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serial port connection failure

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mohannad100

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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.
 

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.
 



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 .

 

first of all you cannot get exact 9600 bps when you use 12Mhz crystal, for generating exact 9600bps you require to use 11.0592Mhz crystal.
Maybe there is a problem in you code, post your code so that we can help, or check this link for working code fore serial communication
https://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/Serial-Communication.html
https://www.dnatechindia.com/index.php/Code-Library/8051_ASSEMBLY/Serial-Communication.html

Are you using hyper terminal? for hyper terminal setting:
https://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/HYPERTERMINAL.html
 

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