/*---------------------------------------------------------------------------------------------------------------

FILE NAME      : TIME0_TIMER.C

DEscrīptION  : 使用定时器0实现1秒定时,控制LED闪烁。

---------------------------------------------------------------------------------------------------------------*/

//----------------------------------------------------Include files---------------------------------------------//

#include  <lpc2103.h>

//-----------------------------------------------------Variable ------------------------------------------------//

//------------------------------------------------Function prototype-----------------------------------------//

//---------------------------------------------------Function ---------------------------------------------------//

//---------------------------------------------------Define-----------------------------------------------------//

#define         LEDCON        0x00002000                  /* P0.13引脚控制LED，低电平点亮*/

/*-------------------------------------------------------------------------------------------------------------------

NAME                : time0init()

FUNCTION        : 初始化定时器0，实现0.5S定时

ENTRY  TYPE : void

RETURN TYPE : void

PURPOSE          :

VERSION           : 0.0.0

DEscrīptION  :

CREATE DATE : 12.07.2006

LOGS                  :--\

- 1.create;

------------------------------------------------------------------------------------------------------------------*/

  void time0init(void)

{

    /* 初始化定时器0，实现1S定时

            Fcclk=Fosc*4=11.0592MHz*4=44.2368MHz

            Fpclk=Fcclk/4=44.2368MHz/4=11.0592MHz*/

         T0TC=0;                      //定时器设置为0

         T0PR = 99;                     // 设置定时器分频为100分频，得110592Hz

         T0MCR = 0x03;               // 设置T0MR0匹配后复位T0TC,并产生中断标志

         T0MR0 = 110592/2;         // 设置0.5s匹配值

         T0TCR = 0x01;                 // 启动并复位T0TC

}

/*-----------------------------------------------------------------------------------------------------------------

NAME                : main()

FUNCTION        : 控制LED闪烁

ENTRY  TYPE : void

RETURN TYPE : int

PURPOSE          :

VERSION           : 0.0.0

DEscrīptION  :

CREATE DATE : 12.07.2006

LOGS                  :--\

- 1.create;

-------------------------------------------------------------------------------------------------------------------*/

int  main(void)

{  PINSEL0 = 0x00000000;                   // 设置所有管脚连接GPIO

   PINSEL1 = 0x00000000;

   IODIR = LEDCON;                                    // 设置LED控制口为输出

   time0init();                                // 定时器0初始化

   while(1)        

   { 

      while( (T0IR&0x01) == 0 );                               // 等待定时时间到

      T0IR = 0x01;                                                                // 清除中断标志

      if( (IOSET&LEDCON) == 0 ) IOSET = LEDCON;        // 控制LED点亮

        else  IOCLR = LEDCON;                                           // 控制LED熄灭

   }

   return(0);

}

//----------------------------------------------- End of file -------------------------------------------------//