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title: Lab32: QEMU + FreeRTOS
toc: no
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預期目標
------------
- 體驗一個具體而微的 MCU 程式開發過程，使用 GNU Toolchain
- 藉由 QEMU 模擬環境，嘗試控制週邊 (STM32 USART) 並觀察其行為
- 接觸 FreeRTOS

預先準備
-------
- 安裝 Ubuntu Linux，建議版本為 14.04
- 安裝必要的套件

.. code-block:: prettyprint

    sudo apt-get install git zlib1g-dev libsdl1.2-dev automake* autoconf* libtool libpixman-1-dev

- 若 Ubuntu 使用 **64bit 版本** ，請額外安裝 lib32gcc1 之套件

.. code-block:: prettyprint

    sudo apt-get install lib32gcc1 lib32ncurses5

- 取得 GNU Toolchain: `toolchain-2012_03.tar.bz2</embedded/Lab1/toolchain-2012_03.tar.bz2>`_ 、保存到 /tmp 目錄，並且解開到系統中，操作如下

.. code-block:: prettyprint

    cd  /
    sudo tar jxvf /tmp/toolchain-2012_03.tar.bz2

- 檢查 Toolchain 是否正確安裝：``ls /usr/local/csl/arm-2012.03/``


STM32 Overview
--------------
- Powerful but Cheap
  - Wireless Connectivity
  - Computing/Prototyping
  - One for most use cases
  - open source: http://code.google.com/hosting/search?q=label:STM32 

.. image:: /STM32-P103-01.jpg

STM32 on QEMU 環境建立與測試
--------------------------

.. code-block:: prettyprint

    mkdir -p workspace
    cd workspace
    git clone git://github.com/beckus/stm32_p103_demos.git
    git clone git://github.com/beckus/qemu_stm32.git

    cd qemu_stm32
    ./configure --disable-werror --enable-debug \
        --target-list="arm-softmmu" \
        --extra-cflags=-DDEBUG_CLKTREE \
        --extra-cflags=-DDEBUG_STM32_RCC \
        --extra-cflags=-DDEBUG_STM32_UART \
        --extra-cflags=-DSTM32_UART_NO_BAUD_DELAY \
        --extra-cflags=-DSTM32_UART_ENABLE_OVERRUN
    make
    cd ../stm32_p103_demos
    export PATH=/usr/local/csl/arm-2012.03/bin:$PATH
    make all
    make blink_flash_QEMURUN
    make button_QEMURUN
    make uart_echo_QEMURUN

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