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Problem with can't send data from PC to PIC 18f4550...

 
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kideltn



Joined: 08 Jun 2010
Posts: 13

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Problem with can't send data from PC to PIC 18f4550...
PostPosted: Sun Jun 27, 2010 11:39 am     Reply with quote
Hello every one!
Now i have a project with Pic 18f4550 and involved with RS232 interface
Problem is i just can tranfer data from PIC to PC but the contrary isn't.
Because pin RC7 is used for other purpuse so i used 2 pin RD0 and RD1 for rs232.
My connection RS232 schematic:
My code debug RS232:
Code:
#use rs232(baud=9600,parity=N,xmit=PIN_D0,rcv=PIN_D1,BITS =8,stream=GPS,ERRORS)
while(1){
   
    printf("TEST 232");//display OK
    data =getc();//wasn't worked ? (the Hyper terminal)
    fputc(data,GPS);
   }   

Please help me fix this mistake !
I expect will receive many helping.Thanks very much !
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Jun 27, 2010 2:14 pm     Reply with quote
The connections to your DB9 (connector P1) are not correct.
This thread has some links which show the correct connections:
http://www.ccsinfo.com/forum/viewtopic.php?t=32455

I Googled a little bit and found some more DB9 to Max232 schematics:
http://www.extremeelectronics.co.in/avrtutorials/images/rs232_sche.GIF
http://www.sparkfun.com/commerce/images/tutorials/BeginningEmbedded/4-UART/UART1.jpg
http://www.coolcircuit.com/circuit/rs232_driver/max232_small.gif
http://www.8051projects.net/e107_files/public/1208135039_5483_FT8010_circuit_232.jpg
jbmiller



Joined: 07 Oct 2006
Posts: 73
Location: Greensville,Ontario

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PostPosted: Sun Jun 27, 2010 2:58 pm     Reply with quote
Man I'd love to meet the guy who decided to swap the xmt and rcv pins when the DE-9 connector came out. I'm 'old school' and Pin Two is for Transmit , pin thrEe is for recEive..

WHY 'they' changed the standard is beyond me....

Oh well....
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Jun 27, 2010 3:50 pm     Reply with quote
It's designed to work with a "straight through" cable (The cable is wired
with pin 1 to pin 1, pin 2 to pin 2, etc.). That way, when you connect
a DTE (PC side) to a DCE (PIC board), the Tx on the PIC goes to the Rx
on the PC, etc.
kideltn



Joined: 08 Jun 2010
Posts: 13

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PostPosted: Sun Jun 27, 2010 6:00 pm     Reply with quote
Thanks you again !
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