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Add debug output in case of CRC error reading temp

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This commit is contained in:
Blaž Kristan 2021-12-16 10:47:56 +01:00
parent b2cf7a16f2
commit 9c84f13425
1 changed files with 4 additions and 3 deletions
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7
usermods/Temperature/usermod_temperature.h
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@ -55,13 +55,14 @@ class UsermodTemperature : public Usermod {
//Dallas sensor quick (& dirty) reading. Credit to - Author: Peter Scargill, August 17th, 2013 //Dallas sensor quick (& dirty) reading. Credit to - Author: Peter Scargill, August 17th, 2013
float readDallas() { float readDallas() {
byte i; byte i;
byte data[2]; byte data[9];
int16_t result; // raw data from sensor int16_t result; // raw data from sensor
if (!oneWire->reset()) return -127.0f; // send reset command and fail fast if (!oneWire->reset()) return -127.0f; // send reset command and fail fast
oneWire->skip(); // skip ROM oneWire->skip(); // skip ROM
oneWire->write(0xBE); // read (temperature) from EEPROM oneWire->write(0xBE); // read (temperature) from EEPROM
for (i=0; i < 2; i++) data[i] = oneWire->read(); // first 2 bytes contain temperature for (i=0; i < 9; i++) data[i] = oneWire->read(); // first 2 bytes contain temperature
for (i=2; i < 9; i++) oneWire->read(); // read unused bytes if (OneWire::crc8(data,8) != data[8]) DEBUG_PRINTLN(F("CRC error reading temperature."));
// for (i=2; i < 9; i++) oneWire->read(); // read unused bytes
// result = (data[1]<<4) | (data[0]>>4); // we only need whole part, we will add fraction when returning // result = (data[1]<<4) | (data[0]>>4); // we only need whole part, we will add fraction when returning
// if (data[1]&0x80) result |= 0xFF00; // fix negative value // if (data[1]&0x80) result |= 0xFF00; // fix negative value
oneWire->reset(); oneWire->reset();