2018-05-30 22:17:25 +08:00
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# HIFIVE1 #
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## 简介
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2018-09-30 18:07:34 +08:00
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[HIFIVE1](https://www.sifive.com/products/hifive1/) 是由 SiFive 公司推出的全球首款基于开源指令集 RISC-V 架构的商用 SoC Freedom E310 的开发板。
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2018-05-30 22:17:25 +08:00
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2018-09-30 18:07:34 +08:00
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
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### 板载资源:
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2018-05-30 22:17:25 +08:00
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| 硬件 | 描述 |
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| -- | -- |
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2018-09-30 18:07:34 +08:00
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| 内核 | SiFive E31 RISC-V Core |
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| 架构 | 32-bit RV32IMAC |
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| 主频 | 320+ MHz |
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| 性能 | 1.61 DMIPs/MHz, 2.73 Coremark/MHz |
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2018-05-30 22:17:25 +08:00
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|SRAM| 16KB |
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|Flash| 16MB QSPI + 16KB 指令Cache |
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## 编译说明
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2018-09-30 18:07:34 +08:00
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### 下载 Freedom Studio
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Freedom Studio 是 SiFive 公司推出的一个集成开发环境,用来编写和调试基于 SiFive 处理器的软件。内嵌了编译好的 RISC-V GCC 工具链、OpenOCD、以及一些示例和文档。
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下载地址:[官网下载](https://www.sifive.com/products/tools/)
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
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下载成功之后,解压到和 rt-thread 源码同一目录下
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
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### 配置工具链
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工具链就在解压开的 IDE `F:\FreedomStudio\SiFive\riscv64-unknown-elf-gcc-20171231-x86_64-w64-mingw32\bin` 目录下。
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在源码 `rt-thread/bsp/hifive1/` 目录下,运行 env 工具,输入下面的命令设置 gcc 工具链路径
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```
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set RTT_EXEC_PATH=F:\FreedomStudio\SiFive\riscv64-unknown-elf-gcc-20171231-x86_64-w64-mingw32\bin
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```
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### 添加环境变量
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将 **工具链**和**编译工具**的路径 添加到环境变量里,输入命令如下
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```
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set path=%path%;工具链的路径;编译工具的路径;
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```
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例如:
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```
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set path=%path%;F:\FreedomStudio\SiFive\riscv64-unknown-elf-gcc-20171231-x86_64-w64-mingw32\bin;F:\FreedomStudio\build-tools\bin
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```
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
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### 从 env 工具打开 IDE
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利用 cd 命令,切换到解压开的 IDE 目录
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
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输入 Freedom Studio 按 Tab 键 自动补全,然后按回车运行 IDE。
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
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在弹出的窗口输入 workspace 创建工作空间,然后点击启动打开 IDE。
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
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### 导入工程
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在菜单栏点击 `File->Import`
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
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按照下面的图片导入工程
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
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
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### 编译
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
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然后等待编译完成
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
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2018-05-30 22:17:25 +08:00
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## 烧写及执行
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2018-09-30 18:07:34 +08:00
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### 安装驱动
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1. 使用 Micro USB 线连接电脑和开发板。
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2. 然后双击安装 IDE 目录 `F:\FreedomStudio\SiFive\Drivers` 下的驱动文件
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### 添加字符串定义
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点击菜单栏 `Window->preferences` 按下图的步骤将 字符串 `cross_prefix` 定义为 `riscv64-unknown-elf-`
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
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### 配置 Debug 参数
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2018-09-30 18:07:34 +08:00
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选中生成的 `rtthread.elf` 文件,右键配置 Debug 参数,如下图所示
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
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按下图新建一个 Debug 选项
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
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打开 `Debugger` 选项卡 添加如下参数
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```
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-f openocd.cfg
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set mem inaccessible-by-default off
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set arch riscv:rv32
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set remotetimeout 250
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```
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如下图所示:
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
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打开 `startup` 选项卡,去掉**主机模式**和**复位命令**
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
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然后待程序停止在 main 函数处,然后点击继续运行程序就运行起来了。
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
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2018-05-30 22:17:25 +08:00
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### 运行结果
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下载程序之后,连接串口(115200-N-8-1),可以看到RT-Thread的输出信息:
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```
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\ | /
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- RT - Thread Operating System
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/ | \ 3.0.4 build May 30 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 | UART0_RX/TX:GPIO 16/17 |
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2018-05-30 22:17:25 +08:00
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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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| GPIO19 | LED_GREEN |
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| GPIO21 | LED_BLUE |
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| GPIO22 | LED_RED |
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## 5. 联系人信息
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维护人:
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- [tanek](https://github.com/TanekLiang)
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## 6. 参考
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* [HIFIVE1 Info](https://www.sifive.com/products/hifive1/)
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* [HIFIVE1 Software Development Tools](https://www.sifive.com/products/tools/)
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* [hifive1-getting-started-guide](https://www.sifive.com/documentation/boards/hifive1/hifive1-getting-started-guide/)
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* [hifive1-schematics](https://www.sifive.com/documentation/boards/hifive1/hifive1-schematics/)
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