STM32 ADC 同步规则模式 ADC1与ADC2同用一个DMA

在同步模式下， ADC1 和 ADC2 同步采样的两个通道的需要设置为准确的相同采样时间







来个应用例子吧：



// ADC1 做电流检实时检测

 ADC_DeInit(ADC1,&ADC_InitStructure);

 ADC_InitStructure.ADC_Mode = ADC_MODE_REGSIMULT;

    ADC_InitStructure.ADC_Mode_Scan = ENABLE;                                 // 开启多通道扫描模式

    ADC_InitStructure.ADC_Mode_Continuous = ENABLE;                             // 连续模式

    ADC_InitStructure.ADC_Trig_External = ADC_EXTERNAL_TRIGGER_MODE_NONE;  

    ADC_InitStructure.ADC_Data_Align = ADC_DATAALIGN_RIGHT; 

    ADC_InitStructure.ADC_Channel_Number = 4;  

    ADC_Init(ADC1,&ADC_InitStructure); 

 ADC_RegularChannel_Config (ADC1,ADC_CHANNEL_2, 1, ADC_SAMPLETIME_7POINT5 );  // I 

 ADC_RegularChannel_Config (ADC1,ADC_CHANNEL_2, 2, ADC_SAMPLETIME_7POINT5 );  // I 

 ADC_RegularChannel_Config (ADC1,ADC_CHANNEL_2, 3, ADC_SAMPLETIME_7POINT5 );  // I 

 ADC_RegularChannel_Config (ADC1,ADC_CHANNEL_2, 4, ADC_SAMPLETIME_7POINT5 );  // I 

 

 





 // ADC2 做电流峰值，位置，温度，电压等检测

    ADC_DeInit(ADC2,&ADC_InitStructure);

 ADC_InitStructure.ADC_Mode = ADC_MODE_REGSIMULT;

    ADC_InitStructure.ADC_Mode_Scan = ENABLE;                                 // 开启多通道扫描模式

    ADC_InitStructure.ADC_Mode_Continuous = ENABLE;                             // 连续模式

    ADC_InitStructure.ADC_Trig_External = ADC_EXTERNAL_TRIGGER_MODE_NONE;  

    ADC_InitStructure.ADC_Data_Align = ADC_DATAALIGN_RIGHT; 

    ADC_InitStructure.ADC_Channel_Number = 4;  

    ADC_Init(ADC2,&ADC_InitStructure);  

 ADC_RegularChannel_Config (ADC2,ADC_CHANNEL_1, 1, ADC_SAMPLETIME_7POINT5 );  // I-PEAK

 ADC_RegularChannel_Config (ADC2,ADC_CHANNEL_3, 2, ADC_SAMPLETIME_7POINT5 );  // POS 

 ADC_RegularChannel_Config (ADC2,ADC_CHANNEL_4, 3, ADC_SAMPLETIME_7POINT5 );  // NTC



 ADC_RegularChannel_Config (ADC2,ADC_CHANNEL_5, 4, ADC_SAMPLETIME_7POINT5 );  // VDC







DMA_DeInit(DMA1_CHANNEL1); 

   DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_RDTR_ADDRESS; 

    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)(Adc12Result); 

    DMA_InitStructure.DMA_DIR = DMA_DIR_PERIPHERALSRC;  

    DMA_InitStructure.DMA_BufferSize = BuffSize; 

    DMA_InitStructure.DMA_PeripheralInc = DMA_PERIPHERALINC_DISABLE; 

    DMA_InitStructure.DMA_MemoryInc = DMA_MEMORYINC_ENABLE; 

    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PERIPHERALDATASIZE_WORD; 

    DMA_InitStructure.DMA_MemoryDataSize = DMA_MEMORYDATASIZE_WORD; 

    DMA_InitStructure.DMA_Mode = DMA_MODE_CIRCULAR; 

    DMA_InitStructure.DMA_Priority = DMA_PRIORITY_MEDIUM;

    DMA_InitStructure.DMA_MTOM = DMA_MEMTOMEM_DISABLE;

    DMA_Init(DMA1_CHANNEL1, &DMA_InitStructure);  



。。。。



ADC_SoftwareStartConv_Enable(ADC1,ENABLE); 

ADC_SoftwareStartConv_Enable(ADC2,ENABLE);



这样DMA就直接读取到两个ADC同步转换的结果了。