//  opt01.c

//  efficient linear memory access

/*  Copyright (C) 2016 H.Poetzl
**	
**  This program is free software: you can redistribute it and/or
**  modify it under the terms of the GNU General Public License
**  as published by the Free Software Foundation, either version
**  2 of the License, or (at your option) any later version.
*/

//  sdcc -mpic14 -p16f1718 --use-non-free -Wl-C opt01.c


extern __at(0x010C) __sfr LATA;
extern __at(0x010D) __sfr LATB;
extern __at(0x010E) __sfr LATC;

static volatile __data unsigned char * const cptr = 
	(volatile __data unsigned char *)0x2000;

static volatile __data unsigned char * ptr = 
	(volatile __data unsigned char *)0x2000;

static unsigned char idx = 255;

// --------------------------------------------------
// main

void main()
{
    while (idx) {
	LATA = cptr[idx];

	LATB = ptr[idx];

	__asm
	;   inline asm version
	    BANKSEL _idx
	    MOVF    _idx,W
	    MOVWF   FSR0L
	    MOVLW   high(0x2000)
	    MOVWF   FSR0H
	    MOVF    INDF0,W

	    BANKSEL LATC
	    MOVWF   LATC
	__endasm;
    }
}