I’ve created a custom board using the Pro Micro eagle designs. After soldering the 32u4 get’s programmed with ease using a USBasp (Leonardo). But after nothing, powering the board does, well nothing…
My mind is towards the crystal setup. When uploading/programming, do you use the crystal?
If so the crystal must be fine, i’m clueless. Any thoughts?
If not, what are the steps to check the crystal and how to continue?
I’m using a “Xtl,SMD,5032,16.000MHz,18pF,20ppm” from RS-online with 22pf capacitors and wired as a pro-micro. The capacitors connect trough a general ground plane, that is not ideal i’d guess?
There is no usb port available on the pcb.
Attached a verbose log and part of the schematic. Thanks for any pointers.
programming.txt (3.76 KB)