251 lines
10 KiB
Markdown
251 lines
10 KiB
Markdown
# 芯来科技FPGA评估板
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## 简介
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**芯来科技FPGA系列板** 是由芯来科技公司推出的用于一系列测试评估芯来RISC-V内核处理器的FPGA评估板。
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更多关于 **芯来科技FPGA评估板** 开发板的详细资料请参见:
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* [Nuclei DDR200T开发板](https://nucleisys.com/developboard.php#ddr200t)
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* [Nuclei MCU200T开发板](https://nucleisys.com/developboard.php#mcu200t)
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* [蜂鸟开发板](https://nucleisys.com/developboard.php#demosoc100t)
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### 板载资源
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| 硬件 | 描述 |
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| --- | --- |
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| 内核 | Nuclei RISC-V N/NX/UX 内核 |
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| 架构 | RV32 or RV64 |
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| 主频 | 16MHz or uncertain freq |
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**注意**: 这个上面烧写的是FPGA bitstream文件，所以处理器内核版本根据型号来定，通过修改**rtconfig.py**中的**NUCLEI_SDK_CORE**.
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## 工具安装
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### 安装工具链
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请根据[安装Nuclei RISC-V GCC Toolchain和OpenOCD](https://doc.nucleisys.com/nuclei_sdk/quickstart.html#setup-tools-and-environment) 来安装依赖的工具。
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### 添加环境变量
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将Nuclei RISC-V GCC Toolchain和OpenOCD的环境变量进行设置。
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#### Windows
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假设工具安装在 **D:\NucleiStudio\toolchain**目录下, 则可以修改系统环境变量**PATH**,
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将**D:\NucleiStudio\toolchain\gcc\bin;D:\NucleiStudio\toolchain\openocd\bin;**增加到**PATH**中。
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或者在ENV工具命令行中运行
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~~~cmd
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set PATH=D:\NucleiStudio\toolchain\gcc\bin;D:\NucleiStudio\toolchain\openocd\bin;%PATH%
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~~~
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#### Linux
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假设工具安装在 **~/NucleiStudio/toolchain**目录下, 通过在Linux的``.bashrc``增加如下一行代码
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来添加环境变量。
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~~~bash
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export PATH=~/NucleiStudio/toolchain/gcc/bin:~/NucleiStudio/toolchain/openocd/bin:$PATH
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~~~
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或者在ENV工具命令行中运行
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~~~bash
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export PATH=~/NucleiStudio/toolchain/gcc/bin:~/NucleiStudio/toolchain/openocd/bin:$PATH
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~~~
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**注意**: 对应的RISC-V GCC和OPENOCD的路径请替换成自己安装的路径。
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## 烧写及执行
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### 驱动设置
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驱动安装设置，请参考[Nuclei FPGA开发板介绍](https://nucleisys.com/upload/files/fpga/doc/Nuclei_FPGA_DebugKit_Intro_202012.pdf)
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### 编译程序
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下载好[RT-Thread](https://github.com/RT-Thread/rt-thread)的代码和[ENV工具](https://www.rt-thread.org/download.html#download-rt-thread-env-tool)以后。
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按照ENV工具的教程, 在**rt-thread\bsp\nuclei\nuclei_fpga_eval**目录打开ENV工具命令行。
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**注意**: 请确保Nuclei GCC和Nuclei OpenOCD的路径设置正确无误。
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1. 运行 ``pkgs --update``来下载最新的依赖的**Nuclei SDK**开发包，修改链接脚本。
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```c
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.stack ORIGIN(RAM) + LENGTH(RAM) - __TOT_STACK_SIZE (NOLOAD) :
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{
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...
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PROVIDE( _sp = . );
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PROVIDE( __rt_rvstack = . );//在链接脚本中补充该条语句
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} >RAM AT>RAM
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```
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2. **可选**: 运行 ``menuconfig``来进行内核配置
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3. 运行 ``scons -c``清理之前的编译结果
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4. 根据你当前评估的Nuclei RISC-V内核情况，修改 ``rtconfig.py``中的``NUCLEI_SDK_CORE``和``NUCLEI_SDK_DOWNLOAD``参数。
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- ``NUCLEI_SDK_CORE``可选的参数为[Supported Nuclei Cores](https://doc.nucleisys.com/nuclei_sdk/develop/buildsystem.html#core)
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- ``NUCLEI_SDK_DOWNLOAD``可选的参数为``ilm``,``flash``或者``flashxip``, 关于该选项的说明参见[Supported Download Modes](https://doc.nucleisys.com/nuclei_sdk/develop/buildsystem.html#download)
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- 假设你手头拿到的Nuclei评估处理器内核为N307(rv32imafc), 想程序运行模式为``flash``,
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则修改``NUCLEI_SDK_CORE``为``n307``, ``NUCLEI_SDK_DOWNLOAD``为``flash``.
