記STM32F030多通道ADC DMA讀取亂序問題

• 問題描述
  通過 uint16_t ConvData[8]保存DMA搬運的ADC轉換數值，但是這個數組數值的順序總是和ADC不是順序對應的。比如用7個通道的ADC，當設置ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Backward，是對應順序是：0->0,1->7,2->6…7->1 ； 當設置ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward，是對應順序是：0->7,1->0,2->1…7->6 。
• 問題原因
  F0的ADC在使用之前需要校準。這個7位的校準值也是放在ADC_DR中的，它也會觸發DMA請求。
  可以參照F0的ADC-DMA常式，先做ADC校準、然後再設置DMA，再使能ADC的DMA。
• 實例代碼

void ADC1_DMA_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    DMA_InitTypeDef DMA_InitStructure;
    ADC_InitTypeDef ADC_InitStructure;

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = 0x00ff;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    ADC_DeInit(ADC1); //ADC恢復預設設置

    ADC_StructInit(&ADC_InitStructure); //初始化ADC結構

    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //12位精度
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //規定模式裝換工作在連續模式
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //數據對其為右對齊
    ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward; // ADC_ScanDirection_Backward; //ADC的掃描方向
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_ChannelConfig(ADC1, ADC_Channel_0, ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */
    ADC_ChannelConfig(ADC1, ADC_Channel_1, ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */
    ADC_ChannelConfig(ADC1, ADC_Channel_2, ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */
    ADC_ChannelConfig(ADC1, ADC_Channel_3, ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */
    ADC_ChannelConfig(ADC1, ADC_Channel_4, ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */
    ADC_ChannelConfig(ADC1, ADC_Channel_5, ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */
    ADC_ChannelConfig(ADC1, ADC_Channel_6, ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */
    ADC_ChannelConfig(ADC1, ADC_Channel_7, ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */

    ADC_GetCalibrationFactor(ADC1); /* ADC Calibration */
    ADC_Cmd(ADC1, ENABLE); /* Enable ADCperipheral[PerIdx] */
    while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY))
        ; /* Wait the ADCEN falg */

    //設置DMA要在校準ADC之後

    DMA_DeInit(DMA1_Channel1); /* DMA1 Channel1 Config */
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) 0x40012440; //ADC1->DR; //外設地址
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) RegularConvData_Tab; //記憶體地址
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //外設作為數據傳輸的來源
    DMA_InitStructure.DMA_BufferSize = 8; //
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外設地址寄存器不變
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //記憶體地址寄存器不變
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //數據寬度為16位
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //數據寬度為16位
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA_Priority設定DMA通道x的軟體優先順序
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMA通道x沒有設置為記憶體到記憶體傳輸
    DMA_Init(DMA1_Channel1, &DMA_InitStructure);

    DMA_Cmd(DMA1_Channel1, ENABLE);/* DMA1 Channel1 enable */
    DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
    ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular); /* Enable ADC_DMA */
    ADC_DMACmd(ADC1, ENABLE);

    ADC_StartOfConversion(ADC1); /* ADC1 regular Software Start Conv */

}