POWERLINK协议源码(最新)在stm32单片机上的移植指南-Toy模板网

这篇具有很好参考价值的文章主要介绍了POWERLINK协议源码(最新)在stm32单片机上的移植指南。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

最近着了powerlink的道，连续几晚十二点前没睡过觉。不得不说兴趣这东西劲太大了，让人睡不着。喜欢上研究POWERLINK，最新版的源码结构挺清晰的，移植并测试了嵌入式linux作为从站和电脑主站之间的通信，挺有趣的。接下来想尝试下在单片机上的移植，降低POWERLINK协议的使用门槛，让POWERLINK协议可以用的更广泛，算是件有意义的事。

以下分享下openPOWERLINK最新源码v2.7.2在单片机上的移植思路。

使用倒推法（由编译结果去推导需要依赖的代码文件），能够直观的看到平台差异性相关的文件。因此移植也很简单，照着以下指南来，肯定没问题。

openPOWERLINK最新源码地址：openPOWERLINK :: openPOWERLINK

powerlink不错的协议，但国人大都去卷ethercat了。我想powerlink这么好的协议真没啥难的，了解后会觉得比485总线还好用。之前就难资料太少，没人去研究推动和分享，我想趁我兴致正浓就多输出几篇分享给大家。

POWERLINK协议源码(最新)在stm32单片机上的移植指南

前提条件

openPOWERLINK源码要想成功运行在单片机上，需要一定的前提条件。最起码单片机板子上得有以太网功能吧。至于是否得有tcp/ip协议栈才能运行powerlink? 这个是非必要的，也就是说即便单片机板子上只有MCU+MAC+PHY芯片，没有移植lwip协议栈也是可以的。

如果是单片机mcu内核涵盖MAC链路层功能，则直接外接一颗PHY芯片即可。这需要单片机具备mac接口，一般像stm32F4系列以上的稍微高端点的单片机才具有mac功能。

媒体访问控制(MAC，Media Access Control)，又称作介质访问控制，简称MAC，是局域网中数据链路层的下层部分，提供地址及媒体访问的控制方式，使得不同设备或网络上的节点可以在多点的网络上通信，而不会互相冲突，上述的特性在局域网中格外重要。早期网络发展时以MAC判别各个网络接口的位置，但后来互联网发展后，才有IP的制定与使用。若只是两台设备之间全双工的通信，因为两台设备可以同时发送及接收数据，不会冲突，因此不需要用到MAC协议。

媒体访问控制MAC子层负责解决与媒体接入有关的问题，在物理层的基础上进行无差错的通信。

MAC子层是网络与设备的接口，它从网络层接收数据帧，然后通过媒体访问规则和物理层将数据帧发送到物理链路上。它也从物理层接收数据帧，再送到网络层。总的来说，MAC有三大功能：

1.决定节点何时发送数据包。
2.将数据帧发送到物理层，然后发送到物理链路。
3.从物理层接收数据帧，然后送给网络层处理。
其中最重要的是第一点：决定节点何时发送数据包。对于每一种媒体访问控制技术，用来控制节点发送时机的规则叫做媒体访问规则。局域网上的节点不能想要发送数据就发送，节点只能在轮到它的时候才发送。

仅有STM32自带的MAC还不能做网络通信，还需要外接以太网PHY芯片才可以，如同RS485通信一样，仅有一个串口是不行的，还需要外接RS485的PHY芯片。

PHY（Port Physical Layer），可称之为端口物理层，是一个对OSI模型物理层的简称。现在常用于STM32的有DP83848，LAN8270，DM9161/9162等。这些PHY芯片都大同小异，基本寄存器都是一样的，只有扩展寄存和厂商专门设置的寄存器不同。如果用户将其中一个PHY驱动成功了，驱动另一个也是非常方便的。

如果低端点儿单片机没MAC功能呢？如何外接以太网芯片？办法也是有的，现在有的厂商提供集成的模块儿，自带MAC和PHY芯片的功能，对外通过SPI接口操作访问。如常用的芯片w5500芯片，就是一颗集成了MAC和PHY功能的芯片，通过SPI接口可以访问和使用。SPI接口几乎高低端的单片机都有的常见接口。W5500 芯片是一款集成全硬件 TCP/IP 协议栈的嵌入式以太网控制器，同时也是一颗工业级以太网控制芯片。是韩国WIZnet（微知纳特）发布全硬件TCP/IP协议栈以太网接口芯片。W5500 支持高速标准4线SPI接口与主机进行通信，该 SPI 速率理论上可以达到 80MHz。或者CH395芯片，也是SPI接口连接MCU，它是沁恒公司的一款以太网协议栈管理芯片。CH395 芯片自带10/100M以太网介质传输层（MAC）和物理层(PHY)，完全兼容IEEE802.310/100M 协议，内置了PPPOE、IP、DHCP、ARP、ICMP、IGMP、UDP、TCP 等以太网协议栈固件。

