drivers/gnss/gnss_nmea0183_match.c

/*
 * Copyright (c) 2023 Trackunit Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/drivers/gnss/gnss_publish.h>
#include <zephyr/kernel.h>
#include <zephyr/modem/chat.h>

#include <string.h>

#include "gnss_parse.h"
#include "gnss_nmea0183.h"
#include "gnss_nmea0183_match.h"

static int gnss_nmea0183_match_parse_utc(char **argv, uint16_t argc, uint32_t *utc)
{
	int64_t i64;

	if ((gnss_parse_dec_to_milli(argv[1], &i64) < 0) ||
	    (i64 < 0) ||
	    (i64 > UINT32_MAX)) {
		return -EINVAL;
	}

	*utc = (uint32_t)i64;
	return 0;
}

#if CONFIG_GNSS_SATELLITES
static void gnss_nmea0183_match_reset_gsv(struct gnss_nmea0183_match_data *data)
{
	data->satellites_length = 0;
	data->gsv_message_number = 1;
}
#endif

static void gnss_nmea0183_match_publish(struct gnss_nmea0183_match_data *data)
{
	if ((data->gga_utc == 0) || (data->rmc_utc == 0)) {
		return;
	}

	if (data->gga_utc == data->rmc_utc) {
		gnss_publish_data(data->gnss, &data->data);
	}
}

void gnss_nmea0183_match_gga_callback(struct modem_chat *chat, char **argv, uint16_t argc,
				      void *user_data)
{
	struct gnss_nmea0183_match_data *data = user_data;

	if (gnss_nmea0183_parse_gga((const char **)argv, argc, &data->data) < 0) {
		return;
	}

	if (gnss_nmea0183_match_parse_utc(argv, argc, &data->gga_utc) < 0) {
		return;
	}

	gnss_nmea0183_match_publish(data);
}

void gnss_nmea0183_match_rmc_callback(struct modem_chat *chat, char **argv, uint16_t argc,
				      void *user_data)
{
	struct gnss_nmea0183_match_data *data = user_data;

	if (gnss_nmea0183_parse_rmc((const char **)argv, argc, &data->data) < 0) {
		return;
	}

	if (gnss_nmea0183_match_parse_utc(argv, argc, &data->rmc_utc) < 0) {
		return;
	}

	gnss_nmea0183_match_publish(data);
}

#if CONFIG_GNSS_SATELLITES
void gnss_nmea0183_match_gsv_callback(struct modem_chat *chat, char **argv, uint16_t argc,
				      void *user_data)
{
	struct gnss_nmea0183_match_data *data = user_data;
	struct gnss_nmea0183_gsv_header header;
	int ret;

	if (gnss_nmea0183_parse_gsv_header((const char **)argv, argc, &header) < 0) {
		return;
	}

	if (header.number_of_svs == 0) {
		return;
	}

	if (header.message_number != data->gsv_message_number) {
		gnss_nmea0183_match_reset_gsv(data);
		return;
	}

	data->gsv_message_number++;

	ret = gnss_nmea0183_parse_gsv_svs((const char **)argv, argc,
					  &data->satellites[data->satellites_length],
					  data->satellites_size - data->satellites_length);
	if (ret < 0) {
		gnss_nmea0183_match_reset_gsv(data);
		return;
	}

	data->satellites_length += (uint16_t)ret;

	if (data->satellites_length == header.number_of_svs) {
		gnss_publish_satellites(data->gnss, data->satellites, data->satellites_length);
		gnss_nmea0183_match_reset_gsv(data);
	}
}
#endif

int gnss_nmea0183_match_init(struct gnss_nmea0183_match_data *data,
			     const struct gnss_nmea0183_match_config *config)
{
	__ASSERT(data != NULL, "data argument must be provided");
	__ASSERT(config != NULL, "config argument must be provided");

	memset(data, 0, sizeof(struct gnss_nmea0183_match_data));
	data->gnss = config->gnss;
#if CONFIG_GNSS_SATELLITES
	data->satellites = config->satellites;
	data->satellites_size = config->satellites_size;
#endif
	return 0;
}