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M335X触摸屏调试



我在调试AM335X的触摸屏,用的是penmount的9000系列控制器,触摸屏通信方式是串口,调试的时候出现下面的错误,请问大概什么原因

# ./pmsAttach 9000 /dev/ttyO4 19200
# pmsAttach : Failed on setting up line dicipline