一.功能说明

使用STM32F030F4,通过Time1的CH2(PA9)产生周期为1s，占空比50%的PWM波，高电平在前，低电平在后。处理器时钟选用HSI(8MHz)，不启用PLL，定时器外设时钟8Mhz,定时器时钟8000分频，计一个数1ms。

二.TIM1概述

Timer1作为高级定时器，比其他定时器多了两个功能，一个重复计数器，一个刹车和死区。 重复计数器：可以让定时器多个周期才产生一次更新中断，如果需要设定产生多少个PWM波周期，这个功能比较实用。 刹车和死区：主要用于电机控制。 由于这两个功能导致Timer1用于产生普通PWM波会比其它定时器多一些配置。

三.CubeMX配置

Clock配置:

Timer1配置:

LL库选择:

四.Cube生成的TIM1初始化代码

/* TIM1 init function */
void MX_TIM1_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_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_TIM1);

  /* TIM1 interrupt Init */
  NVIC_SetPriority(TIM1_BRK_UP_TRG_COM_IRQn, 0);
  NVIC_EnableIRQ(TIM1_BRK_UP_TRG_COM_IRQn);

  TIM_InitStruct.Prescaler = 7999;
  TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP;
  TIM_InitStruct.Autoreload = 1000 - 1;
  TIM_InitStruct.ClockDivision = LL_TIM_CLOCKDIVISION_DIV1;
  TIM_InitStruct.RepetitionCounter = 0;
  LL_TIM_Init(TIM1, &TIM_InitStruct);
  LL_TIM_EnableARRPreload(TIM1);
  LL_TIM_SetClockSource(TIM1, LL_TIM_CLOCKSOURCE_INTERNAL);
  LL_TIM_OC_EnablePreload(TIM1, 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;
  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(TIM1, LL_TIM_CHANNEL_CH2, &TIM_OC_InitStruct);
  LL_TIM_OC_DisableFast(TIM1, LL_TIM_CHANNEL_CH2);
  LL_TIM_SetTriggerOutput(TIM1, LL_TIM_TRGO_RESET);
  LL_TIM_DisableMasterSlaveMode(TIM1);
  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(TIM1, &TIM_BDTRInitStruct);
  LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);
    /**TIM1 GPIO Configuration    
    PA9     ------> TIM1_CH2 
    */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_9;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_2;
  LL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

此初始化代码完成了基本的参数配置，没有启动定时器，所以只调用MX_TIM1_Init()函数，无法产生PWM波。

五.增加启动代码

/**
  * @brief  None
  * @param  None
  * @retval None
  */
void Timer1Ch2Start( void )
{
	MX_TIM1_Init();
	
	LL_TIM_CC_EnableChannel( TIM1 , LL_TIM_CHANNEL_CH2 );
	LL_TIM_EnableAllOutputs( TIM1 );						//只有Timer1等高级定时器需要，必须放置在LL_TIM_BDTR_Init(TIM1, &TIM_BDTRInitStruct);之后。
	
	LL_TIM_EnableCounter( TIM1 );	
	
	LL_TIM_GenerateEvent_UPDATE( TIM1 );
}

);之后。
	
	LL_TIM_EnableCounter( TIM1 );	
	
	LL_TIM_GenerateEvent_UPDATE( TIM1 );
}

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