POWERLINK协议源码(最新)在stm32单片机上的移植指南

综上所述，POWERLINK协议栈源码对单片机的要求并不高，一般的单片机都能满足，无论单片机mcu上是否具备MAC接口。协议栈源码也不是很大，不过当然mcu性能越高越好了。

此外对单片机的要求是最好具备嵌入式操作系统如Rtx，rtthread,freeRTOS或ucosII等多任务系统，这样才更容易移植和使用。嵌入式系统最好具备软件定时器功能，方便实现用户层的定时器功能。

还有需要注意，如果单片机是使用的三方库提供的接口操作以太网模块，需要确认下接口是否具备直接操作发送mac帧的能力。因为powerlink的链路层可没有走tcp/ip协议栈，直接操作的mac报文帧。

POWERLINK协议源码(最新)在stm32单片机上的移植指南

mac帧模式介绍

POWERLINK协议源码(最新)在stm32单片机上的移植指南

可以使用wireshark工具抓包，看看发送的mac帧报文是不是正确的。以下举例一包arp协议请求包的完整mac帧格式如下：

//以太网首部（14Byte）

0000: ff ff ff ff ff ff //目的主机为广播地址

0006: 84 c2 e4 f0 08 ef //源主机MAC地址为84-C2-E4-F0-08-EF

000c: 08 06 //上层协议类型0x0806表示ARP或RARP

//ARP请求（28Byte）

000e: 00 01 //硬件类型0x0001表示以太网

0010: 08 00 //协议类型0x0800表示IP协议

0012: 06 04 //MAC地址长度为6； IP地址长度为4

0014: 00 01 // op为0x0001表示请求目的主机的MAC地址

0016: 84 c2 e4 f0 08 ef //源主机MAC地址为00-1C-23-17-4A-CB

001c: c0 a8 01 65 //源主机IP地址（192.168.1.101）

0020: 00 00 00 00 00 00 //目的主机MAC地址未知，全0待填写

0026: c0 a8 01 67 //目的主机的IP地址（192.168.1.103）

//填充数据（18Byte）

002c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

003c: 00 00

或者借助一个抓包工具“科来网络分析系统”来分析发过来的MAC帧。“科来网络分析系统”可以到官方网站（http://www.colasoft.com.cn/download/capsa.php）下载，大家可以选择“技术交流版”进行下载。下载并安装完成后，可以根据提示到他们官方网页注册，接着系统会自动将注册码发送到我们的邮箱中。

POWERLINK协议源码(最新)在stm32单片机上的移植指南

如以下协议类型为0x88AB的为powerlink的mac帧：

POWERLINK协议源码(最新)在stm32单片机上的移植指南

移植指南

以下先给出一个编译过程日志，是POWERLINK协议栈嵌入式linux环境下的编译过程。通过整个编译过程可以看出有哪些文件源码参与了liboplkcn.a协议栈库的生成。（注，从站和主站用的是不同的协议栈库，从站的协议栈库叫liboplkcn.a，主站的是liboplkmn.a）

用倒推法，以结果为导向倒过来推导，就能很清晰的看明白，如果要移植到单片机上，有哪些接口是必须要实现的。

linux下的编译日志

从站协议栈库编译日志

以下为嵌入式linux平台上的编译日志，从站协议栈库liboplkcn.a：

-- CMAKE_SYSTEM_NAME is Linux
-- CMAKE_SYSTEM_PROCESSOR is arm
-- Adding CMAKE configuration options for Linux
-- Configuring oplkcn
-- Configuring done
-- Generating done
-- Build files have been written to: /root/test/powerlink/stack/build/arm-linux
root@hecs-287347:~/test/powerlink/stack/build/arm-linux# make
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编译日志分析

从日志过程看，源码也不多嘛，因此到此处应该增加对移植成功的信心。

接下来分析，跟linux平台相关的源码有哪些？

重要的文件，src/kernel/edrv/edrv-rawsock_linux.c.o

这个是跟底层网络通信相关的核心驱动所在。

接下来的跟linux平台相关的还有：

src/kernel/veth/veth-linuxuser.c.o
src/arch/linux/target-linux.c.o
src/arch/linux/target-mutex.c.o
src/arch/linux/netif-linux.c.o

