41.4. tsn_frame_preemption_ingress

41.4.1. 概述

本示例展示了TSN 帧抢占(IEEE802.1 Qbu)输出

• 观察可抢占流与快速流发送后，MMS的fragment tx count的计数值

  • 递增表示成功发送了可抢占流

• 在接收端，需要另外一块开发板运行tsn_frame_preemption_egress, 观察数据帧的接收顺序以及assembly ok count的计数值

41.4.2. 硬件设置

• 使用USB Type-C线缆连接PC USB端口和PWR DEBUG端口

• 使用以太网线缆连接两块开发板的RGMIII端口

41.4.3. 工程配置

• 无

41.4.4. 运行示例

• 编译下载程序

• 串口终端显示如下信息：

  This is a TSW demo: Frame Preemption Ingress
  TSW phy init passed !
  Link Status: Down
  Link Status: Up
  Link Speed:  1000Mbps
  Link Duplex: Full duplex
  tc: 1 - utag: 2 - tts(s): 842.005733760 - frame interval(ns): 0
  tc: 0 - utag: 1 - tts(s): 842.005735630 - frame interval(ns): 1870
  FPE MMS Fragment Tx Counter: 1
  ==================================================================
  tc: 1 - utag: 2 - tts(s): 842.526724320 - frame interval(ns): 0
  tc: 0 - utag: 1 - tts(s): 842.526726000 - frame interval(ns): 1680
  FPE MMS Fragment Tx Counter: 2
  ==================================================================
  tc: 1 - utag: 2 - tts(s): 843.047703500 - frame interval(ns): 0
  tc: 0 - utag: 1 - tts(s): 843.047705180 - frame interval(ns): 1680
  FPE MMS Fragment Tx Counter: 3
  ==================================================================