求助，以下程序时按键扫描程序，想通过这个按键实现一个6位密码程序，与我所设定的密码比较，一样，蜂鸣器响，不一样，闪灯。

耐心的人 · 发表于 2018-1-26 16:58:11

u8 KeyMat_Scan(void)
{
u8 KeyVal;
u8 KeyVall;
int i;
int b[6];
RCC->APB2ENR|=1<<6;
GPIOE->CRL&=0X00000000;
GPIOE->ODR&=0X00000000;
GPIOE->CRL|=0X33338888;
GPIOE->ODR|=0XF0<<0;
if((GPIOE->IDR&0XFF)!=0XF0)
{
delay_ms(10);

      if((GPIOE->IDR&0XFF)!=0XF0)
{
switch(GPIOE->IDR&0XFF)
      {
case(0XF8): {KeyVal=1; KeyVall='*';} break;
case(0XF4): {KeyVal=2; KeyVall=0;} break;
case(0XF2): {KeyVal=3; KeyVall='#';} break;

      }


   GPIOE->CRL&=0X00000000;
         GPIOE->ODR&=0X00000000;
         GPIOE->CRL|=0X88883333;
         GPIOE->ODR|=0X0F<<0;
      delay_us(500);

      switch(GPIOE->IDR&0XFF)
{
case(0X3F): KeyVal=KeyVal;break;//////////1
                                       case(0X2F): KeyVal=KeyVal+3;break;///////////2
                                    case(0X6F): KeyVal=KeyVal+6;break;///////////3
case(0XAF): KeyVal=KeyVall;break;//////////////4

}
}
}

#if 0
while ((GPIOE->IDR&0XFF)!=0X0F);

#endif
return KeyVal;

}