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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例程，先做ADC校準、然后再設置DMA，再使能ADC的DMA。
/*********************************************************************************************************/
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恢復默認設置
? ? 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之后
? ? 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; //內存地址
? ? 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; //內存地址寄存器不變
? ? 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的軟件優先級
? ? DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMA通道x沒有設置為內存到內存傳輸
? ? 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 */
}
/************************************ END ***********************************************/
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