UART problem!

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UART problem!

 
0
  #1
Oct 31st, 2009
Hello I'm doing a program about UART in Borland C. And I have a few questions. This is the code:
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  1. #include <iostream.h>
  2. #include <dos.h>
  3. #include <conio.h>
  4. #include <stdio.h>
  5.  
  6. #define COM1 0x3F8
  7.  
  8. int main(void)
  9. {
  10.   clrscr();
  11.  
  12. //  outportb( COM1 + 1, 0 );
  13.   outportb( COM1 + 3, 0x83);
  14.   outportb( COM1, 0x0C);
  15.   outportb( COM1 + 1, 0x00);
  16.   outportb( COM1 + 3, 0x03);
  17.  
  18.   char ans;
  19.   char readValue;
  20.  
  21.   do
  22.   {
  23.  
  24. 	readValue = inportb( COM1 + 5 );
  25.  
  26. 	if ( readValue & 0x80 )
  27. 	{
  28. 	   printf("ERROR!");
  29. 	   continue;
  30. 	}
  31.  
  32. 	if ( readValue & 1 )
  33. 	{
  34. 	   readValue = inportb( COM1 );
  35. 	   printf("%c", readValue);
  36. 	}
  37.  
  38. 	if ( kbhit() )
  39. 	{
  40. 	   ans = getch();
  41. 	   outportb( COM1, ans );
  42. 	}
  43.  
  44.  
  45.   } while ( ans != 27 );
  46.  
  47.  
  48.   return 0;
  49.  
  50. }
The program reads char data from the COM1 port, and finds if there's any errors.
My question is how to simplify this program, or write it in different way. I need to present two different codes and I don't have idea for the second one.
Thanks!!!
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0
  #2
Oct 31st, 2009
Does the second program have to do the same thing as the first but must be written differently?
You could always do a switch on readValue instead of the if tree.
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  #3
Oct 31st, 2009
Yes the second one should do the same as the first one, only I need it written with different commands or simply in different way.
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  #4
Nov 3rd, 2009
Can someone give me some example?
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