本帖最后由 年轻人叫小马 于 2016-6-14 23:34 编辑
030 ADC 采用单次模式,搞了一天了不知道什么问题。各位帮忙看看
通道1采出来偏小0.5v左右,通道0 也有偏小。0和1单独采正确
#include "adc.h"
void ADC1_Config(void)
{
ADC_InitTypeDef ADC_InitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
/* Enable GPIOA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);//使能GPIOA时钟
/* ADC1 Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);//使能ADC1时钟
RCC_ADCCLKConfig(RCC_ADCCLK_PCLK_Div2) ;
/* Configure PA.0 as analog input */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStruct); //设置PA0为模拟输入,PA0对应的是通道0 ADC总共19个通道,16个外部通道,一个温度,一个电压,还有一个自己内部的Vbat通道;
/* ADC1 DeInit */
ADC_DeInit(ADC1);
/* Initialize ADC structure */
ADC_StructInit(&ADC_InitStruct);
/* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits */
// ADC_InitStruct.ADC_Mode=ADC_Mode_Independent;
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b; //12位的分辨率
ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;//ENABLE; //循环采样,意思就是在整个程序可以被进行多次转换,单次转换的话整个程序生命周期只能被触发一次
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//软件触发
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;// 右对齐
ADC_InitStruct.ADC_ScanDirection = ADC_ScanDirection_Upward ;//ADC_ScanDirection_Backward;
ADC_Init(ADC1, &ADC_InitStruct);
ADC_ChannelConfig(ADC1, ADC_Channel_0, ADC_SampleTime_55_5Cycles);// 设置采样通道,一定要把通道号和引脚的串口号对应起来
ADC_ChannelConfig(ADC1, ADC_Channel_1, ADC_SampleTime_55_5Cycles);
/* ADC Calibration */
ADC_GetCalibrationFactor(ADC1); //adc校准
ADC_Cmd(ADC1, ENABLE); // 使能adc
/* Wait the ADCEN falg */
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));
/* ADC1 regular software Start Conv */
ADC_StartOfConversion(ADC1); // 开始ADC转换
}
//ADCData[Num]=ADC_GetConversionValue(ADC1); // 在实际程序中可以用这个函数进行采样
uint16_t Adc_Switch(uint32_t ADC_Channel)
{
// ADC1->CHSELR = 0 ;
// ADC1->CHSELR = (uint32_t)ADC_Channel; //????
// /* ADC1 regular Software Start Conv */
// ADC_StartOfConversion(ADC1); //????
// while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET) ; //????
// ADCx->CHSELR = (uint32_t)ADC_Channel;
ADC_ChannelConfig(ADC1, ADC_Channel, ADC_SampleTime_55_5Cycles);// 设置采样通道,一定要把通道号和引脚的串口号对应起来
/* ADC Calibration */
// ADC_GetCalibrationFactor(ADC1); //adc校准
ADC_Cmd(ADC1, ENABLE); // 使能adc
/* Wait the ADCEN falg */
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));
/* ADC1 regular software Start Conv */
ADC_StartOfConversion(ADC1); // 开始ADC转换
//while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET) ;
return ADC_GetConversionValue(ADC1) ;
}
unsigned int GetADC_Channel_0(void)
{
unsigned int DataValue;
// uint8_t i;
// uint32_t sum;
// for(i=0;i<100;i++)
// {
DataValue=Adc_Switch(ADC_Channel_0);
// sum+=DataValue;
// }
// DataValue=sum/100;
return DataValue;
}
unsigned int GetADC_Channel_1(void)
{
unsigned int DataValue;
// uint8_t i;
// uint32_t sum;
// for(i=0;i<100;i++)
// {
DataValue=Adc_Switch(ADC_Channel_1);
// sum+=DataValue;
// }
// DataValue=sum/100;
return DataValue;
}
友情提示: 此问题已得到解决,问题已经关闭,关闭后问题禁止继续编辑,回答。
#include "adc.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ADC1_DR_Address 0x40012440
__IO uint16_t RegularConvData_Tab[2];
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_1|GPIO_Pin_0;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStruct); // PC1,输入时不用设置速率
/* DMA1 Channel1 Config */
DMA_DeInit(DMA1_Channel1);
DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)&RegularConvData_Tab;
DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStruct.DMA_BufferSize =8;
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);
/* DMA1 Channel1 enable */
DMA_Cmd(DMA1_Channel1, ENABLE);
// /* 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_Backward;
ADC_Init(ADC1, &ADC_InitStruct);
// /* Convert the ADC1 temperature sensor with 55.5 Cycles as sampling time */
ADC_ChannelConfig(ADC1, ADC_Channel_0 , ADC_SampleTime_55_5Cycles);
// ADC_TempSensorCmd(ENABLE);
/* Convert the ADC1 Vref with 55.5 Cycles as sampling time */
ADC_ChannelConfig(ADC1, ADC_Channel_1 , ADC_SampleTime_55_5Cycles);
// ADC_VrefintCmd(ENABLE);
/* ADC Calibration */
ADC_GetCalibrationFactor(ADC1);
ADC_DMACmd(ADC1, 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);
}
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