;------------------------------------------------------------------------
; 4-digit up/down counter
; for PIC16F88
; http://picprojects.org.uk
; 30-04-2009 
; counter2009.asm
;
; I wrote this for a bit of fun. If you find it useful
; that's great, if it doesn't do what you want, well
; it didn't cost you anything did it :-)
;
; Students:  
; This code isn't commented, good luck to you working out
; how it functions.  If you can pass it off as your own work
; you deserve what you get.
;
; Please don't ask me for help modifying it to do what you
; want rather than what it does because it is what it is.
;
; Notes:
; ----------------------------------------------------
; Fixed issue with reset button not working unless
; preset setup executed
;
; Added function to save preset counter value to EEPROM
; and restore it when after a power cycle
;

	#include "p16f88.inc"
	
;Program Configuration Register 1
		__CONFIG    _CONFIG1, _CP_OFF & _CCP1_RB0 & _DEBUG_OFF & _WRT_PROTECT_OFF & _CPD_OFF & _LVP_OFF & _BODEN_ON & _MCLR_ON & _PWRTE_ON & _WDT_OFF & _INTRC_IO

;Program Configuration Register 2
		__CONFIG    _CONFIG2, _IESO_OFF & _FCMEN_OFF

;###########################################################################

	org	0x2100
	de	0xFF	; mode 

	org	0x2101
	de 0,0,0,0		; counter preset
	
	org	0x2108
	de "counter2009.asm"

;###########################################################################

          errorlevel -302     ; suppress banksel warning messages
          errorlevel -311     ; suppress HIGH operator warning messages

	cblock 0x20
	debounce
	Unit
	Tens
	Hund
	Thou
	unit7seg
	tens7seg
	hund7seg
	thou7seg
	indLED
	mplxrot
	keyNow
	keyLast
	keyEdge
	loadUnit
	loadTens
	loadHund
	loadThou
	state

	endc

	cblock 0x70
	Wisr
	Sisr
	flags

	endc

#define   bank0     bcf       STATUS,RP0          ; Sel Bank 0
#define   bank1     bsf       STATUS,RP0          ; Sel Bank 1

; indicator LEDs 
overflow	equ 0
hold	equ 1
up	equ 2
down	equ 3


; flag bits
invert	equ 0
suppressZeros	equ 1
resetNext	equ 2
keysReady	equ 3
intEdge	equ 4

#define	digitDrive 	PORTA
#define	segmentDrive	PORTB
#define	overflowPulse	PORTA,7
#define	switchIn	PORTA,6
#define	countIn	PORTB,0




	org 0x000
	nop
	clrf	PCLATH
	goto	_main
	
	org 0x004

	#include counter_functions.inc
	#include counter_eeprom.inc
	#include counter_main.inc


	end