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版本 02442b7a33cf04b3e88304cfdca16d6cb8d32c57

Lab22: RTOS

預期目標

  • 在 QEMU 模擬的 STM32 環境中,嘗試執行 FreeRTOS<http://www.freertos.org/>_ 並且學習相關的操作
    • 熟悉 FreeRTOS 的內部運作機制
  • 學習 memory mangement
    • 實作 malloc 和驗證其功能

FreeRTOS

  • The Architecture of Open Source Applications: FreeRTOS<http://www.aosabook.org/en/freertos.html>_
    • 簡體中文翻譯<http://www.ituring.com.cn/article/4063>_

FreeRTOS: Memory management

  • Memory Management<http://www.freertos.org/a00111.html>_
  • The RTOS kernel allocates RAM each time a task, queue, mutex, software timer or semaphore is created. The standard C library malloc() and free() functions can sometimes be used for this purpose, but …
    • they are not always available on embedded systems,
    • they take up valuable code space,
    • they are not thread safe, and
    • they are not deterministic (the amount of time taken to execute the function will differ from call to call)

參考作業提案

作業繳交方式

  • 更新作業提案到共筆網站: Lab 22 / 作業共筆<https://embedded2013.hackpad.com/Lab21-RTOS-shzzlckJ50f>,需要標注自己的 ID,可參考 Lab 20 / 作業共筆<https://embedded2013.hackpad.com/Lab20-GNU-Toolchain-zI6gzN3uv1c> 格式
  • 在 Oct 25, 2013 前,將符合作業提案的程式碼,提交到自行 fork 的 repository
    • https://github.com/embedded2013/freertos

參考資訊

  • FreeRTOS Implementation<http://www.freertos.org/implementation/main.html>_