src/arch/linux/ftracedebug.c.o

src/kernel/event/eventkcal-linux.c.o

src/kernel/timer/hrestimer-posix.c.o

src/user/timer/timer-linuxuser.c.o

src/user/event/eventucal-linux.c.o

src/user/sdo/sdoudp-linux.c.o

就这些啦，看着像是很多？但是这里面其实有几个是不需要的，如sdoudp-linux.c,veth-linuxuser.c，

为何这两个文件不需要移植？先看下openPOWERLINK的代码架构框图：

POWERLINK协议源码(最新)在stm32单片机上的移植指南

图中标注的sdo接口部分似乎走了UDP协议，非得依赖tcp/ip协议栈？如果是使用了UDP那协议栈肯定是少不了了。

单片机上还得移植lwip协议栈？其实不用的，很简单。因为通过查看分析源码可以知道，虽然openPOWERLINK的sdo实现走了udp协议，但是这sdo发送接口是可配置的，它可以不使用udp发送，虽然看到的编译过程日志里有src/user/sdo/sdoudp-linux.c和src/user/sdo/sdoudp.c,但是CONFIG_INCLUDE_SDO_UDP这个配置并未启用。

POWERLINK协议源码(最新)在stm32单片机上的移植指南

sdoasnd.c，SDO over ASnd protocol，未配置CONFIG_INCLUDE_SDO_UDP，这样不走udp协议，则不需要非得有tcp/ip协议栈（当然单片机有tcp/ip协议栈也行，不影响）。

src/kernel/veth/veth-linuxuser.c这个文件虽然编译日志里有它，但是实际也未用到。因为未启用CONFIG_INCLUDE_VETH这个宏定义。因此src/kernel/veth这个文件夹下的也可以略过。

最后剩下的涉及改动的文件，只有：

src/kernel/edrv/edrv-rawsock_linux.c.o

src/arch/linux/target-linux.c.o
src/arch/linux/target-mutex.c.o
src/arch/linux/netif-linux.c.o

src/arch/linux/ftracedebug.c.o

src/kernel/event/eventkcal-linux.c.o

src/kernel/timer/hrestimer-posix.c

src/user/timer/timer-linuxuser.c.o

src/user/event/eventucal-linux.c.o

再检查下看看还有没涉及到，发现还有个文件src/common/circbuf/circbuf-posixshm.c

它是个关于环形缓冲区的实现，这个好像依赖了posix规范。如果单片机环境中不具备的话，这个也好办，到src/common/circbuf下看看，有没有其他的实现，直接找一个拿来用就行啦。

其他的类似，如果不知道如何移植，可参照对应文件夹下的其他平台的实现照猫画虎，依葫芦画瓢，相信肯定都能搞定。

最后的最后，把以上涉及到的文件，单独摘出来到单片机里用吧，有了从站库，至于应用开发，就是调用接口而已，就这么简单。

重要移植文件分析

主要的需要移植的文件有：

src/kernel/edrv/edrv-rawsock_linux.c //链路层网络帧通信

src/kernel/timer/hrestimer-posix.c // 高精度定时器的实现

src/user/timer/timer-linuxuser.c //用户层定时器

src/user/event/eventucal-linux.c //事件机制的实现

搞定了以上四个，基本上就离成功不远了。

高精度定时器和timer-linuxuser.c实现可参考hrestimer-i210.c文件，这个里面是用了回调，不用参考linux那里面的信号传递给线程的方式。如果使用的用嵌入式系统，则也很好移植这部分。比如使用keil的rtx内核系统提供的定时器操作函数，则也容易实现。

eventucal-linux.c //事件机制的实现，本身代码量不多，使用嵌入式内核的信号量机制可以实现。

那么最后仅剩edrv-rawsock_linux.c，调试网络接口了。

最后的最后，把apps/目录里的demo_cn_console测试demo在单片机上试着看能否跑起来，验证下是否成功。

涉及的移植文件：

POWERLINK协议源码(最新)在stm32单片机上的移植指南

代码占用情况分析：(包含powerlink源码+RTX嵌入式系统内核在内）

RAM占用：RW-data+ZI-data ， 4204+53892 ，58K左右

ROM占用：Code+Ro-data+Rw-data,80k左右

附：

主站协议栈库编译日志

主站协议栈库（liboplkmn.a）的编译日志，如果需要移植主站协议栈库可以参考。

-- CMAKE_SYSTEM_NAME is Linux
-- CMAKE_SYSTEM_PROCESSOR is arm
-- Adding CMAKE configuration options for Linux
-- Configuring oplkmn
-- Configuring done
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-- Build files have been written to: /root/test/powerlink/stack/build/arm-linux
root@hecs-287347:~/test/powerlink/stack/build/arm-linux# make
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Windows下的编译日志

顺便也给出windows下的从站和主站协议栈库的编译日志，可以相互对比下差异。

Windows下的从站库日志：

====================[ Build | oplkcn | Debug ]==================================
"D:\Program Files\JetBrains\CLion 2021.3.3\bin\cmake\win\bin\cmake.exe" --build E:\test\cpp\openPOWERLINK_V2.7.2\stack\cmake-build-debug --target oplkcn
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