Introduction - If you have any usage issues, please Google them yourself
This program implements the following functions: boot time to check whether the SD card and SPI FLASH existed and, if its capacity is acquired and displayed on the LCD above (if does not exist, an error). After the start of USB configuration, you can find two removable disks on the computer after a successful configuration. We use DS1 to indicate that USB is being accessed and displayed on the LCD, the same, we still use DS0 to indicate that the program is running.