• Author Author: neerajrd82
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UDP STACK-- DATA PAYLOAD OF NMEA SENTENCE---EK-TM4C1294XL KIT--- SERIAL TO ETHERNET CONVERSION.

neerajrd82

This demonstration shows serial to ethernet conversion. EK-TM4C1294XL KIT (Tiva C launchpad kit) is connected with PC using USB cable. This connections enables onboard debugger & creates Virtual com port on configuring the windows drivers on PC. Docklight software is configured according to settings of serial port inside target Microcontroller. Dummy 20-byte NMEA sentence is configured in docklight to generate serial packet which goes inside target Microcontroller. Now , target Microcontroller captures this packet & puts the same into data payload of UDP stack. Now UDP packet is shown on Wireshark. When target Microcontroller receives valid header , it also responds to ping request otherwise no response on ping. This is done deliberately for debugging. Please! see the video below:

https://www.youtube.com/watch?v=HUEtP5I9uQw

This was roadtest done on EK-TM4C1294XL KIT (Tiva C launchpad kit) sponsored by Texas instruments in 2015. 

I m promoter of "MADE IN INDIA" instead of "MAKE IN INDIA". Reason: "MADE IN INDIA" means "DESIGN & MANUFACTURED IN INDIA" otherwise "MAKE IN INDIA" means "DESIGN SOMEWHERE ELSE BUT MANUFACTURED IN INDIA".

Good comments & suggestions are always welcome.    

  • in reply to shabaz

    Dear Shabaz, i will implement this as suggested by you. Again Good comments & suggestions are always welcome

  • Not that it matters after so many years, but because it's interesting to spot bugs, and since you've posted it:

    There's a bit of a bug in the solution. You're sending 18 bytes:

    image

    However, the UDP packets contain 20 bytes:

    image

    The problem is, the stream has no delimiter, perhaps you're using CR/LF to do that, but that's no good if the serial stream carried anything other than NMEA.

    There's actually standards to do what you're doing, dating back to serial modern days. Something like SLIP would do it (easy for a microcontroller to decipher that). Plenty of other methods too, that's just one of the simplest, and would solve that problem.