Hi,

you should carefully check the generated code. I think CCS uses only the
built-in hardware serial port if some conditions met. Such one is of
course, for example, that the pins are assigned to xmit and receive which
are capable of doing it. However, AFAIK, the INVERT clause violates also
this assumption. On the other hand, only the hardware receiver supports
INT_RDA. Such way, you have now a receiver routine I guess, which does its
job with bit banging method, and you have an INT_RDA routine which won't
be activated.

Regards,
Imre



On Sat, 5 Jan 2002, Kevin A. Benedict wrote:

> Hi everyone,
> I am trying to getc() a character from the PC serial port and
> send it back to the serial port with #INT_RDA interrupt.
> If I run the program without the interrupt, it works fine.
> Basically a c=getc() followed by a putc(c);
> However when I use the #INT_RDA nothing happens ???
> I am using CCS PCM C Compiler, Version 2.717, 9410
> Is their any know bugs for the F628 with this compiler ?
> I checked CCS website and did not see anything.
> Any help would be appreciated,
> Kevin
>
> #device PIC16F628
> #case
> #include "C:\PROJECTS\16f628.h"
> #fuses xt,nowdt,noprotect,put,nobrownout,nolvp
> #use delay (clock=4000000)
> #use rs232 (baud=300, rcv=PIN_B1, xmit=PIN_B2, parity=N, bits=8,ERRORS, INVERT)
>
> #ZERO_RAM
>
> #INT_RDA
> void serial_isr(){
>         char c;
>         c=getc();
>         putc(c);
>                  }
>
> main ()
> {
>    enable_interrupts(GLOBAL);
>    enable_interrupts(INT_RDA);
>
>         puts("\r\n Starting Test ...\r\n");
>         while(1);
> }
>
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