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]);
}
}
