STM32F105 Limitation

Bummer – just received my USB/CAN adapter PCB’s and realized that they are wasted. Soldered one up, but as I intended to activate USB I realized 2 things: (1) HSI can only be clocked up to 36Mhz and (2) USB will only work with HSE (External Crystal).

I have these small Murrata ceramic Crystals that take no space, so not sure why I did not just added them. I obviously need to order new PCB’s, but I have other dev cards I can use for USB testing. This error could have been avoided if I had checked with CubeMX first.

The New SWD port with micro JST works fine. I am just using a cable to the old adapter.

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