DA通道2输出正常，DA通道1输出不正常，懂的帮忙看一下

风继续吹QAQ 提问时间：2015-6-10 16:06 /

本帖最后由风继续吹QAQ 于 2015-6-11 10:41 编辑

static void DAC_Config(void)
{

      GPIO_InitTypeDef GPIO_InitStructure;
      DAC_InitTypeDef  DAC_InitStructure;

  /* 使能GPIOA时钟 */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

      /* 使能DAC时钟 */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);

  /* DAC的GPIO配置，模拟输入 */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_4|GPIO_Pin_5 ;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

  GPIO_Init(GPIOA, &GPIO_InitStructure);


  /* 配置DAC 通道1 */
  DAC_InitStructure.DAC_Trigger = DAC_Trigger_Software;                                              //使用软件触发
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;       //不使用波形发生器
  DAC_InitStructure.DAC_Buffer_Switch = DAC_BufferSwitch_Disable;       //不使用DAC输出缓冲
  DAC_Init(DAC1,DAC_Channel_1,&DAC_InitStructure);

  /* 配置DAC 通道2 */
      DAC_InitStructure.DAC_Trigger = DAC_Trigger_Software;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_Triangle;
DAC_InitStructure.DAC_Buffer_Switch = DAC_BufferSwitch_Disable;
DAC_Init(DAC1, DAC_Channel_2,&DAC_InitStructure);


  /* 使能通道1 由PA4输出 */
  DAC_Cmd(DAC1,DAC_Channel_1, ENABLE);
  /* 使能通道2 由PA5输出 */
  DAC_Cmd(DAC1,DAC_Channel_2, ENABLE);

}
void DAC_test(void)
{

      DAC_Config();                   //调用DAC初始化函数
      DAC_DualSoftwareTriggerCmd(DAC1,ENABLE);          //同时启用两个DAC通道触发器

      DAC_SetChannel2Data(DAC1,DAC_Align_12b_R,0xfff);    //设置通道1输出电压值大约为3.3V
      DAC_SoftwareTriggerCmd(DAC1,DAC_Channel_1,ENABLE);//使能DAC通道1


      DAC_SetChannel2Data(DAC1,DAC_Align_12b_R,0x555);//设置通道1输出电压值大约为1.1V
      DAC_SoftwareTriggerCmd(DAC1,DAC_Channel_2,ENABLE);//使能DAC通道2

}

int main(void)
{

DAC_test();
  while (1)
  {

  }
}//通道1输出最大的时候也只是0.6V，而且根本不按程序的值输出。