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start:
init:
clrf PORTA ; make sure port A output latches are
; low
clrf PORTB
bsf STATUS, RP0 ; select memory bank 1
movlw b'11111111' ; set port A data direction to inputs
movwf TRISA
movlw b'00000000' ; set port B data direction to outputs
movwf TRISB
bcf STATUS,RP0 ; select memory bank 0
rawtemp EQU B6
countdown EQU B7
goto main
beep: ; a for loop that beeps a buzzer and
; turns on a led then sets a led on if
; nothing is done
movlw 5
movwf countdown
loop1:
bcf PORTB, 3 ; turn off the status
bsf PORTB, 0 ; put a RED LED on PORTB:0
bsf PORTB, 1 ; put a BUZZER on PORTB:1
call wait1000ms
clrf PORTB
call wait1000ms
decfsz countdown, F ; the main part of the loop
goto loop1
bsf PORTB, 2 ; put an AMBER LED on PORTB:2
return
main: ; reads the temprature
bsf PORTB,3 ; put a GREEN LED for status on PORTB:3
call readadc1 ; put a THERMISTOR on PORTA:1
movf B1, W
movwf rawtemp
call readadc0 ; put a POT on PORTA:0
movf B0, W
subwf rawtemp, w ; subtract the from the threshold value
btfss STATUS, 0 ; if higher than desired temp
call beep
clrf STATUS ; clears the status flag, which might have a carry bit set
goto main
END ; ends the program
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