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McNerd
Guest
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| Having no luck with pic to pic rs232 |
 Posted: Tue Oct 28, 2008 10:32 pm |
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I've searched using several queries and read the first five pages of each search, and I'm still not having luck with pic to pic rs232. Here's my source:
| Code: | #include <12F508.h>
#USE DELAY (clock=4mhz)
#USE STANDARD_IO (ALL)
#USE rs232(BAUD=9600,XMIT=PIN_B4,RCV=PIN_B5,PARITY=N,BITS=8)
#FUSES INTRC, NOWDT, NOMCLR, NOPROTECT
#DEFINE PORTB 6
void write()
{
char d=0,len;
for(;;d++)
{
putc(d);
if (d==7) d=0;
delay_ms(500);
}
}
void read()
{
char d=0;
for(;;)
{
while(!kbhit());
d=getc();
*PORTB=d;
}
}
void main()
{
#asm
movlw 223
option
#endasm
write();
//read();
} |
The asm lets me use pin b2, but you already knew that... as an aside, any "c" way to do that ? Anyway, I have b4 connected to b5 and vice versa. I've tried pulling the lines high and/or low, as well as not pulled at all. perhaps i'm using too high/low values of resistors. For one, it seems as if the tris values are not being set automatically as they should. I had set trisb to 0, and I had activity on b4 as appropriate, however, as soon as i eliminated that line I am seeing no activity of any kind. That will be the last thing I try before I hit the sack tonight. Tris of b4 goes to 0 and b4 needs a 1, correct ? I am certain this is an obnoxiously simple problem, and I was leaning toward it being a hardware/hookup problem until this tris thing reared it's head. Anyways, thanks in advance for any help |
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McNerd
Guest
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| having no luck with pic to pic rs232 |
| Posted: Tue Oct 28, 2008 11:08 pm |
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set up tris manually and it works fine. I feel soooooooo retarded. i tried this on a whim a while ago and i must not have powered the chip down and back up...
i thought using #USE STANDARD_IO (ALL) made it so i could ignore tris ?
odd... |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Oct 28, 2008 11:19 pm |
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| Quote: | | I thought using #USE STANDARD_IO (ALL) made it so i could ignore tris ? |
That only works if you use the CCS i/o functions.
You're writing directly to Port B:
You should be doing this:
Then the TRIS will be handled automatically. |
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McNerd
Guest
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| God i'm an idiot |
| Posted: Tue Oct 28, 2008 11:30 pm |
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You see........ i've never done it that way before. "that way" being standard_io/output_x() always use fast_io........
oh well, i set the tris and dumped standard_io. my usual. and it works like a charm. pretty cool stuff man. |
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