fix: idle mode was not always activated

platformio.ini

@@ -15,6 +15,7 @@ framework = arduino
 lib_deps =
     https://github.com/marcoschwartz/LiquidCrystal_I2C
     https://github.com/rocketscream/Low-Power
+build_flags = -DGPSM_UBLOX6
 upload_protocol = custom
 upload_flags =
     -C

src/main.cpp

@@ -529,6 +529,11 @@ void readNmeaRmc() {
       }
     }
     if (nmeaState == 2) {
+#ifdef GPSM_L80R
+      // L80-R: Send GPS module into standby mode
+      Serial.println("$PMTK161,0*28");
+      Serial.flush();
+#endif
       char buf[16];
       char *bptr = buf;
       uint8_t counter = 0;
@@ -642,6 +647,7 @@ void readNmeaRmc() {
 }
 
 void setup() {
+#if defined(GPSM_UBLOX6)
   Serial.begin(9600);
   // ublox NEO-6M: Switch to low-power on-off mode with peak current limiting - not sure if this actually works
   Serial.print("\xb5\x62\x06\x3b\x2c\x00\x01\x06\x00\x00\x0e\x81\x00\x00\x60\xea\x00\x00\x10\x27\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x2c\x01\x00\x00\x4f\xc1\x03\x00\x86\x02\x00\x00\xfe\x00\x00\x00\x64\x40\x01\x00\xf1\xd5");
@@ -653,6 +659,15 @@ void setup() {
   Serial.println("$PUBX,40,VTG,0,0,0,0,0,0*5E");
   Serial.println("$PUBX,40,GGA,0,0,0,0,0,0*5A");
   Serial.flush();
+#elif defined(GPSM_L80R)
+  Serial.begin(9600);
+  // L80-R: Disable all NMEA sentences except for GPRMC
+  Serial.println("$PMTK314,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29");
+  Serial.flush();
+#else
+  // Assume NMEA-0183 default baud rate of 4800
+  Serial.begin(4800);
+#endif
   OUT_DDR |= 0x0f;
   pinMode(PTT, OUTPUT);
   digitalWrite(PTT, LOW);
@@ -675,6 +690,13 @@ void setup() {
 void loop() {
   readNmeaRmc();
   uint32_t now = millis();
+#ifdef GPSM_L80R
+  // L80-R: Wake up the module if config.interval has expired - wakeup happens on any serial activity
+  if ((now - lastBroadcast) > config.interval) {
+    Serial.print("\r");
+    Serial.flush();
+  }
+#endif
   if (abcPressed || setPressed) {
     lastPressed = now;
   }
@@ -689,8 +711,8 @@ void loop() {
       lcd.backlight();
       lcd.display();
     }
-    return;
-  } else if (now - lastPressed > 30000) {
+  } else {
+    if (now - lastPressed > 30000) {
       off = true;
       lcd.noDisplay();
       lcd.noBacklight();
@@ -728,5 +750,6 @@ void loop() {
     } else if (page == 3) {
       printDateTime();
     }
+  }
   LowPower.idle(SLEEP_FOREVER, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_ON, SPI_OFF, USART0_ON, TWI_OFF);
 }