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Software UART problem.

 
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Guest
Software UART problem.
PostPosted: Thu Apr 10, 2008 9:30 am     Reply with quote
Software UART problem.

What can be the problem in this.

The TX is coming from a MAX232 and is working on the same chip with the Hardware uart.


Code:
#include <18F2455.h>

#FUSES NOXINST
#FUSES NOWDT
#FUSES INTHS             
#FUSES NOBROWNOUT
#FUSES PUT                     
#FUSES MCLR                   
#FUSES NOLVP

#use delay(CLOCK=4000000)
#use rs232(BAUD=19200,PARITY=N,XMIT=PIN_C6,RCV=PIN_C7,BITS=8,TIMEOUT=10,STREAM=com1,ERRORS)
#use rs232(BAUD=19200,PARITY=N,RCV=PIN_B1,BITS=8,TIMEOUT=10,STREAM=com2,ERRORS)


void Chk_com2(void){
 char c;
 if (kbhit(com2)){
  c=fgetc(com2);
  fputc(c,com1);
  fprintf(com1,"_%x_",c);
 }
}

//**Ext1 int**//
#INT_EXT1 //pin 22 int
void Ext_int1(void){
 Chk_com2();
}

void main(){
 
 ext_int_edge(1,H_TO_L);
 enable_interrupts(INT_EXT1);
 enable_interrupts(GLOBAL);
 
 
 while(1)
}
Matro
Guest
PostPosted: Thu Apr 10, 2008 10:42 am     Reply with quote
Try this
Code:

#use rs232(BAUD=19200,PARITY=N,RCV=PIN_B1,BITS=8,TIMEOUT=10,STREAM=com2,FORCE_SW,ERRORS)


Matro
Guest
PostPosted: Thu Apr 10, 2008 11:39 am     Reply with quote
The funny thing is, if I make a endless loop in main it's working.

Code:
void main{
while (1) {
 char c;
 c=fgetc(com2);
 fputc(c,com1);
 fprintf(com1,"_%x_",c);
}


I think the problem can be the handling of Ext1 int?

Any sugest...

F
Guest
PostPosted: Thu Apr 10, 2008 12:05 pm     Reply with quote
Solution in RS232 is the sw : SAMPLE_EARLY

Thanks
F
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