STLink V2.1/DAPLink with DC-DC power supply

If you think the ST-Link V2.1 on the Nucleo board is inconvenient to use, you can transfer the ST-Link V2.1 part to the PCB of this project, so you get a ST-Link V2.1 with a USB-C interface.
 
Because DAPLink and ST-Link V2.1 use the same pin definition, this project can also be used as DAPLink.
 
It has a red and green dual-color indicator light, and the serial port has an independent indicator light, so the firmware in the attachment disables the indicator light flashing function when serial port data is sent and received.
 
The reset button is connected to the reset output of SWD, so when the target board being debugged does not have a reset button but leads to the reset pin, this button can be used to reset. In addition, when you need to upgrade the DAPLink firmware, press and hold this button to power on and start from the Bootloader.
 
This project uses DC-DC power supply, and the 3.3V output can provide a larger current.
 
The MCO function led out on the side is an 8MHz clock signal output, and the clock source is an 8MHz crystal oscillator. When debugging a target board without a crystal oscillator, connecting MCO to the clock input pin of the target board can provide a relatively accurate clock source.
 
The SWO function has not been tested yet.
 
This project uses 0603 packaged resistors and capacitors, which is more conducive to beginners practicing welding.