【OK210试用体验】裸奔GPIO输入&KEY

除是普通引脚的输入外，还可以用外部中断
普通引脚输入读取 代码如下
#define MP0_4CON (*(volatile unsigned long *)0xE0200340)
#define MP0_4DAT (*(volatile unsigned long *)0xE0200344)
#define MP0_4PUD        (*(volatile unsigned long *)0xE0200348)
#define GPD0CON   (*(volatile unsigned long *)0xE02000A0)//buzzer
#define GPD0DAT (*(volatile unsigned long *)0xE02000A4)//buzzer
#define GPH0CON   (*(volatile unsigned long *)0xE0200C00)//key
#define GPH0DAT   (*(volatile unsigned long *)0xE0200C04)//key
void init(void)
{
    GPD0CON&= ~(0xF << 0);
    MP0_4CON = (MP0_4CON & ~0xFFFF0000) | 0x11110000;
    MP0_4PUD=(0x55<<16)&MP0_4PUD;
    MP0_4DAT =0xf<<4;
    GPH0CON &=0x00000FFF;
}
void main(void)
{
    init();
while(1)//循环检测按键是否按下
{
  if(GPH0DAT &(1<<3))//按键1未按下 k1  back
  {
   MP0_4DAT |=1<<4;//off
  }
  else//按键1按下
  {
   MP0_4DAT &=~(1<<4);//on
  }
     if(GPH0DAT &(1<<4))//k2  home
  {
   MP0_4DAT |=1<<5;//off
  }
  else
  {
   MP0_4DAT &=~(1<<5);//on
  }
         if(GPH0DAT &(1<<5))//k3 menu
  {
   MP0_4DAT |=1<<6;//off
  }
  else
  {
   MP0_4DAT &=~(1<<6);//on
  }
         if(GPH0DAT &(1<<6))//k4 power
  {
   MP0_4DAT |=1<<7;//off
  }
  else
  {
   MP0_4DAT &=~(1<<7);//on
  }
  if(GPH0DAT &(1<<7))//k5    search
  {
   MP0_4DAT |=0xf<<4;//all off
  }
  else
  {
   MP0_4DAT &=~(0xf<<4);//all on
  }
}
}