ADC實驗：STM32+HAL+CubeMX

1 步驟：

1.1 初始化ADC

ADC_HandleTypeDef hadc1;

void MX_ADC1_Init(void)
{
  ADC_ChannelConfTypeDef sConfig = {0};

  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;  //四分頻，ADCCLK=PCLK2/4
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;  //12位模式
  hadc1.Init.ScanConvMode = DISABLE;  //非掃描模式
  hadc1.Init.ContinuousConvMode = DISABLE;  //非連續轉換模式
  hadc1.Init.DiscontinuousConvMode = DISABLE;  //禁止不連續采樣模式
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;  //使用軟件觸發
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;  //軟件觸發
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;  //右對齊（推薦）
  hadc1.Init.NbrOfConversion = 1; //1個轉換在規則序列中
  hadc1.Init.DMAContinuousRequests = DISABLE;  //關閉DMA請求
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;  //關閉EOC中斷
    
  HAL_ADC_Init(&hadc1);  //初始化

1.2 配置ADC底層驅動，配置引腳

void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{

  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(adcHandle->Instance==ADC1)  //判斷是否為ADC1
  {
    __HAL_RCC_ADC1_CLK_ENABLE();  //使能ADC1時鍾
    __HAL_RCC_GPIOA_CLK_ENABLE();  //開啟GPIOA時鍾

    GPIO_InitStruct.Pin = GPIO_PIN_5;  //PA5
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; //模擬
    GPIO_InitStruct.Pull = GPIO_NOPULL;  //不帶上下拉
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    HAL_NVIC_SetPriority(ADC_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(ADC_IRQn);
  }
}

1.3 配置通道，讀取ADC值

uint16_t Get_ADC(uint32_t channel)
{
    ADC_ChannelConfTypeDef sConfig = {0};
    
    sConfig.Channel = channel;  //通道，取值范圍ADC_CHANNEL_0～ADC_CHANNEL_16
  sConfig.Rank = 1; //第1個序列，序列1
  sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;  //采樣時間
    HAL_ADC_ConfigChannel(&hadc1, &sConfig);
    
    HAL_ADC_Start(&hadc1);  //開啟ADC
    HAL_ADC_PollForConversion(&hadc1,10); //輪詢轉換
    return (uint16_t)HAL_ADC_GetValue(&hadc1);  //返回最近轉換結果
}

1.4 在main函數中調用Get_ADC(uint32_t channel)

2 使用CubeMX配置