Apple-2-SW
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alarm-clock-6502
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alarm-clock-6502/alarm.clock.c

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#include <stdio.h> /* scanf */
#include <stdint.h> /* uint8_t */
#include <stdbool.h> /* true */
#include <ctype.h> /* toupper */
#include <conio.h> /* clrscr, kbhit */
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#include <time.h> /* time_t, struct tm */
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#include "noslotclock.h"
#include "time.h"
#include "trace.h"
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#define CLOCK_FREQUENCY 1023000L
#define CYCLES_PER_NOOP 2
#define NOOPS_PER_SEC 511500
#define CTRL_C '\x03'
#define ESC '\x1B'
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#define FMTD_TIME_SIZE 16
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void read_inputs(void);
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void sleep_one_second(void);
void do_nothing_for_one_second(void);
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void run_clock(void);
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static struct tm G_Current_Time;
static struct tm G_Alarm_Time;
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void main(void)
{
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TRACE_ENTER("main");
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load_driver();
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clrscr();
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read_inputs();
clrscr();
printf("\nAlarm Time: ");
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print_12_hour_time(&G_Alarm_Time);
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printf("\nCurrent Time: ");
run_clock();
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TRACE_EXIT("main");
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}
void read_inputs()
{
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TRACE_ENTER("read_inputs");
read_time(&G_Current_Time);
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puts("Alarm Time");
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read_time_interactively(&G_Alarm_Time);
TRACE_EXIT("read_inputs");
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}
void run_clock()
{
char c;
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TRACE_ENTER("run_clock");
print_12_hour_time(&G_Current_Time);
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while (true) {
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sleep_one_second();
reprint_12_hour_time(&G_Current_Time);
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if (kbhit()) {
c = cgetc();
if (c == ESC || toupper(c) == 'Q' || c == CTRL_C) {
puts("");
break;
}
}
}
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TRACE_EXIT("run_clock");
}
/**
* Waits for one second. Modifies the global G_Current_Time.
*/
void sleep_one_second()
{
time_t old_time;
TRACE_ENTER("sleep_one_second");
old_time = mktime(read_time(&G_Current_Time));
while (mktime(read_time(&G_Current_Time)) <= old_time) {
do_nothing_for_one_second();
}
TRACE_EXIT("sleep_one_second");
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}
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void do_nothing_for_one_second()
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{
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int i = 0;
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int max_loops;
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TRACE_ENTER("do_nothing_for_one_second");
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max_loops = NOOPS_PER_SEC / 250;
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for ( ; i < max_loops; ++i) {
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asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
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asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
}
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TRACE_EXIT("do_nothing_for_one_second");
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}