ADCDAC Pi Library for C++

C++ Library to use with the ADC DAC Pi Raspberry Pi development board.

The example demo files can be found in /ABElectronics_CPP_Libraries/ADCDACPi/demos.

Downloading and Installing the library

To download to your Raspberry Pi type in the terminal:

git clone https://github.com/abelectronicsuk/ABElectronics_CPP_Libraries.git

Classes:

ADCDACPi()

Methods:

open_adc()

Open the ADC SPI bus channel. This needs to be called before using the ADC.

close_adc()

Close the ADC SPI bus channel.

open_dac()

Open the DAC SPI bus channel. This needs to be called before using the DAC.

close_dac()

Close the DAC SPI bus channel.

read_adc_voltage(uint8_t channel, uint8_t mode) 

Read the voltage from the selected channel on the ADC.
Parameter: channel - 1 or 2
Parameter: mode - 0 = single-ended, 1 = differential
Returns: (double) between 0V and the reference voltage

read_adc_raw(uint8_t channel, uint8_t mode) 

Read the raw value from the selected channel on the ADC.
Parameter: channel - 1 or 2
Parameter: mode - 0 = Single Ended or 1 = Differential
When in differential mode, setting the channel to 1 will make IN1 = IN+ and IN2 = IN-
When in differential mode, setting the channel to 2 will make IN1 = IN- and IN2 = IN+
Returns: (uint16_t) 12-bit value between 0 and 4096

set_adc_refvoltage(double ref)

Set the reference voltage for the analogue to digital converter.
The ADC uses the raspberry pi 3.3V power as a voltage reference so using this method to set the reference to match the exact output voltage from the 3.3V regulator will increase the accuracy of the ADC readings.
Parameter: ref - reference voltage
Returns: null

set_dac_voltage(double voltage, uint8_t channel)

Set the voltage for the selected channel on the DAC. The DAC has two gain values, 1 or 2, which can be set when the ADCDAC object is created. A gain of 1 will give a voltage between 0 and 2.047 volts. A gain of 2 will give a voltage between 0 and 3.3 volts.
Parameter: channel - 1 or 2
Parameter: voltage - target DAC voltage
Returns: null

set_dac_raw(uint16_t raw, uint8_t channel)

Set the raw value for the selected channel on the DAC.
Parameter: raw - between 0 and 4095
Parameter: channel - 1 or 2
Returns: null

set_dac_gain(uint8_t gain)

Set the DAC gain.
Parameter: gain - 1 or 2 - The output voltage will be between 0 and 2.048V when the gain is set to 1; 0 and 3.3V when the gain is set to 2
Returns: null