ST_Link_V2.1

## ***ST_Link_V2.1***

## ***Introduction***
### A downloader with compact size and full functions.

## ***Function***
### 1. Support regular SWD interface download.
### 2. Support virtual USB disk for drag and drop download.
### 3. Support virtual serial port.
### 4. Support hardware reset and connect an external button.
### 5. Lead out 3.3V and 5V power supplies to provide power to the outside world.

## ***Physical Verification***
![1one.jpg] ![Five.jpg]
## ***Version***
|Version|Time|Function|State|
|---|--- |---|---|
|V1.1|23.3.25|Improved version|Unverified|
|V1.0|23.3.15|Initial version|Success|

### **V1.0**
## # Full verification successful.

### **V1.1**
### a. Modify the power supply chip to make it easier to obtain and improve the external power supply capability.
### b. Modify some silk screen positions and wiring.
### c. This version does not actually make the board, but only modifies the wiring. You can decide whether to make the board yourself.

## ***Panel***
### In order to be more beautiful, and also to try out the panel printing of Jialichuang, I made the corresponding panel.

## ***Adapter board***
### For better wiring, I drew the corresponding adapter board and bought it for free for 0 yuan.

## ***Notes***
### 1. For the convenience of drawing, the resistors and capacitors are in the same package. The resistors and capacitors on the exported BOM shall be subject to the actual markings.
### 2. The layout of components is very compact, and soldering is difficult. When drawing, I planned to use SMT.

## ***Summary***
### 1. The board processing cost is high, and hand welding is difficult, but the size is really small.
### 2. The connection holes between the motherboard, panel, and adapter board are easy to get soldered during soldering. Then screw it in and it will be a little crooked.
### 3. Each fixed size was not fully considered in the early stage and will not affect the use, but you will need to re-purchase the connecting parts. The initial design was to make a complete product, and a full set of materials, outer packaging, copper pillars, terminals, and connections were purchased, so the overall cost was quite high.
### 4. The first design of the panel was not very good.

## Successful, but the cost is quite high.