QFP48 Burning Socket Test Stand

For small gadgets like the QMK keyboard, which require a bootloader to be flashed via SWD or TTL before they can function properly, and sometimes flashing firmware is too cumbersome,
please use the onboard ST-LINK version.
 
The firmware of ST-LINK V2.1 V2.J37.M26 (latest version) is tested and tested for the requirements of burning QMK firmware:
STM32F103C8/BT6 is normal and usable;
APM32F103CBT6 is normal and usable (Geehy and APEXMIC are both usable), but QMK will crash under certain circumstances with APM32F103CBT6;
HK32F103CBT6 can burn firmware but QMK is not usable;
FCM32F103CBT6 is normal and usable but not tested in detail;
CKS32F103CBT6 is normal and usable but not tested in detail;
 
Briefly explain the functions;
The two switches in the upper right corner are used to set the status of BOOT0 and BOOT1. If BOOT0 is set to up (1), the firmware can be burned through the TTL interface via the virtual serial port of ST-LINK, for example, through software such as Demostrator GUI;
Generally, when burning via SWD, BOOT0 and BOOT1 are pulled down (0).
 
The USB port on the left is for the chip being programmed. It has a 22R pull-up resistor and a 1.5K pull-up resistor, allowing for direct testing of the QMK bootloader after programming.
 
The programming socket can be purchased on Taobao for approximately 50 RMB; model number QFP-48-0.5.