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Optionally Specify SPIClass in beginSPI #56

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Merged
merged 2 commits into from
Oct 6, 2025
+14 −12
Merged

Optionally Specify SPIClass in beginSPI #56

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7569e49
Support for SPIClass
pschatzmann Oct 5, 2025
d7f0b8c
Undo changes to TwoWire
pschatzmann Oct 5, 2025
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23 changes: 12 additions & 11 deletions src/SparkFunBME280.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ May 20, 2015

Resources:
Uses Wire.h for i2c operation
Uses SPI.h for SPI operation
Uses _spiPort->h for SPI operation

Development environment specifics:
Arduino IDE 1.8.5
Expand Down Expand Up @@ -87,7 +87,7 @@ uint8_t BME280::begin()

case SPI_MODE:
// start the SPI library:
SPI.begin();
_spiPort->begin();
// initialize the data ready and chip select pins:
pinMode(settings.chipSelectPin, OUTPUT);
digitalWrite(settings.chipSelectPin, HIGH);
Expand Down Expand Up @@ -138,8 +138,9 @@ uint8_t BME280::begin()
}

//Begin comm with BME280 over SPI
bool BME280::beginSPI(uint8_t csPin)
bool BME280::beginSPI(uint8_t csPin, SPIClass &spiPort)
{
_spiPort = &spiPort;
settings.chipSelectPin = csPin;
settings.commInterface = SPI_MODE;

Expand Down Expand Up @@ -691,21 +692,21 @@ void BME280::readRegisterRegion(uint8_t *outputPointer , uint8_t offset, uint8_t
break;

case SPI_MODE:
SPI.beginTransaction(settings.spiSettings);
_spiPort->beginTransaction(settings.spiSettings);
// take the chip select low to select the device:
digitalWrite(settings.chipSelectPin, LOW);
// send the device the register you want to read:
SPI.transfer(offset | 0x80); //Ored with "read request" bit
_spiPort->transfer(offset | 0x80); //Ored with "read request" bit
while ( i < length ) // slave may send less than requested
{
c = SPI.transfer(0x00); // receive a byte as character
c = _spiPort->transfer(0x00); // receive a byte as character
*outputPointer = c;
outputPointer++;
i++;
}
// take the chip select high to de-select:
digitalWrite(settings.chipSelectPin, HIGH);
SPI.endTransaction();
_spiPort->endTransaction();
break;

default:
Expand Down Expand Up @@ -799,17 +800,17 @@ void BME280::writeRegister(uint8_t offset, uint8_t dataToWrite)
break;

case SPI_MODE:
SPI.beginTransaction(settings.spiSettings);
_spiPort->beginTransaction(settings.spiSettings);
// take the chip select low to select the device:
digitalWrite(settings.chipSelectPin, LOW);
// send the device the register you want to read:
SPI.transfer(offset & 0x7F);
_spiPort->transfer(offset & 0x7F);
// send a value of 0 to read the first byte returned:
SPI.transfer(dataToWrite);
_spiPort->transfer(dataToWrite);
// decrement the number of bytes left to read:
// take the chip select high to de-select:
digitalWrite(settings.chipSelectPin, HIGH);
SPI.endTransaction();
_spiPort->endTransaction();
break;

default:
Expand Down
3 changes: 2 additions & 1 deletion src/SparkFunBME280.h
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Original file line number Diff line number Diff line change
Expand Up @@ -199,7 +199,7 @@ class BME280
//Call to apply BME280_SensorSettings.
//This also gets the SensorCalibration constants
uint8_t begin( void );
bool beginSPI(uint8_t csPin); //Communicate using SPI
bool beginSPI(uint8_t csPin, SPIClass &spiPort=SPI); //Communicate using SPI
bool beginI2C(TwoWire &wirePort = Wire); //Called when user provides Wire port

#ifdef SoftwareWire_h
Expand Down Expand Up @@ -266,6 +266,7 @@ class BME280

uint8_t _wireType = HARD_WIRE; //Default to Wire.h
TwoWire *_hardPort = NO_WIRE; //The generic connection to user's chosen I2C hardware
SPIClass *_spiPort = &SPI; //The generic connection to user's chosen SPI hardware

#ifdef SoftwareWire_h
SoftwareWire *_softPort = NO_WIRE; //Or, the generic connection to software wire port
Expand Down