void GPIO_PA_Init()
{//PA8管脚配置
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_DeInit(GPIOA);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP ;//推挽输出
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);//使能端口时钟A
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void TIMER3_Init()
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_DeInit(TIM3);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
TIM_TimeBaseStructure.TIM_Period=10000;//ARR的值
TIM_TimeBaseStructure.TIM_Prescaler=7200-1;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
TIM_Cmd(TIM3, ENABLE); //开启时钟
}
void NVIC_Configuration()
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); // 抢占式优先级别
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQChannel;//指定中断源
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;// 指定响应优先级别1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
int main(void)
{
Stm32_Clock_Init(9); //系统时钟设置
delay_init(72); //延时初始化
GPIO_PA_Init();
TIMER3_Init();
NVIC_Configuration();
while(1);
}
void TIM3_IRQHandler()
{
if(TIM_GetITStatus(TIM3 , TIM_IT_Update) == SET)
{
TIM_ClearITPendingBit(TIM3 , TIM_FLAG_Update);
if(GPIO_ReadOutputDataBit(GPIOA,GPIO_Pin_8)) GPIO_ResetBits(GPIOA, GPIO_Pin_8);
else GPIO_SetBits(GPIOA, GPIO_Pin_8);
}
}
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