Stm32f4 ll library multi-channel ADC

One 、 Reference resources

1. Refer to this big man ：https://blog.csdn.net/qq_45100839/article/details/114399506

Two 、 step

contrast STM32F0,ADC We need to add Number Of Conversion Configuration of , Then some other configurations are rarely different

1. ADC To configure , I am here 2 Channels
   
   

2. DMA To configure
   

3. I don't use interrupts here , Direct query waiting , You can refer to the link reference above to add an interrupt

4. Add code

   void adc_dma_init()
   {
         
   /* Set DMA transfer addresses of source and destination */
   	LL_DMA_ConfigAddresses(DMA2,
   						   LL_DMA_STREAM_0,
   						   LL_ADC_DMA_GetRegAddr(ADC1, LL_ADC_DMA_REG_REGULAR_DATA),
   						   (uint32_t)&adcBuf,
   						   LL_DMA_DIRECTION_PERIPH_TO_MEMORY);// To configure DMA, take DMA And ADC1 Link together 
    
   	/* Set DMA transfer size */
   	LL_DMA_SetDataLength(DMA2,LL_DMA_STREAM_0,ADC_DMA_BUF_SIZE);// Set up DMA The length of , With storage ADC The value array is equal in length 
    
   	/* Enable the DMA transfer */
   	LL_DMA_EnableStream(DMA2,LL_DMA_STREAM_0);// Can make DMA transmission 
    
   	LL_ADC_Enable(ADC1);// open ADC
    
   	/* Start ADC group regular conversion */
   	LL_ADC_REG_StartConversionSWStart(ADC1);// start-up ADC Group general conversion ,SWStart  And cubmx Configuration in progress  ADCs_Regular_ConversionMode  Of  External Trigger Conversion Source ADC Corresponding 
    
   	LL_ADC_REG_SetDMATransfer(ADC1,LL_ADC_REG_DMA_TRANSFER_UNLIMITED);// Start conversion 
       
   }
   
   
   ///> adc  Some macro definitions 
   #define ADC_DMA_BUF_CH 2 /*  altogether 2 Channels  */
   #define ADC_DMA_BUF_LEN 8 /*  Every channel 8 A data cache  */
   #define ADC_DMA_BUF_SIZE (ADC_DMA_BUF_LEN*ADC_DMA_BUF_CH) /*  total BUF size  */
   uint8_t adc_get( uint16_t *adc_data_buf)
   {
         
       if ( LL_DMA_IsActiveFlag_TC0(DMA2) )
       {
         
           uint16_t i,j;
           uint16_t * tadBuf;
   
           tadBuf = & adcBuf[0];
   
           for(i = 0; i < ADC_DMA_BUF_CH; i++)
           {
         
               tAD[i] = 0;
           }
   
           for(i = 0; i < ADC_DMA_BUF_CH; i++)
           {
         
               for(j = 0; j < ADC_DMA_BUF_LEN; j++)
               {
         
                   tAD[i] = tAD[i] + tadBuf[j*ADC_DMA_BUF_CH + i];
               }
               tAD[i] = tAD[i] / ADC_DMA_BUF_LEN;
           }
   
           memcpy(adc_data_buf,tAD,ADC_DMA_BUF_CH*2);  /*  Be careful memcpy  Or in accordance with 8 position copy  So we need to *2 Conduct copy */
           
           return 1;
       }
       return 0;
   }