摘要：
问题描述通过uint16_tConvData[8]保存DMA搬运的ADC转换数值，但是这个数组数值的顺序总是和ADC不是顺序对应的。7-˃1；当设置ADC_InitStructure.ADC_ScanDirection=ADC_ScanDirection_Upward，是对应顺序是：0-˃7,1-˃0,2-˃1…这个7位的校准值也是放在ADC_DR中的，它也会触发DMA请求。可以参照F0的ADC-DMA例程，先做ADC校准、然后再设置DMA，再使能ADC的DMA。
- 问题描述
通过 uint16_t ConvData[8]保存DMA搬运的ADC转换数值，但是这个数组数值的顺序总是和ADC不是顺序对应的。比如用7个通道的ADC，当设置ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Backward，是对应顺序是：0->0,1->7,2->6…7->1 ； 当设置ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward，是对应顺序是：0->7,1->0,2->1…7->6 。 - 问题原因
F0的ADC在使用之前需要校准。这个7位的校准值也是放在ADC_DR中的，它也会触发DMA请求。
可以参照F0的ADC-DMA例程，先做ADC校准、然后再设置DMA，再使能ADC的DMA。 - 实例代码
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恢复默认设置 ADC_StructInit(&ADC_InitStructure); //初始化ADC结构 ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //12位精度 ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //规定模式装换工作在连续模式 ADC_InitStructure.ADC_ExternalTrigConvEdge =ADC_ExternalTrigConvEdge_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //数据对其为右对齐 ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward; //ADC_ScanDirection_Backward; //ADC的扫描方向 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 */ //设置DMA要在校准ADC之后
DMA_DeInit(DMA1_Channel1); /*DMA1 Channel1 Config */DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) 0x40012440; //ADC1->DR; //外设地址 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) RegularConvData_Tab; //内存地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //外设作为数据传输的来源 DMA_InitStructure.DMA_BufferSize = 8; // DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址寄存器不变 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //数据宽度为16位 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //数据宽度为16位 DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA_Priority设定DMA通道x的软件优先级 DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMA通道x没有设置为内存到内存传输 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 */ }