// function to write a register value to the adc
// argumen: adress for the register to write into, value to write
void ads12xx::SetRegisterValue(uint8_t regAdress, uint8_t regValue) {
#ifdef ADS1248
if (regAdress == IDAC0) {
regValue = regValue | IDAC0_ID; // add non 0 non-write register value IDAC0_ID
}
#endif
uint8_t regValuePre = ads12xx::GetRegisterValue(regAdress);
if (regValue != regValuePre) {
delayMicroseconds(10);
waitforDRDY();
SPI.beginTransaction(SPISettings(SPI_SPEED, MSBFIRST, SPI_MODE1)); // initialize SPI with SPI_SPEED, MSB first, SPI Mode1
digitalWrite(_CS, LOW);
delayMicroseconds(10);
SPI.transfer(WREG | regAdress); // send 1st command byte, address of the register
SPI.transfer(0x00); // send 2nd command byte, write only one register
SPI.transfer(regValue); // write data (1 Byte) for the register
delayMicroseconds(10);
digitalWrite(_CS, HIGH);
if (regValue != ads12xx::GetRegisterValue(regAdress)) { //Check if write was succesfull
Serial.print("Write to Register 0x");
Serial.print(regAdress, HEX);
Serial.println(" failed!");
}
else
SPI.endTransaction();
}
}
/*
Sends a Command to the ADC
Like SELFCAL, GAIN, SYNC, WAKEUP
*/
void ads12xx::SendCMD(uint8_t cmd) {
waitforDRDY();
SPI.beginTransaction(SPISettings(SPI_SPEED, MSBFIRST, SPI_MODE1)); // initialize SPI with 4Mhz clock, MSB first, SPI Mode0
digitalWrite(_CS, LOW);
delayMicroseconds(10);
SPI.transfer(cmd);
delayMicroseconds(10);
digitalWrite(_CS, HIGH);
SPI.endTransaction();
}
//function to read a register value from the adc
//argument: adress for the register to read
unsigned long ads12xx::GetRegisterValue(uint8_t regAdress) {
waitforDRDY();
SPI.beginTransaction(SPISettings(SPI_SPEED, MSBFIRST, SPI_MODE1)); // initialize SPI with 4Mhz clock, MSB first, SPI Mode0
uint8_t bufr;
digitalWrite(_CS, LOW);
delayMicroseconds(10);
SPI.transfer(RREG | regAdress); // send 1st command byte, address of the register
SPI.transfer(0x00); // send 2nd command byte, read only one register
delayMicroseconds(10);
bufr = SPI.transfer(NOP); // read data of the register
delayMicroseconds(10);
digitalWrite(_CS, HIGH);
return bufr;
SPI.endTransaction();
}
// function to get a 3byte conversion result from the adc
long ads12xx::GetConversion() {
int32_t regData;
waitforDRDY(); // Wait until DRDY is LOW
SPI.beginTransaction(SPISettings(SPI_SPEED, MSBFIRST, SPI_MODE1));
digitalWrite(_CS, LOW); //Pull SS Low to Enable Communications with ADS1247
delayMicroseconds(10); // RD: Wait 25ns for ADC12xx to get ready
SPI.transfer(RDATA); //Issue RDATA
delayMicroseconds(10);
regData |= SPI.transfer(NOP);
//delayMicroseconds(10);
regData <<= 8;
regData |= SPI.transfer(NOP);
//delayMicroseconds(10);
regData <<= 8;
regData |= SPI.transfer(NOP);
delayMicroseconds(10);
digitalWrite(_CS, HIGH);
SPI.endTransaction();
return regData;
}
