STM32F103的定时器1用作PWM输出————_物联网

STM32F103的定时器1用作PWM输出————

void TIM1_PWM_Init(u16 arr,u16 psc)
{  
	GPIO_InitTypeDef GPIO_InitStructure;
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	TIM_OCInitTypeDef  TIM_OCInitStructure;
	

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA, ENABLE);	//使能定时器1时钟
	
 
   //设置该引脚为复用输出功能,输出TIM2 CH1的PWM脉冲波形	GPIOA.0
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11; //TIM_CH1  TIM_CH2
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //推挽输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIO
 
   //初始化TIM2
	TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
	TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 
	TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
	TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
	
	//初始化TIM Channel 1-4 PWM模式	 
	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_OutputState = TIM_OutputState_Enable; //比较输出使能
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
	TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 OC1
	TIM_OC2Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 OC2
	TIM_OC3Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 OC3
	TIM_OC4Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 OC4

	TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1_CH1上的预装载寄存器
	TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1_CH2上的预装载寄存器
	TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1_CH3上的预装载寄存器
	TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1_CH4上的预装载寄存器
 
	TIM_Cmd(TIM1, ENABLE);  //使能TIM1
	TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
	TIM_CtrlPWMOutputs(TIM1,ENABLE);        //MOE 主输出使能,高级定时器必须开启这个

}

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