2020-05-25 17:30:05 +08:00
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# Raspberry PI 4板级支持包说明
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## 1. 简介
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树莓派4B的核心处理器为博通BCM2711（四核1.5GHz，Cortex A72架构，树莓派3是四核A53）。LPDDR4内存，由5V/3A USB-C供电或GPIO 5V。
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外设支持上，引入了双频Wi-Fi，蓝牙5.0，千兆网卡，MIPI CSI相机接口，两个USB口，40个扩展帧。
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这份RT-Thread BSP是针对 Raspberry Pi 4的一份移植，树莓派价格便宜, 使用者甚众，是研究和运行RT-Thread的可选平台之一。
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## 2. 编译说明
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推荐使用[env工具](https://www.rt-thread.org/page/download.html)，可以在console下进入到`bsp\raspberry-pi\raspi4-32`目录中，运行以下命令：
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```
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scons
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```
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来编译这个板级支持包。如果编译正确无误，会产生rtthread.elf、kernel7.img文件。
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## 3. 执行
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### 3.1 下载**Raspberry Pi Imager**，生成可以运行的raspbian SD卡
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首先下载镜像
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* [Raspberry Pi Imager for Ubuntu](https://downloads.raspberrypi.org/imager/imager_amd64.deb)
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* [Raspberry Pi Imager for Windows](https://downloads.raspberrypi.org/imager/imager.exe)
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* [Raspberry Pi Imager for macOS](https://downloads.raspberrypi.org/imager/imager.dmg)
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### 3.2 准备好串口线
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目前版本是使用raspi4的 GPIO 14, GPIO 15来作路口输出，连线情况如下图所示：
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串口参数： 115200 8N1 ，硬件和软件流控为关。
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### 3.3 程序下载
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当编译生成了rtthread.bin文件后，我们可以将该文件放到sd卡上，并修改sd卡中的`config.txt`文件如下：
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```
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enable_uart=1
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arm_64bit=0
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kernel_addr=0x8000
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kernel=kernel7.img
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2020-05-26 13:34:02 +08:00
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core_freq=250
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2020-05-25 17:30:05 +08:00
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```
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按上面的方法做好SD卡后，插入树莓派4，通电可以在串口上看到如下所示的输出信息：
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```text
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heap: 0x00044270 - 0x04044270
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\ | /
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- RT - Thread Operating System
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/ | \ 4.0.3 build May 25 2020
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2006 - 2020 Copyright by rt-thread team
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Hi, this is RT-Thread!!
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msh />
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```
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## 4. 支持情况
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| 驱动 | 支持情况 | 备注 |
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| ------ | ---- | :------: |
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2020-05-26 13:34:02 +08:00
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| UART | 支持 | UART0,UART2,UART3,UART4,UART5 |
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2020-05-25 17:30:05 +08:00
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## 5. 联系人信息
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维护人：[bernard][5]
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[1]: https://www.rt-thread.org/page/download.html
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[2]: https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-a/downloads
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[3]: https://downloads.raspberrypi.org/raspbian_lite_latest
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[4]: https://etcher.io
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[5]: https://github.com/BernardXiong
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