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pattousai
Joined: 23 Aug 2006
Posts: 37
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| one more serial problem - getc() doesn't work |
 Posted: Wed Nov 15, 2006 3:19 pm |
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hi everybody, sorry for the bothering over such a discussed subject
but, i'm trying to make a connection pic-pc
i can send a message from the pic to the pc, but when i try to get a character from the pc to the pic it just doesn't work.
here is one of my code
| Code: |
#include <16F877a.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, parity=N, xmit=PIN_b6, rcv=PIN_b7, bits=8, invert) // Jumpers: 8 to 11, 7 to 12
void main() {
char x;
printf("\r\n-----LIGADO-----");
while(TRUE){
if( kbhit() ){
x = getc();
delay_ms(100);
putc(x);
}
}
}
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i already try to send only one chatacter with putc('a'), and works fine
i think that's it.
hope that anyone can help me!!
thanks, and sorry for the bad english |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Nov 15, 2006 3:37 pm |
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See this post regarding the use of a series resistor when using INVERT.
http://www.ccsinfo.com/forum/viewtopic.php?t=26592&highlight=invert+resistor&start=10
Also, your program will work if you are slowly typing characters on
your PC keyboard. But if you send a message to the PIC with no
spacing between the characters, the 100 ms delay in your program
will cause the PIC to miss characters. |
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BOB_SANTANA
Joined: 16 Oct 2006
Posts: 110
Location: HOVE, EAST SUSSEX
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| Posted: Wed Nov 15, 2006 3:39 pm |
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just ran your code and it works but i am using hardware uart as below
#if defined(__PCM__)
#include <16F877.h>
#ORG 0x1F00,0x1FFF {} // use boot loader for the 8k 16F877
#fuses XT,NOWDT,NOPROTECT,BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7,ERRORS) //
_________________
BOB_Santana  |
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pattousai
Joined: 23 Aug 2006
Posts: 37
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| Posted: Thu Nov 16, 2006 7:41 am |
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i miss the
| Code: | | #ORG 0x1F00,0x1FFF {} // use boot loader for the 8k 16F877 |
part, why is that??
and, when i try tu use the uart, i can't even send messages to the pc. when i try to do that what i have is garbage.
i use the max232 IC, with the configuration just like is this topic:
http://www.ccsinfo.com/forum/viewtopic.php?t=25905
as for the resistor, i will try that.
thanks to everybody |
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Ttelmah
Guest
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| Posted: Thu Nov 16, 2006 8:23 am |
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With the MAX232, get rid of the 'INVERT' keyword. The MAX232, contains the required hardware inverter.
Best Wishes |
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pattousai
Joined: 23 Aug 2006
Posts: 37
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| Posted: Fri Nov 17, 2006 9:20 am |
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| Ttelmah wrote: | With the MAX232, get rid of the 'INVERT' keyword. The MAX232, contains the required hardware inverter.
Best Wishes |
exactly, but when i do that i'm getting only garbage
that's why i'm don't using the uart |
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