Aaron Christophel | Cheapest SWD Programmer, CH552 DAP nRF52 flashing @atc1441 | Uploaded July 2020 | Updated October 2024, 12 hours ago.
This videos shows a preview of the CH552 as an SWD DAP Programmer

This opens up the possibility to flash Many Smartwatches with an nRF51 or nRF52 and of course man more Micro-controller.

The most interesting part with this is the price, the CH552 starts at about 20 cents
so it will most likely be not more than 50 cents for all the parts, including the pcb.


This is perfectly usable for the ATCwatch project:
youtube.com/watch?v=4aFDjymXjOw

github.com/atc1441/ATCwatch


DAP CH552 SourceCode including Arduino Board:
github.com/atc1441/ch55xduino-1/blob/ch55xduino/ch55xduino/ch55x/libraries/Generic_Examples/examples/05.USB/CMSIS_DAP/CMSIS_DAP.ino