STM32学习之编写定时器3产生4路PWM

Posted on by mindthink

看了stm32定时器完爆51后，看了原子的定时器3产生一路PWM ,于是就想着写一个定时器3产生4路PWM的程序。搞了一个晚上，该了又改，MDK中仿真后，总是不出波形，以为自己代码有问题，最后用示波器一看，what!!有波形啊，坑啊，这软件有bug啊，一路PWM时，仿真还挺正常，换成4路后，就完蛋了，不出波形了。额，软件不可靠啊，下面看代码：

#include "timer.h"
#include "led.h"
#include "usart.h"

void TIM3_Int_Init(u16 arr,u16 psc)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = arr;
    TIM_TimeBaseStructure.TIM_Prescaler =psc; 
    TIM_TimeBaseStructure.TIM_ClockDivision = 0; 
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); 

    TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); 

    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; 
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
    NVIC_Init(&NVIC_InitStructure); 

    TIM_Cmd(TIM3, ENABLE);  

}
//¶¨Ê±Æ÷3ÖжϷþÎñ³ÌÐò
void TIM3_IRQHandler(void)  
{
    if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) 
        {
        TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );
        LED1=!LED1;
        }
}

void TIM3_PWM_Init(u16 arr,u16 psc)
{  
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_OCInitTypeDef  TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB  | RCC_APB2Periph_AFIO, ENABLE); 

    GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); 

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    TIM_TimeBaseStructure.TIM_Period = arr;
    TIM_TimeBaseStructure.TIM_Prescaler =psc; 
    TIM_TimeBaseStructure.TIM_ClockDivision = 0; 
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); 

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; 
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 
    TIM_OC2Init(TIM3, &TIM_OCInitStructure); 
    TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); 

    TIM_Cmd(TIM3, ENABLE);  

}
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