2019年08月21日 | STM32的TIM1互补PWM输出

芯片为STM32F412VETx，使用的是高级定时器TIM1的PWM互补PWM输出，看一下STM32CubeMX配置，

再看时钟的配置，TIM1用的是APB2的时钟，。

再看引脚的配置

产生的PWM频率为：Fpwm = 96MHz / ((95+1)(9999+1)) =100Hz，占空比为50%

然后生成代码，看下代码中的FMX_TIM1_Init函数初始化

/* TIM1 init function */

static void FMX_TIM1_Init(void)

{

  TIM_ClockConfigTypeDef sClockSourceConfig;

  TIM_MasterConfigTypeDef sMasterConfig;

  TIM_OC_InitTypeDef sConfigOC;

  TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig;

  htim1.Instance = TIM1;

  htim1.Init.Prescaler = 95;

  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;

  htim1.Init.Period = 9999;

  htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

  htim1.Init.RepetitionCounter = 0;

  if (HAL_TIM_Base_Init(&htim1) != HAL_OK)  //使能TIM1时钟

  {

    _Error_Handler(__FILE__, __LINE__);

  }

  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

  if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

  if (HAL_TIM_PWM_Init(&htim1) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

  sConfigOC.OCMode = TIM_OCMODE_PWM1;

  sConfigOC.Pulse = 5000;

  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;

  sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;

  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;

  sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;

  sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;

  if (HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

  sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;

  sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;

  sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;

  sBreakDeadTimeConfig.DeadTime = 0;

  sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;

  sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;

  sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;

  if (HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

  HAL_TIM_MspPostInit(&htim1);  //引脚配置

}

好了到此TIM1的PWM互补已经配置完成，接下来就是要是要使能PWM输出了，接下在再main函数中使能输出就OK了。

    HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1);    //starts PWM on CH1 pin

    HAL_TIMEx_PWMN_Start(&htim1, TIM_CHANNEL_1); //starts PWM on CH1N pin

最好用示波器看下效果图