2018-05-29 10:19:27 +08:00
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# STM32L476-nucleo 板级支持包
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## 1. 简介
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2018-05-29 10:26:54 +08:00
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[STM32F411-nucleo](http://www.st.com/resource/en/data_brief/nucleo-f411re.pdf) 是由意法半导体推出的搭载Cortex-M4内核的高性能微控制器开发板，包括如下硬件特性：
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2018-05-29 10:19:27 +08:00
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| 硬件 | 描述 |
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| -- | -- |
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2018-05-29 10:26:54 +08:00
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|芯片型号| [STM32F411RE](http://www.st.com/en/microcontrollers/stm32f411re.html) |
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2018-05-29 10:19:27 +08:00
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|CPU | Cortex-M4 |
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|主频 | 100MHz |
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|Flash| 512kB |
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|SRAM | 128KB |
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2018-05-29 10:26:54 +08:00
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2018-05-29 10:19:27 +08:00
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## 2. 编译说明
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| 环境 | 说明 |
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| ------------ | ------------------------------------------------------------ |
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| PC操作系统 | Linux/MacOS/Windows |
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| 编译器 | arm-none-eabi-gcc version 6.3.1 20170620 (release)/armcc/ |
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| 构建工具 | scons/mdk5 |
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| 依赖软件环境 | Env工具/(MDK或arm-none-eabi-gcc)/git/调试器驱动 |
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1) 下载源码
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```bash
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git clone https://github.com/RT-Thread/rt-thread.git
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```
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2) 配置工程并准备env
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* Windows
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>在[RT-Thread官网][1]下载ENV工具包
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* Linux/Mac
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```bash
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cd rt-thread/bsp/stm32l476-nucleo
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scons --menuconfig
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source ~/.env/env.sh
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pkgs --upgrade
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```
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3) 生成工程(Mac/Linux下请跳过此步骤)
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* Windows MDK5
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```bash
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scons --target=mdk5 -s
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```
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4) 编译
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* Windows
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使用MDK或IAR请参见对应教程。Windows下使用ENV工具，已经携带GNU GCC工具链，只需要在console下在`bsp/stm32f411-nucleo`目录下使用
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```bash
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scons
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```
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即可编译成功。
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* Linux/MAC
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请使用以下指令设置gcc路径
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```bash
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export RTT_EXEC_PATH=[GCC路径]
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```
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而后在`rt-thread/bsp/stm32f411-nucleo`目录下使用
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```bash
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scons
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```
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即可编译成功。
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GNU GCC编译成功，会在最后有如下类似信息显示：
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```bash
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LINK rtthread-stm32f411.elf
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arm-none-eabi-objcopy -O binary rtthread-stm32f411.elf rtthread.bin
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arm-none-eabi-size rtthread-stm32f411.elf
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text data bss dec hex filename
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55916 208 2456 58580 e4d4 rtthread-stm32f411.elf
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scons: done building targets.
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```
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并产生rtthread-stm32f411.elf、rtthread.bin文件。其中rtthread.bin为二进制固件
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## 3. 烧写及执行
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对于STM32F411-Nucleo开发板，在Windows上可以直接把rtthread.bin文件拖到U盘中实现烧写。在Linux下，请查找Linux下如何使用 ST-Link 的教程。
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**注：**
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如果需要使用Keil MDK来调试GNU GCC编译后的映像文件，可以在编译出`rt-thread/bsp/stm32f411-nucleo/rtthread-stm32f411.elf`后，把这个文件改名成`rtthread-stm32f4xx.axf`，
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并放置于build目录下。然后在Keil MDK工程配置的Debug页中，把`Run to main()`选项拿掉，然后直接点击下载或调试即可进行调试（千万别再编译这个工程）。
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### 3.1 运行结果
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如果编译 & 烧写无误，会在串口2上看到RT-Thread的启动logo信息：
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```bash
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\ | /
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- RT - Thread Operating System
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/ | \ 3.0.4 build May 29 2018
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2006 - 2018 Copyright by rt-thread team
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msh >
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```
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## 4. 驱动支持情况及计划
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| 驱动 | 支持情况 | 备注 |
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| ---------- | :------: | :--------------------------: |
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| UART | 支持 | UART2 |
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### 4.1 IO在板级支持包中的映射情况
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| IO号 | 板级包中的定义 |
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| -- | -- |
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| PA2 | USART2 TX |
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| PA3 | USART2 RX |
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## 5. menuconfig Bsp菜单详解
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| 选项 | 解释 |
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| -- | -- |
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| Using UART2 | 开启串口2，设备名为"uart2" |
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[1]: https://www.rt-thread.org/page/download.html
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