STM32F407使用定时器1产生PWM_stm32f407 定时器1 pwm输出

1、项目中需要产生PWM信号，原子的例程中是通过TIM14产生PWM信号，然后我以为在初始化函数中只是简单的将TIM14替换为TIM1，程序就可以运行，忽略了TIM1是高级定时器，TIM14为通用定时器。部分功能TIM14中没有，初始化中也没有初始化TIM1中的部分功能，所以在修改TIM14的初始化程序中要添加TIM1中的寄存器，一定要把定时器中必要的所有寄存器全部进行初始化。代码如下。

void TIM1_PWM_Init(u32 arr,u32 psc)
{	//	TIM1_PWM_Init(500-1,84-1);		 					 
	//此部分需手动修改IO口设置
	
	GPIO_InitTypeDef GPIO_InitStructure;
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	TIM_OCInitTypeDef  TIM_OCInitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);  	//TIM1时钟使能    
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); 	//使能PORTA时钟	
	
	GPIO_PinAFConfig(GPIOA,GPIO_PinSource8,GPIO_AF_TIM1); //GPIOA8复用为定时器1
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;           //GPIOA8
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;        //复用功能
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;	//速度100MHz
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;      //推挽复用输出
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;        //上拉
	GPIO_Init(GPIOA,&GPIO_InitStructure);              //初始化PA8
	  
	TIM_TimeBaseStructure.TIM_Prescaler=psc;  //定时器分频
	TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
	TIM_TimeBaseStructure.TIM_Period=arr;   //自动重装载值
	TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; 
	TIM_TimeBaseStructure.TIM_RepetitionCounter=0;  //20201020
	TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);//初始化定时器1
	
	//初始化TIM1 Channel1 PWM模式	
 	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
	TIM_OCInitStructure.TIM_OutputNState = TIM_OutputState_Disable;//20201020	
	
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性低
	TIM_OCInitStructure.TIM_OCNPolarity= TIM_OCPolarity_High;//20201020
  TIM_OCInitStructure.TIM_OCIdleState= 0x00000000U  ;//20201020    
	TIM_OCInitStructure.TIM_OCNIdleState=0x00000000U;//20201020
 
	TIM_OCInitStructure.TIM_Pulse=300;
//	TIM_SetCompare1(TIM1,CCR1_Val);// channel 1   20201020	
	TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 4OC1
 
	TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1在CCR1上的预装载寄存器
 
  TIM_ARRPreloadConfig(TIM1,ENABLE);//ARPE使能 
	
	TIM_Cmd(TIM1, ENABLE);  //使能TIM1
	
	TIM_CtrlPWMOutputs(TIM1, ENABLE);    //20201020
  
										  
}