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Exercise 9 now acquires satellites, more to do for this exercise, e.g. logging and RTC time setting

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This commit is contained in:
John Poole 2026-02-17 11:12:31 -08:00
commit 21825c09c6
3 changed files with 73 additions and 14 deletions
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76
exercises/09_GPS_Time/src/main.cpp
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@ -40,6 +40,7 @@ static HardwareSerial g_gpsSerial(1);
static uint32_t g_logSeq = 0;
static uint32_t g_lastMinuteReportMs = 0;
static uint32_t g_gpsBaud = GPS_BAUD;
static bool g_prevHadSatellites = false;
static bool g_prevHadValidUtc = false;
@ -328,6 +329,59 @@ static void pollGpsSerial() {
}
}
static void startGpsUart(uint32_t baud) {
g_gpsSerial.end();
delay(20);
g_gpsSerial.setRxBufferSize(1024);
g_gpsSerial.begin(baud, SERIAL_8N1, GPS_RX_PIN, GPS_TX_PIN);
g_gpsBaud = baud;
}
static bool collectGpsTraffic(uint32_t windowMs, bool updateSd) {
uint32_t start = millis();
size_t bytesSeen = 0;
while ((uint32_t)(millis() - start) < windowMs) {
while (g_gpsSerial.available() > 0) {
(void)g_gpsSerial.read();
bytesSeen++;
}
pollGpsSerial();
if (updateSd) {
g_sd.update();
}
delay(2);
}
return bytesSeen > 0 || g_gps.sawAnySentence;
}
static bool probeGpsAtBaud(uint32_t baud) {
startGpsUart(baud);
logf("Probing GPS at %lu baud...", (unsigned long)baud);
if (collectGpsTraffic(700, true)) {
return true;
}
// Common commands for MTK/L76K and related chipsets.
g_gpsSerial.write("$PCAS06,0*1B\r\n");
g_gpsSerial.write("$PMTK605*31\r\n");
g_gpsSerial.write("$PQTMVERNO*58\r\n");
g_gpsSerial.write("$PMTK353,1,1,1,1,1*2A\r\n");
g_gpsSerial.write("$PMTK314,0,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29\r\n");
return collectGpsTraffic(1200, true);
}
static void initialGpsProbe() {
const uint32_t bauds[] = {GPS_BAUD, 115200, 38400, 57600, 19200};
for (size_t i = 0; i < sizeof(bauds) / sizeof(bauds[0]); ++i) {
if (probeGpsAtBaud(bauds[i])) {
logf("GPS traffic detected at %lu baud", (unsigned long)g_gpsBaud);
return;
}
}
logf("No GPS traffic detected during startup probe");
}
static uint8_t bestSatelliteCount() {
return (g_gps.satsUsed > g_gps.satsInView) ? g_gps.satsUsed : g_gps.satsInView;
}
@ -448,25 +502,17 @@ void setup() {
}
#ifdef GPS_WAKEUP_PIN
pinMode(GPS_WAKEUP_PIN, OUTPUT);
digitalWrite(GPS_WAKEUP_PIN, HIGH);
// Keep wake pin neutral; avoid forcing an unknown standby state.
pinMode(GPS_WAKEUP_PIN, INPUT);
#endif
#ifdef GPS_1PPS_PIN
pinMode(GPS_1PPS_PIN, INPUT);
#endif
#ifdef GPS_RX_PIN
#ifdef GPS_TX_PIN
g_gpsSerial.begin(GPS_BAUD, SERIAL_8N1, GPS_RX_PIN, GPS_TX_PIN);
#else
g_gpsSerial.begin(GPS_BAUD);
#endif
#else
g_gpsSerial.begin(GPS_BAUD);
#endif
logf("GPS UART started at %u baud", (unsigned)GPS_BAUD);
startGpsUart(GPS_BAUD);
logf("GPS UART started: RX=%d TX=%d baud=%lu", GPS_RX_PIN, GPS_TX_PIN, (unsigned long)g_gpsBaud);
initialGpsProbe();
oledShowLines("GPS startup probe", "Checking satellites", "and GPS time...");
@ -481,9 +527,11 @@ void setup() {
lastProbeUiMs = now;
char l3[28];
char l4[30];
char l5[24];
snprintf(l3, sizeof(l3), "Sats: %u", (unsigned)bestSatelliteCount());
snprintf(l4, sizeof(l4), "Module: %s", gpsModuleToString(g_gps.module).c_str());
oledShowLines("GPS startup probe", "Checking satellites", l3, l4);
snprintf(l5, sizeof(l5), "NMEA:%s %lu", g_gps.sawAnySentence ? "yes" : "no", (unsigned long)g_gpsBaud);
oledShowLines("GPS startup probe", "Checking satellites", l3, l4, l5);
}
delay(10);
}