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/*
/ _____) _ | |
( (____ _____ ____ _| |_ _____ ____| |__
\____ \| ___ | (_ _) ___ |/ ___) _ \
_____) ) ____| | | || |_| ____( (___| | | |
(______/|_____)_|_|_| \__)_____)\____)_| |_|
(C)2013 Semtech-Cycleo
Description:
Listen Before Talk basic test application
License: Revised BSD License, see LICENSE.TXT file include in the project
Maintainer: Michael Coracin
*/
/* -------------------------------------------------------------------------- */
/* --- DEPENDANCIES --------------------------------------------------------- */
/* fix an issue between POSIX and C99 */
#if __STDC_VERSION__ >= 199901L
#define _XOPEN_SOURCE 600
#else
#define _XOPEN_SOURCE 500
#endif
#include <stdint.h> /* C99 types */
#include <stdbool.h> /* bool type */
#include <stdio.h> /* printf fprintf sprintf fopen fputs */
#include <signal.h> /* sigaction */
#include <unistd.h> /* getopt access */
#include <stdlib.h> /* rand */
#include <string.h> /* strncmp */
#include <getopt.h> /* getopt_long */
#include "loragw_aux.h"
#include "loragw_reg.h"
#include "loragw_hal.h"
#include "loragw_radio.h"
#include "loragw_fpga.h"
#include "loragw_spi.h"
/* -------------------------------------------------------------------------- */
/* --- PRIVATE MACROS & CONSTANTS ------------------------------------------- */
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#define MSG(args...) fprintf(stderr, args) /* message that is destined to the user */
#define DEFAULT_SX127X_RSSI_OFFSET -1
/* -------------------------------------------------------------------------- */
/* --- PRIVATE VARIABLES (GLOBAL) ------------------------------------------- */
/* signal handling variables */
struct sigaction sigact; /* SIGQUIT&SIGINT&SIGTERM signal handling */
static int exit_sig = 0; /* 1 -> application terminates cleanly (shut down hardware, close open files, etc) */
static int quit_sig = 0; /* 1 -> application terminates without shutting down the hardware */
/* -------------------------------------------------------------------------- */
/* --- PRIVATE FUNCTIONS DECLARATION ---------------------------------------- */
static void sig_handler(int sigio);
void usage (void);
/* -------------------------------------------------------------------------- */
/* --- PRIVATE FUNCTIONS DEFINITION ----------------------------------------- */
static void sig_handler(int sigio) {
if (sigio == SIGQUIT) {
quit_sig = 1;;
} else if ((sigio == SIGINT) || (sigio == SIGTERM)) {
exit_sig = 1;
}
}
/* describe command line options */
void usage(void) {
printf("Available options:\n");
printf(" -h print this help\n");
printf(" -f <float> frequency in MHz of the first LBT channel\n");
printf(" -o <int> offset in dB to be applied to the SX127x RSSI [-128..127]\n");
printf(" -r <int> target RSSI: signal strength target used to detect if the channel is clear or not [-128..0]\n");
printf(" -s <uint> scan time in µs for all 8 LBT channels [128,5000]\n");
printf(" --path <string> path of SPIDEV e.g. /dev/spidev0.0\n");
}
/* -------------------------------------------------------------------------- */
/* --- MAIN FUNCTION -------------------------------------------------------- */
int main(int argc, char **argv)
{
int i;
int xi = 0;
int option_index = 0;
static struct option long_options[] = {
{"path", 1, 0, 0},
{0, 0, 0, 0}
};
char arg_s[64];
/* in/out variables */
double f1 = 0.0;
uint32_t f_init = 0; /* in Hz */
uint32_t f_start = 0; /* in Hz */
uint16_t loop_cnt = 0;
int8_t rssi_target_dBm = -80;
uint16_t scan_time_us = 128;
uint32_t timestamp;
uint8_t rssi_value;
int8_t rssi_offset = DEFAULT_SX127X_RSSI_OFFSET;
int32_t val, val2;
int channel;
uint32_t freq_offset;
/* parse command line options */
while ((i = getopt_long (argc, argv, "h:f:s:r:o:", long_options, &option_index)) != -1) {
switch (i) {
case 'h':
usage();
return EXIT_FAILURE;
break;
case 'f':
i = sscanf(optarg, "%lf", &f1);
if ((i != 1) || (f1 < 30.0) || (f1 > 3000.0)) {
MSG("ERROR: Invalid LBT start frequency\n");
usage();
return EXIT_FAILURE;
} else {
f_start = (uint32_t)((f1*1e6) + 0.5);/* .5 Hz offset to get rounding instead of truncating */
}
break;
case 's':
i = sscanf(optarg, "%i", &xi);
if ((i != 1) || ((xi != 128) && (xi != 5000))) {
MSG("ERROR: scan_time_us must be 128 or 5000 \n");
usage();
return EXIT_FAILURE;
} else {
scan_time_us = xi;
