I need help setting up my program to poll the inputs and give the proper output according to the logic diagram below. I've already established the initialization vectors and the first part of it. Here's the code I have so far.
list p=16f628 ; list directive to define processor
#include <p16f628.inc> ; processor specific variable definitions
; errorlevel -302 ;hide banking message
;*****
__CONFIG _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _INTRC_OSC_NOCLKOUT & _MCLRE_ON & _LVP_OFF
;*****
;; __CONFIG _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _INTRC_OSC_CLKOUT & _MCLRE_ON & _LVP_OFF
;*****
;internal osc settings - choice of two
;*****
; '__CONFIG' directive is used to embed configuration data within .asm file.
; The lables following the directive are located in the respective .inc file.
; See respective data sheet for additional information on configuration word.
;***** VARIABLE DEFINITIONS
w_temp EQU 0x70 ; variable used for context saving
status_temp EQU 0x71 ; variable used for context saving
;*****
;**********************************************************************
ORG 0x000 ; processor reset vector
goto main ; go to beginning of program
;*****
ORG 0x004 ; interrupt vector location
movwf w_temp ; save off current W register contents
movf STATUS,w ; move status register into W register
movwf status_temp ; save off contents of STATUS register
; isr code can go here or be located as a call subroutine elsewhere
movf status_temp,w ; retrieve copy of STATUS register
movwf STATUS ; restore pre-isr STATUS register contents
swapf w_temp,f
swapf w_temp,w ; restore pre-isr W register contents
retfie ; return from interrupt
;*****
main
; remaining code goes here
clrf PORTA
clrf PORTB
MOVLW B'00000111'
MOVWF CMCON ; Turn off comparator
bsf STATUS,RP0 ; bank one
movlw 0xFF
movwf TRISA ; porta all Input
movlw 0x00
movwf TRISB ; portb all Output
bcf STATUS,RP0 ; return to bank 0
;*****
movlw b'00000000' ;See datasheet for prefered
movwf OPTION_REG ;settings of OPTION_REG
;*****
bsf PORTB,7 ; Turn on Power LED
;*****
; here is where my polling is gonna go for system operations.
goto main
;*****
END
Here is the logic diagram of my circuit
(Operation)
Upper (RA0) + Lower Sensor (RA1) = 1 Then Operation (RB6) = 1; Warn (RB5) = 0; Refill (RB3, RB4) = 0
Upper Sensor = 0 + Lower Sensor = 1 Then Operation = 1; Warn = 1; Refill = 0
(Refilling)
Upper + Lower Sensor = 0 Then Operation = 0; Warn = Flashing; Refill = 1
If Upper Sensor = 0 Then Operation = 0, Warn = Flashing, Refill = 1
If Upper Sensor = 1 Then Operation = 1; Warn = 0; Refill = 0
(End Refilling)
