VGAwith9block.txt

timer_isr:
//RAM allocation,no need to initialise the RAM
//00-store the information whether this is the first time to fresh the frame buffer
//01-current pixel address x
//02-current pixel address y
//03-which part call the judge function
//04-color
//05-IR command
//06-Mouse status
//07-Mouse right click state
//08,09,0A,0B-four colours
//0C-mouse select counter

BEGIN:
	load a 00			//check whether it’s the first time
	load_val b 01
	BREQ MOUSE_CLEAR 		//if not the first time, do the counter

//LOOP to RETURN is the region judge, no matter the region construction
//or to judge the color of the mouse position should use this function or loop

LOOP:
	load a 01		
	store B0 a
	load a 02	//y’s range
	store B1 a
	load_val b 28	
	BLTQ REGION1
	load_val b 50
	BLTQ REGION2
	GOTO REGION3

REGION1:		// x’s range
	load a 01
	load_val b 36
	BLTQ BLOCK1
	load_val b 6C
	BLTQ BLOCK2
	GOTO BLOCK3

REGION2:
	load a 01
	load_val b 36
	BLTQ BLOCK4
	load_val b 6C
	BLTQ BLOCK5
	GOTO BLOCK6

REGION3:
	load a 01
	load_val b 36
	BLTQ BLOCK7
	load_val b 6C
	BLTQ BLOCK8
	GOTO BLOCK9

BLOCK1:
	load_val a 01		//command of the car
	GOTO RETURN0
BLOCK2:
	load_val a 02		//command of the car
	GOTO RETURN1
BLOCK3:
	load_val a 03		//command of the car
	GOTO RETURN0
BLOCK4:
	load_val a 04		//command of the car
	GOTO RETURN1
BLOCK5:
	load_val a 05		//command of the car
	GOTO RETURN0
BLOCK6:
	load_val a 06		//command of the car
	GOTO RETURN1
BLOCK7:
	load_val a 07		//command of the car
	GOTO RETURN0
BLOCK8:
	load_val a 08		//command of the car
	GOTO RETURN1
BLOCK9:
	load_val a 09		//command of the car
	GOTO RETURN0

RETURN0:
	store 05 a			//store what came from the car

	load_val a 00
	load b 03		//0F to store who call this function
	add a b			
	store B2 a
	load_val a 00
	BREQ CREATNEXT
	load_val a 01
	BREQ CARCONTROL
	GOTO MOUSE_SET
	
RETURN1:
	store 05 a			//store what came from the car

	load_val a 01
	load b 03
	add a b
	store B2 a
	load_val a 00
	BREQ CREATNEXT
	load_val a 01
	BREQ CARCONTROL
	GOTO MOUSE_SET

//CREATNEXT is with 2 counters that counts from 0 to 160 and 0 to 120 respectively
CREATNEXT:
	load a 01
	load_val b 9F
	BREQ ADDY
	incr a a
	store 01 a
	GOTO LOOP

ADDY:
	load a 02
	load_val b 77
	BREQ FINISH
	incr a a
	store 02 a
	load_val a 00
	store 01 a
	GOTO LOOP
	
FINISH:
	load_val a 01
	store 00 a

MOUSE_ISR:

MOUSE_CLEAR:	
	//first to clear the last position of mouse 
	load_val a 02 	//02 means in check region,it should clear the former position
	store 03 a   
	GOTO LOOP 	 

MOUSE_SET:	//then set the current mouse address to foreground
	load a A0		//mouse click information
	store 06 a
	load_val b 02
	and a b
	load b 07
	store 07 a
	BLTQ NOCLICK
	BREQ NOCLICK		//if clicked, generate a new color
	
	load_val a 00	//00 car
	GOTO NOCLICK
	
	
//car counter in here
	load a 0C
	load_val b 04
	BREQ SELECT_ZERO_CAR
	incr a a
	GOTO NOCLICK
SELECT_ZERO_CAR:	//also clears colour
	load_val a 00
	
	
	store 0C a		//select car in here directly
	load_val b 08
	add a b
	deref a
	store B3 a
NOCLICK:	
			//just show the position
	load a A1   	//mouse X address	
	store 01 a
	load a A2    	//mouse Y address		
	store 02 a		
	load_val a 01	   //01 means in loop, it should set the specific position
	store 03 a
	GOTO LOOP
CARCONTROL:
	load a 06	//before everything starts, check if mouse is left clicked
	load_val b 01
	and a b
	BREQ SKIP_LEFT_CLICK_RESET
	load_val a 05	//reset IR command
	store 05 a
SKIP_LEFT_CLICK_RESET:
	load a 05		//05 to store the command of car
	store C0 a		//send to IR
	store 90 a
	load a 0C
	store 91 a
	GOTO_IDLE