请高手帮忙解决下我的DAC的问题

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电梯直达

楼主

mcuatmel|

楼主 | 2011-12-8 09:22 | 只看该作者回帖奖励

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DAC, ni, ST, struct, structure

我的IC是STM32F103RCT6，程序如下：
void DAC_Configuration(void)
{
  DAC_InitTypeDef DAC_InitStructure;
/* DAC Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
/* DAC channel1 Configuration */
  DAC_DeInit();
  DAC_StructInit(&DAC_InitStructure);
  DAC_InitStructure.DAC_Trigger = DAC_Trigger_Software;
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
  DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude =DAC_TriangleAmplitude_4095;
  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
  DAC_Init(DAC_Channel_1, &DAC_InitStructure);
  DAC_StructInit(&DAC_InitStructure);
  DAC_InitStructure.DAC_Trigger = DAC_Trigger_Software;
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
  DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude =DAC_TriangleAmplitude_4095;
  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
  DAC_Init(DAC_Channel_2, &DAC_InitStructure);
  DAC_Cmd(DAC_Channel_1, ENABLE);
  DAC_Cmd(DAC_Channel_2, ENABLE);
  DAC_SetDualChannelData(DAC_Align_12b_R, 0, 0);
  DAC_DualSoftwareTriggerCmd(ENABLE);
}
这段程序执行完后，DA输出为1V左右，请问我的问题是硬件还是软件？
另：这颗IC的DAC的VREF是多少？

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