Write a program in PLP assembly that repeatedly reads the value of the switches

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

Learning Objectives:

● Use PLP branch instructions

● Read from a memory mapped I/O device

 

The Task:

Write a program in PLP assembly that repeatedly reads the value of the switches (address: 0xf0100000) and displays a pattern on the LED array based on what switches. Each time the switch value is read, the pattern should be displayed (regardless of whether the switch value has changed or not since the last time it was read). The table below indicates the pattern that should be displayed for each possible switch setting:

 

Switch

Number Hexadecimal

Switch Value Binary

Switch Value Decimal

Switch Value LED Pattern

0 0x00000001 0b00000001 1 Turn on LEDs 0, 1, 2, and 3, then set all 8

LEDs to off

1 0x00000002 0b00000010 2 Turn on LEDs 4, 5, 6 and 7, then set all 8

LEDs to off

2 0x00000004 0b00000100 4 Create a scrolling pattern that moves from right to left starting with LED 1 and skipping every other LED. Only one LED should be on at any given time (i.e., LED 1, then LED 3, then LED 5, then LED 7) and the pattern should end with all LEDs

off.

Other Other Other Other All LEDs off

 

Hint: Logical shifts are not required to complete this project, but they can be used to make your program shorter and more readable than hard coding every value to be written to the LEDs. Shifts can also be useful to generate the value that you compare with the value of the switches.

 

Deliverables:

1. Take the Project 2 Pre Quiz (2 points)

2. Submit your program on Canvas with the format: Firstname_Lastname_project2.plp (16 points)

3. Take the Project 2 Post Quiz (2 points)

 

 

Attachments:

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