Protecting input/output buffers of CH552

tillitis / tillitis-key1

Board designs, FPGA verilog, firmware for TKey, the flexible and open USB security key 🔑

https://www.tillitis.se

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Closed dehanj closed 7 months ago

dehanj commented 7 months ago

This is a fix for the issue that CH552 during certain circumstances can drop a bytes from UART -> USB. Some other changes:

Implemented simple GPIO usage, for debugging. Left it in for future use but uninitialized.
Translated all comments (hence why the PR looks so messy).
Left comments at locations I see potential issues with, as a reminder for the future.