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Thread: Teensy 3.* - Text rendering issue with RA8875 TFT display

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  1. #1
    Junior Member
    Join Date
    Dec 2013

    Teensy 3.* - Text rendering issue with RA8875 TFT display


    I am a really big fan of the Teensy family and have been using the Teensy 2, 2++ for quite a while now. I recently bought a pair of Teensy 3.1s and am amazed at the speed and power of these tiny boards.

    I have a 5" TFT touch display from Adafruit (, controlled through SPI by an RA8875 driver board (, programmed using their library ( On an Arduino Uno and a Teensy 2, everything works just as expected. I tried running the same program on a Teensy 3.1 and everything works fine, except that the text rendering is screwed up. Rendered text shows up as a jumble (not even real characters). I get this issue both with my custom program and the library's example program. I feel this might have to do with the Teensy 3.1 having a 32-bit processor.

    Expected (w/ Arduino Uno):
    Click image for larger version. 

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    Bad Rendering (w/ Teensy 3.1):
    Click image for larger version. 

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    Thanks in advance!
    Last edited by slgonzalez; 12-16-2013 at 01:54 AM.

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