}
break;
case 'r':
i = sscanf(optarg, "%i", &xi);
if ((i != 1) || ((xi < -128) && (xi > 0))) {
MSG("ERROR: rssi_target must be b/w -128 & 0 \n");
usage();
return EXIT_FAILURE;
} else {
rssi_target_dBm = xi;
}
break;
case 'o': /* -o <int> SX127x RSSI offset [-128..127] */
i = sscanf(optarg, "%i", &xi);
if((i != 1) || (xi < -128) || (xi > 127)) {
MSG("ERROR: rssi_offset must be b/w -128 & 127\n");
usage();
return EXIT_FAILURE;
} else {
rssi_offset = (int8_t)xi;
}
break;
case 0:
if (strcmp(long_options[option_index].name,"path") == 0) {
i = sscanf(optarg, "%s", arg_s);
if ((i != 1) || (strncmp(arg_s, "/dev/", 5 ) != 0)) {
printf("ERROR: argument parsing of --path argument. Use -h to print help\n");
return EXIT_FAILURE;
}
else {
lgw_spi_set_path(arg_s);
}
} else {
printf("ERROR: argument parsing options. Use -h to print help\n");
return EXIT_FAILURE;
}
break;
default:
MSG("ERROR: argument parsing use -h option for help\n");
usage();
return EXIT_FAILURE;
}
}
MSG("INFO: Starting LoRa Gateway v1.5 LBT test\n");
/* configure signal handling */
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = 0;
sigact.sa_handler = sig_handler;
sigaction(SIGQUIT, &sigact, NULL);
sigaction(SIGINT, &sigact, NULL);
sigaction(SIGTERM, &sigact, NULL);
/* Connect to concentrator */
i = lgw_connect(false, LGW_DEFAULT_NOTCH_FREQ);
if (i != LGW_REG_SUCCESS) {
MSG("ERROR: lgw_connect() did not return SUCCESS\n");
return EXIT_FAILURE;
}
/* Check if FPGA supports LBT */
lgw_fpga_reg_r(LGW_FPGA_FEATURE, &val);
if (TAKE_N_BITS_FROM((uint8_t)val, 2, 1) != true) {
MSG("ERROR: LBT is not supported (0x%x)\n", (uint8_t)val);
return EXIT_FAILURE;
}
/* Get FPGA lowest frequency for LBT channels */
lgw_fpga_reg_r(LGW_FPGA_LBT_INITIAL_FREQ, &val);
switch (val) {
case 0:
f_init = 915000000;
break;
case 1:
f_init = 863000000;
break;
default:
MSG("ERROR: LBT start frequency %d is not supported\n", val);
return EXIT_FAILURE;
}
/* Initialize 1st LBT channel freq if not given by user */
if (f_start == 0) {
f_start = f_init;
} else if (f_start < f_init) {
MSG("ERROR: LBT start frequency %u is not supported (f_init=%u)\n", f_start, f_init);
return EXIT_FAILURE;
}
MSG("FREQ: %u\n", f_start);
/* Configure SX127x and read few RSSI points */
lgw_setup_sx127x(f_init, MOD_FSK, LGW_SX127X_RXBW_100K_HZ, rssi_offset); /* 200KHz LBT channels */
for (i = 0; i < 100; i++) {
lgw_sx127x_reg_r(0x11, &rssi_value); /* 0x11: RegRssiValue */
MSG("SX127x RSSI:%i dBm\n", -(rssi_value/2));
wait_ms(10);
}
/* Configure LBT */
val = -2*(rssi_target_dBm);
lgw_fpga_reg_w(LGW_FPGA_RSSI_TARGET, val);
for (i = 0; i < LBT_CHANNEL_FREQ_NB; i++) {
freq_offset = (f_start - f_init)/100E3 + i*2; /* 200KHz between each channel */
lgw_fpga_reg_w(LGW_FPGA_LBT_CH0_FREQ_OFFSET+i, (int32_t)freq_offset);
if (scan_time_us == 5000) { /* configured to 128 by default */
lgw_fpga_reg_w(LGW_FPGA_LBT_SCAN_TIME_CH0+i, 1);
}
}
lgw_fpga_reg_r(LGW_FPGA_RSSI_TARGET, &val);
MSG("RSSI_TARGET = %d\n", val);
if (val != (-2*rssi_target_dBm)) {
MSG("ERROR: failed to read back RSSI target register value\n");
return EXIT_FAILURE;
}
for (i = 0; i < LBT_CHANNEL_FREQ_NB; i++) {
lgw_fpga_reg_r(LGW_FPGA_LBT_CH0_FREQ_OFFSET+i, &val);
lgw_fpga_reg_r(LGW_FPGA_LBT_SCAN_TIME_CH0+i, &val2);
MSG("CH_%i: freq=%u (offset=%i), scan_time=%u (%i)\n", i, (uint32_t)((val*100E3)+f_init), val, (val2==1)?5000:128, val2);
}
lgw_fpga_reg_r(LGW_FPGA_VERSION, &val);
MSG("FPGA VERSION = %d\n", val);
/* Enable LBT FSM */
lgw_fpga_reg_w(LGW_FPGA_CTRL_FEATURE_START, 1);
/* Start test */
while ((quit_sig != 1) && (exit_sig != 1)) {
MSG("~~~~\n");
for (channel = 0; channel < LBT_CHANNEL_FREQ_NB; channel++) {
/* Select LBT channel */
lgw_fpga_reg_w(LGW_FPGA_LBT_TIMESTAMP_SELECT_CH, channel);
/* Get last instant when the selected channel was free */
lgw_fpga_reg_r(LGW_FPGA_LBT_TIMESTAMP_CH, &val);
timestamp = (uint32_t)(val & 0x0000FFFF) * 256; /* 16bits (1LSB = 256µs) */
MSG(" TIMESTAMP_CH%u = %u\n", channel, timestamp);
}
loop_cnt += 1;
wait_ms(400);
}
/* close SPI link */
i = lgw_disconnect();
if (i != LGW_REG_SUCCESS) {
MSG("ERROR: lgw_disconnect() did not return SUCCESS\n");
return EXIT_FAILURE;
}
MSG("INFO: Exiting LoRa Gateway v1.5 LBT test successfully\n");
return EXIT_SUCCESS;
}
/* --- EOF ------------------------------------------------------------------ */
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