STM32DAC和PWM时钟不同步

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可可球|

楼主 | 2017-3-14 22:09 | 只看该作者回帖奖励

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PWM, STM32, DAC, 时钟, TI

我利用stm32L4芯片内部DAC产生正弦波，再利用timer的PWM产生方波，可是利用示波器观察发现，两个波形不同步，开发库是HAL库，求解决方案，已经困扰我两个星期了。。。。我之前利用stm32F1的标准库产生的波形是同步的。。。部分代码如下：timer配置：
void       TIM1_Config(void)
{
TimHandle.Instance = TIM1;

  TimHandle.Init.Prescaler       = uhPrescalerValue1;
  TimHandle.Init.Period          = PERIOD_VALUE1;
  TimHandle.Init.ClockDivision    = 0;
  TimHandle.Init.CounterMode    = TIM_COUNTERMODE_UP;
  TimHandle.Init.RepetitionCounter = 0;

if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK)
  {
/* Initialization Error */
Error_Handler();
  }

  sConfig.OCMode    = TIM_OCMODE_PWM1;
  sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfig.OCFastMode = TIM_OCFAST_DISABLE;
  sConfig.OCNPolarity  = TIM_OCNPOLARITY_HIGH;
  sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
  sConfig.OCIdleState  = TIM_OCIDLESTATE_RESET;

  sConfig.Pulse = PULSE1_VALUE1;
  if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_1) != HAL_OK)
  {
/* Configuration Error */
Error_Handler();
  }

  if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_1) != HAL_OK)
  {
/* PWM Generation Error */
Error_Handler();
  }

}

DAC时钟配置：
void TIM6_Config(void)
{
  TIM_MasterConfigTypeDef sMasterConfig;

  htim.Instance = TIM6;

  htim.Init.Period          = PERIOD_VALUE6;
  htim.Init.Prescaler       = uhPrescalerValue2;
  htim.Init.ClockDivision    = 0;
  htim.Init.CounterMode    = TIM_COUNTERMODE_UP;
  htim.Init.RepetitionCounter = 0;
  HAL_TIM_Base_Init(&htim);

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;//TIM_TRGO_ENABLE;//
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

  HAL_TIMEx_MasterConfigSynchronization(&htim, &sMasterConfig);

  HAL_TIM_Base_Start(&htim);
}

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