CH32V003多路ADC的DMA采用

`#include “debug.h”

/* Global Variable */
u16 TxBuf[15];

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

• @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_GPIOD, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  RCC_ADCCLKConfig(RCC_PCLK2_Div8);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  ADC_DeInit(ADC1);
  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;//DISABLE;//使能扫描
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//转换工作在连续转换模式
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;//外部触发转换关闭
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC数据右对齐
  ADC_InitStructure.ADC_NbrOfChannel = 3;
  ADC_Init(ADC1, &ADC_InitStructure);

  ADC_Calibration_Vol(ADC1, ADC_CALVOL_50PERCENT);
  ADC_DMACmd(ADC1, ENABLE);
  ADC_Cmd(ADC1, ENABLE);

  ADC_ResetCalibration(ADC1);
  while(ADC_GetResetCalibrationStatus(ADC1));
  ADC_StartCalibration(ADC1);
  while(ADC_GetCalibrationStatus(ADC1));
  }

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

• @fn Get_ADC_Val

• @brief Returns ADCx conversion result data.

• @param ch - ADC channel.

•        ADC_Channel_0 - ADC Channel0 selected.
  

•        ADC_Channel_1 - ADC Channel1 selected.
  

•        ADC_Channel_2 - ADC Channel2 selected.
  

•        ADC_Channel_3 - ADC Channel3 selected.
  

•        ADC_Channel_4 - ADC Channel4 selected.
  

•        ADC_Channel_5 - ADC Channel5 selected.
  

•        ADC_Channel_6 - ADC Channel6 selected.
  

•        ADC_Channel_7 - ADC Channel7 selected.
  

•        ADC_Channel_8 - ADC Channel8 selected.
  

•        ADC_Channel_9 - ADC Channel9 selected.
  

• @return none
  */
  u16 Get_ADC_Val(u8 ch)
  {
  u16 val;

  ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_241Cycles);
  ADC_SoftwareStartConvCmd(ADC1, ENABLE);

  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
  val = ADC_GetConversionValue(ADC1);

  return val;
  }

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

• @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};

  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;//外设地址寄存器不变 源地址不变
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;// 内存地址寄存器递增 目标地址加1
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//工作在循环缓存模式/Normal正常转换
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA_CHx, &DMA_InitStructure);
  }

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

• @fn main

• @brief Main program.

• @return none
  */
  int main(void)
  {
  u16 i;
  SystemCoreClockUpdate();
  Delay_Init();
  #if (SDI_PRINT == SDI_PR_OPEN)
  SDI_Printf_Enable();
  #else
  USART_Printf_Init(115200);
  #endif
  printf(“SystemClk:%d\r\n”, SystemCoreClock);
  printf( “ChipID:%08x\r\n”, DBGMCU_GetCHIPID() );

  ADC_Function_Init();

  DMA_Tx_Init(DMA1_Channel1, (u32)&ADC1->RDATAR, (u32)TxBuf, 15);
  DMA_Cmd(DMA1_Channel1, ENABLE);

  ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_241Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_241Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 3, ADC_SampleTime_241Cycles);
  ADC_SoftwareStartConvCmd(ADC1, ENABLE);
  Delay_Ms(50);
  ADC_SoftwareStartConvCmd(ADC1, DISABLE);

  for(i = 0; i < 15; i++){
  printf(“%04d\r\n”, TxBuf[i]);
  Delay_Ms(10);
  }

  while(1);
  }