Ночник на AT89C2051

/*
   Lamp.c
   night light saver V6.0, 89C2051 runs with 3.579MHz xtal
   The source code was compiled with sdcc.
Copyright (C) 2004 Wichit Sirichote, kswichit@kmitl.ac.th, 20 December 2004
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

*/
#include <at89x051.h>
#define tick_test P3_0 // 10Hz/2 output for clock calibration
#define LED P3_7
#define output1 P1_6
char status;
int count, i;
char tick, flag1, temp, timer1, timer2;
char hour,min,sec,sec10;
// you may press set time button whenever you want the lamp turns on
// for winter season you may press ealier than local time
// for summer more late, time will shift relatively!
// period will be 22:00 - 18:00 = 4 hours
code char time_on1[] = {18,00};
code char time_off1[] = {22,00};
// another scheduler, the 3rd byte will write to P1
// you may replace control_output function by scan_pgm function
code char pgm1[]={18,00,0x80,19,00,0,20,0x80,1,21,00,0};
char _sdcc_external_startup()
{
return 1; // skip static and global variables initialization
}
scan_pgm()
{
char i;
for(i=0; i<4; i++)
{
if(hour == pgm1[i*3] && min == pgm1[i*3+1])
P1 = ~pgm1[i*3+2];
}
}
control_output()
{
if(hour == time_on1[0] && min == time_on1[1])
status = 0;
if(hour == time_off1[0] && min == time_off1[1])
status = 1;
}
blink_led()
{
if(flag1&1)
{
if(++timer1>1)
{
flag1 &= ~1; // clear flag1.0
timer1=0;
LED = 1; // turns off led
}
}
}
void time ()
/* update real-time clock */
{
if (++sec10 >= 10) /* 100ms * 10 = 1 s */
{
LED = 0;
control_output(); // control output every second
sec10 = 0;
flag1 |=1;
if (++sec >= 60)
{sec = 0;
if (++min >= 60)
{min = 0;
if (++hour >= 24)
{hour = 0;
}
}
}
}
}
set_time()
{
if((P3&4)==0)
{
status = 0;
hour = 18;
min = 0;
sec = 0;
timer2=0;
}
}
update_output()
{
if(status) output1 = 1;
else output1 =0; // update output bit
}
void timer_isr(void) interrupt 1 using 1
{
TH0 = 0x8b;
TL0 = 0x7f; // reload with 35711 for 10Hz
tick++;
tick_test ^= 1; // test tick for 10Hz/2 or 5Hz
time();
set_time();
blink_led();
update_output();
}
main()
{
TMOD = 0x01; // timer1 and timer0 = mode 1
EA = ET0 = TR0 = 1; // enable timer0 interrupt, start timer
PCON |= 1; // enable IDLE mode, to extend backup period
for(;;)
;
}