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Imanjl
Joined: 15 Nov 2004
Posts: 42
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| INT_RDA fails when using LCD & delay_ms() function!!!! |
 Posted: Tue Aug 08, 2006 3:20 pm |
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Hi guys,,
Im using PIC16f877A in some kind of MIDI Controller project,,,I completely confused ..when I send the data to rx pin of 16f877 ,Int_rda doesnt call. with deleting the delay_ms() or also Lcd_putc("test") the problem solve,,,
I knew that interrupt calls during the delay execution without using Lcd_putc("test") in the rda_isr() and lcd functions work well without using delay_ms in the main code too .but I want to use both.
whats the problem,,,,help me plz,
| Code: |
#device adc=8
#use delay(clock=10000000)
#fuses NOWDT,HS, NOPUT, NOPROTECT, NODEBUG, BROWNOUT,NOLVP, NOCPD, NOWRT
#use rs232(baud=31250,parity=N,xmit=PIN_c6,rcv=PIN_c7,bits=8)
#USE FASt_IO(C)
#USE FASt_IO(D)
#include <LCD>
#int_RDA
RDA_isr()
{
int data,i;
if (1==1) {data=getc();
putc(data);}
lcd_putc("test"); ////problem**
}
void main(){
SET_TRIS_C(0b10100000);
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
lcd_init() ;
loop :
delay_ms(500); //problem**
goto loop;
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Aug 08, 2006 3:39 pm |
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The compiler has inserted code to disable interrupts while the delay_ms()
function is being executed.
You can fix this by adding a 2nd #use delay statement right before main()
as shown below:
| Quote: |
#use delay(clock=10000000)
void main(){
SET_TRIS_C(0b10100000);
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL |
However, I believe you may still have problems with the isr because
you're doing an lcd_putc() for several characters. Depending on
how fast that code takes to execute, you may miss incoming chars
from your UART. |
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Imanjl
Joined: 15 Nov 2004
Posts: 42
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| Posted: Tue Aug 08, 2006 4:02 pm |
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tnx,,,It works now,,,,the problem solved by inserting #use delay(clock=10000000) ...
I try delay_US and see that the problem is just with delay_MS i dont know why compiler dont inserted code to disable interrupts in this case .
I dont have any problem with uart buferring cause it is not all my code and i send a few line ,,,,everything is ok thanks alot helping me |
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