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基于STM32处理器定时器比较输出测试程序

作者:hcj2013  发布日期:2012-12-24 09:11:12

这是建立keil的工程的信息

这里给出最关键的三个文件
main.c文件

#include  "stm32f10x.h"  
#include  "stm32f10x_tim.h"  
#include  "misc.h"  
 
unsigned int CCR3_Val=5000;   
unsigned int CCR4_Val=10000;   
extern void time_ini(void);  
 
void RCC_Configuration(void)  
{  
  SystemInit();   
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);   
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC   
  | RCC_APB2Periph_GPIOD| RCC_APB2Periph_GPIOE , ENABLE);  
}  
 
void NVIC_Configuration(void)  
{  
  NVIC_InitTypeDef NVIC_InitStructure;  
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);  
 
 
  NVIC_InitStructure.NVIC_IRQChannel =TIM3_IRQn ;   //配置定时器中断   
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  
  NVIC_Init(&NVIC_InitStructure);    
}  
 
int main(void)  
{      
  RCC_Configuration();                   //系统时钟设置及外设时钟使能       
  NVIC_Configuration(); //中断源配置  
  time_ini(); //定时器3的初始化  
  while(1);  
}  

Tim.c文件

 

#include "stm32f10x_tim.h"  
#include "stm32f10x_gpio.h"  
#include  <stm32f10x.h>  
 
 
void time_ini(void);  
extern unsigned int CCR3_Val;  
extern unsigned int CCR4_Val;  
 
 
TIM_TimeBaseInitTypeDef  TIM3_TimeBaseStructure;  
TIM_OCInitTypeDef  TIM3_OCInitStructure;  
TIM_BDTRInitTypeDef TIM3_BDTRInitStructure;  
 
 
 
 
   
void time_ini(void)  
{  
  GPIO_InitTypeDef GPIO_InitStructure;  
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);    //定时器3 时钟使能  
    
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1; //PB5复用为TIM3的通道2  
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  
  GPIO_Init(GPIOB, &GPIO_InitStructure);  
 
 
   
  GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3 , ENABLE);  
   
    
  TIM3_TimeBaseStructure.TIM_Prescaler = 7200; //预分频器TIM3_PSC=63    
  TIM3_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数器向上计数模式 TIM3_CR1[4]=0  
  TIM3_TimeBaseStructure.TIM_Period =0xffff;        //自动重装载寄存器TIM3_APR             
  TIM3_TimeBaseStructure.TIM_ClockDivision = 0x0; //时钟分频因子 TIM3_CR1[9:8]=00  
  TIM_TimeBaseInit(TIM3,&TIM3_TimeBaseStructure); //写TIM3各寄存器参数  
    
  TIM3_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle ; //TIM3_CCMR1[14:12]=011  翻转当TIM3_CCR2=TIM3_CNT时,翻转OC2REF的电平   
  TIM3_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性  低电平有效 TIM3_CCER[5]=1;  
   
     
  TIM3_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //输入/捕获2输出允许  OC2信号输出到对应的输出引脚PB5  
  TIM3_OCInitStructure.TIM_Pulse =CCR3_Val;    //若CC1通道配置为输出:CCR2是装入当前捕获/比较2 TIM3_CCR2寄存器的值(预装载值)。  
  TIM_OC3Init(TIM3, &TIM3_OCInitStructure);  
  TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Disable);  
    
     
  TIM3_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //输入/捕获2输出允许  OC2信号输出到对应的输出引脚PB5  
  TIM3_OCInitStructure.TIM_Pulse =CCR4_Val;    //若CC1通道配置为输出:CCR2是装入当前捕获/比较2 TIM3_CCR2寄存器的值(预装载值)。 www.it165.net 
  TIM_OC4Init(TIM3, &TIM3_OCInitStructure);  
  TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Disable);    //TIM3_CCMR1[1]=0  禁止TIM3_CCR2寄存器的预装载功能,可随时写入TIM3_CCR2  
                                                                
  TIM_Cmd(TIM3,ENABLE); //启动定时器3 TIM3_CR1[0]=1;    
  TIM_ITConfig(TIM3,TIM_IT_CC3|TIM_IT_CC4,ENABLE); //TIM3_DIER[2]=1  允许捕获/比较2中断  
}  

stm32f10x_it.c文件

 

#include  "stm32f10x.h"  
#include  "stm32f10x_tim.h"  
unsigned int capture1=0;  
extern unsigned int CCR3_Val;  
extern unsigned int CCR4_Val;  
extern TIM_OCInitTypeDef  TIM3_OCInitStructure;  
 
 
void TIM3_IRQHandler(void)  
{  
  if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET)    //判断状态寄存器 TIM3_SR[2] 是否发生了捕获/比较2 中断  
  {  
    TIM_ClearITPendingBit(TIM3, TIM_IT_CC3); //软件清除状态寄存器 TIM3_SR[2] 捕获/比较2 中断中断标志  
    capture1 = TIM_GetCapture3(TIM3); //获取TIM3_CCR2的预装值  
    TIM_SetCompare3(TIM3, capture1+ CCR3_Val); //和CCR2_Val累加后装入TIM3_CCR2 这是为了配合计数器值的递增。以在下一次作出比较。  
  }  
    
 if (TIM_GetITStatus(TIM3, TIM_IT_CC4) != RESET)    //判断状态寄存器 TIM3_SR[2] 是否发生了捕获/比较2 中断  
  {  
    TIM_ClearITPendingBit(TIM3, TIM_IT_CC4); //软件清除状态寄存器 TIM3_SR[2] 捕获/比较2 中断中断标志  
    capture1 = TIM_GetCapture4(TIM3); //获取TIM3_CCR2的预装值  
    TIM_SetCompare4(TIM3, capture1+ CCR4_Val); //和CCR2_Val累加后装入TIM3_CCR2 这是为了配合计数器值的递增。以在下一次作出比较。  
  }  
}  

 

Tag标签: STM32处理器   定时器  
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