Tamas Rudnai wrote:
> High level would be something like:
>
> def PORTB.0 as digital out;
> def LED1 as PORTB.0;
>
> LED1.on;
> wait(100);
> LED1.off;
>
> ...
>
> Is there any language something like this for PIC, which still can
> produce a fairly compact code?

Yes, although actually a bit higher level since your two I/O pin declaration
lines are accomplished in a single line:

/outbit  led1    portb 0 n   ;low turns on LED 1

         set_led1_on         ;turn on LED 1
         ...
         set_led1_off        ;turn off LED 1

The /OUTBIT declaration gives the name LED1 to port B bit 0, and defines a
bunch of MPASM macros and string substitutions accordingly.  The "n" in the
declaration indicates negative logic, meaning the "ON" case is logic low and
"OFF" is logic high (LED connected with series resistor to Vdd for example).
SET_LED1_ON and SET_LED1_OFF are MPASM macros defined in the expansion of
/OUTBIT.  These set the bank as appropriate (using my DBANKIF macro, of
course) and then set the pin high or low according to the desired on or off
state.  On PICs with LAT registers, SET_LED1_ON and SET_LED1_OFF will write
to LAT instead of PORT.

For example, on a PIC 18 SET_LED1_ON will always expand to the single
instruction BCF LATB,0 because port B is always in the access bank.

/OUTBIT is just one of many cool things in my PIC assembler preprocessor,
PREPIC, which is part of my PIC development environment described at
http://www.embedinc.com/pic.


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