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5. 修改完对应的``rtconfig.py``参数配置并保存后，运行 ``scons``来进行代码的编译
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### 下载程序
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在保证程序能够正常编译后, 在相同ENV终端执行``scons --run upload``进行代码的下载。
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正常下载的输出如下:
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~~~
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scons: Reading SConscript files ...
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Supported downloaded modes for board nuclei_fpga_eval are ('ilm', 'flash', 'flashxip'), chosen downloaded mode is ilm
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Upload application rtthread.elf using openocd and gdb
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riscv-nuclei-elf-gdb rtthread.elf -ex "set remotetimeout 240" -ex "target remote | openocd --pipe -f D:/workspace/Sourcecode/rt-thread/bsp/nuclei/nuclei_fpga_eval/packages/nuclei_sdk-latest/SoC/demosoc/Board/nuclei_fpga_eval/openocd_demosoc.cfg"
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--batch -ex "monitor halt" -ex "monitor flash protect 0 0 last off" -ex "load" -ex "monitor resume" -ex "monitor shutdown" -ex "quit"
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D:\Software\Nuclei\gcc\bin\riscv-nuclei-elf-gdb.exe: warning: Couldn't determine a path for the index cache directory.
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Nuclei OpenOCD, i386 Open On-Chip Debugger 0.10.0+dev-g11f0cf429 (2020-07-15-04:09)
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Licensed under GNU GPL v2
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For bug reports, read
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http://openocd.org/doc/doxygen/bugs.html
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rt_list_insert_before (n=0xdeadbeef, l=0x90000f80 <timer_thread_stack+464>) at D:\workspace\Sourcecode\rt-thread\include/rtservice.h:79
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79 n->next = l;
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cleared protection for sectors 0 through 63 on flash bank 0
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Loading section .init, size 0x284 lma 0x80000000
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Loading section .text, size 0xb30a lma 0x800002c0
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Loading section .rodata, size 0x3248 lma 0x8000b5d0
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Loading section .data, size 0x340 lma 0x8000e818
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Start address 0x80000198, load size 60182
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Transfer rate: 48 KB/sec, 10030 bytes/write.
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shutdown command invoked
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A debugging session is active.
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Inferior 1 [Remote target] will be detached.
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Quit anyway? (y or n) [answered Y; input not from terminal]
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[Inferior 1 (Remote target) detached]
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~~~
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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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> 最新发布出去的评估Bit一般都是16MHz, 串口工作在115200bps下串口读取可以正常工作.
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```
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initialize rti_board_start:0 done
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\ | /
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- RT - Thread Operating System
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/ | \ 4.0.3 build Apr 23 2020
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2006 - 2020 Copyright by rt-thread team
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do components initialization.
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initialize rti_board_end:0 done
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initialize dfs_init:0 done
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initialize libc_system_init:0 done
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initialize finsh_system_init:0 done
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msh />
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```
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在串口终端(我这里使用的是TeraTerm)输入``ps``即可查看当前线程工作情况:
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~~~
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msh />ps
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thread pri status sp stack size max used left tick error
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-------- --- ------- ---------- ---------- ------ ---------- ---
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serrxsim 5 suspend 0x00000134 0x0000018c 77% 0x00000005 000
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tshell 20 running 0x000002b0 0x00001000 17% 0x00000005 000
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tidle0 31 ready 0x00000164 0x0000018c 89% 0x0000000b 000
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timer 4 suspend 0x00000120 0x00000200 56% 0x00000009 000
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msh />
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~~~
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### 调试程序
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在保证程序编译成功后, 在相同ENV终端执行``scons --run debug``进行代码在命令行下进行GDB调试。
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正常的调试输出如下:
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~~~
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scons: Reading SConscript files ...
