39.1. tsn_credit_based_shaper

39.1.1. 概述

本示例展示了TSN CBS(IEEE802.1 Qav)流量整形输出

• 观察相同流分别从启用和不启用CBS整形的队列输出后的帧间隔差异 未启用CBS的队列输出流不受带宽限制从而具有较小的帧间隔，启用CBS的队列输出流所占带宽受限从而具有较大的帧间隔

39.1.2. 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PC以太网端口和开发板RGMIII端口

39.1.3. 工程配置

• 无

39.1.4. 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: Credit Based Shaper
  TSW phy init passed !
  Link Status: Down
  Link Status: Up
  Link Speed:  1000Mbps
  Link Duplex: Full duplex
  tc: 0 - cbs enabled
  tc: 0 - utag: 1 - tts(s): 4.005782360 - frame interval(ns): 1790
  tc: 0 - utag: 1 - tts(s): 4.005783900 - frame interval(ns): 1540
  tc: 0 - utag: 1 - tts(s): 4.005785430 - frame interval(ns): 1530
  tc: 0 - utag: 1 - tts(s): 4.005786970 - frame interval(ns): 1540
  tc: 0 - utag: 1 - tts(s): 4.005788500 - frame interval(ns): 1530
  tc: 0 - utag: 1 - tts(s): 4.005790040 - frame interval(ns): 1540
  tc: 0 - utag: 1 - tts(s): 4.005791580 - frame interval(ns): 1540
  tc: 0 - utag: 1 - tts(s): 4.005793110 - frame interval(ns): 1530
  tc: 0 - utag: 1 - tts(s): 4.005794650 - frame interval(ns): 1540
  
  tc: 1 - cbs disabled
  tc: 1 - utag: 2 - tts(s): 4.015788850 - frame interval(ns): 760
  tc: 1 - utag: 2 - tts(s): 4.015789610 - frame interval(ns): 760
  tc: 1 - utag: 2 - tts(s): 4.015790370 - frame interval(ns): 760
  tc: 1 - utag: 2 - tts(s): 4.015791130 - frame interval(ns): 760
  tc: 1 - utag: 2 - tts(s): 4.015791890 - frame interval(ns): 760
  tc: 1 - utag: 2 - tts(s): 4.015792650 - frame interval(ns): 760
  tc: 1 - utag: 2 - tts(s): 4.015793410 - frame interval(ns): 760
  tc: 1 - utag: 2 - tts(s): 4.015794170 - frame interval(ns): 760
  tc: 1 - utag: 2 - tts(s): 4.015794930 - frame interval(ns): 760