- #include "led.h"
- #include "delay.h"
- #include "key.h"
- #include "sys.h"
- #include "usart.h"
- #include "timer.h"
-
-
- int main(void)
- {
- u16 i=0,j=0;
- delay_init(); //延时函数初始化
- LED_Init(); //LED端口初始化
- TIM3_PWM_Init(1999,719);
- TIM1_PWM_Init(1999,719); //不分频,PWM频率=72000000/720/2000=50hz
- while(1)
- {
- for(i=1950;i>1749;i--){
- TIM_SetCompare1(TIM1,i); //对应0度 2.5%
- delay_ms(10);
- }
- for(i=1750;i<1951;i++){
- TIM_SetCompare1(TIM1,i); //对应0度 2.5%
- delay_ms(10);
- }
- for(i=1750;j<1951;j++){
- LED0_PWM_VAL=j;
- delay_ms(10);
- }
- for(i=1951;j>1749;j--){
- LED0_PWM_VAL=j;
- delay_ms(10);
- }
- }
- }
复制代码- #include "timer.h"
- #include "led.h"
- #include "usart.h"
- void TIM3_PWM_Init(u16 arr,u16 psc)
- {
- //此部分需手动修改IO口设置
- RCC->APB1ENR|=1<<1; //TIM3时钟使能
- RCC->APB2ENR|=1<<3; //使能PORTB时钟
- GPIOB->CRL&=0XFF0FFFFF; //PB5输出
- GPIOB->CRL|=0X00B00000; //复用功能输出
-
- RCC->APB2ENR|=1<<0; //开启辅助时钟
- AFIO->MAPR&=0XFFFFF3FF; //清除MAPR的[11:10]
- AFIO->MAPR|=1<<11; //部分重映像,TIM3_CH2->PB5
- TIM3->ARR=arr; //设定计数器自动重装值
- TIM3->PSC=psc; //预分频器不分频
-
- TIM3->CCMR1|=7<<12; //CH2 PWM2模式
- TIM3->CCMR1|=1<<11; //CH2预装载使能
- TIM3->CCER|=1<<4; //OC2 输出使能
- TIM3->CR1=0x0080; //ARPE使能
- TIM3->CR1|=0x01; //使能定时器3
- }
- 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, ENABLE);//
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE); //使能GPIO外设时钟使能
- //设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH1
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
-
- 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 80K
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 不分频
- 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
-
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
- TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
- 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TIM_OCInitStruct中指定的参数初始化外设TIMx
-
- TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE 主输出使能
- TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //CH1预装载使能
- TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
- TIM_Cmd(TIM1, ENABLE); //使能TIM1
- }
复制代码
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