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Thread: How to set T3.6 clock speed higher than 240?

  1. #1
    Senior Member
    Join Date
    Jan 2014
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    How to set T3.6 clock speed higher than 240?

    I am driving led panels with SmartMatrix and Teensy 3.6.
    I run at 240 MHz oversample.

    With 64 x 64 panels, it works flawlessly.
    With 128 by 64 I get crashes between 1 and 10 minutes.

    I suspect it may be the Clock/DMA rate needs to be boosted.

    I saw some discussion of overclocking even higher than 240 Mhz.

    Can anyone direct me specifically to the values I need to change to try this > 240 Hz overclocking?

    Thanks,

    Richard

  2. #2
    Senior Member+ defragster's Avatar
    Join Date
    Feb 2015
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    8,802
    In your TeensyDuino installed boards.txt there are two commented lines.

    Close the IDE - edit these two lines and open and there will be a new menu option for speed:
    Code:
    teensy36.menu.speed.256=256 MHz (overclock)
    teensy36.menu.speed.256.build.fcpu=256000000

  3. #3
    Senior Member
    Join Date
    Jan 2014
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    152
    Brilliant. Thanks.

  4. #4
    Senior Member+ defragster's Avatar
    Join Date
    Feb 2015
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    8,802
    The Brilliance comes from FrankB ... I just remember how to enable it

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