; The objective of this program is to display a static message over a 8X4 LED matrix
; PORTC will increment each colum incredibly fast while port b will handle the rows in the matrix
; Initialy this program will be static
#include <p16F690.inc>
     __config (_INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _BOR_OFF & _IESO_OFF & _FCMEN_OFF)
org 0 
COUNT equ 0x20    
DISPLAY equ 0x21
PORTS:
	bsf       STATUS,RP0          ; select Register Page 1
    movlw     0x00                 ; Move the hex value of 0 to multi purpose register W
    movwf     TRISC               ; make IO PortC all output
	movlw     0x00
	movwf     TRISB
	bcf       STATUS,RP0
	movlw     0x01
    movwf     DISPLAY
	clrf      COUNT
MAIN:
	movf      COUNT,0
	call      TABLE
	movwf     PORTB
	call      ROTATE
	movfw      DISPLAY
	movwf     PORTC
	incf      COUNT,1
	movlw     0x08
	subwf     COUNT,0
	btfsc     STATUS,2
	clrf      COUNT  
	goto      MAIN   
ROTATE:
	rlf       DISPLAY,f ; Rotate left
	btfss     STATUS,0 ; Check the carry bit
	return 
	clrf      PORTC
	return
TABLE:
	addwf PCL
	retlw b'1000'
	retlw b'0100'
	retlw b'0010'
	retlw b'0001'
	retlw b'0010'
	retlw b'0100'
	retlw b'1000'
	retlw b'0100'
	return
end