ADC Interface

Note

The Analog-Digital converter is a way to read in analog values, for example the voltage after the Potentiometer, and turn it into a Digital value the Microcontroller can work with.

Simple Usage

ADCs in libyggdrasil can be used as if they were read-only variables. Reading will return a floating point value between 0 and 1 where 0 represents a voltage of 0V on the ADC Pin and 1 represents a voltage equivaluent to the Reference voltage of 3.3V. Writing to an ADC pin is not possible.

The following code will read the current voltage after the Potentiometer.

CC++

const double ReferenceVoltage = 3.3;

float adcValue = yggdrasil_ADC_Read(ADCPotentiometer);
float voltage = adcValue * ReferenceVoltage;

Available Pins

Name	Description
ADCA	Analog Header ADC A
ADCB	Analog Header ADC B
ADCC	Analog Header ADC C
ADCD	Analog Header ADC D
ADCPotentiometer	Potentiometer voltage
ADCTemperature	Internal temperature sensor

Custom ADC

In order to read the voltage of a ADC pin that has not been pre-defined by libyggdrasil, first it needs to be properly configured through the project’s .ioc file. Once this is done, the new ADC can be defined like this:

CC++

adc_t MyADCChannel = { &hadc7, 14 };

and then used like all other ADCs.

CC++

float myADCValue = yggdrasil_ADC_Read(MyADCChannel);