RS232 problem -- pas2pic

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Subject: RS232 problem

Author:
Per Medin

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Date Posted: 08:57:01 06/09/03 Mon

Hello

I have some problems with the RS232 interface, my PIC is a 16F873 and i have a MAX232 to fix the signal levels.

I'm using the following code to test the port, but i can't get it to work.

processor 16F873;

cfgword cp_off,pwrte_on,wdt_off,hs_osc,lvp_off,bod_off;

uses rs232;

procedure main;
Var r;

begin
RS232_Init(1);

Repeat
If RS232_IsData Then
Begin
r := RS232_Receive;
RS232_Send(r);
End;
Until False;

end;

I'm using a 4Mhz resonator and have set SPBRG:=25; (2400bps). If i make a jumper between in and out pin on MAX232's 5v side it echo's what i send, but the PIC doesn't. I know that the code RS232_IsData never gets true (i have tested with a led on port A).
Is there anyone who has some suggestions of what i may have done wrong.

And now to something totally different.
I have made my own variant of the lcdunit which uses totally 6 pins on the PIC (4pin interface 4pin control)
If anyone is interested please drop me a mail.

Per Medin

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Replies:

Subject	Author	Date
Re: RS232 problem	Jano	09:39:57 06/10/03 Tue