Temperature sanity check

2026-04-17 23:32:26 +02:00
parent 9492984850
commit f31159b430
1 changed files with 8 additions and 2 deletions
@@ -281,8 +281,14 @@ static time_t readExternalRTC() {
 static float readExternalTemp() {
  Wire.beginTransmission(DS3231_ADDRESS);
  Wire.write(0x11);
-  Wire.endTransmission();
-  Wire.requestFrom(DS3231_ADDRESS, (uint8_t)2);
+  if (Wire.endTransmission() != 0) {
+    return 0.0f;
+  }
+
+  int count = Wire.requestFrom(DS3231_ADDRESS, (uint8_t)2);
+  if (count < 2) {
+    return 0.0f;
+  }

  int8_t msb = Wire.read();
  uint8_t lsb = Wire.read();