STM32F030 AD采样怎么每个通道是MCU供电电压值呢？我用的MCU供电是3.0v,现在采样出来是3039 mV, 分别采样四个通道的AD值，都是一样的，是什么原因？有没有遇到的朋友
#define ADC1_DR_Address 0x40012440
__IO uint16_t ADC1ConvValue[4] = {0,0,0,0};
void ADC1_DMA_Init(void)
{
ADC_InitTypeDef ADC_InitStruct;
DMA_InitTypeDef DMA_InitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
/* ADC1 DeInit */
ADC_DeInit(ADC1);
/* Enable GPIOA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* ADC1 Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* DMA1 clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);
/* Configure PA.01 as analog input */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 ;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStruct);
/* DMA1 Channel1 Config */
DMA_DeInit( DMA1_Channel1 );
DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)&ADC1ConvValue;
DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStruct.DMA_BufferSize =4;
DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;
DMA_InitStruct.DMA_Priority = DMA_Priority_High;
DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStruct);
// /* ADC DMA request in circular mode */
ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);
/* Enable ADC_DMA */
// ADC_DMACmd(ADC1, ENABLE);
/* Initialize ADC structure */
ADC_StructInit(&ADC_InitStruct);
/* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits */
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStruct.ADC_ContinuousConvMode = ENABLE;
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStruct.ADC_ScanDirection = ADC_ScanDirection_Upward;
ADC_Init(ADC1, &ADC_InitStruct);
// /* Convert the ADC1 temperature sensor with 55.5 Cycles as sampling time */
// ADC_ChannelConfig(ADC1, ADC_Channel_TempSensor , ADC_SampleTime_55_5Cycles);
// ADC_TempSensorCmd(ENABLE);
/* Convert the ADC1 Vref with 55.5 Cycles as sampling time */
ADC_ChannelConfig(ADC1, ADC_Channel_0 , ADC_SampleTime_55_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_1 , ADC_SampleTime_55_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_2 , ADC_SampleTime_55_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_2 , ADC_SampleTime_55_5Cycles);
// ADC_VrefintCmd(ENABLE);
/* ADC Calibration */
// ADC_GetCalibrationFactor(ADC1);
// ADC_DMACmd(ADC1, ENABLE);
/* DMA1 Channel1 enable */
// DMA_Cmd(DMA1_Channel1, ENABLE);
/* Enable ADC1 */
// ADC_Cmd(ADC1, ENABLE);
/* Wait the ADCEN falg */
// while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));
/* ADC1 regular Software Start Conv */
// ADC_StartOfConversion(ADC1);
/* ADC Calibration */
ADC_GetCalibrationFactor(ADC1);
/* ADC DMA request in circular mode */
ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);
/* DMA1 Channel1 enable */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* Enable ADC_DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable the ADC peripheral */
ADC_Cmd(ADC1, ENABLE);
/* Wait the ADRDY flag */
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY));
/* ADC1 regular Software Start Conv */
ADC_StartOfConversion(ADC1);
}
//===========================================
while (1)
{
Free_WWDG();
//-----------------------------------------
key_scan();
LED_ON();
while((DMA_GetFlagStatus(DMA1_FLAG_TC1)) == RESET ) Free_WWDG();
/* Clear DMA TC flag */
DMA_ClearFlag(DMA1_FLAG_TC1);
batvolt_lsb = ADC1ConvValue[0];
Display(0,0,batvolt_lsb);
batvolt_lsb = ADC1ConvValue[1];
Display(40,0,batvolt_lsb);
batvolt_lsb = ADC1ConvValue[2];
Display(0,1,batvolt_lsb);
batvolt_lsb = ADC1ConvValue[3];
Display(40,1,batvolt_lsb);
}
主程序显示出来的是 3039 3039
3039 3039 |
|
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