This example configures ADC1 to read a 16 bit analog value of PA7 using a polled loop. The serial output is available on the STLink header.
#include <Arduino.h>
#include <stm32h7xx_hal.h>
ADC_HandleTypeDef hadc1;
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
// Enable the GPIOA clock
__HAL_RCC_GPIOA_CLK_ENABLE();
/**ADC1 GPIO Configuration
PA7 ------> ADC1_IN7
*/
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
static void MX_ADC1_Init(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc1.Init.Resolution = ADC_RESOLUTION_16B;
hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc1.Init.LowPowerAutoWait = DISABLE;
hadc1.Init.ContinuousConvMode = DISABLE;
hadc1.Init.NbrOfConversion = 1;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
//hadc1.Init.DMAContinuousRequests = DISABLE;
hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
hadc1.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
// Initialization Error
}
sConfig.Channel = ADC_CHANNEL_7;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
// Channel Configuration Error
}
}
void setup() {
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_ADC1_Init();
Serial.begin(115200);
}
void loop() {
HAL_ADC_Start(&hadc1); // Start ADC conversion
HAL_ADC_PollForConversion(&hadc1, HAL_MAX_DELAY); // Wait for conversion to complete
uint32_t adcValue = HAL_ADC_GetValue(&hadc1); // Read the ADC converted value
Serial.printf("ADC value: %04X\n", adcValue);
}[env:nucleo_h743zi] platform = ststm32 board = nucleo_h743zi framework = arduino monitor_speed = 115200
Example output (unconnected):
ADC value: 04B6 ADC value: 049C ADC value: 04AC ADC value: 04AE ADC value: 0497 ADC value: 04AF ADC value: 04A7 ADC value: 04C6 ADC value: 0491 ADC value: 04A1 ADC value: 04AF ADC value: 0493 ADC value: 0497 ADC value: 04AF ADC value: 04A3 ADC value: 047D ADC value: 04C1 ADC value: 04B1 ADC value: 04AF ADC value: 0498 ADC value: 04A1 ADC value: 04C3 ADC value: 04AE ADC value: 04AC ADC value: 0489 ADC value: 0491 ADC value: 0491 ADC value: 047E ADC value: 04B8 ADC value: 0494 ADC value: 04A5 ADC value: 0491 ADC value: 0494 ADC value: 048A ADC value: 0499 ADC value: 0494 ADC value: 049E