1，主從門(mén)控模式的介紹

STM32的每個(gè)定時(shí)器都可以由另一個(gè)定時(shí)器觸發(fā)啟動(dòng)定時(shí)器一般是通過(guò)軟件設(shè)置而啟動(dòng)，STM32的每個(gè)定時(shí)器也可以通過(guò)外部信號(hào)觸發(fā)而啟動(dòng)，還可以通過(guò)另外一個(gè)定時(shí)器的某一個(gè)條件被觸發(fā)而啟動(dòng).這里所謂某一個(gè)條件可以是定時(shí)到時(shí)、定時(shí)器超時(shí)、比較成功等許多條件.這種通過(guò)一個(gè)定時(shí)器觸發(fā)另一個(gè)定時(shí)器的工作方式稱為定時(shí)器的同步，發(fā)出觸發(fā)信號(hào)的定時(shí)器工作于主模式，接受觸發(fā)信號(hào)而啟動(dòng)的定時(shí)器工作于從模式。

從這個(gè)圖中可以TIM3（master）控制TIM1(slave)需要將TIM1的ITR設(shè)置為ITR2

2，使用主從門(mén)控模式輸出如下要求的波形

使用TIM3的CH1控制TIM1的CH1和CH2，每一個(gè)波的周期是25us，一組波的頻率是10HZ

3，TIM的配置

TIM3：

從3，

4，代碼實(shí)現(xiàn)

使用的芯片是stm32f051k6u6，HCLK= 48MHZ

/* TIM3 init function */
static void MX_TIM3_Init(void)
{

  TIM_MasterConfigTypeDef sMasterConfig;
  TIM_OC_InitTypeDef sConfigOC;

  htim3.Instance = TIM3;
  htim3.Init.Prescaler = 480-1;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 10020-1; //100ms一組
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)
  {
    Error_Handler();
  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_OC1REF;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }

  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 25;//10個(gè)波
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }

  HAL_TIM_MspPostInit(&htim3);

}

/* TIM1 init function */
static void MX_TIM1_Init(void)
{

  TIM_SlaveConfigTypeDef sSlaveConfig;
  TIM_MasterConfigTypeDef sMasterConfig;
  TIM_OC_InitTypeDef sConfigOC;
  TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig;

  htim1.Instance = TIM1;
  htim1.Init.Prescaler = 48-1;
  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim1.Init.Period = 25-1;
  htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim1.Init.RepetitionCounter = 0;
  htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
  {
    Error_Handler();
  }

  if (HAL_TIM_PWM_Init(&htim1) != HAL_OK)
  {
    Error_Handler();
  }

  sSlaveConfig.SlaveMode = TIM_SLAVEMODE_GATED;
  sSlaveConfig.InputTrigger = TIM_TS_ITR2; //TIM3 control TIM1
  if (HAL_TIM_SlaveConfigSynchronization(&htim1, &sSlaveConfig) != HAL_OK)
  {
    Error_Handler();
  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_OC1REF;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }

  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 12;
  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();
  }

  sConfigOC.OCPolarity = TIM_OCPOLARITY_LOW;
  if (HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
  {
    Error_Handler();
  }

  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();
  }

  HAL_TIM_MspPostInit(&htim1);

}

        HAL_TIM_PWM_Start(&htim1,TIM_CHANNEL_1);

	HAL_TIM_PWM_Start(&htim1,TIM_CHANNEL_2);

	HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_1);

    GPIO_InitStruct.Pull = GPIO_PULLDOWN;

但是PWM波輸出停止之后的PIN腳的電平我們不容易控制，他跟PWM波停止時(shí)的電平狀態(tài)相關(guān)，可以使用PIN重新初始化的方式，但是需要耗費(fèi)較長(zhǎng)的時(shí)間。