[嵌入式]STM32 ADC模数转换

STM32 ADC模数转换

独立模式/双重DMA/三重DMA

//使能ADC时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
//APB2时钟为72MHz
//ADCCLK时钟最大为14MHz
//设置ADC分频因子6 72M/6=12MHz
RCC_ADCCLKConfig(RCC_PCLK2_Div6);

ADC_DeInit(ADC1);                                                 //复位ADC1
ADC_InitStruct.ADC_Mode = ADC_Mode_Independent;                   //独立模式
ADC_InitStruct.ADC_ScanConvMode = ENABLE;                         //多通道使能
ADC_InitStruct.ADC_ContinuousConvMode = ENABLE;                   //连续转换模式
ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;  //软件触发
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;               //数据右对齐
ADC_InitStruct.ADC_NbrOfChannel = 7;                              //6通道
ADC_Init(ADC1, &ADC_InitStruct);

//配置ADC转换顺序和采样周期
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 3, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 4, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 5, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 6, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 7, ADC_SampleTime_239Cycles5);
//使能软件触发
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
//使能DMA
ADC_DMACmd(ADC1, ENABLE);
//使能ADC
ADC_Cmd(ADC1, ENABLE);
//复位ADC
ADC_ResetCalibration(ADC1);
//获取ADC重置校准寄存器的状态 等待复位结束
while (ADC_GetResetCalibrationStatus(ADC1));
//开始指定ADC的校准状态
ADC_StartCalibration(ADC1);

while (ADC_GetCalibrationStatus(ADC1));

ADC_ExternalTrigConvCmd(ADC1, ENABLE);