赏析之 M3定时器 TIM3计数中断led闪烁 (13)

工程代码： 6_tim3计数中断led闪烁.rar  

#ifndef __TIM3_H
#define __TIM3_H

#include "stm32f10x_nvic.h"
#include "stm32f10x_tim.h"

void TIM3_Configuration(void);  //初始化 TIM3
void TIM3_NVIC_Configuration(void); //中断优先级配置

#endif

#include "tim3.h"
/*
*   rcc时钟配置： SYSCLK = 16MHZ
*                 AHB    = 16MHZ
*                   APB1   = 8 MHZ // TIM2 TIM3 TIM4
*                  APB2   = 16 MHZ //GPIO A B C D
*/
void TIM3_Configuration(void)
{
    TIM_TimeBaseInitTypeDef      TIM_TimeBaseStructure;

    TIM_TimeBaseStructure.TIM_Prescaler = 1; //APB1时钟 2预分频 8MHZ/2 = 4MHZ
                                            //1秒时间 4MHZ 的脉冲
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //计数模式
    TIM_TimeBaseStructure.TIM_Period = 4000;  //自动装载 从1~4000计数，刚好1ms时间
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM3, ENABLE);
    //需要使能TIM3时钟，我们已经在RCC头文件中 使能了
    //RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);    //定时器3提供时钟
}


/**********************************************************************
* 名    称:NVIC_Configuration()
* 功    能:中断优先级设置
* 入口参数：
* 出口参数：
-----------------------------------------------------------------------
* 说明：设置Tim3优先级
***********************************************************************/
void TIM3_NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

#ifdef  VECT_TAB_RAM
    /* Set the Vector Table base location at 0x20000000 */
    NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else  /* VECT_TAB_FLASH  */
    /* Set the Vector Table base location at 0x08000000 */
    NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//抢占式优先级别, 无抢占优先级

    /* Enable the TIM3 Interrupt 使能TIM3中断*/
    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQChannel;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

}