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CH340C Programmer

Overview

Tested and confirmed to work with STM32, STC51, Arduino, and ESP32 development boards, with one-click automatic download.
PS: Not yet tested because I don't have a GD32. The two resistors on the CC pin of the Type-C port don't need to be soldered.
In practice, the CH340C chip's built-in 3V3V is sufficient for downloading; no additional LDO power supply is needed (a 100nF decoupling capacitor is recommended).
With the shorting cap on the left, it's 5V; with the cap on the right, it's 3.3V.
Version 0.9 has issues; leaving this as a warning to myself.

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-27 23:10:12

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