bspAdc

Configuration

  1. AnalogInput.h: Register configuration for 12-bit ADC.

    • The enum inside Adc12BitConfiguration class defines the values for registers.

  2. analogInputConfiguration.h: ADC input channel configuration.

    • The adc input signal mapping to digital pin is present in the ADChannelCfg array.

    • The format inside the array is as follows:

    <ADC Module>, <ADC Channel>, <Io_pin>, <conversion channel>.

    • The list of ADC input signal IDs present in the AnalogInputId enum corresponds to the order of the ADChannelCfg array.

    • The value inside the enum will be used to select the channel in the application.

  3. analogInputConfigurationString.h: List of adc input signal names for the debugging console.

    • The order of the adcChannelsNamingStrings array corresponds to the AnalogInputId enum.

  4. analogInputScaleConfiguration.h: Scaling configuration applicable to adc signals.

    • The analogInputScaleConfiguration array contains the list of scaling functions available with configurable precision and resolution (Scaling Factor).

    • The order of configuarations for each channel corresponds to AnalogInputId enum.

Analog Input

AnalogInput class in the AnalogInput.h is handling initialization, starting conversions and the stopping of adc module based on the configuration provided in the analogInputConfiguration.h.

Analog Input Scale

AnalogInputScale class in the AnalogInputScale.h is handling the scaling of raw ADC value to the application parameter based on the configuration provided in the analogInputScaleConfiguration.h.

Application Interface

To get a raw 12-bit value from ADC, use

bsp::BspReturnCode bios::AnalogInput::get(uint16_t channel, uint16_t& value)

To get the scaled value, use

bsp::BspReturnCode bios::AnalogInputScale::get(uint16_t channel, uint16_t& value)

Example

#ifdef PLATFORM_SUPPORT_IO
#include "bsp/adc/AnalogInputScale.h"
#endif

void DemoSystem::cyclic()
{
#ifdef PLATFORM_SUPPORT_IO
    uint32_t value;
    (void)AnalogInputScale::get(AnalogInput::AiEVAL_POTI_ADC, value);
#endif
}

This code snippet placed in the demo system could read the ADC value and store the scaled data in the variable value wth the context menu.

As per the demo, ADC channel is configured to read a value from internal potentiometer (ADC0 - Channel_28) available in the evaluation board. The value is then scaled to milli voltage (0-5000mV).