An assembly program that processes user-input commands to manipulate circular first-in first-out queues. The FRDM-KL05Z board from NXP is used.

When a microcontroller is given a user-input command, a certain flag is set which indicates that input has been received and needs to be processed. This program uses a serial I/O driver, which interrupts the program when the flag is set in order to process the command. The program can process commands to enqueue a character, dequeue a character, check the size and starting and ending address of the queue, print the contents of the queue, and print a help message that clarifies the commands.

• A method to compile the source files into an executable (e.g. Keil uVision5)
• KL05 board connected to a terminal (e.g. PuTTY)

• Download the source files provided to your directory of choice

git clone [email protected]:Helena-Lynd/queue-operations.git

• Compile the source files into an executable
  • If using an IDE, use the "Build" or "Rebuild" feature

• Load the executable to your boards flash memory
  • If using an IDE, use the "Download" feature
• Run the program with a connected terminal window open
  • The board has a button that can be pressed to initiate the program
• Input one of the following commands (uppercase and lowercase commands are both accepted):
  • D : (Dequeue) Removes a character from the queue. The queue follows a first-in first-out format. If the queue is empty, prints a failure message.
  • E : (Enqueue) Enqueues a character to the queue. If the queue is full, prints a failure message.
  • H : (Help) Prints a help message to clarify commands.
  • P : (Print) Prints the contents of the queue, from first in to last in.
  • S : (Status) Prints the starting address of the queue, ending address of the queue, and number of elements currently enqueued.

The queue size is set to 4. This can be changed by updating the value of "Q_BUF_SZ" in the EQUates section of the asm-src-code file.

Helena Lynd