A02_Reproduction SnailCard_v3s

1 Original author of the project: https://oshwhub.com/ftwtwzy/snaillpi_copy. Thank you for sharing. The system image is also provided in the original work.
2 I found this to be a very interesting small Linux computer. I copied it and learned Linux-related knowledge at the same time.
3. Slightly modified the schematic diagram and replaced the accessories on hand, such as MicroUSB interface, CH340 chip, and added a wired network interface. The function has not been confirmed yet. The board has become larger. Please note that the original shell cannot be used.
4. The WIFI module is not soldered for the time being and will be supplemented later. Chip welding is prone to false soldering, and it is difficult to tin the ground pad. Problems that arise during the re-engraving process are basically welding problems.
5. Before welding the main chip, check whether the power supply system voltage is normal and whether the serial port communication is normal. After confirmation, proceed with subsequent welding.
6. There is no problem with the main control chip welding, and the system can be entered normally. If an error is found in the system, focus on checking the soldering conditions of each PIN of the main chip. Most of them are affected by virtual soldering.
7 discovered functions: equipped with mplayer player for listening to songs (command: mplayer -slave -quiet xxx.mp3, adjusting volume: volume 50 1) or playing videos; supports NES game emulator (key modification: ~/packet /arm-NES-linux-master/linux/joypad_input.cpp, just recompile); supports U disk (mounted using mount command), USB keyboard device (as a small screen input device and also a game input device); comes with The GCC compiler can directly compile the code and run it; the WIFI network (run the network script before use) has other functions waiting for everyone to discover.
8. You can develop QT applications. For a QT clock DEMO, you need to copy the corresponding library to /usr/lib.
9. Add the WIFI module, WIFI startup loading script (sh runnet.sh), WIFI configuration file: /etc/wpa_supplicant.conf, upload file: scp xxx.txt root@192.168.xxx.xxx:/mnt