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如题:我用030C8T6 的DMA 通道1(默认) 做ADC转换结果,可以正常得到想要的数值。但是把通道1改成通道2,重映射也改了,但是没反应,代码如下:
#define ADC1_DR_Address ((uint32_t)0x40012440) //((unsigned long)0x4001244C)
void DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
DMA_DeInit(DMA1_Channel2);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&Adc.wAdcValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 2;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);
DMA_RemapConfig(DMA1, DMA1_CH2_ADC); // 增加这两条重映射,但是都没反应
SYSCFG_DMAChannelRemapConfig(SYSCFG_DMARemap_ADC1,ENABLE);
DMA_Cmd(DMA1_Channel2, ENABLE);
}
void ADC_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
RCC_ADCCLKConfig(RCC_ADCCLK_PCLK_Div4);
ADC_DeInit(ADC1);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_ChannelConfig(ADC1 , ADC_Channel_0 ,ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1 , ADC_Channel_1 ,ADC_SampleTime_239_5Cycles);
ADC_GetCalibrationFactor(ADC1);
ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);
ADC_DMACmd(ADC1,ENABLE);
ADC_Cmd(ADC1 , ENABLE);
ADC_StartOfConversion(ADC1);
}
void AdcInitial(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
DMA_Configuration();
ADC_Configuration();
}
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