*****HAVE TO USE ASSEMBLY LANGUAGE (keil Uvision5)****** Step 1 – Blinking LED W

Question

   *****HAVE TO USE ASSEMBLY LANGUAGE (keil Uvision5)******
Step 1 – Blinking LED
Write a program that continuously blinks the blue LED ON and OFF with a frequency of 2 seconds – ON for one second and OFF for one second. Implement this with a main program and three subroutines.

• Subroutine 1 (InitLED) - Initialize I/O ports and LED state.

• Subroutine 2 (LEDonoff) – Turn the LED ON or OFF, according to a parameter passed to the subroutine in register R0.

• Subroutine 3 (Delay) – Implement a one-second time delay (i.e. “do nothing” for about one second.) • Main Program – Call the three subroutines to produce the behavior described in the problem statement.
Step 2 – Button-controlled blinking LED
Modify the program from Step 1 so that the LED state is “frozen” at its current state (ON or OFF) if the user button is being held down, and then continues blinking when the button is released. Add two additional subroutines.

• Subroutine 4 (InitButton) – Initialize the I/O port pin connected to the User button.

• Subroutine 5 (CheckButton) – Check the state of the user button and return 1 in register R0 if the button is pressed or 0 if the button is not pressed.

Explanation / Answer

ORG 0000H // reset address and initializing

InitLED MOV PSW, #00

LEDonoff: CPL P1.0 // complementing LED connected to port P1

Delay: DJNZ R0, Delay // delay

MAIN:

CALL InitLED

CALL LEDonoff

MOV R0, #0FFH

CALL Delay

AJMP LEDonoff

END

USING SWITCH-----------

InitButton: MOV P0, #83H

CheckButton: MOV A, P0

MAIN:

CALL InitLED

CALL LEDonoff

CALL InitButton

CALL CheckButton

  RRC A

JC NXT

CLR P0.7

SJMP CheckButton

NXT: RRC A

JC CheckButton

SETB P0.7

SJMP CheckButton

MOV R0, #0FFH

CALL Delay

AJMP LEDonoff

END

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