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Serial port woes

 
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may26baf_
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Serial port woes
PostPosted: Wed Oct 04, 2006 7:51 pm     Reply with quote

I'm working on an 18f6722, and I'm trying to read from the serial ports. I can read from the primary serial port with no problem, but I'm only able to read at most 3 characters from the secondary serial port. I'm hoping that someone can shed some light on why. (I know that there is a 3 char buffer, but that still doesn't explain why I can't get more than that.)

Here is the code that I'm using. Like I said, for PORT1, this works with no problem, but on PORT2, I can only get 3 characters. Suggestions?

#include <18f6722.h>
#device ICD=TRUE
#device ADC=10 // 10 bit a/d conversion
#fuses HS, NOLVP, NOWDT, PUT
#use delay (clock=4000000)

#use rs232 (baud=9600, xmit=PIN_C6, rcv=PIN_C7, stream=PORT1)
#use rs232 (baud=4800, xmit=PIN_G1, rcv=PIN_G2, stream=PORT2)

char buf1[120] = "";
char buf2[120] = "";
int8 buf1_idx = 0;
int8 buf2_idx = 0;

#int_rda
com_isr()
{
if( kbhit(PORT1) )
{
buf1[buf1_idx++] = fgetc(PORT1);
buf1_idx%=120;
}
if( kbhit(PORT2) )
{
buf2[buf2_idx++] = fgetc(PORT2);
buf2_idx%=120;
}
}

void main(void)
{
enable_interrupts(int_rda);
enable_interrupts(global);
while(TRUE)
{
if(buf2_idx > 5 )
{
led_on();
}
}
asmallri



Joined: 12 Aug 2004
Posts: 1636
Location: Perth, Australia

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PostPosted: Wed Oct 04, 2006 8:24 pm     Reply with quote

int_rda is the handler for the fist serial port. You need int_rda2 for the second serial port.
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