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 pos
- void 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__);
- }
- }
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);
- }
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;
- }
作者: southcreek, 来源:面包板社区
链接: https://mbb.eet-china.com/blog/uid-me-408807.html
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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.