gpio配置完后,GPIOA->IDR一直被拉高

番茄君

#include "stm32f10x.h"


//开启时钟注意APB1还是APB2
void RCC_cfg(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);

}


//配置计时器
void TIM_cfg()
{
TIM_TimeBaseInitTypeDef TIM_TimebaseInitStructure;
TIM_DeInit(TIM2);
TIM_InternalClockConfig(TIM2);//把内部时钟配置给TIM2；
TIM_TimebaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimebaseInitStructure.TIM_Period = 2000-1;
TIM_TimebaseInitStructure.TIM_CounterMode =TIM_CounterMode_Up;
TIM_TimebaseInitStructure.TIM_Prescaler =36000-1;
TIM_TimebaseInitStructure.TIM_RepetitionCounter = 0;//重复计数溢出 X次才中断 0=1次
TIM_TimeBaseInit(TIM2,&TIM_TimebaseInitStructure);
}

//配置中断
void NVIC_cfg()
{
NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_PriorityGroupConfig (NVIC_PriorityGroup_1);//先占和从占分配
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

//配置GPIO 输出为推挽式
void GPIO_Cfg()
{

GPIO_InitTypeDef GPIO_InitStructure;
GPIO_DeInit(GPIOA);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

}



void TIM2_IRQHandler()
{
GPIO_SetBits(GPIOA,GPIO_Pin_8);



GPIO_ResetBits(GPIOA,GPIO_Pin_8);

TIM_ClearFlag(TIM2,TIM_FLAG_Update);
}

//主函数
int main()
{
SystemInit();

RCC_cfg();
TIM_cfg();
NVIC_cfg();
GPIO_Cfg();
GPIO_ResetBits(GPIOA,GPIO_Pin_8);
//开启TIM2计时器
TIM_ClearFlag(TIM2,TIM_FLAG_Update);
TIM_ARRPreloadConfig(TIM2, ENABLE);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
  TIM_Cmd(TIM2,ENABLE);

while(1);



}


GPIO_Cfg();这句话被执行后 
IDR=0x00005EFF
ODR=0x0000A000

正点原子

建议你学习下我们的例程先。