以下是主要代码：

1.led.c

#define GPBCON (volatile unsigned long*)0x56000010
#define GPBDAT (volatile unsigned long*)0x56000014

void led_init()
{   
    *(GPBCON) = 0x400;
}

void led_off()
{
    *(GPBDAT) = 0x7ff;
}

void led_on()
{
    *(GPBDAT) = 0x0;
}

2.interrupt.c

/*interrupt registes*/
#define SRCPND              (volatile unsigned long *)0x4A000000
#define INTMOD              (volatile unsigned long *)0x4A000004
#define INTMSK              (volatile unsigned long *)0x4A000008
#define PRIORITY            (volatile unsigned long *)0x4A00000c
#define INTPND              (volatile unsigned long *)0x4A000010
#define INTOFFSET           (volatile unsigned long *)0x4A000014
#define SUBSRCPND           (volatile unsigned long *)0x4A000018
#define INTSUBMSK           (volatile unsigned long *)0x4A00001c

#define EINTMASK            (volatile unsigned long *)0x560000a4
#define EINTPEND            (volatile unsigned long *)0x560000a8

void init_irq()
{

    // 在EINTMASK寄存器中使能它们
    *(EINTMASK) &= (~(1<<8)) & (~(1<<11)) & (~(1<<13)) & (~(1<<14));

    // EINT8_23使能
    *(INTMSK)   &= ~(1<<5);
    
    __asm__(
    /*开中断*/  
    "mrs r0,cpsr\n"
    "bic r0, r0, #0x80\n"
    "msr cpsr_c, r0\n"            
    :
    :
  );
}

void handle_int()
{
    /*读取产生中断的源*/
    unsigned long value = http://www.mamicode.com/*(EINTPEND) & ((1<<8)|(1<<11)|(1<<13)|(1<<14));
    
    switch(value)
    {
        case (1<<8): //K1
            led_on();
            break;
        
        case (1<<11): //K2
            led_off();
            break;
        
        case (1<<13): //K3
            led_on();
            break;
        
        case (1<<14): //K4
            led_off();
            break;
        
        default:
            break;
    }
    
    /* 中断清除 相应的位 1 */
    *(EINTPEND) = value;
    
    *(SRCPND) = 1 << 5;
    *(INTPND) = 1 << 5;
}

3.button.c

#define GPGCON  (volatile unsigned long *)0x56000060

/*
 * K1,K2,K3,K4对应GPG0、GPG3、GPG5、GPG6
 */
#define GPG0_int     (0x2<<(0*2))
#define GPG3_int     (0x2<<(3*2))
#define GPG5_int     (0x2<<(5*2))
#define GPG6_int     (0x2<<(6*2))

#define GPG0_msk    (3<<(0*2))
#define GPG3_msk    (3<<(3*2))
#define GPG5_msk    (3<<(5*2))
#define GPG6_msk    (3<<(6*2))

void button_init()
{   
        *(GPGCON) &= ~(GPG0_msk | GPG3_msk | GPG5_msk | GPG6_msk);
    *(GPGCON) |= GPG0_int | GPG3_int | GPG5_int | GPG6_int;
}

@以上代码仅供参考。

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