寄存器输入，键盘扫描，不知道哪里错了

时代将军 · 发表于 2015-5-28 20:44:48

#include "key.h"
#include "delay.h"

void keyinit()
{
   RCC->APB2ENR|=(1<<2);    //开PA使能

   GPIOA->CRH|=0X80800000; //设置PA13，15为输入，上拉/下拉模式
   GPIOA->ODR&=0X5FFF;               //初始化PA13，15
   GPIOA->ODR|=0XA000;                   //设置PA13，15上拉输入

   GPIOA->CRL|=0X00000008;    //设置PA0为输入，上拉/下拉模式
}
void keyscan()
{
           uint8_t num;
   if(!(GPIOA->IDR&(0X8000)))    //PA15   KEY1
   {
       delay_ms(10);
       if(!(GPIOA->IDR&(0X8000)))
           GPIOD->ODR=~GPIOD->ODR;
       while(!(GPIOA->IDR&(0X8000)));
   }

   else if(!(GPIOA->IDR&(0X2000)))    //PA13    KEY0
   {
       delay_ms(10);
       if(!(GPIOA->IDR&(0X2000)))
           GPIOC->ODR=~GPIOC->ODR;
       while(!(GPIOA->IDR&(0X2000)));
   }
   else if(GPIOA->IDR&(0X0001))    //PA0       KEY2
   {
       delay_ms(10);

       if(GPIOA->IDR&(0X0001))
       {
           num++;
           if(num/2==0)
           {
               GPIOA->BRR|=0X0100;
           }
           else
           {
               GPIOA->BSRR|=(0X00000100);
           }
           if(num>=10)
           {
               num=0;
           }
       }
           while(GPIOA->IDR&(0X0001));
   }
}

#include "led.h"
void LED_Init(void){
   RCC->APB2ENR|=(1<<2); //A8
   RCC->APB2ENR|=1<<4; //C12
   RCC->APB2ENR|=1<<5; //D2

   GPIOA->CRH&=0xfffffff0;    //LED中
   GPIOA->CRH|=0x00000003;
GPIOA->ODR|=(1<<8);

   GPIOC->CRH&=0xfff0ffff;           //LED右
   GPIOC->CRH|=0x00030000;
   GPIOC->ODR|=(1<<12);

   GPIOD->CRL&=0xfffff0ff;           //LED左
   GPIOD->CRL|=0x00000300;
   GPIOD->ODR|=(1<<2);
}
#include "led.h"
#include "delay.h"
#include "key.h"
int main(void)
{
   uint8_t kk;
   Stm32_Clock_Init(9);//系统时钟设置
   delay_init(72);       //延时初始化
   LED_Init();           //初始化与LED连接的硬件接口
   keyinit();      //键盘初始化
   while(1)
   {
       kk=keyscan();
       switch(kk)
       {
           case 1: GPIOC->ODR^=(1<<12);break;
           case 2: GPIOA->ODR^=(1<<8); break;
           case 3: GPIOD->ODR^=(1<<2); break;
       }
   }
}
为什么下拉输入不好使？