89C52 Serial Interface

[Help]

Hi,

Anyone can help me about the serial interfacing with using RS232?
Where/how can i get a simple C code with trying interfacing?
I just need to use PC to control my uC I/O port only.... Do you got any sample code for it?

Thanks...

 

[IanP]

To SET or RESET microcontroller pins you can consider sending commands which may look like the following:
<D0HChSumCR
where:
< start character
D = Digital pin (microcontroller may have alos Analog inputs ..)
0 = pin number, for example P0.0
ChSum = '<' XOR D XOR 0
CR Carrige Return, End character

I don't have examples in C, but if you are intersted I can post/e-mail working assembly code for 8051-derivative with this protocol ..
You can always insert this code to your C application (#asm ... code ... #endasm) ..
At the other end (PC) you will need to use hyperterminal or any other terminal software that will allow you to compose and send strings with these commands ..
In Hyperterminal you can just type them from keyboard, in programs such as INTERM ( h**p://www.rfinnovations.com.au/Uploads/Images/RFI-Interm%20Rev1.1(1).zip ; replace ** with tt, then copy and paste the whole thing into the explorer's address icon ) you can create strings consisting of several ASCII or HEX characters and send them out by pressing single button ..
Regards,
IanP

 

[ctownsend]

This may help you.

You can find lots of info in the code library at
http://www.8052.com

 

[sarang1_in]

**broken link removed**

regrads
Sarang