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This application note explains how to use the STM32H7 ADC in the FreeRTOS demo application.
1. Understanding ADC Interfaces
1.1. FreeRTOS ADC Implementation
The FreeRTOS BSP makes use of the STM32CubeH7 software component to provide a device driver for the STM32H7 ADC. The driver is configured (enabled / disabled) at the BSP build time, using the HAL_ADC_MODULE_ENABLED configuration option, defined in the stm32h7xx_hal_conf.h file.
1.2. FreeRTOS ADC C-Binding API
The ADC driver implements the following C-binding API:
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typedef struct
{
uint32_t Channel; /* Specify the channel to configure
into ADC regular group. */
uint32_t Rank; /* Specify the rank in the regular
group sequencer. */
uint32_t SamplingTime; /* Sampling time value to be set for
the selected channel. */
uint32_t SingleDiff; /* Select single-ended or differential
input. */
uint32_t OffsetNumber; /* Select the offset number. */
uint32_t Offset; /* Define the offset to be subtracted
from the raw converted data. */
FunctionalState OffsetRightShift; /* Define the Right-shift data
after Offset correction. */
FunctionalState OffsetSignedSaturation; /* Specify whether the Signed
saturation feature is used or not.*/
} ADC_ChannelConfTypeDef;
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2. ADC CLI Command
The FreeRTOS application implements the following ADC related CLI command:
Command | Description | Comments |
| Run the ADC test in the single-ended input mode |
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3. Validating ADC Operation
Use the following step-wise procedure to validate the FreeRTOS ADC operation:
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