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rs232 using 16f628

 
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Guest
rs232 using 16f628
PostPosted: Mon Oct 18, 2004 8:32 am     Reply with quote
hello.
how can i connect my pic16f628 with pc?

Code:

#include <16f628.h>
#fuses XT,NOWDT,NOPROTECT, NOPUT, NOBROWNOUT
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_B2, rcv=PIN_B1, parity=N, bits=8)

#include <stdlib.h>

void main()
{
     while(1)
     {
      puts("Hallo");
      delay_ms(500);
     }
}


what did i do wrong? thnx..
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Mon Oct 18, 2004 11:34 am     Reply with quote
Did ya use a RS232 transceiver chip? Did ya connect it via a Null modem cable (Tx(PIC)->Rx(PC) and Rx(PIC)->Tx(PC) and GND->GND)?
Guest
PostPosted: Mon Oct 18, 2004 2:15 pm     Reply with quote
Mark wrote:
Did ya use a RS232 transceiver chip? Did ya connect it via a Null modem cable (Tx(PIC)->Rx(PC) and Rx(PIC)->Tx(PC) and GND->GND)?


well i dont have a max232, im using a hex converter..
i have a null modem cable, but i just connect that (Tx(PIC)->Rx(PC) and GND-GND
Ttelmah
Guest
PostPosted: Mon Oct 18, 2004 3:55 pm     Reply with quote
Anonymous wrote:
Mark wrote:
Did ya use a RS232 transceiver chip? Did ya connect it via a Null modem cable (Tx(PIC)->Rx(PC) and Rx(PIC)->Tx(PC) and GND->GND)?


well i dont have a max232, im using a hex converter..
i have a null modem cable, but i just connect that (Tx(PIC)->Rx(PC) and GND-GND

A 'hex converter'?.
Do you mean a 'hex inverter'?. If so, this _may_ (sometimes) work, with some RS232 inputs, but is by no means guaranteed, and is well out of spec. RS232, really requires a -ve supply rail to be generated (the MAX232 does this for you). I'd suspect that your output, just does not get close enough to the RS232 requirements. Try with a MAX232...

Best Wishes
Guest
PostPosted: Tue Oct 19, 2004 9:21 am     Reply with quote
Ttelmah wrote:
Anonymous wrote:
Mark wrote:
Did ya use a RS232 transceiver chip? Did ya connect it via a Null modem cable (Tx(PIC)->Rx(PC) and Rx(PIC)->Tx(PC) and GND->GND)?


well i dont have a max232, im using a hex converter..
i have a null modem cable, but i just connect that (Tx(PIC)->Rx(PC) and GND-GND

A 'hex converter'?.
Do you mean a 'hex inverter'?. If so, this _may_ (sometimes) work, with some RS232 inputs, but is by no means guaranteed, and is well out of spec. RS232, really requires a -ve supply rail to be generated (the MAX232 does this for you). I'd suspect that your output, just does not get close enough to the RS232 requirements. Try with a MAX232...

Best Wishes


oh sry, yes i used a hex inverter.
but theres nothing wrong with the code?
thx
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Tue Oct 19, 2004 11:41 am     Reply with quote
Try this:

Code:


#include <16f628.h>
#fuses XT,NOWDT,NOPROTECT,PUT, NOBROWNOUT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_B2, rcv=PIN_B1)
       // Selected by default : parity=N, bits=8

//#include <stdlib.h>            // Not needed

void main()
{
  while(1)
       {
        printf("\r\nHallo");
        delay_ms(500);
       }
}


Best wishes

Humberto
Guest
PostPosted: Tue Oct 19, 2004 2:54 pm     Reply with quote
thanks 2 u all,
i'll try that on thursday.

thnx
dgjboy
Guest
Connect PIC <-> PC, easy option
PostPosted: Mon Oct 25, 2004 9:06 am     Reply with quote
Hi developers!

You can connect your PIC with a PC using next option (only for software UART and use INVERT directive):

PIC PC(RS232-9 pins)
*** ***************

TX ----4K7Resistor---- RX (2)

RX ----4K7Resistor---- TX (3)

And if you need a simple power supply for your circuit try it:

PC(RS232-9 pins)
***************

RST(4) ----1K------------------------------------ 5v
| |
GND(5) ----------Zener5v1----- ----
| ---- 100nF
| |
--------------------------------------- Gnd


Grettings
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