CH32V208双ADC模式

配置CH32V208外设ADC1和ADC2为同步规则模式,并用DMA搬运数据到内存。从串口数据发现,ADC1可以正确读出数据,而ADC2转换数据一直为0,请问这是什么原因?

#include "debug.h"


/* Global Variable */

u32 TxBuf[1];

u16 Adc_Val[4];

s16 Calibrattion_Val1 = 0;

s16 Calibrattion_Val2 = 0;


void DMA1_Channel1_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));


/*********************************************************************

 * @fn      ADC_Function_Init

 *

 * @brief   Initializes ADC collection.

 *

 * @return  none

 */

void ADC_Function_Init(void)

{

    ADC_InitTypeDef  ADC_InitStructure = {0};

    GPIO_InitTypeDef GPIO_InitStructure = {0};


    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE);

    RCC_ADCCLKConfig(RCC_PCLK2_Div4);


    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_3;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

    GPIO_Init(GPIOA, &GPIO_InitStructure);


    ADC_DeInit(ADC1);

    ADC_DeInit(ADC2);


    ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult;

    ADC_InitStructure.ADC_ScanConvMode = DISABLE;

    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;

    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;

    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

    ADC_InitStructure.ADC_NbrOfChannel = 1;

    ADC_InitStructure.ADC_OutputBuffer = ADC_OutputBuffer_Disable;

    ADC_InitStructure.ADC_Pga = ADC_Pga_1;


    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5);


    ADC_DMACmd(ADC1, ENABLE);

    ADC_Cmd(ADC1, ENABLE);


    ADC_BufferCmd(ADC1, DISABLE); //disable buffer

    ADC_ResetCalibration(ADC1);

    while(ADC_GetResetCalibrationStatus(ADC1));

    ADC_StartCalibration(ADC1);

    while(ADC_GetCalibrationStatus(ADC1));

    Calibrattion_Val1 = Get_CalibrationValue(ADC1);


    ADC_BufferCmd(ADC1, ENABLE); //enable buffer


    ADC_Init(ADC2, &ADC_InitStructure);

    ADC_RegularChannelConfig(ADC2, ADC_Channel_3, 1, ADC_SampleTime_239Cycles5);


    ADC_SoftwareStartConvCmd(ADC2, ENABLE);

    ADC_Cmd(ADC2, ENABLE);


    ADC_BufferCmd(ADC2, DISABLE); //disable buffer

    ADC_ResetCalibration(ADC2);

    while(ADC_GetResetCalibrationStatus(ADC2));

    ADC_StartCalibration(ADC2);

    while(ADC_GetCalibrationStatus(ADC2));

    Calibrattion_Val2 = Get_CalibrationValue(ADC2);


    ADC_BufferCmd(ADC2, ENABLE); //enable buffer

}


/*********************************************************************

 * @fn      DMA_Tx_Init

 *

 * @brief   Initializes the DMAy Channelx configuration.

 *

 * @param   DMA_CHx - x can be 1 to 7.

 *          ppadr - Peripheral base address.

 *          memadr - Memory base address.

 *          bufsize - DMA channel buffer size.

 *

 * @return  none

 */

void DMA_Tx_Init(DMA_Channel_TypeDef *DMA_CHx, u32 ppadr, u32 memadr, u16 bufsize)

{

    DMA_InitTypeDef  DMA_InitStructure = {0};

    NVIC_InitTypeDef NVIC_InitStructure = {0};


    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);


    DMA_DeInit(DMA_CHx);

    DMA_InitStructure.DMA_PeripheralBaseAddr = ppadr;

    DMA_InitStructure.DMA_MemoryBaseAddr = memadr;

    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

    DMA_InitStructure.DMA_BufferSize = bufsize;

    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;

    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;

    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;

    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

    DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;

    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

    DMA_Init(DMA_CHx, &DMA_InitStructure);


    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);


    DMA_ITConfig(DMA1_Channel1, DMA_IT_TC | DMA_IT_HT | DMA_IT_TE, ENABLE);

}


/*********************************************************************

 * @fn      Get_ConversionVal1

 *

 * @brief   Get Conversion Value.

 *

 * @param   val - Sampling value

 *

 * @return  val+Calibrattion_Val - Conversion Value.

 */

u16 Get_ConversionVal1(s16 val)

{

    if((val + Calibrattion_Val1) < 0)

        return 0;

    if((Calibrattion_Val1 + val) > 4095)

        return 4095;

    return (val + Calibrattion_Val1);

}


/*********************************************************************

 * @fn      Get_ConversionVal2

 *

 * @brief   Get Conversion Value.

 *

 * @param   val - Sampling value

 *

 * @return  val+Calibrattion_Val - Conversion Value.

 */

u16 Get_ConversionVal2(s16 val)

{

    if((val + Calibrattion_Val2) < 0)

        return 0;

    if((Calibrattion_Val2 + val) > 4095)

        return 4095;

    return (val + Calibrattion_Val2);

}


/*********************************************************************

 * @fn      main

 *

 * @brief   Main program.

 *

 * @return  none

 */

int main(void)

{

    USART_Printf_Init(115200);

    Delay_Init();

    printf("SystemClk:%d\r\n", SystemCoreClock);

    ADC_Function_Init();

    printf("CalibrattionValue1:%d\n", Calibrattion_Val1);

    printf("CalibrattionValue2:%d\n", Calibrattion_Val2);


    DMA_Tx_Init(DMA1_Channel1, (u32)&ADC1->RDATAR, (u32)TxBuf, 1);

    DMA_Cmd(DMA1_Channel1, ENABLE);


    while(1)

    {

        ADC_SoftwareStartConvCmd(ADC1, ENABLE);


        Delay_Ms(500);

    }

}


/*********************************************************************

 * @fn      DMA1_Channel1_IRQHandler

 *

 * @brief   DMA1_Channel1_IRQHandler Interrupt Service Function.

 *

 * @return  none

 */

void DMA1_Channel1_IRQHandler()

{

    if(DMA_GetITStatus(DMA1_IT_TC1) == SET)

    {

        DMA_ClearITPendingBit(DMA1_IT_GL1);


        Adc_Val[0] = TxBuf[0] & 0xffff;

        Adc_Val[1] = (TxBuf[0] >> 16) & 0xffff;

        printf("ADC1 ch2=%d\r\n", Adc_Val[0]);

        printf("ADC2 ch3=%d\r\n", Adc_Val[1]);

    }

}


您好,CH32V208系列仅有一个ADC1,因此不能用双ADC模式


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