【打印调试信息出现的一个奇怪现象……】

keenkeen

【打印调试信息出现的一个奇怪现象……】

目的：将一串指令拆成一个个byte发送出去，输出到串口，打印相关信息为：
当选择串口为ttyS1时（板子内部模块的一个串口），输出调试信息为：
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial

当选择ttyS1时（输出到板子外的串口），却出现了：
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial （前面有个字符，这里显示不到形状，朝下是个三角行，超级终端中）
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:01 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial（前面有个字符，这里显示不到形状，朝下是个三角行，超级终端中）

70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
?0-01-01 00:00:02 <0>DP: 1 bytes sent to serial   （前面出现“？”号）
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial （前面出现菱形）
?0-01-01 00:00:02 <0>DP: 1 bytes sent to serial （“？”）
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial
70-01-01 00:00:02 <0>DP: 1 bytes sent to serial

而且是每个byte对应这前面那个字符，每次显示都这这样,把ttyS0改为ttyS1就不会出现这样的问题了，不知道是超级终端还是什么原因。多谢指点