//This sample measures frequency and pulse width and generates a frequency
//using the 8254 counter/timer

#include <dos.h>
#include <conio.h>
#include "8254ctr.h"
#include <stdio.h>
unsigned AskForBaseAddress(unsigned int OldOne)
{
	char msg[7];
	int NewOne = 0, Success = 0, Dummy;
	int AddrInputPosX, AddrInputPosY;

	puts("Please enter the Base Address for your card (in hex)");
	printf("or press ENTER for %X.\n>", OldOne);
	AddrInputPosX = wherex(); AddrInputPosY = wherey();
	do {
		gotoxy(AddrInputPosX, AddrInputPosY);
		clreol();
		msg[0] = 5; msg[1] = 0;
		cgets(msg);
		sscanf(msg + 2, "%x", &NewOne);
		Success = 1;
		Dummy = NewOne;
		if (msg[1] == 0) {
			gotoxy(AddrInputPosX, AddrInputPosY);
			printf("%X", OldOne);
			Success = 1;
			Dummy = OldOne;
		}
	} while(!Success);
	return (Dummy);
} /* end of AskForBaseAddress */

unsigned AskForCountAddress(void)
{
	char msg[7];
	int NewOne = 0, Success = 0, Dummy;
	int AddrInputPosX, AddrInputPosY;

	puts("Please enter the offset for Counter 0 for your card (in hex).");
	printf(">");
	AddrInputPosX = wherex(); AddrInputPosY = wherey();
	do {     
		gotoxy(AddrInputPosX, AddrInputPosY);
		clreol();
		msg[0] = 5; msg[1] = 0;
		cgets(msg);
		sscanf(msg + 2, "%x", &NewOne);
		Success = 1;
		Dummy = NewOne;
	} while(!Success);
	return (Dummy);
} /* end of AskForCountAddress */

void main(void)
{
	unsigned freq=0;
	float time = 0;
	unsigned BASE = 0xFCA0;
	unsigned count = 0;
	clrscr();
	BASE=AskForBaseAddress(BASE);
	clrscr();
	count=AskForCountAddress(); //get counter offset
	BASE+=count;                //add counter offset to base address
	delay(100);
	puts("8254 Counter Sample");
	puts("--This program measures frequency and pulse width and generates frequency.");
	puts("--To measure frequency, connect a source to Clk IN on Pin 33.");
	puts("");
	puts("Press any key to continue.");
	getch();
	while(!kbhit()){
	  freq = freq;
	  time = frequency_measure(BASE);
	  printf("\nThe frequency is %10.3f\n\n", time);
	  puts("Press any key to continue to pulse width test.");
	  gotoxy(1,wherey()-4);
	}
	getch();
	clrscr();                //is this correct???
	puts("--To measure pulse width, connect a source to Gate 1 on Pin 34.");
	puts("--Without a source, pulse width will read zero.");
	puts("--Ground Pin 37.");
	puts("");
	puts("Press any key to continue.");
	getch();
	while(!kbhit()){
	  time = pulse_width(BASE);
	  printf(" Pulse1 %g \n", time);
	  delay(1000);
	  time = pulse_width(BASE);
	  printf(" Pulse2 %g \n", time);
	  delay(397);
	  time = pulse_width(BASE);
	  printf(" Pulse3 %g \n", time);
	  time = pulse_width(BASE);
	  printf(" Pulse4 %g \n", time);
	  delay(300);
	  time = pulse_width(BASE);
	  printf(" Pulse5 %g \n", time);
	  delay(10);
	  time = pulse_width(BASE);
	  printf(" Pulse6 %g \n\n", time);
	  puts("Press any key to continue to next test.");
	  gotoxy(1,wherey()-8);
  }
  getch();
  clrscr();
  while(!kbhit()){
	 puts("Generating frequency...");
	 puts("Verify signal by connecting a frequency meter to Out 2 on Pin 35.");
	 puts("Press any key to continue.");
	 generatefrequency(BASE, 25000);
	 gotoxy(1,wherey()-3);
  }
  getch();
	//delay(2000);
}