ledtest.c

在s3c2440开发板裸板上模拟软中断处理程序

#define	GPBCON		(*(volatile unsigned long *)0x56000010) //控制LED灯输入/输出寄存器地址
#define	GPBDAT		(*(volatile unsigned long *)0x56000014) //控制LED亮灭寄存器地址
#define LEDS   (1<<5|1<<6|1<<7|1<<8)  //LED全灭
#define DELAYVAL    (0xefff)  //延迟时间
	  
extern int delay(int time);  //延迟程序

int swi_led_on(int flag)
{	/*控制LED亮灯模式*/
	GPBCON	 = 0x00015400;
	GPBDAT=(GPBDAT|LEDS);
	switch(flag)
	{
		case 0:	GPBDAT=(GPBDAT&(~LEDS));break;
		case 1:	GPBDAT=(GPBDAT&(~LEDS)) | (1<<6|1<<7|1<<8);break;
		case 2:	GPBDAT=(GPBDAT&(~LEDS)) | (1<<5|1<<7|1<<8);break;
		case 3:	GPBDAT=(GPBDAT&(~LEDS)) | (1<<5|1<<6|1<<8);break;
		case 4:	GPBDAT=(GPBDAT&(~LEDS)) | (1<<5|1<<6|1<<7);break;
		default:GPBDAT=(GPBDAT|LEDS);	return -1;
	}
	return flag;
}

int swi_led_off(int flag)
{	/*控制LED熄灯模式*/
	GPBCON	 = 0x00015400;
	GPBDAT=(GPBDAT&(~LEDS));
	switch(flag)
	{
		case 1:	GPBDAT=(GPBDAT&(~LEDS)) | (1<<5);break;
		case 2:	GPBDAT=(GPBDAT&(~LEDS)) | (1<<6);break;
		case 3:	GPBDAT=(GPBDAT&(~LEDS)) | (1<<7);break;
		case 4:	GPBDAT=(GPBDAT&(~LEDS)) | (1<<8);break;
		default:GPBDAT=(GPBDAT|LEDS);	return -1;
	}
	return flag;
}