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#include "stm32f10x.h"
void GPIO_Config(void)//GPIO配置
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);//使能gpioc的時(shí)
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; //選擇管腳PC.13作LED燈
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //管腳速度為50M
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //設(shè)置輸出模式為推挽輸出
GPIO_Init(GPIOC, &GPIO_InitStructure); //將上述設(shè)置寫入到GPIOC里去
}
void NVIC_Config(void) //中斷控制器的配置
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //優(yōu)先組設(shè)置
NVIC_InitStructure.NVIC_IRQChannel =TIM2_IRQn ; //TIM2中斷選通
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //搶占優(yōu)先級(jí)
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子優(yōu)先級(jí)
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能中斷控制
NVIC_Init(&NVIC_InitStructure);
}
void Timer_Config(void) //定時(shí)器的配置
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 , ENABLE); //Timer2 時(shí)鐘使能
TIM_DeInit(TIM2); //復(fù)位TIM2定時(shí)器
TIM_TimeBaseStructure.TIM_Period=1000; //定時(shí)器周期
TIM_TimeBaseStructure.TIM_Prescaler=36000-1; //預(yù)分頻數(shù)
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; //TIM2時(shí)鐘分頻,為1表示不分頻
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//定時(shí)器計(jì)數(shù)為向上計(jì)數(shù)模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ClearFlag(TIM2, TIM_FLAG_Update); //清除定時(shí)器2的溢出標(biāo)志位
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE); //使能定時(shí)器2溢出中斷
TIM_Cmd(TIM2, ENABLE); //定時(shí)器2使能
}
int main(void)
{
SystemInit();//初始化時(shí)鐘，配置為72MHz，我試過將這句注釋掉，好像不影響結(jié)果。查了一下，在配置
//main函數(shù)之前的啟動(dòng)代碼有這樣一句 LDR R0, =SystemInit，我疑惑的是難道啟動(dòng)的時(shí)候就配成72Mhz?
GPIO_Config();
NVIC_Config();
Timer_Config();
while(1)
{
;
}
}
void TIM2_IRQHandler(void)
{
static int flag_bit=0;//定義一個(gè)標(biāo)志位
if ( TIM_GetITStatus(TIM2 , TIM_IT_Update) != RESET ) //判斷中斷溢出標(biāo)志為是否為1
{
TIM_ClearITPendingBit(TIM2 , TIM_FLAG_Update); //清除溢出中斷標(biāo)志位
flag_bit = !flag_bit;
if(flag_bit == 1)
{
GPIO_SetBits(GPIOC, GPIO_Pin_13); //熄滅LED
}
if(flag_bit == 0)
{
GPIO_ResetBits(GPIOC, GPIO_Pin_13); //點(diǎn)亮LED
}
}
}

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