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mohannad100
Joined: 16 Jan 2008
Posts: 65
Location: iraq
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 21 Jun 2008 17:14 serial port connection failure |
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hi every body
im working on microcontroller projects using AT89C52 and the interfacing with pc is done through serial port ,im using a 12Mhz crystal ,baud rate 9600
the problem is the connection doesnot exist and the serial port doesnot read any thing from my microcontroller program
i need every possible help please.
thanks alot.
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medra
Joined: 15 Oct 2006
Posts: 99
Helped: 21
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| 21 Jun 2008 20:22 Re: serial port connection failure |
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dear mohannad, el salamo 3likom
I have attached a working hex file and the asm file for serial interfacing for AT89S52 it accepts a letter and sends the following letter, try it
if the problem still exists , you must check the conections.
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mezo
Joined: 16 Jul 2007
Posts: 60
Helped: 2
Location: Egypt
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| 18 Aug 2008 15:23 Re: serial port connection failure |
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you can use the functions :inp, outp . knowing the port number .
Here is the code :
#include<stdio.h>
#include<conio.h>
int main(void) {
unsigned port = 0x378 // first pin in parallel port 0x378-0x37f
int value ;
value = outp(port,'c') // c is the number you'll send to LPT
printf("value %c sent to port %d\n", value, port);
return 0 }
send me if you need anything .
Last edited by mezo on 25 Aug 2008 9:45; edited 1 time in total |
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amol_shah
Joined: 21 Apr 2008
Posts: 97
Helped: 12
Location: Nasik, Mumbai
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