Hi there
For test purposes, I first implemented a simple serial reading & parsing function in polling mode of a gps device (sending @ 1 Hz).
void read_gps_tag(void)
{
uint8_t cnt = 0;
char uart_buf[GPS_NMEA_MAX_SIZE]; // Read UART buffer
char c; // Read UART character
ret_code_t ret; // Return value of the nrf_serial_read function
bool reading = true; // Reading flag
char *p_str; // Pointer on the string comparison result
while(reading) {
ret = nrf_serial_read(&gps_uart, &c, sizeof(c), NULL, 1000);
APP_ERROR_CHECK(ret);
uart_buf[cnt++] = c;
if(c == GPS_NMEA_STOP_CHAR) {
if(uart_buf[0] == GPS_NMEA_START_CHAR) {
static char comp[7] = "$GPRMC";
p_str = strstr(uart_buf, comp);
if(p_str != NULL) {
strcpy(cur_tag.raw_tag, uart_buf);
cur_tag.length = strlen(uart_buf);
reading = false;
}
}
cnt = 0;
}
}
}
Everything works fine when I call the function directly from the main(), e.g. like:
int main (void)
{
// ...initializations...
while(true) {
read_gps_tag();
}
}
But when I embed the function in the following code, it keeps stuck on reading
int main(void)
{
// ...initializations...
while (true)
{
if(ui_rec_start_req) {
NRF_LOG_INFO("Start request received");
card_status = sdc_init();
if(card_status == RES_OK) {
NRF_LOG_INFO("SD card init done.");
ff_result = sdc_mount();
if(ff_result == FR_OK) {
NRF_LOG_INFO("SD card mounted.");
read_gps_tag();
}
else {
NRF_LOG_INFO("SD card init failed. Result: %d", ff_result);
ui_sdc_init_cnt++;
}
}
else {
NRF_LOG_INFO("SD card check failed. Status: %d", card_status);
ui_sdc_init_cnt++;
}
if(ui_sdc_init_cnt >= 3) {
ui_rec_start_req = false;
}
}
}
}
For information: the 'ui_rec_start_req' flag is set by interruption when a button is pressed. Everything works basically fine, except 'read_gps_tag' which stays stuck at 'nrf_serial_read(&gps_uart, &c, sizeof(c), NULL, 1000)'. Any idea?
Thanks in advance,
Sébastien
