uart串口COM双机通讯测试程序范例

测试产生乱码，读取到的数据显示不出来。
打印如下：
[root@localhost test]# ./uart /dev/ttyS4 rx
fcntl=0
isatty success!
fd->open=3
Set Port Exactly!
fs_sel = 1
I am right!(version1.2) len = 99 fs_sel = 1
receive data is
len = 99
fs_sel = 1
I am right!(version1.2) len = 99 fs_sel = 1
receive data is ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
len = 99
fs_sel = 1
I am right!(version1.2) len = 99 fs_sel = 1
receive data is ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
len = 99
fs_sel = 1