Accessing Long Tables

[Suraj143]

Is there any method to use a table above 256 lines?

Let say I have a pointer called Point_H & Point_L .I want to point to my table using those.My table is 512 lines or more longer.

 

[Nigel Goodwin]

Check the many previous posts here about it, or consult my tutorials - the 8x8 LED matrix one uses two long tables (one for the font, and one for the text string).

 

[Suraj143]

Hi Nigel thanks for your reply.I went through your codes that's what I was finding.

ASCII_Table  	movlw	High(Table)	;perform read from long table
		addwf	offsetH, W
		movwf	PCLATH
		movlw	Low(Table)
		addwf	offsetL, w
		btfsc   STATUS    , C
		incf	PCLATH, f
		MOVWF   PCL

Table		retlw	00h		; Page 0x05
		retlw	.1
		----
		----
		----
		----
		----
		----
		----			; Page 0x06
		----
		----
		----

I have a question.

Can I call the above subroutine in anywhere in PIC memory below 2K?

Ex;I'm calling the above subroutine from page 1.But the above subroutine in page5.Also half of the contents of the lengthy table is in another page (page6).

 

[Nigel Goodwin]

I would suggest if you're calling it from a different 2K block that you use the 'longcall' macro to do so.

 

[Suraj143]

No no I want to call a lengthy table from the above code.My code is less than 2K boundary.

What I mean was the lengthy table values can cross page boundaries ex:0x05,0x06 etc...In this case will there be a problem?

 

[Nigel Goodwin]

No no I want to call a lengthy table from the above code.My code is less than 2K boundary.

What I mean was the lengthy table values can cross page boundaries ex:0x05,0x06 etc...In this case will there be a problem?

It can cross boundaries no problem, that's the point of it - even mulitple boundaries.