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...
Type: Posts; User: PaulStoffregen
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...
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.
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...
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...
If you do attempt this, here are the signal locations you'll need.
29461
BOOT0 needs to be connected to GND for normal operation.
PSWITCH needs a low-to-high transition to turn on the 1.15V...
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.
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...