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Thread: ILI9431 8bit parallel

  1. #1
    Senior Member
    Join Date
    Jul 2014

    ILI9431 8bit parallel

    I know, this may not be relevant for most of us, but I wanted to report it anyhow for the records.

    I needed something from local Conrad store (in DEU) and in order to justify the trip to town I took a
    "Touchscreen für Arduino Uno/Mega" from Tru Components to see if I can use it for Teensy.
    After some search I found that it more or less identical to Vellemann VMA412 with more information.
    The short version:
    Even if powered with 5 V (on standard Uno/Mega pins) it works internally with 3.3 V, so connecting to Teensy 3.6 was not a problem.
    Using SW from I got it working but only with CPU speed of up to 48 MHz
    Using standard Touchscreen was working too, whereby using rxplate =0 removed final issue with pressure readings

    I'm not saying that this SW is perfect, but it is a good starting point and improvements are possible.

    Finally, if you have a SPI version of the display, forget about what I said above.

  2. #2
    Senior Member
    Join Date
    Oct 2019
    I have an ILI9488 display driver written by another forum member (@beermat) that supports 8/16 bit wide bus on a Teensy 4.1
    It could be modified to support the 9341 as well I guess - and supports much faster CPU speeds.

    But with the Teensy Micromod, and 8+ consecutive FlexIO pins available, a much more advanced library can be created to support fast, non blocking (dma) screen updates for those after a much higher full screen refresh rate than what is available over SPI today

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