[嵌入式]stm32通用定时器1s延时实现LED闪烁

stm32有很多定时器，每种定时器的功能也不尽相同，今天学习了如何用通用定时器实现1s延时，使LED灯闪烁，现总结如下：

步骤总结：

使能定时器时钟->配置定时器结构体->清空定时器标志位->开启定时器中断->使能定时器->编写中断服务函数

Timer.c:

#include "Timer.h"

void TimerBase_Config(void)
{
	//开时钟
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	//定义结构体变量
	TIM_TimeBaseInitTypeDef TimerBaseInitStructure;
	NVIC_InitTypeDef NVICInitStructure;
	//配置定时器结构体
	TimerBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TimerBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TimerBaseInitStructure.TIM_Period = 10000;
	TimerBaseInitStructure.TIM_Prescaler = 7200;
	TIM_TimeBaseInit(TIM2, &TimerBaseInitStructure);
	//清空标志位
	TIM_ClearFlag(TIM2,TIM_FLAG_Update);
	//开启定时器中断
	TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
	//使能定时器
	TIM_Cmd(TIM2,ENABLE);
	//配置NVIC结构体
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	NVICInitStructure.NVIC_IRQChannel = TIM2_IRQn;
	NVICInitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVICInitStructure.NVIC_IRQChannelPreemptionPriority = 1;
	NVICInitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_Init(&NVICInitStructure);
}

stm32f103x_it.c:

void TIM2_IRQHandler(void)
{
	static uint16_t temp;
	
	if(TIM_GetITStatus(TIM2,TIM_IT_Update) != RESET)
	{
		if(temp ++ %2 == 1)
		{
			GPIO_ResetBits(LED_G_GPIO_PORT,LED_G_GPIO_PIN);
		}
		else 
		{
			GPIO_SetBits(LED_G_GPIO_PORT,LED_G_GPIO_PIN);
		}
	}
	TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
}

main.c:

#include "stm32f10x.h"
#include "led.h"
#include "Timer.h"

int main(void)
{
	TimerBase_Config();
	LED_GPIO_Confing();
	GPIO_SetBits(LED_G_GPIO_PORT,LED_G_GPIO_PIN);
	while(1)
	{
	
	}
}

注意事项：

一定要记得清空标志位，尤其是中断服务函数里的清空标志位，博主就因为此检查好长时间