转：STM32746G-Discovery】DAC的使用

DAC 通道框图：

使能DAC 通道x 后，相应GPIO 引脚（PA4 或PA5）将自动连接到模拟转换器输出(DAC_OUTx)。为了避免寄生电流消耗，应首先将PA4 或PA5 引脚配置为模拟模式(AIN)。

对于DAC 单通道x，有三种可能的方式：

1、8 位右对齐

2、12 位左对齐

3、12 位右对齐

DAC通道一个配置函数如下：

static void DAC_Ch1_EscalatorConfig(void)
{
  /*##-1- Initialize the DAC peripheral*/
  if (HAL_DAC_Init(&DacHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /*##-1- DAC channel1 Configuration*/
  sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;

  if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DACx_CHANNEL) != HAL_OK)
  {
    /* Channel configuration Error */
    Error_Handler();
  }

  /*##-2- Enable DAC selected channel and associated DMA */
  if (HAL_DAC_Start_DMA(&DacHandle, DACx_CHANNEL, (uint32_t *)aEscalator8bit, 6, DAC_ALIGN_8B_R) != HAL_OK)
  {
    /* Start DMA Error */
    Error_Handler();
  }
}

三角波配置程序
static void DAC_Ch1_TriangleConfig(void)
{
  /*##-1- Initialize the DAC peripheral */
  if (HAL_DAC_Init(&DacHandle) != HAL_OK)
  {
    /* DAC initialization Error */
    Error_Handler();
  }

  /*##-2- DAC channel2 Configuration */
  sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;

  if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DACx_CHANNEL) != HAL_OK)
  {
    /* Channel configuration Error */
    Error_Handler();
  }

  /*##-3- DAC channel2 Triangle Wave generation configuration */
  if (HAL_DACEx_TriangleWaveGenerate(&DacHandle, DACx_CHANNEL, DAC_TRIANGLEAMPLITUDE_1023) != HAL_OK)
  {
    /* Triangle wave generation Error */
    Error_Handler();
  }

  if (HAL_DAC_Start(&DacHandle, DACx_CHANNEL) != HAL_OK)
  {
    /* Start Error */
    Error_Handler();
  }


  if (HAL_DAC_SetValue(&DacHandle, DACx_CHANNEL, DAC_ALIGN_12B_R, 0x100) != HAL_OK)
  {
    /* Setting value Error */
    Error_Handler();
  }
}

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