STM32F030 ADC驱动

bfbm · 发表于 2020-11-24 17:48:50

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#include "ADC1.h"

unsigned short AD[4]; //12位AD

//函数功能：初始化ADC
void ADC1_DMA_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef    DMA_InitStructure;
ADC_InitTypeDef    ADC_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); //配置IO时钟

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 , ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);

ADC_DeInit(ADC1); //ADC恢复默认设置

DMA_DeInit(DMA1_Channel1);                                              /* DMA1 Channel1 Config */
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address; //外设地址
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)AD; //内存地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;                      //外设作为数据传输的来源
DMA_InitStructure.DMA_BufferSize = 4;                                  //DMA连续传输数据的个数
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;       //外设地址寄存器不变
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                   //内存地址寄存器不变
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//数据宽度为16位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;          //数据宽度为16位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;                         //DMA_Priority设定DMA通道x的软件优先级
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;                               //DMA通道x没有设置为内存到内存传输
DMA_Init(DMA1_Channel1, &DMA_InitStructure);

DMA_Cmd(DMA1_Channel1, ENABLE);                         /* DMA1 Channel1 enable */
ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);    /* Enable ADC_DMA */
ADC_DMACmd(ADC1, ENABLE);

ADC_StructInit(&ADC_InitStructure);                      //初始化ADC结构

ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //12位精度
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;       //规定模式装换工作在连续模式
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;             //数据对其为右对齐
ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Backward;    //ADC的扫描方向
ADC_Init(ADC1, &ADC_InitStructure);

//前面开启的DMA连续传输数据的个数和这里开启的转换通道个数有关系，对应开启下面两个通道，连续传输数据的个数也为两个
ADC_ChannelConfig(ADC1, ADC_Channel_0|ADC_Channel_1|ADC_Channel_2|ADC_Channel_3 , ADC_SampleTime_239_5Cycles);       //对通道1的输入进行AD转换

ADC_GetCalibrationFactor(ADC1);                /* ADC Calibration */
ADC_Cmd(ADC1, ENABLE);                         /* Enable ADCperipheral[PerIdx] */
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));  /* Wait the ADCEN falg */
ADC_StartOfConversion(ADC1);                   /* ADC1 regular Software Start Conv */

}