STM32實作ADC的DMA配置，已測試通過

#define ADC1_DR_Address ((u32)0x40012400+0x4c)

void ADC1_Init(void)

{

ADC1_GPIO_Config(); //端口初始化

ADC1_Mode_Config(); //DMA配置

}

static void ADC1_GPIO_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

GPIO_Init(GPIOA, &GPIO_InitStructure); // PA6,輸入時不用設定速率

}

static void ADC1_Mode_Config(void)

{

DMA_InitTypeDef DMA_InitStructure;

ADC_InitTypeDef ADC_InitStructure;

DMA_DeInit(DMA1_Channel1);

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address; //ADC位址

DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;//記憶體位址變為數組首位址

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize = 1; //要傳輸1個資料

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外設位址固定

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable; //記憶體位址固定

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //半字

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //循環傳輸

DMA_InitStructure.DMA_Priority = DMA_Priority_High;

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA1_Channel1, &DMA_InitStructure);

DMA_Cmd(DMA1_Channel1, ENABLE);

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //獨立ADC模式

ADC_InitStructure.ADC_ScanConvMode = DISABLE ; //禁止掃描模式，掃描模式用于多通道采集

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //開啟連續轉換模式，即不停地進行ADC轉換

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //不使用外部觸發轉換

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //采集資料右對齊

ADC_InitStructure.ADC_NbrOfChannel = 1; //要轉換的通道數目1

ADC_Init(ADC1, &ADC_InitStructure);

/配置ADC時鐘，為PCLK2的8分頻，即9Hz/

RCC_PCLK2Config(RCC_HCLK_Div4); //預分頻

RCC_ADCCLKConfig(RCC_PCLK2_Div4);

ADC_DMACmd(ADC1, ENABLE);

ADC_Cmd(ADC1, ENABLE);

ADC_ResetCalibration(ADC1);

while(ADC_GetResetCalibrationStatus(ADC1));

while(ADC_GetCalibrationStatus(ADC1));

ADC_SoftwareStartConvCmd(ADC1, ENABLE);

}

——完——