RT-Thread/rt-thread — pull request #167 by grissiom (2013-10-09 12:40:32+00:00)
Title: components/utilities: add ymodem

Real-YModem implemented a flexible YModem support. It use callback-based
structure to let the user application to deal with the data. It contains
3 examples:

1. echo.c: write the data recieved on YModem to an other device
2. null.c: discard the YModem data
3. tofile.c: write the data to the file system

Currently, it does not support batch file transmission.