test2.c

频率计,用arm7实现。 核心芯片为S3C44B0, 用以实现对外部信号的频率计数

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

FILE NAME      : COUNTER.C

DEscrīptION  : 定时器用作计数器，用于对外部脉冲进行计数。



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

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

#include  "lpc2103.h"

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

 

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

 

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

 

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

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

NAME                : capture() 

FUNCTION        : Timer1的计数器实验——CAP1.3下降沿

ENTRY  TYPE : void

RETURN TYPE : int

PURPOSE          : 

VERSION           : 0.0.0

DEscrīptION  : 

CREATE DATE : 12.07.2006

LOGS                  :--\

- 1.create;

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

int capture(void)

{ 

  PINSEL1=1<<5;               //P0.18连接捕获1.3

  T1CCR=1<<11;                //设置CAP1.3沿捕获

  T1CTCR =(0x02<<0)|      //计数器，在CAP的下降沿递增

                (0x03<<2);     //选择CAP1.3    

  T1TC=0;

  T1TCR = 0x01;                 //启动定时器,对外部脉冲开始计数

 

  while(1);

  return(0);  


}

 

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