TM4C129XNCZAD: TCP/IP connection problem with two interfaces (Ethernet & PPP over USB)

Mohamed Bastawy

Part Number: TM4C129XNCZAD

- Using the two examples "tcpEcho" & "tcpEchoPPP" as a guide with DK_TM4C129X KIT.

- Both Ethernet(Interface 1) & PPP over USB(Interface 2) are initialized and get different IPs.

- using tool "tcpSendReceive.exe"(Windows 7 64bits) sends packets over Ethernet successfully; but failed with PPP over USB (TCP/IP packets already received with NDK and passed to the TCP dispatcher "TcpInput()").

- Sending packets over PPP interface succeed if Ethernet not initialized (Remove "EMACSnow_NIMUInit" from "NIMUDeviceTable" in "DK_TM4C129X.c").

over 8 years ago

0 Ralph Jacobi over 8 years ago

TI__Guru*** 135355 points

Hello Mohamed,

Regarding point of tcpSendReceive.exe failing with PPP over USB, please see this post which states that the PPP example is meant for Linux and not Windows: e2e.ti.com/.../2153009

0 Mohamed Bastawy over 8 years ago in reply to Ralph Jacobi

Prodigy 30 points

Thanks for replying , Ralph
- But I've already modified the PPP example to work with Windows OS , and I succeed to echo from Windows 7.
- PPP works well alone , but not working if Ethernet interface is working.

tcpEcho_ETH_PPPUSB.zip

0 ToddMullanix over 8 years ago in reply to Mohamed Bastawy

TI__Guru* 96960 points

Does the target receive anything on the PPP connection? What happens if you have both configured, but only do the PPP test?

Have you looked at Tools->ROV->BIOS->Scan for Errors to see if you have any stack overflows, exceptions, etc.?

Sorry, I'm not familiar with PPP...what do you have to setup on the Window box to do the PPP test?

Todd

0 Mohamed Bastawy over 8 years ago in reply to ToddMullanix

Prodigy 30 points

Hi ToddMullanix,

- When PPP interface only is running (No Ethernet cable is plugged yet), Packet can be sent/Received by PC & the Kit normally.

- When Ethernet cable is plugged and the interface gets IP, the PPP interface stops working (Receive TCP/IP packets but can't dispatch them)(I think LCP packets still sent & received normally).

- No ROV stack overflows, exceptions,etc ...

- You can use "Packet Sender" tool for testing (assigned IPs displayed on CCS console and the Ports are 1000 for the first IP assigned and 1001 for the second one). (https://packetsender.com/)

- The attached file explains how to create a PPP server connection on Windows 7.

Installing and configuring a Server PPP null-modem connection on Windows 7.doc

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TM4C129XNCZAD: TCP/IP connection problem with two interfaces (Ethernet & PPP over USB)