elapsed.c

嵌入式系统基础课件

/* February 14, 2002: Corrected value of 3rd parameter of SendPacket call from 11 to 10. 
   Found by Jianpeng Dong, MSCE student, Santa Clara University.
*/
#define	PATCH_2_14_2002

#include "libepc.h"
#include "os_cpu.h"
#include "os_cfg.h"
#include "ucos_ii.h"
#include "packet.h"
#include "elapsed.h"

PRIVATE char *AsciiTime(TIME *elapsed) ;
PRIVATE void UpdateTime(TIME *elapsed) ;

PRIVATE OS_EVENT *time_queue = NULL ;

PRIVATE void TimeCreateQ(void)
	{
	static void *time_q[20] ;

	if (!time_queue)
		{
		time_queue = OSQCreate(time_q, ENTRIES(time_q)) ;
		}
	}

void PostTime(BYTE8 *bfr)
	{
	TimeCreateQ() ;
	OSQPost(time_queue, bfr) ;
	}

void InboundTime(void)
	{
	WINDOW *w ;

	w = (WINDOW *) WindowCreate("Remote", 11, 13, 56, 69) ;
	if (!w) return ;
	TimeCreateQ() ;

	for (;;)
		{
		BYTE8 err ;
		char *bfr ;

		bfr = OSQPend(time_queue, 0, &err) ;
		WindowSetCursor(w, 0, 1) ;
		WindowPutString(w, bfr) ;
		free(bfr) ;
		}
	}

void ElapsedLocal(void)
	{
	WINDOW *w ;

	w = (WINDOW *) WindowCreate("Local", 11, 13, 10, 23) ;
	if (!w) return ;

	for (;;)
		{
		static TIME elapsed = {0, 0, 0, 0} ;
		char *bfr ;

		/* Update the display */
		WindowSetCursor(w, 0, 1) ;
		bfr = AsciiTime(&elapsed) ;

#ifdef	PATCH_2_14_2002
		SendPacket(2, bfr, 10) ;
#else
		SendPacket(2, bfr, 11) ;
#endif

		WindowPutString(w, bfr) ;

		OSTimeDly(100) ; /* Sleep for about .1 second */

		/* update elapsed hours, minutes, and seconds */
		UpdateTime(&elapsed) ;
		}
	}

PRIVATE void UpdateTime(TIME *elapsed)
	{
	int ticks = OSTimeGet() ;

	elapsed->tenths = ticks / 100 ;
	elapsed->secs = elapsed->tenths / 10 ;
	elapsed->tenths %= 10 ;
	elapsed->mins = elapsed->secs / 60 ;
	elapsed->secs %= 60 ;
	elapsed->hours = elapsed->mins / 60 ;
	elapsed->mins %= 60 ;
	}

PRIVATE char *AsciiTime(TIME *elapsed)
	{
	static char _bfr[] = "XX:XX:XX.X" ;
	char *bfr ;

	bfr = FormatUnsigned(_bfr, elapsed->hours, 10, 2, '0') ;
	*bfr++ = ':' ;
	bfr = FormatUnsigned(bfr, elapsed->mins,  10, 2, '0') ;
	*bfr++ = ':' ;
	bfr = FormatUnsigned(bfr, elapsed->secs,  10, 2, '0') ;
	*bfr++ = '.' ;
	FormatUnsigned(bfr, elapsed->tenths, 10, 1, '0') ;
	return _bfr ;
	}