请教,
我执行serial_test 测试串口,没有回显数据
全是厂家原始的程序和系统
[root@EmbedSky /]# serial_test
readserailcfg
serialread.dev is /dev/tq2440_serial2
serialread.speed is 115200
serialread.databits is 8
serialread.stopbits is 1
serialread.parity is N
isatty success!
nwrite=15