1. Use 4 LEDs as the group1 and the other 4 LEDs as the group2. Make sure each L

Question

1. Use 4 LEDs as the group1 and the other 4 LEDs as the group2. Make sure each LED interface to one pin on Arduino board (ATMEGA 328P). Use 2 switches to control LEDs. When switch1 is pressed, 4 LEDs in group1 will blink simultaneously 3 times. When switch2 is pressed, the 4 LEDs in group2 will blink simultaneously 3 times. You can use either assembly LANGUAGE or AVR Cprogramming

2. Connect 4 LEDs to port b and one switch to port d. When the switch is pressed show the knight rider. The time interval between each stage is around 2 seconds. You can use either assembly LANGUAGE or AVR Cprogramming.

Explanation / Answer

1)

org 00H
;MAIN PROGRAM

toggle: MOV P1, #01H   ;move 00000001 to PORT1
   CALL delay   ;execute delay
   MOV A,P1   ;move PORT1 value to accumulator
   CPL A       ;complement PORT1 value
   MOV P1, A   ;move 1111110 to PORT1
   CALL delay   ;execeute delay

   sjmp toggle

;DELAY SUB-ROUTINE

delay:    MOV R5, #10   ;load register R5 with 10
third:    MOV R6, #200   ;load register R6 with 200
second: MOV R4, #200   ;load register R4 with 200

   DJNZ R4, $   ;decrement R4 till it is 0
   DJNZ R6, second   ;decrement R6 till it is 0
   DJNZ R5, third   ;decrement R5 till it is 0

   ret       ;return to main program
END

2)

led1   bit P 2.0
ORG 0000h

loop:

clr led1

//TURN ON THE LED

call delay

setb led1

//TURN OFF THE LED
call delay

ajmp loop

delay:

mov r6,#201

l0_delay:

mov r7,#216

l1_delay:

mov r4,#10

djnz r4,$

djnz r5,l3_delay

djnz r6,l2_delay

ret

end

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