The original NuLib has been ported to many different systems. Version 3.2.5 is functionally similar to v3.2.4, but the source code and documentation were cleaned up by Devin Reade, making it easier to build. NuLib2 is generally superior, but NuLib does have the advantage of running under 16-bit MS-DOS and GS/OS.
Gcomm is a serial communications program similar to seyon, but more modern, and easier to use. Works over serial port, via TCP/IP, or a pipe through another program. Supports xmodem/ymodem/zmodem protocols. Visit the gcomm.sourceforge.net home page for 系統(tǒng)是 Linux ，但是協(xié)議部分是可用的
AVR306串口程序例子----查詢模式
Application Note AVR306
* Polled mode driver for UART, this is the similar to the
* library default putchar() and getchar() in ICCAVR
