AVR32 UC3 - FreeRTOS Real Time Kernel Documentation

Introduction

This is the documentation for the data structures, functions, variables, defines, enums, and typedefs for the FreeRTOS application.

FreeRTOS.orgTM is a portable, open source, mini Real Time Kernel - a free to download and royalty free RTOS that can be used in commercial applications (see license text). This site shows how a complete embedded real time system can be created from a Windows host using quality open source development tools (where available). See the FreeRTOS.org features summary. Highlights include:

• Free RTOS kernel - preemptive, cooperative and hybrid configuration options.
• Designed to be small, simple and easy to use.
• Very portable code structure predominantly written in C.
• Supports both tasks and co-routines.
• No software restriction on the number of tasks that can be created.
• No software restriction on the number of priorities that can be used.
• No restrictions imposed on priority assignment - more than one task can be assigned the same priority.
• Queues and semaphores for communication and synchronisation between tasks, or between tasks and interrupts.
• Free embedded software source code.
• Royalty free.
• Cross development from a standard Windows host.
• Pre-configured demo applications for selected single board computers allowing 'out of the box' operation and fast learning curve.
• Compile time configuration allows small FLASH footprint
• The SafeRTOS derivative product provides a high level of confidence in the code integrity.

Main Files

• main.c : FreeRTOS example

Compilation Information

This software is written for GNU GCC for AVR32 and for IAR Embedded Workbench for Atmel AVR32. Other compilers may or may not work.

Device Information

All AVR32 devices can be used.

Configuration Information

This example has been tested with the following configuration:

• EVK1100, EVK1101, EVK1104 or EVK1105 evalutation kit;
• CPU clock: 12 MHz;
• USART1 (on EVK1100 or EVK1101) connected to a PC serial port via a standard RS232 DB9 cable, or USART0 (on EVK1105) or USART1 (on EVK1104) abstracted with a USB CDC connection to a PC;
• PC terminal settings:
  • 57600 bps,
  • 8 data bits,
  • no parity bit,
  • 1 stop bit,
  • no flow control.
• The application is made as the USART1 should be looped back by connecting the TX line with the RX line.
  • On EVK1100, connect pin number 39 (PA05) with 41 (PA06) with AT32UC3A0512 in QFP144 package.
  • On EVK1101, connect pin number 47 (PA23) with 59 (PA24) with AT32UC3B0256 in QFP64 package.

Check the LEDs for all EVKs. The LEDs should blink at different rates.
On the PC terminal, you should also see the following message:

 ../../main.c:176: Starting the FreeRTOS AVR32 UC3 Demo...
 ABCDEFGHIJKLMNOPQRSTUVWXABCDEFGHIJKLMNOPQRSTUVWXABCDEFGHIJKLMNOPQRSTUVWXABCDEFGH
 IJKLMNOPQRSTUVWXABCDEFGHIJKLMNOPQRSTUVWXABCDEFGHIJKLMNOPQRSTUVWXABCDEFGHIJKLMNO

The ABCD... sequence should be printed recurently on the terminal, which means the communication through the USART is established and is working.

Contact Information

For further information, visit Atmel AVR32. and FreeRTOS home page.
Support and FAQ: http://support.atmel.no/