[National Technology Automotive MCU N32A455 Development Board] ADC test knob potentiometer

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[National Technology Automotive MCU N32A455 Development Board] ADC test knob potentiometer [Copy link]

In the test of using ADC to read the potentiometer, we first use a single line to connect the potentiometer output pin PB15 and the read pin PC0. The wiring diagram is as follows:

Then use the ADC_SingleRead program in the demo, the code is as follows:

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 * this software without specific prior written permission.
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/**
 * [url=home.php?mod=space&uid=1307177]@File[/url] main.c
 * [url=home.php?mod=space&uid=1315547]@author[/url] Nations
 * [url=home.php?mod=space&uid=252314]@version[/url] v1.0.0
 *
 * @copyright Copyright (c) 2022, Nations Technologies Inc. All rights reserved.
 */
#include "main.h"

/** @addtogroup ADC_ADC1_DMA
 * @{
 */

ADC_InitType ADC_InitStructure;
DMA_InitType DMA_InitStructure;
__IO uint16_t ADC1ConvertedValue[5],ADC2ConvertedValue[5],ADC3ConvertedValue[5],ADC4ConvertedValue[5];

void RCC_Configuration(void);
void GPIO_Configuration(void);
uint16_t ADC_GetData(ADC_Module* ADCx, uint8_t ADC_Channel);
void ADC_Initial(ADC_Module* ADCx);

void ADC_Initial(ADC_Module* ADCx)
{
    /* ADC configuration ------------------------------------------------------*/
    ADC_InitStructure.WorkMode       = ADC_WORKMODE_INDEPENDENT;
    ADC_InitStructure.MultiChEn      = DISABLE;
    ADC_InitStructure.ContinueConvEn = DISABLE;
    ADC_InitStructure.ExtTrigSelect  = ADC_EXT_TRIGCONV_NONE;
    ADC_InitStructure.DatAlign       = ADC_DAT_ALIGN_R;
    ADC_InitStructure.ChsNumber      = 1;
    ADC_Init(ADCx, &ADC_InitStructure);


    /* Enable ADC */
    ADC_Enable(ADCx, ENABLE);
    /*Check ADC Ready*/
    while(ADC_GetFlagStatusNew(ADCx,ADC_FLAG_RDY) == RESET)
        ;
    /* Start ADC calibration */
    ADC_StartCalibration(ADCx);
    /* Check the end of ADC calibration */
    while (ADC_GetCalibrationStatus(ADCx))
        ;
}
/**
 * [url=home.php?mod=space&uid=159083]@brief[/url] Main program
 */
int main(void)
{
    /* System clocks configuration ---------------------------------------------*/
    RCC_Configuration();

    /* GPIO configuration ------------------------------------------------------*/
    GPIO_Configuration();
    
    ADC_Initial(ADC1);
    ADC_Initial(ADC2);
    ADC_Initial(ADC3);
    ADC_Initial(ADC4);

    while (1)
    {
        ADC1ConvertedValue[0]=ADC_GetData(ADC1,ADC1_Channel_06_PC0);
        ADC1ConvertedValue[1]=ADC_GetData(ADC1,ADC1_Channel_07_PC1);
        
        ADC2ConvertedValue[0]=ADC_GetData(ADC2,ADC2_Channel_08_PC2);
        ADC2ConvertedValue[1]=ADC_GetData(ADC2,ADC2_Channel_09_PC3);
        
        ADC3ConvertedValue[0]=ADC_GetData(ADC3,ADC3_Channel_07_PD10);
        ADC3ConvertedValue[1]=ADC_GetData(ADC3,ADC3_Channel_08_PD11);
        
        ADC4ConvertedValue[0]=ADC_GetData(ADC4,ADC4_Channel_09_PD12);
        ADC4ConvertedValue[1]=ADC_GetData(ADC4,ADC4_Channel_10_PD13);
    }
}

