实现不了PWM灯的闪烁大神看看找了好久都找不出原因

有你就足够 · 发表于 2014-10-17 22:50:49

[mw_shl_code=c,true]#include"TIMER.h" #include"led.h" void TIM1_PWM_Init(u16 arr,u16 psc) { RCC->APB2ENR|=1<11; //outside clock enable GPIOA->CRH&=0XFFFFFFF0; //clear gpioa GPIOA->CRH|=0X0000000B; //multiplexing output TIM1->ARR=arr; TIM1->

SC=psc; TIM1->CCMR1|=7<<4; TIM1->CCMR1|=1<<3; TIM1->CCER|=1<<0; //ENABLE ch1 TIM1->BDTR|=1<<15; //high timer MOE TIM1->CR1=0X0080; //APRE enable TIM1->CR1|=1<<0; //TIMER ENABLE } void TIM3_Init(u16 arr,u16 psc) { RCC->APB1ENR|=1<<1; //outside clock enable TIM3->ARR=arr; TIM3->

SC=psc; TIM3->DIER|=1<<0; //up to date enable interrupt TIM3->CR1|=1<<0; //enable MY_NVIC_Init(1,3,TIM3_IRQn,2); } void TIM3_IRQHandler() { if(TIM3->SR&0X0001) //go to interrupt LED1=!LED1; TIM3->SR=0X00; //clear interrupt flag } #ifndef _TIMER_H #define _TIMER_H #include"sys.h" #define led0_PWM_val TIM1->CCR1 void TIM3_Init(u16 arr,u16 psc); void TIM1_PWM_Init(u16 arr,u16 psc); #endif[/mw_shl_code] [mw_shl_code=c,true] #include<sys.h> #include<usart.h> #include<delay.h> #include<LED.h> #include<TIMER.h> int main(void) { u16 led0val=0; u8 dir=0; Stm32_Clock_Init(9); //set system clock delay_init(72); //delay init LED_Init(); // TIM3_Init(4999,7199); //（arr+1）*（psc+1）/72M TIM1_PWM_Init(899,0); //80K while(1) { delay_ms(5); /* led0val++; if(led0val==300) led0val=0; led0_PWM_val=led0val; */ if(dir) led0val++; else led0val--; if(led0val>300) dir=0; if(led0val==0) dir=1; led0_PWM_val=led0val; } } [/mw_shl_code]