使用DMA 进行AD采样很方便，但需要事先设置好通道。如果有过程中希望修改通道，可以先做一个DeInit 然后设置不同的Rank
// Adc 通道配置 选择 vdc vbat preu pred
void ADC1_misc_Init(void){ ADC_ChannelConfTypeDef sConfig; HAL_ADC_DeInit(&hadc1); /**Common config */ hadc1.Instance = ADC1; hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE; hadc1.Init.ContinuousConvMode = ENABLE; hadc1.Init.DiscontinuousConvMode = DISABLE; hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START; hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc1.Init.NbrOfConversion = 4; if (HAL_ADC_Init(&hadc1) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } /**Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_12; // bdc sConfig.Rank = ADC_REGULAR_RANK_1; sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } /**Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_13; // vbat sConfig.Rank = ADC_REGULAR_RANK_2; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } /**Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_1; // preu sConfig.Rank = ADC_REGULAR_RANK_3; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } /**Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_7; // pred sConfig.Rank = ADC_REGULAR_RANK_4; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }}// adc1 通道配置 bub posvoid ADC1_ir_Init(void){ ADC_ChannelConfTypeDef sConfig; HAL_ADC_DeInit(&hadc1); /**Common config */ hadc1.Instance = ADC1; hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE; hadc1.Init.ContinuousConvMode = ENABLE; hadc1.Init.DiscontinuousConvMode = DISABLE; hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START; hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc1.Init.NbrOfConversion = 2; if (HAL_ADC_Init(&hadc1) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } /**Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_5; // position sConfig.Rank = ADC_REGULAR_RANK_1; sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } /**Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_6; // bubble sConfig.Rank = ADC_REGULAR_RANK_2; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } }复制代码在启动转换时，依据设置的通道数，选择不同的DMA空间
void StartADC1Misc(void){
HAL_ADC_Start_DMA(&hadc1, ADC1Buf.ValMem,ADCCNT*4);}void StartADC1IR(void){HAL_ADC_Start_DMA(&hadc1, IRBuf.ValMem,ADCCNT*2);}复制代码获取采样值的时候，找到对应的缓冲区
uint32_t AdcGetValue(uint8_t ch){
uint32_t temp,i; temp = 0; for(i = ADCCNT/2-5;i< ADCCNT/2+5;i++){ temp = temp+ (ADC1Buf.Val[i][ch]&0xFFF); } temp /= 10; return temp;}uint32_t AdcGetIRValue(uint8_t ch){ uint32_t temp,i; temp = 0; for(i = ADCCNT/2-5;i< ADCCNT/2+5;i++){ temp = temp+ (IRBuf.Val[i][ch]&0xFFF); } temp /= 10; return temp;}复制代码
作者： southcreek， 来源：面包板社区
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/4 
southcreek 2021-1-17 07:38
冰点1128 2021-1-4 17:53
这两个组是有不同的功能,参见正点原子的说明.说的很详细.