ADC多路通道转换

一个ADC有16个外部模拟输入通道，外加温度传感器，参考电压，备份电压三个片内通道。在扫描模式下，一个ADC可以按顺序采样多个信号源，最大化利用ADC。

↓↓配置四路ADC转换

ADC_HandleTypeDef h_ADC1;
ADC_ChannelConfTypeDef h_ADC1_Channel_Init;
void ADC_Init(void)
{
    /*ADC配置*/
    __HAL_RCC_ADC1_CLK_ENABLE();
    h_ADC1.Instance = ADC1;
    h_ADC1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV8;//ADC_CCR_ADCPRE
    h_ADC1.Init.Resolution = ADC_RESOLUTION_12B;//ADC_CR1_RES
    h_ADC1.Init.DataAlign = ADC_DATAALIGN_RIGHT;//ADC_CR2_ALIGN
    h_ADC1.Init.ScanConvMode = ENABLE;//ADC_CR1_SCAN
    h_ADC1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;//ADC_CR2_EOCS
    h_ADC1.Init.ContinuousConvMode = ENABLE;//ADC_CR2_CONT
    h_ADC1.Init.NbrOfConversion = 4;//ADC_SQR1_L
    h_ADC1.Init.DiscontinuousConvMode = DISABLE;//ADC_CR1_DISCEN
    h_ADC1.Init.NbrOfDiscConversion = 0;//ADC_CR1_DISCNUM
    h_ADC1.Init.ExternalTrigConv = ADC_SOFTWARE_START;//ADC_CR2_EXTSEL
    h_ADC1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;//ADC_CR2_EXTEN
    h_ADC1.Init.DMAContinuousRequests = DISABLE;//ADC_CR2_DDS
    HAL_ADC_Init(&h_ADC1);
    /*ADC通道配置*/
    h_ADC1_Channel_Init.Channel = ADC_CHANNEL_1;
    h_ADC1_Channel_Init.Rank = 1;
    h_ADC1_Channel_Init.SamplingTime = ADC_SAMPLETIME_480CYCLES;
    HAL_ADC_ConfigChannel(&h_ADC1,&h_ADC1_Channel_Init);
    h_ADC1_Channel_Init.Channel = ADC_CHANNEL_2;
    h_ADC1_Channel_Init.Rank = 2;
    h_ADC1_Channel_Init.SamplingTime = ADC_SAMPLETIME_480CYCLES;
    HAL_ADC_ConfigChannel(&h_ADC1,&h_ADC1_Channel_Init);    
    h_ADC1_Channel_Init.Channel = ADC_CHANNEL_4;
    h_ADC1_Channel_Init.Rank = 3;
    h_ADC1_Channel_Init.SamplingTime = ADC_SAMPLETIME_480CYCLES;
    HAL_ADC_ConfigChannel(&h_ADC1,&h_ADC1_Channel_Init);    
    h_ADC1_Channel_Init.Channel = ADC_CHANNEL_6;
    h_ADC1_Channel_Init.Rank = 4;
    h_ADC1_Channel_Init.SamplingTime = ADC_SAMPLETIME_480CYCLES;
    HAL_ADC_ConfigChannel(&h_ADC1,&h_ADC1_Channel_Init);
    /*ADC通道引脚配置*/
    __HAL_RCC_GPIOA_CLK_ENABLE();
    GPIO_InitTypeDef GPIO_Init;
    GPIO_Init.Pin  = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_4 | GPIO_PIN_6;
    GPIO_Init.Mode = GPIO_MODE_ANALOG;
    GPIO_Init.Pull = GPIO_NOPULL;
    GPIO_Init.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    HAL_GPIO_Init(GPIOA,&GPIO_Init);
}
/*获取ADC采样值*/
uint32_t ADC1_Start_GetValue(void)
{
    HAL_ADC_Start(&h_ADC1);
    HAL_ADC_PollForConversion(&h_ADC1,20);
    return HAL_ADC_GetValue(&h_ADC1);
}

↓四路通道ADC采样结果