STM32CubeMX使用LL库设置PWM输出

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STM32CubeMX使用LL库设置PWM输出 [复制链接]

cube自动生成的初始化函数

void MX_TIM15_Init(void)
{
  LL_TIM_InitTypeDef TIM_InitStruct = {0};
  LL_TIM_OC_InitTypeDef TIM_OC_InitStruct = {0};
  LL_TIM_BDTR_InitTypeDef TIM_BDTRInitStruct = {0};

  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
  /* Peripheral clock enable */
  LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_TIM15);

  TIM_InitStruct.Prescaler = 0;
  TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP;
  TIM_InitStruct.Autoreload = 1000-LL_TIM_IC_FILTER_FDIV1_N2;
  TIM_InitStruct.ClockDivision = LL_TIM_CLOCKDIVISION_DIV1;
  TIM_InitStruct.RepetitionCounter = 0;
  LL_TIM_Init(TIM15, &TIM_InitStruct);
  LL_TIM_DisableARRPreload(TIM15);
  LL_TIM_OC_EnablePreload(TIM15, LL_TIM_CHANNEL_CH2);
  TIM_OC_InitStruct.OCMode = LL_TIM_OCMODE_PWM1;
  TIM_OC_InitStruct.OCState = LL_TIM_OCSTATE_DISABLE;
  TIM_OC_InitStruct.OCNState = LL_TIM_OCSTATE_DISABLE;
  TIM_OC_InitStruct.CompareValue = 500-LL_TIM_IC_FILTER_FDIV1_N2;
  TIM_OC_InitStruct.OCPolarity = LL_TIM_OCPOLARITY_HIGH;
  TIM_OC_InitStruct.OCNPolarity = LL_TIM_OCPOLARITY_HIGH;
  TIM_OC_InitStruct.OCIdleState = LL_TIM_OCIDLESTATE_LOW;
  TIM_OC_InitStruct.OCNIdleState = LL_TIM_OCIDLESTATE_LOW;
  LL_TIM_OC_Init(TIM15, LL_TIM_CHANNEL_CH2, &TIM_OC_InitStruct);
  LL_TIM_OC_DisableFast(TIM15, LL_TIM_CHANNEL_CH2);
  LL_TIM_SetTriggerOutput(TIM15, LL_TIM_TRGO_RESET);
  LL_TIM_DisableMasterSlaveMode(TIM15);
  TIM_BDTRInitStruct.OSSRState = LL_TIM_OSSR_DISABLE;
  TIM_BDTRInitStruct.OSSIState = LL_TIM_OSSI_DISABLE;
  TIM_BDTRInitStruct.LockLevel = LL_TIM_LOCKLEVEL_OFF;
  TIM_BDTRInitStruct.DeadTime = 0;
  TIM_BDTRInitStruct.BreakState = LL_TIM_BREAK_DISABLE;
  TIM_BDTRInitStruct.BreakPolarity = LL_TIM_BREAK_POLARITY_HIGH;
  TIM_BDTRInitStruct.AutomaticOutput = LL_TIM_AUTOMATICOUTPUT_DISABLE;
  LL_TIM_BDTR_Init(TIM15, &TIM_BDTRInitStruct);
  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOA);
    /**TIM15 GPIO Configuration
    PA3     ------> TIM15_CH2
    */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_3;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_14;
  LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

}

初始化后还不能正常运行，需要在main函数里面增加以下三行才能输出PWM波。

  LL_TIM_CC_EnableChannel(TIM15,LL_TIM_CHANNEL_CH2);
  LL_TIM_EnableCounter(TIM15);
  LL_TIM_EnableAllOutputs(TIM15); //打开BDTR的MOE寄存器才会有PWM波输出