hardware_adc Library Functions

To use this library, add following to the C/C++ file,

#include <hardware/adc.h>

and following to the CMakeLists.txt file.

target_link_libraries(projectName pico_stdlib hardware_gpio hardware_adc)

Following are some of the most commonly used functions for configuring the ADC.

adc_init()

Initialize the ADC peripheral on the μC.

adc_gpio_init(uint8_t pinNo)

This function initializes a GPIO to work with an ADC input.

• Function input pinNo can be any GPIO number that supports ADC input, i.e. 26 through 29.

adc_select_input(uint8_t adcIn)

This function prepares an ADC input for reading.

• Function input adcIn can be any ADC input number, i.e. 0 through 5.

uint16_t adc_read()

This function makes ADC to read voltage from the input selected using adc_select_input(adcIn) function.

• Function returns an unsigned integer in the range of 0-4095 that corresponds to the measured voltage.

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Working of an ADc