发现个奇怪的问题，AD转换，双通道数据正常，当增加成三通道的时候数据就乱了，这是怎么回事？

wssc0000

[mw_shl_code=c,true]void Con_Trsf_AD_DMA() { GPIO_InitTypeDef GPIO_InitStructure; ADC_InitTypeDef ADC_InitStructure; DMA_InitTypeDef DMA_InitStructure; GPIO_InitStructure.GPIO_Pin = trsf_Pin; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_Init(trsf_GPIO, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = CO2_Pin; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_Init(CO2_GPIO, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = vol_Pin; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_Init(vol_GPIO, &GPIO_InitStructure); /* Enable DMA1 clock */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); /* Enable ADC1 and GPIOC clock */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); DMA_DeInit(DMA1_Channel1); DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCConvertedValue; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = 5000; 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_Channel1, &DMA_InitStructure); /* Enable DMA1 channel1 */ DMA_Cmd(DMA1_Channel1, ENABLE); /* ADC1 configuration ------------------------------------------------------*/ ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; ADC_InitStructure.ADC_ScanConvMode = ENABLE; ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfChannel = 2; ADC_Init(ADC1, &ADC_InitStructure); /* ADC1 regular channel1 configuration */ ADC_RegularChannelConfig(ADC1, CO2_Channelx, 1, ADC_SampleTime_239Cycles5); //ADC_RegularChannelConfig(ADC1, ADC_Channelx, 2, ADC_SampleTime_239Cycles5); ADC_RegularChannelConfig(ADC1, vol_Channel, 2, ADC_SampleTime_239Cycles5); //ADC_RegularChannelConfig(ADC1, ADC_Channelx, 3, ADC_SampleTime_239Cycles5); /* Enable ADC1 DMA */ ADC_DMACmd(ADC1, ENABLE); /* Enable ADC1 */ ADC_Cmd(ADC1, ENABLE); /* Enable ADC1 reset calibration register */ ADC_ResetCalibration(ADC1); /* Check the end of ADC1 reset calibration register */ while(ADC_GetResetCalibrationStatus(ADC1)); /* Start ADC1 calibration */ ADC_StartCalibration(ADC1); /* Check the end of ADC1 calibration */ while(ADC_GetCalibrationStatus(ADC1)); ADC_SoftwareStartConvCmd(ADC1, ENABLE); }[/mw_shl_code]

这是配置。
下面是读取函数

[mw_shl_code=c,true]void quick(uint16_t *a,int16_t i,int16_t j) //?ì?????ò { int16_t m,n,temp; uint16_t k; m=i; n=j; k=a[(i+j)/2]; /*??????????*/ do { while(a[m]<k&&m<j) m++; /* ??×ó??????±?k?ó??????*/ while(a[n]>k&&n>i) n--; /* ??????×ó??±?k????????*/ if(m<=n) { /*?????????ú×????????ò????*/ temp=a[m]; a[m]=a[n]; a[n]=temp; m++; n--; } }while(m<=n); if(m<j) quick(a,m,j); /*???????é*/ if(n>i) quick(a,i,n); } uint16_t readSF() //?????ò,??????×??ó×?????,×??ó???ù { uint8_t ji=0; ADC_TR_ave=0; for(ji=0;ji<20;ji++) { ADC_Tmp[ji]=ADCConvertedValue[ji*3+1]; } quick(ADC_Tmp,0,19); //0~35±ê??,??36?? for(ji=2;ji<18;ji++) { ADC_TR_ave+=ADC_Tmp[ji]; } ADC_TR_ave>>=4; if(ADC_TR_ave>4000) { trSF=1002; } else { trSF=(float)(ADC_TR_ave*(3.3/4096))*100; //AD*0.8/2 } if(trSF>999) trSF=999; return trSF; } uint16_t readCO2() { uint8_t ji=0; ADC_CO2_ave=0; for(ji=0;ji<20;ji++) { CO2_Tmp[ji]=ADCConvertedValue[ji*2]; } quick(CO2_Tmp,0,19); //0~35±ê??,??36?? for(ji=2;ji<18;ji++) { ADC_CO2_ave+=CO2_Tmp[ji]; } ADC_CO2_ave>>=4; CO2=(float)(ADC_CO2_ave*(3.3/4096))*100; //AD*0.8/2 return CO2; } uint16_t readVOL() { uint8_t ji=0; ADC_VOL_ave=0; for(ji=0;ji<20;ji++) { ADC4_Tmp[ji]=ADCConvertedValue[ji*2+1]; } quick(ADC4_Tmp,0,19); //0~35±ê??,??36?? for(ji=2;ji<18;ji++) { ADC_VOL_ave+=ADC4_Tmp[ji]; } ADC_VOL_ave>>=4; Vol=(uint16_t)(ADC_VOL_ave*330/4096); //AD*0.8/2 return Vol; }[/mw_shl_code]

然后再主函数里面分别读取三个ad转换值
用的是10\11\15三个通道，其中其中任意两个组合成双通道都可以正常采集，三个一起就采集数据就异常了

正点原子

帮顶。。。。