Controlling the traffic lights on the intersection of N Dixie Ave. and E 1st St.

Question

Controlling the traffic lights on the intersection of N Dixie Ave. and E 1st St. [25 Marks] For each direction of these two streets, three lights (green, yellow, and red) are used to control the traffic. Assume that the RGB-LED on the DragonBoard is used to represent the traffic lights on N Dixie Ave., while the LEDs connected to pins 0, 1, and 2 of PORTB are used to represent the green, yellow, and red light on E 1st St., respectively. Based on traffic occurrence, we need to be able to change the duration of the green phases on the intersection. Therefore, your program should read a binary value 'n' from the DIP-switches connected to PTH0~2, and use n as a multiplier for the delays of the green phases, if n is 0, consider it as n 1. Write an assembly program to control the traffic lights on this intersection based on the aforementioned description. Your program should have 6 states and each state should have a different delay as shown in the table. State N Dixie Ave E 1st St. Delay [sec.] 1 Green (RGB green Red (PB2) 2 Yellow (RGB blue) 4 3n Red (RGB red) Red Red Red Red Red Green (PB0) Yellow (PB1) Red 3n The following figure shows an example of the first state in the table where the two directions of N Dixie Ave. are GREEN while the two directions of E 1st St. are RED

Explanation / Answer

Please find the below assembly language written in 8086 microprocessor

#start=Traffic.exe#

name "traffic"

mov ax,all_read

out 4,ax

move si,offset situation

next:

mov ax,[si]

out 4,ax

;wait for 5 seconds

mov cx,4Ch

mov dx,4B40h

mov ah,86h

int 15h

add si,2; next situation

cmp si,sit_end

jb next

mov si,offset situation

jmp next

; FEDC-BA98-7654-3210

situation dw 0000_0011_0000_1100b

s1 dw 0000-0110-1001-1010b

s2 dw 0000-1000-0110-0001b

s3 dw 0000-1000-0110-0001b

s4 dw 0000-0100-0100-1001b

sit_end=$

all_red equ 0000_0010_0100_1001b

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