STM32F411RE WORKING HAL ADC EXAMPLE

Dependencies:   mbed

#include "mbed.h"
#include "string"

#include "cmsis.h"
#include "pinmap.h"
#include "PeripheralPins.h"

 
Serial pc(USBTX, USBRX);  

uint32_t g_ADCValue;
float g_ADC_Value_Volts;
const float maxAdcBits = 4095.0f; // Using Float for clarity
const float maxVolts = 3.3f;      // Using Float for clarity
const float voltsPerBit = (maxVolts / maxAdcBits);

int main()
{
    //Start of initializing analog input on pin PC_1
    ADC_HandleTypeDef AdcHandle;
    GPIO_InitTypeDef gpioInit;
    //Start GPIO and ADC1 Clocks
    __GPIOC_CLK_ENABLE();
    __ADC1_CLK_ENABLE();
    //Define PC_1 which is Pin one of group C and connected to a 10K potentiometer.
    gpioInit.Pin = GPIO_PIN_1;
    gpioInit.Mode = GPIO_MODE_ANALOG;
    gpioInit.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOC, &gpioInit);
    
    // Configure ADC
    AdcHandle.Instance = ADC1;
    AdcHandle.Init.ClockPrescaler        = ADC_CLOCKPRESCALER_PCLK_DIV2;
    AdcHandle.Init.Resolution            = ADC_RESOLUTION12b;
    AdcHandle.Init.ScanConvMode          = DISABLE;
    AdcHandle.Init.ContinuousConvMode    = ENABLE;
    AdcHandle.Init.DiscontinuousConvMode = DISABLE;
    AdcHandle.Init.NbrOfDiscConversion   = 0;
    AdcHandle.Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIGCONVEDGE_NONE;
    AdcHandle.Init.ExternalTrigConv      = ADC_EXTERNALTRIGCONV_T1_CC1;
    AdcHandle.Init.DataAlign             = ADC_DATAALIGN_RIGHT;
    AdcHandle.Init.NbrOfConversion       = 1;
    AdcHandle.Init.DMAContinuousRequests = DISABLE;
    AdcHandle.Init.EOCSelection          = DISABLE;

    if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
        pc.printf("Cannot initialize ADC\n");
        while(1){
            }
    }
    ADC_ChannelConfTypeDef sConfig = {0};
    // Configure ADC channel
    sConfig.Rank         = 1;
    sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
    sConfig.Offset       = 0;
    sConfig.Channel = ADC_CHANNEL_11;
    
    if (HAL_ADC_ConfigChannel(&AdcHandle, &sConfig) != HAL_OK) {
        pc.printf("Cannot config channel\r\n");
        while(1){
            }
    }
    HAL_ADC_ConfigChannel(&AdcHandle, &sConfig); //Not sure why, but I have to do this twice?
    pc.printf("AnalogIn example\r\n");
    HAL_ADC_Start(&AdcHandle); // Start conversion
    while(1) {
         g_ADCValue = 0;
         if (HAL_ADC_PollForConversion(&AdcHandle, 1000000) == HAL_OK) {
            g_ADCValue = HAL_ADC_GetValue(&AdcHandle);
            g_ADC_Value_Volts = g_ADCValue*voltsPerBit;
            pc.printf("Conversion ready \r\n");
            printf("measure = %f V \r\n", g_ADC_Value_Volts);
         } else {
            pc.printf("Conversion not ready \r\n");
        }
        wait(1.0); // 1 second
    }
}

Changes

RevisionDateWhoCommit message
0:797cb3866420 14 months ago trevieze STM32F411RE HAL ADC WORKING EXAMPLE. default tip