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Supported downloaded modes for board nuclei_fpga_eval are ('ilm', 'flash', 'flashxip'), chosen downloaded mode is ilm
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Debug application rtthread.elf using openocd and gdb
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riscv-nuclei-elf-gdb rtthread.elf -ex "set remotetimeout 240" -ex "target remote | openocd --pipe -f D:/workspace/Sourcecode/rt-thread/bsp/nuclei/nuclei_fpga_eval/packages/nuclei_sdk-latest/SoC/demosoc/Board/nuclei_fpga_eval/openocd_demosoc.cfg"
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D:\Software\Nuclei\gcc\bin\riscv-nuclei-elf-gdb.exe: warning: Couldn't determine a path for the index cache directory.
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GNU gdb (GDB) 8.3.0.20190516-git
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Copyright (C) 2019 Free Software Foundation, Inc.
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law.
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Type "show copying" and "show warranty" for details.
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This GDB was configured as "--host=i686-w64-mingw32 --target=riscv-nuclei-elf".
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Type "show configuration" for configuration details.
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For bug reporting instructions, please see:
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<http://www.gnu.org/software/gdb/bugs/>.
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Find the GDB manual and other documentation resources online at:
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<http://www.gnu.org/software/gdb/documentation/>.
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For help, type "help".
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Type "apropos word" to search for commands related to "word"...
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Reading symbols from rtthread.elf...
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Remote debugging using | openocd --pipe -f D:/workspace/Sourcecode/rt-thread/bsp/nuclei/nuclei_fpga_eval/packages/nuclei_sdk-latest/SoC/demosoc/Board/nuclei_fpga_eval/openocd_demosoc.cfg
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Nuclei OpenOCD, i386 Open On-Chip Debugger 0.10.0+dev-g11f0cf429 (2020-07-15-04:09)
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Licensed under GNU GPL v2
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For bug reports, read
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http://openocd.org/doc/doxygen/bugs.html
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0x0000000080000e80 in rt_thread_idle_entry (parameter=<optimized out>)
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at D:\workspace\Sourcecode\rt-thread\src\idle.c:253
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253 idle_hook_list[i]();
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(gdb) load
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Loading section .init, size 0x284 lma 0x80000000
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Loading section .text, size 0xb30a lma 0x800002c0
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Loading section .rodata, size 0x3248 lma 0x8000b5d0
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Loading section .data, size 0x340 lma 0x8000e818
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Start address 0x80000198, load size 60182
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Transfer rate: 49 KB/sec, 10030 bytes/write.
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(gdb) b main
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Breakpoint 1 at 0x800002c0: file applications\main.c, line 35.
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(gdb) c
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Continuing.
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Breakpoint 1, main () at applications\main.c:35
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35 board_serial_init();
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(gdb) n
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rt_thread_exit () at D:\workspace\Sourcecode\rt-thread\src\thread.c:277
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277 return rt_current_thread;
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(gdb) c
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Continuing.
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~~~
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调试例子参见如下文档:
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* https://doc.nucleisys.com/nuclei_sdk/quickstart.html#debug-application
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为了更方便的进行调试, 也可以下载**Nuclei Studio**集成开发环境, 创建一个Debug Configuration, 选择编译好的
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ELF文件, 然后配置OPENOCD和GDB即可, OPENOCD配置文件路径为**bsp\nuclei\nuclei_fpga_eval\packages\nuclei_sdk-latest\SoC\demosoc\Board\nuclei_fpga_eval\openocd_demosoc.cfg**
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## 驱动支持情况
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| 驱动 | 支持情况 | 备注 |
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| ------ | ---- | :------: |
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| UART | 支持 | 蜂鸟开发板载串口是UART0 |
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**注:**
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- 适配RT-Thread的驱动框架的代码在 [../libraries/demosoc/HAL_Drivers](../libraries/demosoc/HAL_Drivers)目录下。
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- 如果有开发者想适配更多的驱动, 请在对应目录下增加驱动适配支持。
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- 目前串口读取功能在主频为8MHz情况下需要工作在57600bps, 目前发布的Bit一般都是16Mhz
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- 目前串口读取没有采用中断的方式进行，而是采用单独的任务来读取，等中断信号接入后可以直接中断方式读取
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## 联系人信息
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维护人:
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- [fanghuaqi](https://github.com/fanghuaqi)
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