中断处理（中断向量寄存器）

#define GPNCON (*((volatile unsigned long *)0x7F008830))

#define GPNDAT (*((volatile unsigned long *)0x7F008834))

#define EINT0CON0 (*((volatile unsigned long *)0x7F008900))

#define EINT0MASK (*((volatile unsigned long *)0x7F008920))

#define EINT0PEND (*((volatile unsigned long *)0x7F008924))

#define PRIORITY (*((volatile unsigned long *)0x7F008280))

#define SERVICE (*((volatile unsigned long *)0x7F008284))

#define SERVICEPEND (*((volatile unsigned long *)0x7F008288))

#define VIC0IRQSTATUS (*((volatile unsigned long *)0x71200000))

#define VIC0FIQSTATUS (*((volatile unsigned long *)0x71200004))

#define VIC0RAWINTR (*((volatile unsigned long *)0x71200008))

#define VIC0INTSELECT (*((volatile unsigned long *)0x7120000c))

#define VIC0INTENABLE (*((volatile unsigned long *)0x71200010))

#define VIC0INTENCLEAR (*((volatile unsigned long *)0x71200014))

#define VIC0PROTECTION (*((volatile unsigned long *)0x71200020))

#define VIC0SWPRIORITYMASK (*((volatile unsigned long *)0x71200024))

#define VIC0PRIORITYDAISY (*((volatile unsigned long *)0x71200028))

#define VIC0VECTADDR0 (*((volatile unsigned long *)0x71200100))

#define VIC0VECTADDR1 (*((volatile unsigned long *)0x71200104))

#define VIC0ADDRESS (*((volatile unsigned long *)0x71200f00))

void eint0_3_irq(void)
//分辨组内哪个中断

{

int i;

printf("eint0_3_irq\n\r"); /* K1~K4 */

for (i = 0; i < 4; i ++)

{

if (EINT0PEND & (1<<i))

{

if (GPNDAT & (1<<i))

{

printf("K%d released\n\r", i+1);

}

else

{

printf("K%d pressed\n\r", i+1);

}

}

}

}

void eint4_11_irq(void)

{

int i;

printf("eint4_11_irq\n\r"); /* K5~K6 */

for (i = 4; i < 6; i ++)

{

if (EINT0PEND & (1<<i))

{

if (GPNDAT & (1<<i))

{

printf("K%d released\n\r", i+1);

}

else

{

printf("K%d pressed\n\r", i+1);

}

}

}

}

void irq_init(void)

{

/* 配置GPIO引脚为中断引脚 */

/* GPN0~5 设为中断引脚 */

GPNCON &= ~(0xfff);

GPNCON |= 0xaaa;

/* 设置中断触发方式为: 双边沿触发 */

EINT0CON0 &= ~(0xfff);

EINT0CON0 |= 0x777;

/* 使能中断 */

EINT0MASK &= ~(0x3f);

/* 在中断控制器里使能这些中断 */

VIC0INTENABLE |= (0x3); /* bit0: eint0~3, bit1: eint4~11 */

VIC0VECTADDR0 = eint0_3_irq;

VIC0VECTADDR1 = eint4_11_irq;



}

void do_irq(void)

{

int i = 0;

void (*the_isr)(void);

the_isr = VIC0ADDRESS;
//分辨哪个组中断

/* 2.1 分辨是哪个中断 */

/* 2.2 调用它的处理函数 */

/* 2.3 清中断 */

the_isr();

EINT0PEND = 0x3f; /* 清中断 */

VIC0ADDRESS = 0;

}