#include "stm32f10x.h"
static GPIO_InitTypeDef GPIO_InitStructure;
static NVIC_InitTypeDef NVIC_InitStructure;
static TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
#define PB5OUT(n) *(volatile uint32_t *)(0x42000000+((uint32_t)&GPIOB->ODR-0x40000000)*32+n*4)
void led0(void){
//led0-->PB5
//使能端口
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
//初始化GPIO引脚
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed= GPIO_Speed_50MHz;//高速响应
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_5);
}
void TIM2init(void){
//使能定时器2硬件时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
//配置定时器2 分配值，计数值等
TIM_TimeBaseStructure.TIM_Period = 10000-1;//计数值
TIM_TimeBaseStructure.TIM_Prescaler = 7200-1;//预分频器7100-1+1，隐形着一个+1操作，所以要减一
TIM_TimeBaseStructure.TIM_ClockDivision = 0;//这个用不到
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
//配置定时器2中断的触发方式
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
//配置定时器2的中断优先级
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//使能定时器2
TIM_Cmd(TIM2, ENABLE);
}
void TIM2_IRQHandler(void){
if(TIM_GetITStatus(TIM2,TIM_IT_Update)==SET)
{PB5OUT(5)^=1 ;
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
}
}
int main(){
led0();
TIM2init();
while(1){
}
}
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