STM32 HAL库之DMA模式ADC

• HAL_ADC_Init()
  用户自行调用 加载ADC属性

//ADC句柄声明 
ADC_HandleTypeDef AdcHandle;

AdcHandle.Instance = ADC1;

AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
AdcHandle.Init.LowPowerAutoWait = DISABLE;
AdcHandle.Init.LowPowerAutoPowerOff = DISABLE;
AdcHandle.Init.Resolution = ADC_RESOLUTION_10B;
AdcHandle.Init.ScanConvMode = ADC_SCAN_ENABLE;               //扫描模式
AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;              //右对齐
AdcHandle.Init.ContinuousConvMode = DISABLE;                 //不连续转换
AdcHandle.Init.DiscontinuousConvMode = DISABLE;              //禁止不连续采样模式
AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;        //软件触发
AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;//外部触发规则
AdcHandle.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
AdcHandle.Init.DMAContinuousRequests = DISABLE;              //DMA转换请求，指定DMA执行单次（当转换数达标时停止传送）or连续请求模式；备注：连续模式：
//DMA必须配置为循环模式，否则当DMA buffer存满时将触发溢出； ENABLE or DISABLE
AdcHandle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;           //选择数据溢出时的行为：保存数据或覆盖数据；这个参数只作用于规则组，包含DMA

//根据传递的参数初始化ADC外设 
 if (HAL_ADC_Init(&AdcHandle) != HAL_OK)
 {
     Error_Handler();
 }

• HAL_ADCEx_Calibration_Start()
  自动校准ADC，调用即可

 //开始校准
 if (HAL_ADCEx_Calibration_Start(&AdcHandle) != HAL_OK)
 {
     Error_Handler();
 }

• HAL_ADC_ConfigChannel()
  外设控制函数，动态配置外设参数，以下为配置规则组通道

//ADC通道配置结构声明 
ADC_ChannelConfTypeDef sConfig;

//频道配置
//选择要转换的通道0
sConfig.Channel = ADC_CHANNEL_VBAT;                         //通道
sConfig.Rank = ADC_RANK_NONE; 
sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
if (HAL_ADC_ConfigChannel(&AdcHandle, &sConfig) != HAL_OK)
{
    Error_Handler();
}

自定义初始化

• HAL_ADC_MspInit()
  由HAL_ADC_Init()调用，对底层初始化，主要包括时钟，IO，DMA等,以下函数为DMA配置

void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc)
{
	static DMA_HandleTypeDef DmaHandle;
 	//启用外设和GPIO时钟
    //使能ADC1 Periph时钟
    __HAL_RCC_ADC1_CLK_ENABLE();
    //启用DMA1时钟
    __HAL_RCC_DMA1_CLK_ENABLE();

	//配置DMA参数
	DmaHandle.Instance = DMA1_Channel1;
    DmaHandle.Init.Direction = DMA_PERIPH_TO_MEMORY;
    DmaHandle.Init.PeriphInc = DMA_PINC_DISABLE;
    DmaHandle.Init.MemInc = DMA_MINC_ENABLE;
    DmaHandle.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
    DmaHandle.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
    DmaHandle.Init.Mode = DMA_CIRCULAR;
    DmaHandle.Init.Priority = DMA_PRIORITY_LOW;


	//取消初始化和初始化DMA以进行新的传输
    HAL_DMA_DeInit(&DmaHandle);
    HAL_DMA_Init(&DmaHandle);

    //关联DMA句柄 
    __HAL_LINKDMA(hadc, DMA_Handle, DmaHandle);

    //DMA输入数据中断的NVIC配置
    HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 3, 0);
    HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);


}

中断

//stm32f0xx_it.c
extern ADC_HandleTypeDef AdcHandle;
extern volatile bool batteryLevelReady;

void DMA1_Channel1_IRQHandler(void)
{
    HAL_DMA_IRQHandler(AdcHandle.DMA_Handle);
    batteryLevelReady = true;
}

用户逻辑

DMA模式，激活ADC外设:

• HAL_ADC_Start_DMA()

uint32_t batteryLevel;
void startReadBatteryLevel()
{
    //在DMA模式下开始转换
    if (isSensorsInitialized)
    {
        if (HAL_ADC_Start_DMA(&AdcHandle, &batteryLevel, 1) != HAL_OK)
        {
            Error_Handler();
        }
    }
}

volatile bool batteryLevelReady = false;

uint32_t getBatteryLevel()
{
	batteryLevelReady =  false;
    return batteryLevel;
}

参考

参考：https://www.cnblogs.com/cat-li/p/4982510.html
https://www.cnblogs.com/sovagxa/p/9064746.html