;#define eprom		;*** For prototype only  - comment out for production 	***
#define clock_trim 0x70	;*** clock trim for EPROM chip tailor to suit		***
			;*** NOTE: READ THIS VALUE VBEFORE ERASING THE CHIP!!	***


;*********************************************************************
;**    pic12c509 based radio control failsafe detector              **
;**    (c) copyright 1998 A.D. Kerr all rights reserved             **
;*********************************************************************
 
         list   p=12c508

#include "p12c508.inc"


        __config 0x1A   ;0000 1110 mclr enabled, cp off, wdt dis, osc intrc




;------------------------- equates -------------------------
;*****			Constants			*****
duration	equ	.10	;beep duration in chirps
chirp_length	equ	.15	;no of periods in a chirp
hwc_period 	equ	.25	;output wave cycle period {(n)x20us}
outer_time	equ	.100	;timeout count
inner_time	equ	.255	;adjust for 1ms
options		equ	0x8F	;10001111

;*****			Registers			*****

flags		equ	0x10	;flag register, see below for details
duration_timer	equ	0x11	;beep duration timer
half_cycle_timer	equ	0x12	;half wave period timer
chirp_timer	equ	0x13	;10ms chirp wave counter
outimer		equ	0x14	;outer loop timer
intimer		equ	0x15	;inner loop timer
half_cycle	equ	0x16	;wave period variable


;**********	bits within registers	**********

;***   flag register pointers - use with bsf, bcf, btfsc and btfss	***
pflag1	equ	0x00	;port 1 flag - indicates that port 1 has gone HI


;*****                     i/o register                     *****
;----------------------------------------------------------------
;12c509 pin assignments:	pin 2	ch1 in	gp5
;				pin 3	N/A	gp4
;				pin 4	N/A	gp3
;				pin 5	N/A	gp2
;				pin 6	output2	gp1
;				pin 7	output1	gp0				
;----------------------------------------------------------------

ch1		equ	0x05	; pin 2, gp5, input
output1		equ	0x04	; pin 7, gp0, output
output2		equ	0x01	; pin 6, gp1, output
iostat		equ	0x2C	; 0011 1100 i/o direction bits 1=input



;**********************************************************************
;* reset routine						      *
;**********************************************************************

reset org 0x000

	movwf	0x05		;set oscillator trim
	nop
	goto 	start		;put code above 0x40 to hide it

start org 0x040
	
	movlw	0x00		;clear GPIO first of all
	movwf	GPIO
	movlw	iostat		;setup GPIO pins	
	tris	GPIO	
	clrwdt			;clear WDT ...
	clrf	TMR0		;and timer0 just in case
	movlw	options		;everything disabled!
	option			;set options
	clrf	flags		;clear flag register
	goto oops		;beep once at startup


;****************************************************************
;*		MAIN ROUTINES START HERE			*
;****************************************************************


;****************************************************************
;*	Does the patient have a pulse, doctor?  Clear the WDT,	*
;*	then wait for an input pulse				*
;****************************************************************

checkpulse
	bcf	flags, pflag1	;clear port 1 flag for use
	movlw	outer_time	;
	movwf	outimer		;clear outer loop timer
	movlw	inner_time	;
	movwf	intimer		;clear inner loop timer

checkport1

	btfss	GPIO, ch1	;channel 1 high?
	goto 	portlow		;no, continue
	bsf	flags, pflag1	;yes, set port 1 flag
	decfsz	intimer, 1	;decrement inner loop timer
	goto 	checkport1	;inner loop still running, continue
	movlw	inner_time	;inner loop expired, reset
	movwf	intimer		;reset inner timer
	decfsz	outimer, 1	;decrement outer loop timer
	goto 	checkport1	;outer loop still running, continue
	goto	oops		;both timers have expired, oops!
	
portlow				;Channel 1 is LOW
	decfsz	intimer, 1	;decrement inner loop timer
	goto	checkflag	;inner loop timer still running, check flag
	movlw	inner_time	;inner loop expired, reset to &FF
	movwf	intimer		;reset inner timer
	decfsz	outimer, 1	;decrement outer loop timer
	goto 	checkflag	;outer timer still running, check flag
	goto	oops		;both timers have expired, OOPS!
 
checkflag			;channel 1 is low, check if it has been high
	btfss	flags, pflag1	;was channel1 high?
	goto 	checkport1	;no, keep looking

portdetect			;pulse detected on channel 1
	bcf	flags, pflag1	;Clear port 1 flag
	movlw	outer_time	
	movwf	outimer		;reset outer timer
	movlw	inner_time	
	movwf	intimer		;reset inner timer
	goto checkport1		;look for the next pulse

;************************************************************************
;*									*
;*	Output sound routine.  This routine is called every time the 	*
;*	WDT goes off.							*
;*									*
;*	Variables used -						*
;*									*
;*	duration_timer	 - Remaining chirps in this beep		*
;*	chirp_timer	 - Remaining cycles in the current chirp	*
;*	half_cycle_timer - Remaining 10us delays in the current half cycle*
;*									*
;*	Constants used -						*
;*									*
;*	duration	- Sets the duration of the beep in chirps	*
;*	chirp_length	- Sets the length of a chirp in cycles		*
;*	hwc_period	- Sets the duration of an output half cycle	*
;************************************************************************
 
oops				;WDT went off - no I/P signal!
	movlw	duration	;get the beep duration - 1/2 second or so?
	movwf	duration_timer	;put it in the duration timer
	movlw	hwc_period	;
	movwf	half_cycle	;initialise O/P frequency variable 
beep	
	movlw	chirp_length	;get no cycles/chirp
	movwf	chirp_timer	;put in chirp cycle counter

cycle
;***	first half cycle	***

	movf	half_cycle,0	;get the ouput half wave cycle period
	movwf	half_cycle_timer	;put it in half wave cycle timer
	bsf	GPIO, output1	;set output1 high
	bcf	GPIO, output2	;set output2 low
	
half_cycle_1		;delays <hwc_period> x 10us			
	nop
	nop
	nop
	nop
	nop
	nop
	nop
        decfsz	half_cycle_timer, 1
	goto 	half_cycle_1

;***	now do the second half cycle	***
	
	movf	half_cycle, 0	;get the ouput half wave cycle period
	movwf	half_cycle_timer	;put it in hwc timer
	bcf	GPIO, output1	;set output1 low again
	bsf	GPIO, output2	;and output2 high
	
half_cycle_2		;delays <timer1> x 10us			
	nop
	nop
	nop
	nop
	nop
	nop
	nop
        decfsz  half_cycle_timer, 1
	goto 	half_cycle_2
	
	decfsz	chirp_timer,1	;done all cycles?
	goto	cycle		;no, do another cycle
tp1
	decfsz	duration_timer,1	;beep finished?
	goto	change_tone
	goto	finish

change_tone
	;decf	half_cycle, 1	;decrease cycle period
	nop	
	goto 	beep		;no, go do another chirp
	
;***	Beep finished, turn O/P's off
finish
	bcf	GPIO, output1	;set both output pins low
	bcf	GPIO, output2
	goto	checkpulse	;O.K, go check input



;* the bit below is for use with the EPROM development chip

 ifdef eprom

	org 0x3ff
	movlw	clock_trim

 endif
	
	end

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