****************************************************************************
*
* instrument.a - acquires all needed data values from various instruments
*
*

	SECTION bss
speed	rmb		2
mileage	rmb		4
engtemp	rmb		2
fuelamt	rmb		2
	ENDSECT
		
	SECTION code

* initialize hardware
*
* Entry: None
*
* Exit:  D = speed value in miles per hour
insinit:
		ldd		#55
		std		speed,u

		ldd		#(171556/65536)
		std		mileage,u
		ldd		#40439
		std		mileage+2,u

		ldd		#200
		std		engtemp,u
		
		ldd		#9
		std		fuelamt,u
		
		rts

* Get the current speed
*
* Entry: None
*
* Exit:  D = speed value in miles per hour
getspeed:
		ldd		speed,u			55 mph
		rts

speedplus:
		ldd		speed,u
		addd	#$0001
		std		speed,u
		rts

* Get the odometer value
*
* Entry: None
*
* Exit:  D = bits 23-16 of odometer
*        X = bits 15-0  of odometer
getmileage:
		ldd		mileage,u
		ldx		mileage+2,u
		rts

		
* Get the current engine temperature
*
* Entry: None
*
* Exit:  D = engine temperature value in Farenheit
getengtemp:
		ldd		engtemp,u
		rts

		
* Get the current fuel amount
*
* Entry: None
*
* Exit:  D = fuel amount in 16ths
getfuel:
		ldd		fuelamt,u
		rts

		
	ENDSECT