/**
* Initializes the temperature sensor.
* This method is called when the sensor is first created and also any time the sensor reports it's disconnected.
* If the result is TEMP_SENSOR_DISCONNECTED then subsequent calls to read() will also return TEMP_SENSOR_DISCONNECTED.
* Clients should attempt to re-initialize the sensor by calling init() again.
*/
bool OneWireTempSensor::init(){
// save address and pinNr for log messages
char addressString[17];
printBytes(sensorAddress, 8, addressString);
uint8_t pinNr = oneWire->pinNr();
bool success = false;
if (sensor==NULL) {
sensor = new DallasTemperature(oneWire);
if (sensor==NULL) {
logErrorString(ERROR_SRAM_SENSOR, addressString);
}
}
logDebug("init onewire sensor");
// This quickly tests if the sensor is connected and initializes the reset detection.
// During the main TempControl loop, we don't want to spend many seconds
// scanning each sensor since this brings things to a halt.
if (sensor && sensor->initConnection(sensorAddress) && requestConversion()) {
logDebug("init onewire sensor - wait for conversion");
waitForConversion();
temperature temp = readAndConstrainTemp();
DEBUG_ONLY(logInfoIntStringTemp(INFO_TEMP_SENSOR_INITIALIZED, pinNr, addressString, temp));
success = temp!=DEVICE_DISCONNECTED && requestConversion();
}
setConnected(success);
logDebug("init onewire sensor complete %d", success);
return success;
}
int myAnalogRead (struct wiringPiNodeStruct *node, int chan)
{
unsigned char config ;
unsigned char buffer [4] ;
int value = 0 ;
int realChan = (chan & 3) - node->pinBase ;
// One-shot mode, trigger plus the other configs.
config = 0x80 | (realChan << 5) | (node->data0 << 2) | (node->data1) ;
wiringPiI2CWrite (node->fd, config) ;
switch (node->data0) // Sample rate
{
case MCP3422_SR_3_75: // 18 bits
waitForConversion (node->fd, &buffer [0], 4) ;
value = ((buffer [0] & 3) << 16) | (buffer [1] << 8) | buffer [2] ;
break ;
case MCP3422_SR_15: // 16 bits
waitForConversion (node->fd, buffer, 3) ;
value = (buffer [0] << 8) | buffer [1] ;
break ;
case MCP3422_SR_60: // 14 bits
waitForConversion (node->fd, buffer, 3) ;
value = ((buffer [0] & 0x3F) << 8) | buffer [1] ;
break ;
case MCP3422_SR_240: // 12 bits - default
waitForConversion (node->fd, buffer, 3) ;
value = ((buffer [0] & 0x0F) << 8) | buffer [1] ;
break ;
}
return value ;
}
/**
* Initializes the temperature sensor.
* This method is called when the sensor is first created and also any time the sensor reports it's disconnected.
* If the result is TEMP_SENSOR_DISCONNECTED then subsequent calls to read() will also return TEMP_SENSOR_DISCONNECTED.
* Clients should attempt to re-initialize the sensor by calling init() again.
*/
bool OneWireTempSensor::init() {
// save address and pinNr for log messages
char addressString[17];
printBytes(sensorAddress, 8, addressString);
#if BREWPI_DEBUG
uint8_t pinNr = oneWire->pinNr();
#endif
bool success = false;
if (sensor == NULL) {
sensor = new DallasTemperature(oneWire);
if (sensor == NULL) {
logErrorString(ERROR_SRAM_SENSOR, addressString);
}
}
logDebug("init onewire sensor");
// This quickly tests if the sensor is connected and initializes the reset detection if necessary.
if (sensor){
// If this is the first conversion after power on, the device will return DEVICE_DISCONNECTED_RAW
// Because HIGH_ALARM_TEMP will be copied from EEPROM
int16_t temp = sensor->getTempRaw(sensorAddress);
if(temp == DEVICE_DISCONNECTED_RAW){
// Device was just powered on and should be initialized
if(sensor->initConnection(sensorAddress)){
requestConversion();
waitForConversion();
temp = sensor->getTempRaw(sensorAddress);
}
}
DEBUG_ONLY(logInfoIntStringTemp(INFO_TEMP_SENSOR_INITIALIZED, pinNr, addressString, temp));
success = temp != DEVICE_DISCONNECTED_RAW;
if(success){
requestConversion(); // piggyback request for a new conversion
}
}
setConnected(success);
logDebug("init onewire sensor complete %d", success);
return success;
}
