µC/OS-II, The Real-Time Kernelis a highly portable, ROMable, very scalable, preemptive real-time, multitasking kernel (RTOS) for microprocessors and microcontrollers.µC/OS-II can manage up to 255 tasks and provides the following services:
This application demonstrates the use of MicroC/OS-II message mailboxes, and additionally, serves as a good starting point for designs using MicroC/OS-II with Nios II. Message mailboxes are generally used to signify the occurance of an event and/or for inter-task communication. MicroC/OS-II message mailboxes are very similar to message queues, except that they do not hold multiple elements like a queue. New mailbox message postings will overwrite previous messages posted to the mailbox even if the messages have not been read by any task.
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.
Note: If you are on Nios II EDS v7.2 and prior then the installation directory already contains this example.
Copy the hardware example design for the developement kit you have from the Nios II EDS installation (C:\\\\altera\\\\<version number>\\\\nios2eds\\\\example\\\\<verilog or vhdl>) to your working directory.
Extracts the contents of the zip file to the software application directory for teh hardware project in your working directory. e.g. \\\\<work dir>\\\\<hardware_design_name>\\\\software_examples\\\\app directory. For example, if you are using the standard verilog hardware design on the Nios II Development Kit, Cyclone II Edition, extract the zip file to /<work dir>\\\\niosII_cycloneII_2c35\\\\standard\\\\\\\\software_examples\\\\app
Refer to the introduction to the II Software Build tools chapter for instructions on building and running the example
The supported Example Hardware Platforms:
Supported Development Boards
Nios Development Board, Stratix II Edition
Nios Development Board, Stratix Professional Edition
Nios Development Board, Stratix Edition
Nios Development Board, Cyclone Edition
System Library settings:
RTOS Type - MicroC/OS-II
Period System Timer - SYS_CLK_TIMER
If this design is run on the ISS, terminal output will take several