---
title: nuttx
categories: embedded, arm, stm32, stm32f429
toc: no
...

組員
----
* 翁振育
* 黃亮穎
* 蘇偉嘉
* 李英碩

Nuttx 參考應用
---------------
* `PX4 autopilot<http://pixhawk.org/dev/nuttx/start>`_

NuttX 架構
------------
＊ 可混用task跟thread。
＊ 支援FPU。
＊ 可混用FIFO跟RR。

與平台相關
------------

Run FreeRTOS on STM32F4-Discovery
------------

Task state
------------
| enum tstate_e
| {
|   TSTATE_TASK_INVALID    = 0, /* INVALID      - The TCB is uninitialized */
|   TSTATE_TASK_PENDING,        /* READY_TO_RUN - Pending preemption unlock */
|   TSTATE_TASK_READYTORUN,     /* READY-TO-RUN - But not running */
|   TSTATE_TASK_RUNNING,        /* READY_TO_RUN - And running */
|
|   TSTATE_TASK_INACTIVE,       /* BLOCKED      - Initialized but not yet activated */
|   TSTATE_WAIT_SEM,            /* BLOCKED      - Waiting for a semaphore */
| #ifndef CONFIG_DISABLE_SIGNALS
|   TSTATE_WAIT_SIG,            /* BLOCKED      - Waiting for a signal */
| #endif
| #ifndef CONFIG_DISABLE_MQUEUE
|   TSTATE_WAIT_MQNOTEMPTY,     /* BLOCKED      - Waiting for a MQ to become not empty. */
|   TSTATE_WAIT_MQNOTFULL,      /* BLOCKED      - Waiting for a MQ to become not full. */
| #endif
| #ifdef CONFIG_PAGING
|  TSTATE_WAIT_PAGEFILL,       /* BLOCKED      - Waiting for page fill */
| #endif
|   NUM_TASK_STATES             /* Must be last */
| };
Task list 
------------

TCB 
------------

Communication
------------

Scheduling
------------

Interrupt handler
------------

測試環境架設
------------

硬體驅動原理
------------
* `UART<embedded/USART>`_
* FPU (Floating Point Unit)

效能表現
--------

參考資料
--------
* https://github.com/deadbeefcafe/nuttx-stm32f4disc-bb
* http://bibliodigital.itcr.ac.cr/xmlui/bitstream/handle/2238/3051/FinalReport.pdf