led.c

DSP5416时钟配制

#define SPSA0 *(unsigned int *)0x38
#define SPSD0 *(unsigned int *)0x39
#define	TIM		*(int *)0x24
#define	PRD     *(int *)0x25
#define	TCR		*(int *)0x26
#define	IMR		*(int *)0x0
#define	IFR		*(int *)0x1		
#define	PMST	*(int *)0x1d	

ioport unsigned int port8000;
ioport unsigned int port8007;

void interrupt time(void);

unsigned int uWork,nCount,nCountLed;
unsigned int uLed[12][2]={ {1,0x40},{2,0x40},{4,0x40},
						   {0,0x41},{0,0x42},{0,0x44},
						   {8,0x40},{0x10,0x40},{0x20,0x40},
						   {0,0x48},{0,0x50},{0,0x60},
						 };

main()
{
	port8000=0;		// 初始化ICETEK-CTR
	port8000=0x80;
	port8000=0;
	port8007=0;			// 关闭东西方向的交通灯
	port8007=0x40;	// 关闭南北方向的交通灯
	nCount=0; nCountLed=0;
	asm("	ssbx	INTM");	// 关中断，进行关键设置时不许打扰
	// 设置通用定时器
	uWork=PMST;			// 设置PMST寄存器
	PMST =uWork&0xff;	// 中断向量表起始地址=80H
	IMR = 0x8;			// 使能TINT
	TCR = 0x41f;		// 预分频系数为16
	TIM = 0;			// 时钟计数器清0
	PRD = 0x0f423;		// 周期寄存器为0ffH
	TCR = 0x42f;		// 复位、启动
	IFR = 0x100;		// 清中断标志位
	asm("	rsbx	INTM");	// 开中断
	while ( 1 );
      
}

void interrupt time(void)
{
	nCount++;
	if ( nCount>=4 )
	{
		nCount=0;
		port8007=uLed[nCountLed][0];	// 设置指示灯状态
		port8007=uLed[nCountLed][1];
		nCountLed++; nCountLed%=12;
	}
}