这是atmega1280单片机串口在线升级部分的汇编源代码，在项目中实际使用过的。-This is atmega1280 microcontroller serial port to upgrade part of the assembly-line source code in the project actually used.

在STM32F103上面的远程升级程序的bootloader。通信方式为串口，程序采用.BIN文件CRC校验传输-STM32F103 above the remote upgrade program bootloader. Communication mode for the serial port, the program uses the CRC file.BIN check transmission