = RFD;
/* Check for validity */
if(len > CC2530_RF_MAX_PACKET_LEN) {
/* Oops, we must be out of sync. */
PUTSTRING("RF: bad sync\n");
RIMESTATS_ADD(badsynch);
CC2530_CSP_ISFLUSHRX();
return 0;
}
if(len <= CC2530_RF_MIN_PACKET_LEN) {
PUTSTRING("RF: too short\n");
RIMESTATS_ADD(tooshort);
CC2530_CSP_ISFLUSHRX();
return 0;
}
if(len - CHECKSUM_LEN > bufsize) {
PUTSTRING("RF: too long\n");
RIMESTATS_ADD(toolong);
CC2530_CSP_ISFLUSHRX();
return 0;
}
#if CC2530_RF_CONF_HEXDUMP
/* If we reach here, chances are the FIFO is holding a valid frame */
uart0_writeb(magic[0]);
uart0_writeb(magic[1]);
uart0_writeb(magic[2]);
uart0_writeb(magic[3]);
uart0_writeb(len);
#endif
RF_RX_LED_ON();
PUTSTRING("RF: read (0x");
PUTHEX(len);
PUTSTRING(" bytes) = ");
len -= CHECKSUM_LEN;
for(i = 0; i < len; ++i) {
((unsigned char*)(buf))[i] = RFD;
#if CC2530_RF_CONF_HEXDUMP
uart0_writeb(((unsigned char*)(buf))[i]);
#endif
PUTHEX(((unsigned char*)(buf))[i]);
}
PUTSTRING("\n");
/* Read the RSSI and CRC/Corr bytes */
rssi = ((int8_t) RFD) - RSSI_OFFSET;
crc_corr = RFD;
#if CC2530_RF_CONF_HEXDUMP
uart0_writeb(rssi);
uart0_writeb(crc_corr);
#endif
/* MS bit CRC OK/Not OK, 7 LS Bits, Correlation value */
if(crc_corr & CRC_BIT_MASK) {
packetbuf_set_attr(PACKETBUF_ATTR_RSSI, rssi);
packetbuf_set_attr(PACKETBUF_ATTR_LINK_QUALITY, crc_corr & LQI_BIT_MASK);
RIMESTATS_ADD(llrx);
} else {
RIMESTATS_ADD(badcrc);
CC2530_CSP_ISFLUSHRX();
RF_RX_LED_OFF();
return 0;
}
/* If FIFOP==1 and FIFO==0 then we had a FIFO overflow at some point. */
if((FSMSTAT1 & (FSMSTAT1_FIFO | FSMSTAT1_FIFOP)) == FSMSTAT1_FIFOP) {
/*
* If we reach here means that there might be more intact packets in the
* FIFO despite the overflow. This can happen with bursts of small packets.
*
* Only flush if the FIFO is actually empty. If not, then next pass we will
* pick up one more packet or flush due to an error.
*/
if(!RXFIFOCNT) {
CC2530_CSP_ISFLUSHRX();
}
}
RF_RX_LED_OFF();
return (len);
}
/*---------------------------------------------------------------------------*/
static int
channel_clear(void)
{
if(FSMSTAT1 & FSMSTAT1_CCA) {
return CC2530_RF_CCA_CLEAR;
}
return CC2530_RF_CCA_BUSY;
}
/*---------------------------------------------------------------------------*/
static int
receiving_packet(void)
{
PUTSTRING("RF: Receiving\n");
/*
* SFD high while transmitting and receiving.
* TX_ACTIVE high only when transmitting
*
* FSMSTAT1 & (TX_ACTIVE | SFD) == SFD <=> receiving
*/
return (FSMSTAT1 & (FSMSTAT1_TX_ACTIVE | FSMSTAT1_SFD) == FSMSTAT1_SFD);
}
/*---------------------------------------------------------------------------*/
static int
pending_packet(void)
{
return (FSMSTAT1 & FSMSTAT1_FIFOP);
}
/*---------------------------------------------------------------------------*/
static int
on(void)
{
if(!(rf_flags & RX_ACTIVE)) {
CC2530_CSP_ISFLUSHRX();
CC2530_CSP_ISRXON();
rf_flags |= RX_ACTIVE;
}
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
return 1;
}
/*---------------------------------------------------------------------------*/
static int
off(void)
{
CC2530_CSP_ISRFOFF();
CC2530_CSP_ISFLUSHRX();
rf_flags &= ~RX_ACTIVE;
ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
return 1;
}
/*---------------------------------------------------------------------------*/
const struct radio_driver cc2530_rf_driver =
{
init,
prepare,
transmit,
send,
read,
channel_clear,
receiving_packet,
pending_packet,
on,
off,
};
/*---------------------------------------------------------------------------*/