在ubuntu14.04上，通过qt creator进行串口编程时出现：
trying to open file "/dev/ttyS0"
could not open file: 权限不够
port open is false
jgc> ls -al /dev/ttyS0crw-rw---- 1 root dialout 4, 64 Mar 23 21:00 /dev/ttyS0
jgc> echo xyzzy >/dev/ttyS0
bash: /dev/ttyS0: Permission denied
解决方法如下：
jgc> id -Gnpax cdrom floppy audio dip video plugdev netdev bluetooth scannerjgc> sudo adduser jgc dialout[sudo] password for jgc: Adding user jgc to group dialoutDone.<< Restart done here to ensure new group picked up >>jgc> id -Gnjgc dialout cdrom floppy audio dip video plugdev netdev bluetooth scanner
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