MicroC/OS-II Message Box

This application demonstrates the use of MicroC/OS-II Message mailboxes. It also serves as a good starting point for designs using MicroC/OS-II with Nios® II processors. Message mailboxes are generally used to signify the occurrence of an event and/or for inter-task communication. MicroC/OS-II message mailboxes are very similar to message queues and event flags.

The application has three tasks (task1, task2, task3) that post messages to three different message mailboxes (mailbox1, mailbox2, mailbox3). Upon receiving a message, the task increments the value of the message and then passes the new value to the next task through a different message mailbox.

Using This Design Example

Download this example from the Nios Wiki Example section. Follow the instructions in the readme.txt file to run the example.

The use of this design is governed by, and subject to, the terms and conditions of the Altera Hardware Reference Design License Agreement.

Hardware Requirements

This example requires the following devices to be present in the target hardware design:

  • Joint Test Action Group (JTAG) UART
  • Timer

You can run this software design example on the following Nios II hardware design examples:

Stratix® and Stratix II Design Examples

  • Standard
  • Full Featured

Cyclone® Design Examples

  • Standard
  • Full Featured
  • Low Cost

Related Links

For more information about using this example in your project, go to:

Design Examples Disclaimer

These design examples may only be used within Altera Corporation devices and remain the property of Altera. They are being provided on an “as-is” basis and as an accommodation; therefore, all warranties, representations, or guarantees of any kind (whether express, implied, or statutory) including, without limitation, warranties of merchantability, non-infringement, or fitness for a particular purpose, are specifically disclaimed. Altera expressly does not recommend, suggest, or require that these examples be used in combination with any other product not provided by Altera.