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RodeKlu
Joined: 31 May 2005
Posts: 2
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| int_rda |
 Posted: Tue May 31, 2005 11:31 am |
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Hi All,
I'm having trouble with the rda interrupt. I checked the communication with this program:
| Code: | // type of pic
#include <16F628.h>
// osc., no watchdog, power up timer,no protect
#fuses XT,NOWDT,PUT,NOPROTECT
// progr id V 100
#id 0x0100
// 4 MHz clock
#use delay (clock=4000000)
#use rs232 (baud=9600, parity=N, bits=8, rcv=PIN_B1)
#define LED PIN_B7
short select=FALSE;
void main(void){
while(TRUE){
if (kbhit()){
getc();
if(select){
select = FALSE;
output_low(LED);
}else{
select = TRUE;
output_high(LED);
}
}
}
} |
It worked so I changed it to:
| Code: | // type of pic
#include <16F628.h>
// osc., no watchdog, power up timer,no protect
#fuses XT,NOWDT,PUT,NOPROTECT
// progr id V 101
#id 0x0101
// 4 MHz clock
#use delay (clock=4000000)
#use rs232 (baud=9600, parity=N, bits=8, rcv=PIN_B1)
#define LED PIN_B7
short select=FALSE;
#int_rda
void rda_isr(void){
int receive;
receive=getc();
if(select){
select = FALSE;
output_low(LED);
}else{
select = TRUE;
output_high(LED);
}
return;
}
void main(void){
enable_interrupts(global);
enable_interrupts(int_rda);
while(TRUE){
delay_ms(1000);
}
} |
And that code did not do what I expected.
Does anybody know what I'm doing wrong?
Thanks,
Rob. |
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rwyoung
Joined: 12 Nov 2003
Posts: 563
Location: Lawrence, KS USA
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| Posted: Tue May 31, 2005 1:44 pm |
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Confirm that the compiler is using the hardware UART. Since you didn't specify the transmit pin in your #use rs232 statement I'm not sure what the compiler will generate. Specify the appropriate pin for transmit, PIN_B2 I believe.
Then check your LST file to see if the code generated for your getc and kbhit is using the UART registers or if it is calling bit-banging code.
_________________
Rob Young
The Screw-Up Fairy may just visit you but he has crashed on my couch for the last month! |
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Guest
Guest
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| Posted: Tue May 31, 2005 2:05 pm |
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Yes, perhaps you are defaulting to a software interrupt. Try to ensure the hardware USART is used by explicityly giving proper Rx and Tx pins. Try this
#USE RS232(BAUD=9600, XMIT=PIN_B2, RCV=PIN_B1, ERRORS) |
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kender
Joined: 09 Aug 2004
Posts: 768
Location: Silicon Valley
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| Posted: Tue May 31, 2005 11:17 pm |
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You might be missing characters when you are in the delay_ms(1000).
What kind of missbehavior are you getting? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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RodeKlu
Joined: 31 May 2005
Posts: 2
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| Posted: Wed Jun 01, 2005 5:54 am |
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I added the transmit line and it worked fine. The other posts answer my question if I could still use the transmit line in another way. I can.
Thanks for the help,
Rob. |
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