#ifndef KEYBOARD_H
#define KEYBOARD_H
//定义长标识符成较短的形式
#define SysCtlPeriEnable             SysCtlPeripheralEnable
#define SysCtlPeriDisable            SysCtlPeripheralDisable
#define GPIOPinTypeIn                GPIOPinTypeGPIOInput
#define GPIOPinTypeOutOD        GPIOPinTypeGPIOOutputOD

//行线使用GPIOB(0-3)1111
#define KEYBOARD_LIN_PERIPH        SYSCTL_PERIPH_GPIOB
#define KEYBOARD_LIN_BASE           GPIO_PORTB_BASE
#define KEYBOARD_LIN_PIN        0x0F                  
//列线使用GPIOC(4-7)1111
#define KEYBOARD_COL_PERIPH        SYSCTL_PERIPH_GPIOC
#define KEYBOARD_COL_BASE           GPIO_PORTC_BASE
#define KEYBOARD_COL_PIN       0xF0                            

#endif

 

 

uchar scanKeyboard(void)
{

 ulong scanValue[20]={0xEE,0xDE,0xBE,0x7E,
                     0xED,0xDD,0xBD,0x7D,
                     0xEB,0xDB,0xBB,0x7B,
                     0xE7,0xD7,0xB7,0x77,                                                         
                    };

 const ulong keyASC[20]={'1','2','3','4',
                            '5','6','7','8',
                            '9','10','11','12',
                            '13','14','15','16',
                        }; 

//定义变量及使能GPIOC和GPIOB    
ulong key,temp,temp1,temp2,temp3;
SysCtlPeripheralEnable(KEYBOARD_LIN_PERIPH);
SysCtlPeripheralEnable(KEYBOARD_COL_PERIPH);
//9个引脚全部上拉电阻有效
GPIOPadConfigSet(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_OD_WPU);
GPIOPadConfigSet(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_OD_WPU);
GPIOPinTypeOutOD(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN);       
GPIOPinTypeIn(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN);             
GPIOPinWrite(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN,0x00);           
temp1=GPIOPinRead(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN)& KEYBOARD_COL_PIN; 
                                 

GPIOPadConfigSet(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_OD_WPU);
GPIOPadConfigSet(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_OD_WPU);
GPIOPinTypeIn(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN);              
GPIOPinTypeOutOD(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN);            
GPIOPinWrite(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN,0x00);              
temp2=GPIOPinRead(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN)& KEYBOARD_LIN_PIN;  
temp=temp1 | temp2;                  

if(temp!=0xFF)                                          
{            
    SysCtlDelay(13*(SysCtlClockGet()/3000));
    GPIOPadConfigSet(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_OD_WPU);
    GPIOPadConfigSet(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_OD_WPU);
    GPIOPinTypeOutOD(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN);    
    GPIOPinTypeIn(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN);         
    GPIOPinWrite(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN,0x00);        
    temp1=GPIOPinRead(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN)& KEYBOARD_COL_PIN;
   
    GPIOPadConfigSet(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_OD_WPU);
    GPIOPadConfigSet(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_OD_WPU);
    GPIOPinTypeIn(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN);        
    GPIOPinTypeOutOD(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN);       
    GPIOPinWrite(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN,0x00);        
    temp2=GPIOPinRead(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN)& KEYBOARD_LIN_PIN;
  
 temp3=temp1 | temp2;
  
   if(temp3==temp)
    {
       for(key=0;key<20;key++) 
         if(temp==scanValue[key])
           {
             GPIOPinTypeIn(KEYBOARD_LIN_BASE,KEYBOARD_LIN_PIN);
             GPIOPinTypeIn(KEYBOARD_COL_BASE,KEYBOARD_COL_PIN); 
             return(keyASC[key]);        
           }
    }

  else

    {

      return('E');

    }
}
return ('N');
}