/**
 * @brief  Configures the different system clocks.
 */
void RCC_Configuration(void)
{
    /* Enable peripheral clocks ------------------------------------------------*/

    /* Enable GPIOC clocks */
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOF|RCC_APB2_PERIPH_GPIOG|RCC_APB2_PERIPH_GPIOA|RCC_APB2_PERIPH_GPIOB|RCC_APB2_PERIPH_GPIOC|RCC_APB2_PERIPH_GPIOD|RCC_APB2_PERIPH_GPIOE, ENABLE);
    /* Enable ADC1, ADC2, ADC3 and ADC4 clocks */
    RCC_EnableAHBPeriphClk(RCC_AHB_PERIPH_ADC1 | RCC_AHB_PERIPH_ADC2 | RCC_AHB_PERIPH_ADC3 | RCC_AHB_PERIPH_ADC4,
                           ENABLE);

    /* RCC_ADCHCLK_DIV16*/
    ADC_ConfigClk(ADC_CTRL3_CKMOD_AHB,RCC_ADCHCLK_DIV16);
    RCC_ConfigAdc1mClk(RCC_ADC1MCLK_SRC_HSE, RCC_ADC1MCLK_DIV8);  //selsect HSE as RCC ADC1M CLK Source		
}

/**
 * @brief  Configures the different GPIO ports.
 */
void GPIO_Configuration(void)
{
    GPIO_InitType GPIO_InitStructure;
    
    /* Configure PC0 PC1 as analog input -------------------------*/
    GPIO_InitStructure.Pin       = GPIO_PIN_0 | GPIO_PIN_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_InitPeripheral(GPIOC, &GPIO_InitStructure);
    /* Configure PC2 PC3 as analog input -------------------------*/
    GPIO_InitStructure.Pin       = GPIO_PIN_2 | GPIO_PIN_3;
    GPIO_InitPeripheral(GPIOC, &GPIO_InitStructure);
    /* Configure PD10 PD11 as analog input -------------------------*/
    GPIO_InitStructure.Pin       = GPIO_PIN_10 | GPIO_PIN_11;
    GPIO_InitPeripheral(GPIOD, &GPIO_InitStructure);
    /* Configure PD12 PD13 as analog input -------------------------*/
    GPIO_InitStructure.Pin       = GPIO_PIN_12 | GPIO_PIN_13;
    GPIO_InitPeripheral(GPIOD, &GPIO_InitStructure);
}

uint16_t ADC_GetData(ADC_Module* ADCx, uint8_t ADC_Channel)
{
    uint16_t dat;
    
    ADC_ConfigRegularChannel(ADCx, ADC_Channel, 1, ADC_SAMP_TIME_239CYCLES5);
    /* Start ADC Software Conversion */
    ADC_EnableSoftwareStartConv(ADCx, ENABLE);
    while(ADC_GetFlagStatus(ADCx, ADC_FLAG_ENDC)==0){
    }
    ADC_ClearFlag(ADCx, ADC_FLAG_ENDC);
    ADC_ClearFlag(ADCx, ADC_FLAG_STR);
    dat=ADC_GetDat(ADCx);
    return dat;
}

#ifdef USE_FULL_ASSERT

/**
 * @brief  Reports the name of the source file and the source line number
 *         where the assert_param error has occurred.
 * @param file pointer to the source file name
 * @param line assert_param error line source number
 */
void assert_failed(const uint8_t* expr, const uint8_t* file, uint32_t line)
{
    /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

    /* Infinite loop */
    while (1)
    {
    }
}

#endif

/**
 * @}
 */

/**
 * @}
 */

Finally, when the knob is at the far left, the value of PC0 is read as follows:

Turn the knob to the far right to read the value of PC0:

It was found that PC1 changed with the change, so PC1 was connected to GND. The wiring diagram is as follows:

After completing the wiring, read the reading when the knob is in the leftmost position:

Turn the knob to the rightmost reading:

After overall testing, the ADC has little jitter on the limit voltage, and the accuracy feels good.