ST意法半导体中文论坛ST32F103 的DAC问题

ST32F103 的DAC问题

tangzhidao 提问时间：2015-6-24 11:46 /

问答
是否解决:

我在用stm32f103的时侯需要用两的DAC, 写了如下的config程序, 本意是让 ADC1 , ADC2 都先归结为0电位，测试后发现，PA4 （ADC0）没问题，但 PA5 (ADC1) 量得却有 0.4V 的电压，请问大师们，程序有 bug吗？

void ConfigDAC(void)
{

{
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

            GPIO_SetBits(GPIOA, GPIO_Pin_4);
            GPIO_SetBits(GPIOA, GPIO_Pin_5);
}

{
  DAC_InitTypeDef DAC_InitStructure;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
  DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
            DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_4095;
  DAC_Init(DAC_Channel_1, &DAC_InitStructure);
  DAC_Init(DAC_Channel_2, &DAC_InitStructure);
            DAC_Cmd(DAC_Channel_1, ENABLE);
            DAC_SetChannel1Data(DAC_Align_12b_R, 0);
            DAC_Cmd(DAC_Channel_2, ENABLE);
            DAC_SetChannel2Data(DAC_Align_12b_R, 0);
      }

}

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赞收藏评论5 发布时间：2015-6-24 11:46

5个回答

Mandelbrot_Set 回答时间：2015-6-24 15:10:48

没明白说的是ADC还是DAC...

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黑溱郎回答时间：2015-6-24 15:57:35

LS说的是，楼主是作ADC还是DAC？还是帮楼主顶一下吧。

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tangzhidao 回答时间：2015-6-25 14:28:02

大师们，我说的是 DAC!

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tangzhidao 回答时间：2015-6-25 14:29:02

我在用stm32f103的时侯需要用两的DAC, 写了如下的config程序, 本意是让 DAC1 , DAC2 都先归结为0电位，测试后发现，PA4 （DAC0）没问题，但 PA5 (DAC1) 量得却有 0.4V 的电压，请问大师们，程序有 bug吗？

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tangzhidao 回答时间：2015-6-25 14:31:18

void ConfigDAC(void)
{


{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);


            GPIO_SetBits(GPIOA, GPIO_Pin_4);
            GPIO_SetBits(GPIOA, GPIO_Pin_5);
}

{
DAC_InitTypeDef DAC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
            DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_4095;

DAC_Init(DAC_Channel_1, &DAC_InitStructure);
DAC_Init(DAC_Channel_2, &DAC_InitStructure);

            DAC_Cmd(DAC_Channel_1, ENABLE);
            DAC_SetChannel1Data(DAC_Align_12b_R, 0);
            DAC_Cmd(DAC_Channel_2, ENABLE);
            DAC_SetChannel2Data(DAC_Align_12b_R, 0);
      }


}

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ST32F103 的DAC问题

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