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/ttyS0 crw-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 -Gn pax cdrom floppy audio dip video plugdev netdev bluetooth scanner jgc> sudo adduser jgc dialout [sudo] password for jgc: Adding user jgc to group dialout Done. << Restart done here to ensure new group picked up >> jgc> id -Gn jgc dialout cdrom floppy audio dip video plugdev netdev bluetooth scanner
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串口编程时，出现Cannot open /dev/ttyS0 Permission denied解决,布布扣,bubuko.com
串口编程时，出现Cannot open /dev/ttyS0 Permission denied解决
原文：http://248341.blog.51cto.com/238341/1439044