master
 add serial.c
Delete serial.c
 adding test shell
 adding a testing shell

ch 'origin/Avalon-MM-nano' into Avalon-MM-nano

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.
 Modified testing shell
 modified cdc_main.c protocol.h
 modified cdc_main.c, can sussess return
Merge branch 'Avalon-nano-mm-progress' into Avalon-MM-nano

Conflicts:
	firmware/code/src/cdc_main.c
modified cdc_main.c .Can be successfully returns.
 modified cdc_main.c
Merge pull request #1 from microelectron/Avalon-nano-mm-progress

 modified cdc_main.c
" MM protocol supported Detect andr data packagce, return nonce "
" deleted cdc_main.c comment "
Delete unused