Hi all,

Tinkering with C18 (finally!).  FYI I'm still new to C with micros.

Confused why this is happening...

I've setup a quick timer-0 interrupt to multiplex some characters on =20
an LED display, but the values I'm assigning the characters to (in the =20
main code) are not being set.  The disassembly listing shows that the =20
4 code lines starting with "muxcol =3D 2" are being ignored.

(Partial) code...

....
#pragma data
unsigned char CharPattern0, CharPattern1=3D0b01011011, CharPattern2;
unsigned char muxcol=3D0;
....
#pragma code
void main (void)
{
	OSCCON =3D 0b01110111;		// 16Mhz
	TRISA =3D 0b00010011;			// AN0 is analog input, RA4 is switch input.
	TRISB =3D 0;
	TRISC =3D 0;

	// TODO -- testing...
	PORTB =3D 0b01010101;
	PORTC =3D 0b01010101;

	muxcol =3D 2;

	// TODO -- testing...
	CharPattern0 =3D 0b00000110;
	CharPattern1 =3D 0b01011011;
	CharPattern2 =3D 0b01001111;

	RCONbits.IPEN =3D 0;            //disable priority levels
	T0CON =3D 0b11000100;
	INTCONbits.TMR0IE =3D 1;
	INTCONbits.GIE =3D 1;

	while (1)
		;
}




(Partial) disassembly listing...
....
51:                	PORTC =3D 0b01010101;
   002C    6E82     MOVWF 0xf82, ACCESS
52:
53:                	muxcol =3D 2;
54:
55:                	// TODO -- testing...
56:                	CharPattern0 =3D 0b00000110;
57:                	CharPattern1 =3D 0b01011011;
58:                	CharPattern2 =3D 0b01001111;
59:
60:                	RCONbits.IPEN =3D 0;            //disable priority leve=
ls
   002E    9ED0     BCF 0xfd0, 0x7, ACCESS
61:                    T0CON =3D 0b11000100;
   0030    0EC4     MOVLW 0xc4
   0032    6ED5     MOVWF 0xfd5, ACCESS
62:                    INTCONbits.TMR0IE =3D 1;
   0034    8AF2     BSF 0xff2, 0x5, ACCESS
....


Any clue why this is happening?

Thanks,
-Neil.



--=20
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