QsgWK

USB 2.0 expansion dock (3USB + 2UART + 1*STlink)

Overview

First, I would like to thank engineer Chen Zhe for his STlink open-source project:
https://oshwhub.com/CYIIOT/ST_LINK-V2_1.
This project uses two ICs:
1. FE2.1 (USB 1-to-7 expansion chip)
2. STM32F103CBT6 (I personally tested that the C8T6's memory is too small, and the firmware cannot be burned).
The functions are as follows:
1. Two * USB 2.0 + USB 2.54 interfaces (used for direct USB debugging with DuPont wires)
2. Two * UARTs (sometimes two serial ports are used to control two microcontrollers respectively)
3. STlink programming interface (only SWDIO and SWCLK)
. All components are surface-mount components. This allows for a direct setup using a heating platform, and also provides stability and a more comfortable viewing experience when placed on a table.
The pin order for burning firmware from top to bottom is (3V3, SWCLK, SWDIO, GND).

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Update:2026-03-23 22:05:36

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USB 2.0 expansion dock (3*USB + 2*UART + 1*STlink)

USB 2.0 expansion dock (3USB + 2UART + 1*STlink)