STM32F303RE官方开发板ADC+DMA异常
现象为ADC1DualConvertedValue【0】与ADC1DualConvertedValue【1】数据正常ADC1DualConvertedValue【3】也就是ADC1通道4数据异常
请各位大神帮帮忙/* 宏定义 --------------------------------------------------------------------*/
#define ADC1_CDR_ADDRESS ((uint32_t)&ADC1->DR)
#define ADC2_CDR_ADDRESS ((uint32_t)&ADC2->DR)
/* 变量 ----------------------------------------------------------------------*/
extern u16 ADC1DualConvertedValue;
extern u16 ADC2DualConvertedValue;
void K_DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_CDR_ADDRESS; //Specifies the peripheral base address for DMAy Channelx.
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC1DualConvertedValue; //Specifies the memory base address for DMAy Channelx
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //Specifies if the peripheral is the source or destination
DMA_InitStructure.DMA_BufferSize = 3; //Specifies the buffer size, in data unit, of the specified Channel
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //Specifies whether the Peripheral address register is incremented or not.
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //Specifies whether the memory address register is incremented or not.
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //Specifies the Peripheral data width
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //Specifies the Memory data width.
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //Specifies the operation mode of the DMAy Channelx.
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //Specifies the software priority for the DMAy Channelx
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //Specifies if the DMAy Channelx will be used in memory-to-memory transfer.
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC2_CDR_ADDRESS;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC2DualConvertedValue;
DMA_Init(DMA2_Channel1, &DMA_InitStructure);
DMA_Cmd(DMA1_Channel1, ENABLE);
DMA_Cmd(DMA2_Channel1, ENABLE);
}
voidK_Adc_Init(void)
{
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div1); //配置ADC时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ADC12, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_3|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7; //ADC1 CH124 ADC2 CH234
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; //模拟输入引脚
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_StructInit(&ADC_InitStructure);
ADC_VoltageRegulatorCmd(ADC1, ENABLE);
ADC_VoltageRegulatorCmd(ADC2, ENABLE);
delay_ms(10);
ADC_SelectCalibrationMode(ADC1, ADC_CalibrationMode_Single);
ADC_StartCalibration(ADC1);
ADC_SelectCalibrationMode(ADC2, ADC_CalibrationMode_Single);
ADC_StartCalibration(ADC2);
while(ADC_GetCalibrationStatus(ADC1) != RESET );
//calibration_value_1 = ADC_GetCalibrationValue(ADC1);
while(ADC_GetCalibrationStatus(ADC2) != RESET );
//calibration_value_2 = ADC_GetCalibrationValue(ADC2);
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //ADC independent mode
ADC_CommonInitStructure.ADC_Clock = ADC_Clock_SynClkModeDiv1; //Synchronous clock mode divided by 1
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1; //DMA12~10位分辨率
ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_Circular; //DMA连续模式
ADC_CommonInitStructure.ADC_TwoSamplingDelay = 2; //采样延迟0~f
ADC_CommonInit(ADC1, &ADC_CommonInitStructure);
ADC_CommonInit(ADC2, &ADC_CommonInitStructure);
ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Enable; //连续转换
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //12位精度
ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_0; //ADC external trigger event 0
ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_None; //ADC No external trigger for regular conversion
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC Data alignment right
ADC_InitStructure.ADC_OverrunMode = ADC_OverrunMode_Disable; //ADC Overrun Mode disable
ADC_InitStructure.ADC_AutoInjMode = ADC_AutoInjec_Disable; //ADC Auto injected Mode disable
ADC_InitStructure.ADC_NbrOfRegChannel = 3;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_Init(ADC2, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_1Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_1Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 3, ADC_SampleTime_1Cycles5);
ADC_RegularChannelConfig(ADC2, ADC_Channel_2, 1, ADC_SampleTime_1Cycles5);
ADC_RegularChannelConfig(ADC2, ADC_Channel_3, 2, ADC_SampleTime_1Cycles5);
ADC_RegularChannelConfig(ADC2, ADC_Channel_4, 3, ADC_SampleTime_1Cycles5);
ADC_Cmd(ADC1, ENABLE);
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_RDY));
ADC_Cmd(ADC2, ENABLE);
while(!ADC_GetFlagStatus(ADC2, ADC_FLAG_RDY));
ADC_DMACmd(ADC1, ENABLE);
ADC_DMAConfig(ADC1, ADC_DMAMode_Circular);
ADC_DMACmd(ADC2, ENABLE);
ADC_DMAConfig(ADC2, ADC_DMAMode_Circular);
ADC_StartConversion(ADC1);
ADC_StartConversion(ADC2);
}
通道4是不是被复用了？ 参考意见
先调试通道4的AD，以便定位问题是AD部分还是DMA部分。
硬件上接固定电压，软件上在转换完成后把数据保存一段，然后观察数值对不对，据此判断是AD问题还是DMA问题。
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