32bit Teensy's SWD-debug



The 32 Bit Teensy Boards from PJRC are "a complete USB-based microcontroller development system, in a very small footprint, capable of implementing many types of projects".
   However, not everyone can make friends with the HalfKay Bootloader + Teensy Loader - that's how I felt. I like a classic debug interface like JTAG / SWD to load & debug the firmware.
   And so I went on a reconnaissance trip to get back to the SWD-debug interface. In addition to wild attempts, I found a solution that works well on all 32-bit Teensy boards with Kinetis KL02Z, which acts as an onboard interface and bootloader, without having to completely remove them.
   The special note: the Kinetis KL02Z can be completely deactivated by applying GND on PTA1 / pin 15 (QFN16) - KL02Z reset pin the /RESET-pin of the KL02Z.
   Then only the ports required for the SWD-debug interface have to be tapped.




Teensy LCTeensy 3.2Teensy 3.5 / 3.6



















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KL02Z.. reset pin


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Teensy LC - SWD adoption


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Teensy 3.2 - SWD adoption


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Teensy 3.6 - SWD adoption


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Teensy LC with SWD-connector


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Teensy 3.2 with SWD-connector


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Teensy 3.6 with SWD-connector