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tm4c129 LCD

patrick murphy
Intellectual 640 points


Hello,

     I  was researching the use of the tm4c129 LCD control module to control a small TFT transmissive display. As this is outside my experience with micrcontrollers I was considering getting the DK-TM4C129X kit as a learning tool. 

the driver on the dislpay is the R61505V

Also, is the prospect of removing the LCD that is supplied with the kit and replacing it with my own LCD worthy of consideration.

any opinions on this ?   good fit or not ?

  • 0
    TI__Guru**** 244400 points
    Hello Patrick

    What type of LCD Display are you planning to use: LIDD or Raster, how many BPP?

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Guru 47900 points

    Note too that there are newer - and higher contrast TFTs - which employ even more modern (and efficient) interfaces.

    Should not it be asked if the specified display kit proves (best) for your intended application?    How widespread has been your search/investigation?

    The display most often proves critical to product success. (it provides the "window to the soul" of your product.) Your admittance of that fact may trump the desire to "force a display to conform to TM4C129" - and instead choose a controller which best mates/matches the more modern, higher contrast, reduced interface displays...

  • 0 in reply to cb1
    Intellectual 640 points

    what are some of these newer displays? I am constrained by size and shape. It needs to be round.

  • 0 in reply to patrick murphy
    Guru 117855 points

    Re: "It (display) needs to be round"

    The inclusion of that fact (initially) would have proved helpful.    If you've found a suitable (and round) display - your investigative skills should enable your discovery of the newest class of, "Reduced interface, increased pixel, higher-contrast" TFTs...

  • 0 in reply to patrick murphy
    TI__Guru**** 244400 points
    Hello Patrick,

    Instead of removing the panel, it would be simpler to remove the headers on the left of the panel and interface your LCD panel.

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Intellectual 640 points

    Thanks for the reply amit.

    The question I have is how would I go about finding a TFT display that will inteface 'easily' with the tm4c129?

    what to look for in the display specs? does the MIPI standard mean anything relative to the 129?

    Thanks

    Pat

  • 0 in reply to patrick murphy
    Guru 117855 points

    patrick murphy said:
    Does the MIPI standard mean anything relative to the 129?

    That's doubtful - vendor here should confirm.

    Your discovery & report of "MIPI" suggests that you've identified the (advantaged) "MIPI DSI Interface" class of new displays.   Higher contrast, wider viewing angles, more color saturation, reduced interface - all under the MIPI DSI classification - would argue for its selection.

    Finding a non-custom, "round" display - with an adequate pixel-field - should prove a great challenge.   Can you not procure (say, a 4" - 800x480 pixel - MIPI DSI display) and position it behind a 4" circular, panel opening?

    Most here would benefit from, "thinking cell-phone and tablets" - roundness has not (yet) become entrenched in those extreme volume, high performance, cost-driven markets...

  • 0 in reply to cb1_mobile
    Intellectual 640 points
    That's a good suggestion but I'm afraid I cant mount a square device behind a round opening. I will have to keep searching I suppose. I had hoped that the MIPI standard might be helpful but it doesn't look that way, yet. I'm sure that when TI designed up the LCD control section of the 129 chip that they had a family or type of LCD in mind. Too bad they aren't more forthcoming on what displays would make a good fit with their interface.
  • 0 in reply to patrick murphy
    Guru 47900 points
    There are some instrument makers who have developed custom, round displays. While unlikely to provide an exact match to your need - you can at least satisfy your "round" requirement. These round displays may serve as your, "Proof of concept."

    Sometimes - but not always - my small tech firm has been able to purchase "excess" from such firms - but only after insuring the seller that we were - in no way - (any) threat to compete.

    The display type you've identified is (most likely) the "wave of the future." Properly matching such displays to suitable MCU/Controllers makes great sense...
  • 0 in reply to patrick murphy
    TI__Guru**** 244400 points
    Hello Patrick,

    The MIPI standard is not supported on the TM4C129x device. There are however Parallel port to MIPI converted available on TI website.

    From an interface persepctive of TFT panels, besides the LIDD mode, I have used a RGB24 panel from Optrex T-55226D043J-LW-A-AAN

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Guru 117855 points

    Hi Amit,

    Let the record show:

    • Optrex is no more!   (swallowed by competitor Kyocera)
    • T-55226D and kin are (unlikely) to be round

  • 0
    Guru 117855 points

    While the 4" - 800x480 pixel - MIPI DSI Interfaced display I earlier mentioned is NOT round (it is rectangular - not square) unless your requirement is for (everything) to fit w/in a 4" diameter cylinder - that display should work! (rectangular displays are often "hidden" behind circular dials in numerous instruments!)

    If your requirement is to fit w/in a 4" cylinder - that demand should have (also) been included - initial post. And - being long in the display biz - that pot of gold (round display) hides behind a very thin (and wispy) rainbow...

  • 0 in reply to cb1_mobile
    TI__Guru**** 244400 points
    Hello cb1

    Yes, Kyocera now re-brands it and sells it.

    Regards
    Amit
  • 0 in reply to cb1
    Intellectual 640 points
    got a line on a display that has a " MIPI single lane interface" where might I find more info on this as it relates to the TM4C129 LCD controller?
    It has two pins for data and two pins for clock. Labeled P and N on each.
    RM67160 is the driver IC
  • 0 in reply to patrick murphy
    Guru 117855 points

    Has that "line" included the display maker & part number?   (such would be useful - "line" (alone) not so much)

    Amit's confirmed that 129 does not provide native support for this newer TFT interface standard.   He did mention that an (extra) converter board (or chip) may enable you to massage out the needed signals.

    As we've invested time/effort here in your behalf - might you divulge maker & part number of your newly discovered display?   That's the best means for (anyone) here to provide competent analysis & commentary...   (and we are betting that it is NOT round!)