How to implement rs232 in C

[Wilko]

Hello All

Does anyone know of a good on-line tutorial that will teach/show me the way to program the required USART functions? I've seen quite a few sites teaching how to do it but there always in assembly language.

I tried using the MC18 library's but i really haven't the foggiest what I'm doing.

Thanks

Wilko

 

[Norlin]

found this site, it might be a good starting point for you http://www.viddata.com/bc_relay_hardware.htm
It's really a matter of figuring out the timing for the microcontroller you're using at the crystal speed you're using and the baud rate you're using.

 

[Wilko]

Thank you Norlin. Its definitely a useful insight but I was hoping for something a bit more explanatory.

I also should have said I wish to communicate a PIC18f4620 with a pc running hyper terminal.

I've already set up the circuitry between the MAX232A and PIC along with setting up the PC end of it. I've tested the output signal coming from the PC with a scope so its now purely a matter of coding the pic to receive a keyboard character and transmit something similar.

 

[Norlin]

ah, this chip has a built in eusart feature. Why not just use that? See section 18 of your datasheet