ad的采样转换值的问题请教

1万 · 2012-12-17 15:18

我现在发现的问题是ad的采样转换值怎么到1000多点就满量程了呢？！12位的ad不是4096才满嘛？！

1万 · 2012-12-17 15:18

怎么可以实现调用一次ad就转换一次，不调用就不转换？！

1万 · 2012-12-17 15:38

拿起书本发表于 2012-12-17 15:18
怎么可以实现调用一次ad就转换一次，不调用就不转换？！

可以。

记得 STM32有AD进行单次转换的例子。

只看该作者 · 2012-12-17 15:45

用软件启动AD软件，采用单次采集模式。

只看该作者 · 2012-12-17 15:46

12位Ad 最大4095，最小0

1万 · 2012-12-17 21:49

ad初始化设置
void ADC_Configure(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
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 = 1;
ADC_Init(ADC1, &ADC_InitStructure);
   ADC_TempSensorVrefintCmd(ENABLE);
ADC_InjectedSequencerLengthConfig(ADC1,1);
ADC_RegularChannelConfig(ADC1, ADC_Channel_17,  1,ADC_SampleTime_239Cycles5);//ADC_SampleTime_239Cycles5);
ADC_InjectedChannelConfig(ADC1, ADC_Channel_0,  1,ADC_SampleTime_239Cycles5);//ADC_SampleTime_239Cycles5);
ADC_InjectedChannelConfig(ADC1, ADC_Channel_0,  2,ADC_SampleTime_239Cycles5);//ADC_SampleTime_239Cycles5);
ADC_InjectedChannelConfig(ADC1, ADC_Channel_0,  3,ADC_SampleTime_239Cycles5);//ADC_SampleTime_239Cycles5);
ADC_InjectedChannelConfig(ADC1, ADC_Channel_0,  4,ADC_SampleTime_239Cycles5);//ADC_SampleTime_239Cycles5);
ADC_Cmd(ADC1, ENABLE);
ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
ADC_AutoInjectedConvCmd(ADC1, ENABLE);
ADC_ExternalTrigInjectedConvConfig(ADC1,ADC_ExternalTrigInjecConv_None);
ADC_ExternalTrigInjectedConvCmd(ADC1, ENABLE);
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
ADC_SoftwareStartInjectedConvCmd(ADC1, ENABLE);
}
ad数据采集转换
uint32_t AD_Start(void)
{ ADC_SoftwareStartConvCmd(ADC1, ENABLE);
while(!(ADC_GetFlagStatus(ADC1,ADC_FLAG_JEOC)));
ADC_ClearFlag(ADC1,ADC_FLAG_EOC);
ADC_ClearFlag(ADC1,ADC_FLAG_JEOC);
ref_12v=ADC1->DR; //neibucankaovcc

ad1=ADC1->JDR1;
ad2=ADC1->JDR2;
ad3=ADC1->JDR3;
ad4=ADC1->JDR4;
return ((ad1+ad2+ad3+ad4)/4);
}