2 Interrupt for 2 ch rs232 not work

[trirath]

#include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,BORV46,CPUDIV1,VREGEN
#use delay(clock=48000000)
#use rs232(baud=38400 ,xmit=PIN_C6, rcv=PIN_C7,STREAM=MONITOR)
#use rs232(baud=38400,xmit=PIN_B1, rcv=PIN_B0,STREAM=Client)
#include <stdlib.h>
#include <input.c>
#include <string.h>

#define BUFFER_SIZE_MON 32
//------client Side -----------------
int8 buffer[32];
int8 wr_index=0;
int1 msg_ready=0;
char BUFFER_SIZE;
//---------------------------------
//------MONITOR SIDE---------------
int8 buffer_mon[BUFFER_SIZE_MON+1];
int8 wr_index_mon=0;
int1 msg_ready_mon=0;
//---------------------------------

#int_rda
void serial_mon_isr() {
int8 ch_mon;
ch_mon=getc();
if(ch_mon!='\r' && wr_index_mon < BUFFER_SIZE_MON )
buffer_mon[wr_index_mon++]= ch_mon;

else {
buffer_mon[wr_index_mon++]= '\0';
msg_ready_mon=1;
}
}

#int_ext
void serial_isr() {
int8 ch;
ch=getc();
if(wr_index== BUFFER_SIZE)
{
buffer[wr_index++]=ch;
buffer[wr_index++]='\0';
msg_ready=1 ;}

else buffer[wr_index++]=ch;


}

void main(void){
enable_interrupts(INT_EXT_H2L);
enable_interrupts(int_rda);
enable_interrupts(global);

while(true){

if(msg_ready_mon){
disable_interrupts(int_rda);
fprintf(Client,"%s\r\n>>",buffer_mon);
wr_index_mon=0;
msg_ready_mon=0;
enable_interrupts(int_rda);

}

if(msg_ready){
disable_interrupts(INT_EXT_H2L);
fprintf(MONITOR,"%s\r\n>>",buffer_mon);
wr_index=0;
msg_ready=0;
enable_interrupts(INT_EXT_H2L);

}

}


}


i tried each interrupt it work only 1 intterupt(RDA or EXTB0)
but not work when used both interrupts as above .

[trirath]

[mkuang]

In your #int_ext routine you are detecting a H_L transition via external interrupt. THe first time that occurs is the start bit. Then you have to manually shift in the remaining bits. You don't have a character until you do all that. So your interrupt handling is incorrect for this case.

[Ttelmah]

The software serial routine handles shifting in the byte.

The first problem is that the correct routines are not being used. The INT_RDA, needs to use fgetc(MONITOR), and the int_ext, fgetc(Client).
As it stands, the code will hang, since the second RS232 will be called by default on a getc. When int_rda triggers it goes to the wrong getc, never clears the character, leaving the interrupt permanently triggering....

38400bps, is only 312 instructions/bit. Now, if the code is in the first interrupt routine, when the falling edge arrives on INT_EXT, it could take as much as perhaps 150 instruction times to get 'out' again (time to save the registers, and enter the routine, if it has _just_ been called, time to get the character, and store it, time to restore the registers and exit). The second routine then gets called (another perhaps 40 instructions to reach the 'getc', meaning that 190 instruction times have now counted by. The getc, will wait for 156 instruction times (half a bit), before sampling the data, so the character will be missed. Change the #use RS232 for the software stream, to:

[trirath]

Why this case is work for only 1 with int ext?

[trirath]

[trirath]

[Ttelmah]

Comments:
You still have not added 'sample_early' to the software RS232 definition. You need it.
You have a huge problem with the printout. The printout takes something like 22 character times, and during the whole of this, you have the interrupt disabled. You cannot use a software RS232, as 'full duplex'. While you are sending, data will be lost. If interrupts are left 'on' character timings on the output will be destroyed. If left off, incoming characters will be missed.

Best Wishes

[trirath]

If add 'sample_early' like this

[trirath]

hi Ttelmah and all

I found that code is working very well when use for PIC16F873A.