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rs232 communication from 16f84a [SOLVED]

 
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vladtess



Joined: 14 May 2011
Posts: 26

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rs232 communication from 16f84a [SOLVED]
PostPosted: Sat May 14, 2011 11:22 am     Reply with quote
Hi fellas!

I have this simple code: I want to transmit letter 'A' via software UART.

Code:
#include <16F84A.h>
#FUSES hs,nowdt,noprotect
#use delay (clock = 4000000)
#use rs232(baud=300,xmit=PIN_B0, rcv=PIN_B1,invert, parity=n, bits = 8, force_sw)


void main() {
   set_tris_b(0x0);
   while(1){
    delay_ms(1000);
    putc('A');
   }
   
}


I delay a second to not get confused about when data is sent. I use invert because max232 needs too many caps and gets too messy on my breadboard. pic and PC (rs232 pin 5) grounds are connected. the receive pin is connected to pin 2 of the rs232 connector to PC and PortB pin 0 on PIC.

I use RS-232 Monitor version 1.2 to monitor incoming. On this software I set baud to be 600, with no parity, 8 bit reception, 1 stop bit, and no other feature turned on.

I get signal, with intervals of close to 1 secs as expected. However I get trash: a black box with a p.

Pleas help!! Screenshot is attached.

Maybe I should use some other software to monitor incoming signals?

Thanks much you all!!!

Last edited by vladtess on Sat May 14, 2011 11:44 am; edited 1 time in total
vladtess



Joined: 14 May 2011
Posts: 26

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PostPosted: Sat May 14, 2011 11:26 am     Reply with quote
Oh my, I got it, baud on monitor was 600 while pic was set to operate at 300. My mistake. Lesson to all including me: check baud rate!!

Sorry to take up space on forum.
bkamen



Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA

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PostPosted: Sat May 14, 2011 11:29 am     Reply with quote
vladtess wrote:
Oh my, I got it, baud on monitor was 600 while pic was set to operate at 300. My mistake. Lesson to all including me: check baud rate!!

Sorry to take up space on forum.


No worries... Change the original Subject line to include "SOLVED" so others may learn from what you did.

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D
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