[Bsp]Add readme for stm32f40x
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## board info:
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# STM32F40x 板级支持包
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STM32F4 discovery
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http://www.st.com/internet/evalboard/product/252419.jsp
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## 1. 简介
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## note:
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STM32F40x 是由意法半导体推出的Cortex-M4内核的高性能单片机
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包括如下硬件特性：
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in drivers/stm32f4xx_conf.h
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| 硬件 | 描述 |
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| -- | -- |
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|芯片型号| STM32F40x全系列 |
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|CPU| Cortex-M4 |
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|主频| 84MHz-208MHz |
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```c
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/* Redefine the HSE value; it's equal to 8 MHz on the STM32F4-DISCOVERY Kit */
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efine HSE_VALUE ((uint32_t)8000000)
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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/iar |
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| 构建工具 | scons/mdk5/iar |
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| 依赖软件环境 | Env工具/(MDK或IAR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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**================= IAR WARNING =================**
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After use `scons --target=iar -s` command to product IAR project, you have to add iar link file manually.
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IAR IDE steps:
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1. Project-->Options-->Linker
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2. Config-->Linker Configuration file
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3. select `Override Default`, then select `bsp/stm32f40x/stm32f40x_flash.icf`
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4. rebuild project
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2) 配置工程并准备env
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**TODO**
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（Linux/Mac）
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auto add *.icf by scons script
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```bash
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cd rt-thread/bsp/stm32f40x
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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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（Windows）
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>在[RT-Thread官网][1]下载ENV工具包
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3) 配置芯片型号
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（Linux/Mac）
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```bash
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scons --menuconfig
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```
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（Windows(ENV环境中)）
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```bash
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menuconfig
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```
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在menuconfig页面配置并选择对应的芯片型号，若开发环境为MDK/IAR，则需要生成工程
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4) 生成工程(Mac/Linux下请跳过此步骤)
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（Windows IAR）
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```bash
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SET RTT_CC=iar
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scons --target=iar -s
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```
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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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（Windows MDK4）
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```bash
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scons --target=mdk4 -s
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```
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5) 编译
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使用MDK或IAR请参见对应教程
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（Windows arm-none-eabi-gcc）
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使用以下指令设置gcc路径
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```bash
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SET RTT_EXEC_PATH=[GCC路径]
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```
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（Linux/Mac arm-none-eabi-gcc）
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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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编译（WindowsLinux/Mac arm-none-eabi-gcc）
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```bash
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scons -j4
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```
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出现下列信息即为编译成功
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```bash
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LINK rtthread-stm32f4xx.elf
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arm-none-eabi-objcopy -O binary rtthread-stm32f4xx.elf rtthread.bin
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arm-none-eabi-size rtthread-stm32f4xx.elf
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text data bss dec hex filename
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41596 356 1456 43408 a990 rtthread-stm32f4xx.elf
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scons: done building targets.
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```
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如果编译正确无误，会产生rtthread-stm23f4xx.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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烧写可以使用仿真器 ISP等多种方式 此处不再赘述
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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 15 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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*默认串口
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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 | UART1/2/3/4/5 |
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| GPIO | 支持 | / |
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| hwtimer | 支持 | / |
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| RTC | 支持 | / |
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| eth | 支持 | LAN8720A |
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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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| PB6 | USART1 TX |
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| PB7 | USART1 RX |
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| PA2 | USART2 TX |
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| PA3 | USART2 RX |
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| PD8 | USART3 TX |
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| PD9 | USART3 RX |
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| PC10 | UART4 TX |
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| PC11 | UART4 RX |
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| PC12 | UART5 TX |
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| PD2 | UART5 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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| Enable UART1 (PB6/7) | 开启串口1，串口1的设备名为"uart1" |
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| Enable UART2 (PA2/3) | 开启串口2，串口1的设备名为"uart2" |
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| Enable UART3 (PD8/9) | 开启串口3，串口1的设备名为"uart3" |
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| Enable UART4 (PC10/11) | 开启串口4，串口1的设备名为"uart4" |
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| Enable UART5 (PC12/PD2) | 开启串口5，串口1的设备名为"uart5" |
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*部分选项需要在RT-Thread组件菜单中开启对应的设备框架才能显示。
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## 6. 联系人信息
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维护人:
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[uestczyh222][4] < [lymz@foxmail.com][5] >
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[1]: https://www.rt-thread.org/page/download.html
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[4]: https://github.com/uestczyh222
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[5]: mailto:lymz@foxmail.com
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