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16f877a UART interrupt not triggering

 
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xyzsor



Joined: 19 Dec 2010
Posts: 12

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16f877a UART interrupt not triggering
PostPosted: Fri Apr 22, 2011 6:11 am     Reply with quote
Hey guys.. Im having problems making the UART interrupt work.. I searched the forum and everywhere else but i cant really find what's missing in my code.. Could anyone please please help me.. It would be of great help..


putc() and getc() works well on the main() function but it doesnt seem to work in the interrupt.. I dont know whats missing to make the interrupt trigger.. Thanks alot to anyone who helps..

Code:


#include <16F877A.h>
#device adc=8
#FUSES NOWDT   
#FUSES XT       
#FUSES PUT       
#FUSES NOPROTECT 
#FUSES NODEBUG   
#FUSES NOBROWNOUT
#FUSES NOLVP     
#FUSES NOCPD
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#priority rda
#byte portd=8               

int8 data;

#int_rda
void rda_isr(void)
{
    data = getc();
    putc(data);   
}

void main()
{
    enable_interrupts(INT_RDA);
    enable_interrupts(GLOBAL);

    set_tris_d(0x00);

   
    while(true)
    {      
    portd = 0xFF;
    delay_ms(300);
    portd = 0x00;
    delay_ms(300);
    }
}


PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Apr 22, 2011 1:01 pm     Reply with quote
It works for me. I tested it with compiler vs. 4.119 on a PicDem2-Plus
board. The board is connected to a PC which is running TeraTerm.

If I type a few keys to test it, it's working. It displays this on the terminal
window:
Quote:
asdfasdfasdfasfd
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