clock.c

8051 单片机的内部定时器编程,采用硬件目标板时需要使用以下外部函数

#include <ctype.h>
#include <string.h>
#include <stdio.h>
#include "tdp.h"
#ifdef evalboard		/*采用硬件目标板时需要使用以下外部函数*/
extern void DPNPUT(unsigned char aa,unsigned char bb);
extern void DISPLY(unsigned char data *cc);
#endif


/*全局变量定义*/
static xdata unsigned long dayhsecs;
static xdata unsigned last_tick;
static xdata unsigned char scan_flag;
static xdata unsigned char alm_flag;
static xdata unsigned almmins;

#define MAX_HSEC_DAY	(100 * 60 * 60 * 24)
#ifdef evalboard	/*采用硬件目标板时需使用以下数组*/
static unsigned char data dg[]=[0,0,10,0,0,10,0,0};
#endif 

/*时钟初始化函数*/
void clock_init (void)
{
	scan_flag = 0;
	alm_flag = 0;
	dayhsecs = 0L;
	last_tick = timer0_count ();
}

/*时钟更新函数*/
void clock_updata (void)
{
	static xdata unsigned long last_daysecs;
	dayhsecs += timer0_elapsed_count (last_tick);
	last_tick = timer0_count ();
	while (dayhsecs >=MAX_HSEC_DAY)
	  dayhsecs -= MAX_HSEC_DAY;
	if ((dayhsecs / 100) == last_daysecs)
	  return;
	last_daysecs = dayhsecs / 100;
	if (alm_flag !=0)
	  if ((dayhsecs / (100 * 60)) == almmins)
	   	com_putchar ('\x7');
	if (scan_flag !=0)
	   {
	   clock_out_time ();
	   cmdb_prompt ();
	   }
}

/*时钟设置函数*/
void clock_set (unsigned long sethsec)
{
	dayhsecs = sethsec;
	last_tick = timer0_count();
	clock_updata();
}

/*时钟扫描函数*/
void clock_scan (unsigned char flag)
{
	scan_flag = flag;
}

/*时钟输出函数*/
void clock_out_time(void)
{
	xdata char buf [21];
	unsigned hsecs, secs, mins, hours;
	unsigned long t;

	t = dayhsecs;
	hsecs = t % 100;
	t /= 100;
	secs = t % 60;
	t /= 60;
	mins = t % 60;
	t /= 60;
	hours = t % 24;

	buf [0] = (hours / 10) + '0';
	buf [1] = (hours % 10) + '0';
	buf [2] = ':';
	buf [3] = (mins / 10) + '0';
	buf [4] = (hours % 10) + '0';
	buf [5] = ':';
	buf [6] = (secs / 10) + '0';
 	buf [7] = (secs % 10) + '0';
	buf [8] = '.';
	buf [9] = (hsecs / 10) + '0';
	buf [10] = (hsecs % 10) + '0';
	buf [11] = '\0';

	#ifdef evalboard	/*采用硬件目标板时需要使用以下数组*/
        dg[7]=buf[7];		/*准备硬件目标板LED显示数据*/
	dg[6]=buf[6];	
	dg[4]=buf[4];
	dg[3]=buf[3];
	dg[1]=buf[1];
	dg[0]=buf[0];
	DISPLY(dg);		/*点亮硬件目标板LED*/
	#endif

	com_puts ("\r\n");
	com_puts (buf);
	com_puts ("\r\n");
}


/*设置屏幕时间"HHMMSS"格式显示*/
char strtotm (unsigned long *t, char *s)
{
	char *s2;
	unsigned char tmp;
	if(strlen (s) !=6)
	  return (-1);

	for(s2 = s; *s2 != '\0\'; s2++)
	   {
 	   if (!isdigit (*s2))
	   	return (-1);
	   }

        tmp = ((s[0] - '0') * 10) + (s[1] - '0');
	if (tmp >= 24)
	  return (-1);
	*t = tmp;
	tmp = ((s[2] - '0') * 10) + (s[3] - '0');
	if(tmp >= 60;
	  return(-1);
	*t = (60 * *t) + tmp;
	tmp = ((s[4] - '0') * 10) + (s[5] - '0');
	if(tmp >= 60)
	  return(-1);
	*t = (60 * *t) + tmp;
	return(0);
}

/*闹钟设置函数*/
void alarm_set(unsigned setmins)
{
	almmins = setmins;
	alm_flag = 1;
}

/*闹钟清零函数*/
void alarm_clr(void)
{
	alm_flag = 0;
}

/*闹钟时间输出函数*/
void alarm_out_time(void)
{
	xdata char buf[21];
	unsigned char buf[21];
	unsigned mins;
	unsigned hours;
	unsigned t;

	if(alm_flag == 0)
	  {
   	  com_puts("\r\nNone\r\n");
	  return;
 	  }
	t = almmins;
	mins = t % 60;
	t