Merge pull request #2 from JacksonTeh/master

Add still another silly function
Merge pull request #3 from JacksonTeh/master

Restore to default
Merge pull request #4 from JacksonTeh/master

Add UART and Serial Interrupt src file
Optimise spiMaster.c and added test code
Modify flashBufferFlush() and added test code for flash buffer
Add test code to test the Serial Interupt