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RTOS/TM4C1294NCPDT: TCP/IP over GPRS Modem connected to UART

Leandro Martins
Intellectual 420 points
Part Number: TM4C1294NCPDT

Tool/software: TI-RTOS

Hello,

  I am developing an application in TM4C1294NCPDT processor and using TI-RTOS 2_16_01_14 with NDK 2_25_00_09. I have already implemented my network connection using the Ethernet interface and it is working fine. Now I have a GPRS Modem connected to an UART port and I am communicating with it using AT commands. The Modem has an internal TCP/IP stack but of course I need to use AT commands to connect, disconnect and control the connection. Iwould like to use the same code (I mean, sockets) I have written to communicate over GPRS (In that case, UART). I have noticed that I need to use PPP interface available in NDK but I don't know how to put it to work together with my UART.

  What I need is, once I am attached and connected to the GPRS network, I want to open a socket with my server and send/receive packets, transparently, even I am using ethernet or gprs.

  Any advice?

  Tks in advance

  • 0
    TI__Guru* 96960 points
    Hi Leandro,

    You want to have your application still call the NDK socket calls, but instead of going out the EMAC, have it go to the UART to the GPRS network...correct?

    I don't believe we have an existing NIMU that does this. Just the EMAC and PPP ones. I need to check with another engineer to confirm this. A NIMU (network interface management unit) driver is a driver that fits under the NDK to interface to the hardware. You can get details on how to write a NIMU driver here: www.ti.com/.../sprufp2b.pdf (also in the TI-RTOS for TivaC product).

    Todd
  • 0 in reply to ToddMullanix
    Intellectual 420 points
    Hi Todd,

    Thanks for answer. Exact, I would like to continue using all my sockets transparently and the NIMU instead of going to EMAC, would go to UART and call AT commands.
    I will check the documentation and see how difficult is to create a NIMU driver and maybe, because of deadlines, I will need to write the first version of my code using the modem tcpip stack and, later (but not too much), I will write the NIMU driver.

    Best regards,
    Leandro
  • 0 in reply to Leandro Martins
    TI__Guru* 96960 points
    Sounds good. Fyi...I checked with one of the NDK engineers and he agreed with my suggestion.

    Regarding writing your own NIMU driver...it's usually easier to use an existing one as a template and then change accordingly.

    Todd
  • 0 in reply to ToddMullanix
    Intellectual 420 points
    Tks for your attention Todd.

    Best regards.