update uart loopback test
update bitUart.c
update bitUart.c
update bitUart.c
update bitI2cSwitch
update bitI2cSwitch.c
fix one bug in bitUartDev.c
update i2cswitch main.c
update bitI2cSwitch.c
update bitI2cSwitch.c
Merge branch 'master' of https://github.com/h264mp4/practice