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CC1200: add SFD timestamping and RSSI features

This commit is contained in:
Simon Duquennoy 2018-10-03 13:28:50 +02:00
parent e6dec9ee4a
commit a09fb40bf7
1 changed files with 72 additions and 1 deletions
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73
arch/dev/cc1200/cc1200.c
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@ -47,6 +47,9 @@
#include <string.h>
#include <stdio.h>
static int16_t rssi;
static rtimer_clock_t sfd_timestamp = 0;
/*---------------------------------------------------------------------------*/
/* Various implementation specific defines */
/*---------------------------------------------------------------------------*/
@ -249,6 +252,8 @@ extern const cc1200_rf_cfg_t CC1200_RF_CFG;
#define RF_UPDATE_CHANNEL 0x10
/* SPI was locked when calling RX interrupt, let the pollhandler do the job */
#define RF_POLL_RX_INTERRUPT 0x20
/* Ongoing reception */
#define RF_RX_ONGOING 0x40
/* Force calibration in case we don't use CC1200 AUTOCAL + timeout */
#if !CC1200_AUTOCAL
#if CC1200_CAL_TIMEOUT_SECONDS
@ -861,7 +866,7 @@ read(void *buf, unsigned short buf_len)
if(rx_pkt_len > 0) {
int8_t rssi = rx_pkt[rx_pkt_len - 2];
rssi = (int8_t)rx_pkt[rx_pkt_len - 2] + (int)CC1200_RF_CFG.rssi_offset;
/* CRC is already checked */
uint8_t crc_lqi = rx_pkt[rx_pkt_len - 1];
@ -1106,6 +1111,40 @@ off(void)
}
/*---------------------------------------------------------------------------*/
/**
* \brief Reads the current signal strength (RSSI)
* \return The current RSSI in dBm
*
* This function reads the current RSSI on the currently configured
* channel.
*/
static int16_t
get_rssi(void)
{
int16_t rssi0, rssi1;
uint8_t was_off = 0;
/* If we are off, turn on first */
if(!(rf_flags & RF_ON)) {
was_off = 1;
on();
}
/* Wait for CARRIER_SENSE_VALID signal */
BUSYWAIT_UNTIL(((rssi0 = single_read(CC1200_RSSI0))
& CC1200_CARRIER_SENSE_VALID),
RTIMER_SECOND / 100);
RF_ASSERT(rssi0 & CC1200_CARRIER_SENSE_VALID);
rssi1 = (int8_t)single_read(CC1200_RSSI1) + (int)CC1200_RF_CFG.rssi_offset;
/* If we were off, turn back off */
if(was_off) {
off();
}
return rssi1;
}
/*---------------------------------------------------------------------------*/
/* Get a radio parameter value. */
static radio_result_t
get_value(radio_param_t param, radio_value_t *value)
@ -1156,6 +1195,13 @@ get_value(radio_param_t param, radio_value_t *value)
return RADIO_RESULT_OK;
case RADIO_PARAM_RSSI:
*value = get_rssi();
return RADIO_RESULT_OK;
case RADIO_PARAM_LAST_RSSI:
*value = (radio_value_t)rssi;
return RADIO_RESULT_OK;
case RADIO_PARAM_64BIT_ADDR:
return RADIO_RESULT_NOT_SUPPORTED;
@ -1310,6 +1356,14 @@ set_value(radio_param_t param, radio_value_t value)
static radio_result_t
get_object(radio_param_t param, void *dest, size_t size)
{
if(param == RADIO_PARAM_LAST_PACKET_TIMESTAMP) {
if(size != sizeof(rtimer_clock_t) || !dest) {
return RADIO_RESULT_INVALID_VALUE;
}
*(rtimer_clock_t *)dest = sfd_timestamp;
return RADIO_RESULT_OK;
}
if(param == RADIO_CONST_TSCH_TIMING) {
if(size != sizeof(uint16_t *) || !dest) {
return RADIO_RESULT_INVALID_VALUE;
@ -2239,6 +2293,23 @@ cc1200_rx_interrupt(void)
*/
static uint8_t buf[CC1200_MAX_PAYLOAD_LEN + APPENDIX_LEN];
/*
* If CC1200_USE_GPIO2 is enabled, we come here either once RX FIFO
* threshold is reached (GPIO2 rising edge)
* or at the end of the packet (GPIO0 falling edge).
*/
#if CC1200_USE_GPIO2
int gpio2 = cc1200_arch_gpio2_read_pin();
int gpio0 = cc1200_arch_gpio0_read_pin();
if((rf_flags & RF_RX_ONGOING) == 0 && gpio2 > 0) {
rf_flags |= RF_RX_ONGOING;
sfd_timestamp = RTIMER_NOW();
}
if(gpio0 == 0) {
rf_flags &= ~RF_RX_ONGOING;
}
#endif
if(SPI_IS_LOCKED()) {
/*