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STM32F405RGT6_64PIN的芯片,PA0-PA7用做ADC1 DMA采样引脚,引脚全部接VCC的时候,只有PA4,PA5得到的数据是4095.。剩下的引脚都只有3000左右。使用STM32Cube生成工程也是这样。不知道是那里问题。STM32F407,用STM32Cube生成ADC1采样工程都是正确的。是我那里没有设置好吗。
代码: #define ADC1_DR_ADDRESS ((uint32_t)0x4001204C) uint16_t uhADCxConvertedValue[CHANNELNUM] = {0}; ADC_InitTypeDef ADC_InitStructure; ADC_CommonInitTypeDef ADC_CommonInitStructure; DMA_InitTypeDef DMA_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; /* Enable ADCx, DMA and GPIO clocks ****************************************/ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); /* DMA2 Stream0 channel2 configuration **************************************/ DMA_InitStructure.DMA_Channel = DMA_Channel_0; DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS; DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&uhADCxConvertedValue[0]; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStructure.DMA_BufferSize = CHANNELNUM; 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_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_Init(DMA2_Stream0, &DMA_InitStructure); DMA_Cmd(DMA2_Stream0, ENABLE); /* Configure ADC3 Channel7 pin as analog input ******************************/ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_Speed= GPIO_Medium_Speed; GPIO_Init(GPIOA, &GPIO_InitStructure); /* ADC Common Init **********************************************************/ ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div8; ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1; ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_10Cycles; ADC_CommonInit(&ADC_CommonInitStructure); /* ADC3 Init ****************************************************************/ ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ScanConvMode = ENABLE; ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConvEdge_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfConversion = 8; ADC_Init(ADC1, &ADC_InitStructure); /* ADC3 regular channel7 configuration **************************************/ ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_56Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_56Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_56Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_56Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 5, ADC_SampleTime_56Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 6, ADC_SampleTime_56Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 7, ADC_SampleTime_56Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 8, ADC_SampleTime_56Cycles); /* Enable DMA request after last transfer (Single-ADC mode) */ ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE); /* Enable ADC3 DMA */ ADC_DMACmd(ADC1, ENABLE); /* Enable ADC3 */ ADC_Cmd(ADC1,ENABLE); /* Start ADC Software Conversion */ ADC_SoftwareStartConv(ADC1); |
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6个回答
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谢谢分享
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你不能把这两个CUBE生成的程序做个对比,不就找出来了吗?
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也不妨检查下硬件,尤其各个电源管脚的连接情况。
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ADC输入接3V3得到4096数据,超过就不行了。
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