STM32f103------ADC（DMA）
STM32F10x ADC 技术指标：
分辨率： 12位分辨率 LSB=Vref+ / 2^(12)
转换时间： 采样一次至少14个ADC时钟周期 ，而ADC最高时钟周期为14MHz 选用采样周期=1.5+12.5。最短采样时间为1us.
ADC类型 :逐次比较式.
参考电压范围：2.4V≤Vref+≤3.6V
#define ADC1_DR_Address ((u32)0x4001244C)
void ADC_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);//Enable DMA clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);//Enable ADC1,GPIOA，AFIO Clock
/* Configure PA.06 (ADC Channel6), PA.07 (ADC Channel7) as analog input -------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //speed of GPIO
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; // analog input
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* DMA channel1 configuration ----------------------------------------------*/
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 1;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
/* Enable DMA1 channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* ADC1 configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;//独立扫描
ADC_InitStructure.ADC_ScanConvMode = ENABLE;//多通道扫描模式
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//连续数模转化使能
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;//定义触发方式 转换是由软件而不是外部触发启动
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//数据为右对齐方式
ADC_InitStructure.ADC_NbrOfChannel = 1;//规定了顺序进行规则转换的ADC通道数目
ADC_Init(ADC1, &ADC_InitStructure);//
/* ADC1 regular channel6 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 1, ADC_SampleTime_239Cycles5);//采样通道6 采样时间为239.5周期+12.5=252
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Enable ADC1 reset calibaration register */
ADC_ResetCalibration(ADC1);// 重置指定的ADC的校准寄存器
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));
/* Start ADC1 calibaration */
ADC_StartCalibration(ADC1);
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);//ʹÄÜADCµÄÈí¼þʹÄÜ
}