Enable the float-point hard mode
Move the fatfs into lib folder
Merge branch 'master' of shengwen1997
Remove the uselesss global files in folder "config"
Rename function "commandIdentify" to "cmdSpiltToken"
Fix the task priority issue of "shell", "SD" and "Error handler"
Remove the SD task, start porting as a shell command
Porting the SD save task as a command
Fix the wrong SD_status flag of the error handler
Rename some system files and remove the old test files
Fix the wrong FPU mode
Move the floder "stdlib" into the "lib"
Move the debug files into the new folder "debug"
Add startup's obj file remove action in the Makefile
Move LINENOISE.md into the new folder "documentation"
Create the LED operating functions
Add test command for testing the new function
Unblock the blocking code under STM32F4-Discovery board
Rename some files and rearrange some codes
Update the new AHRS file name