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Type: Posts; User: PaulStoffregen

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    Another gotcha is PSWITCH. It will not work if...

    Another gotcha is PSWITCH. It will not work if simply wired to 3.3V. NXP's documentation about this quite misleading. It's not a simple active-high enable. A low to high transition is required...
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    Maybe not the answers you wanted, but hopefully...

    Maybe not the answers you wanted, but hopefully this gives you the info you need to get started, rather then wasting a lot of time on reverse engineering.
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    SWD absolutely will not work. All Teensy 4.1...

    SWD absolutely will not work. All Teensy 4.1 boards are permanently fuse configured for JTAG. NXP did not implement dynamic switch between SWD & JTAG as ARM's documentation says. It will only talk...
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    If you play with JTAG boundary scan, the IMXRT...

    If you play with JTAG boundary scan, the IMXRT chips have an undocumented bug were weird/wrong things happen if you stay in the various scan states for more than about 8 seconds. Parking in the...
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    If you do attempt this, here are the signal...

    If you do attempt this, here are the signal locations you'll need.

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    BOOT0 needs to be connected to GND for normal operation.

    PSWITCH needs a low-to-high transition to turn on the 1.15V...
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    Teensy 4.1 uses JTAG, not SWD. It would in...

    Teensy 4.1 uses JTAG, not SWD. It would in theory be done if you solder more wires and use a JTAG adaptor. Just know that SWD can not work.
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    Teensy 4.0 & 4.1 schematics haven't been updated...

    Teensy 4.0 & 4.1 schematics haven't been updated for the U2 chip substitution. Realistically, they probably won't ever get updated. This U2 part is meant to be a temporary change until the original...
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