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kbhit problem

 
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Foppie



Joined: 16 Sep 2005
Posts: 138
Location: The Netherlands

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kbhit problem
PostPosted: Fri Sep 23, 2005 4:46 am     Reply with quote
Hello,

when I use kbhit() in my code after a printf() statement. I seem always to get TRUE as a result from kbhit(), even when I can't receive anything. Is that true, or is my code bugged? (I wrote it 4 times in different ways, but always get the same results....)

Can someone help me?

Code:
#device PIC16F877A *=16 ADC=10
#include <drivers/16f877.h>
#FUSES NOWDT       //No Watch Dog Timer
#FUSES HS       //High speed Osc (> 4mhz)
#FUSES NOPROTECT    //Code not protected from reading
#FUSES NOLVP       //Low Voltage Programming on B3
#FUSES NOCPD       //No EE protection
#FUSES NOWRT       //Program memory not write protected
#use delay(clock=20000000)
#use rs232(baud=9600, parity=n, bits=8, xmit=PIN_C6, rcv=PIN_C7, errors, stream=UWEAVE)

short checknetwork(int try)
// Input  : void
// Output : short - connected to network(1) or not connected(0)
// Action : connects to network
{
   short result, connected;
   int i;
   char data[80];

   i = 0;
   result = FALSE;
   connected = FALSE;
   
   lcd_gotoxy(1,1);
   printf(lcd_putc, "\fConnecting...");
   lcd_gotoxy(1,2);
   printf(lcd_putc, "try: %u", try);

   puts("ATE?");
   
   for(i = 0; ((i <= 79) && (!result)); i++)
   {
      while(!kbhit()) delay_us(10);
      data[i]=getc();
      if (i > 1)
         if ((data[i - 1] == 'O') && (data[i] == 'K'))
         {
            result = TRUE;
            connected = TRUE;
         }
      if (i > 4)
         if ((data[i - 4] == 'E') && (data[i - 3] == 'R') && (data[i - 2] == 'R') && (data[i - 1] == 'O') && (data[i] == 'R'))
            result = TRUE;
   }
   
   lcd_gotoxy(1,1);
   printf(lcd_putc, "\fdata: ", data);
   
   delay_ms(2000);
   
   return connected;
}

void main()
{
   lcd_init();

   //establish connection
   while(!checknetwork(i++));
   while(1);
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Sep 23, 2005 11:42 am     Reply with quote
My suggestion is, get rid of all the parsing code and write a small test
program. i.e., no more than 6 lines of code inside main().
If you can demonstrate the error, then post that program and also
post the version of your compiler.
Foppie



Joined: 16 Sep 2005
Posts: 138
Location: The Netherlands

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PostPosted: Mon Sep 26, 2005 2:49 am     Reply with quote
I now have it working using an interrupt.

Thanks for the advice to make a small test program first. I think I just wanted to much in once...
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