static char get_choice()
{
fputs("Please Enter YOU CHOICE : ", stdout);
char c = getchar();
read_flush();
return c;
}
int gps_autonegotiate_baud(gps_t *g, int guessbaud)
{
int bauds[] = { 4800, 9600, 19200, 38400, 600, 1200, 2400, -1 };
int baudidx = -1;
uint8_t rpy[GPS_MESSAGE_MAXLEN + 1];
rpy[GPS_MESSAGE_MAXLEN] = 0;
while (1) {
int baud;
if (baudidx < 0)
baud = guessbaud;
else {
if (bauds[baudidx] < 0)
baudidx = 0;
baud = bauds[baudidx];
}
printf("Trying %6d baud...", baud);
fflush(NULL);
// enable all output sentences
gps_write_command(g, "$PGRMO,,3*");
serial_setbaud(g->fd, baud);
read_flush(g->fd);
for (int i = 0; i < 4; i++) {
int res = gps_readline(g, rpy, GPS_MESSAGE_MAXLEN);
if (!res) {
printf("GPS found!\n");
return 0;
}
printf(".");
fflush(NULL);
}
printf("\n");
baudidx++;
}
// no luck
return -1;
}
static void get_str(char *prompts, char *result)
{
fputs(prompts, stdout);
fscanf(stdin, "%s", result);
read_flush();
}
