The ItsyBitsy has pins SWDIO and SWCLK broken out on the back edge of the board. You'll need a SWD cable breakout to connect the J-Link to an ItsyBitsy:
This adapter board is designed to make it easier to use ARM dev boards that use slimmer 2x5 (0.05"/1.27mm pitch) SWD cables for programming. It's helpful for using...
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Make the following connections between the ItsyBitsy M0/M4 and the SWD Cable Breakout:
- ItsyBitsy GND to Breakout GND
- ItsyBitsy 3V to Breakout VRef
- ItsyBitsy SWCLK to Breakout CLK
- ItsyBitsy SWDIO to Breakout SWIO
You must also plug in a USB cable to the ItsyBitsy to power it during progamming
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