ARM 平台下的串口测试源代码，支持com1-com9 ，支持多种波特率。基于evc4.0+sp4开发，可以直接编译使用。-ARM platform source code to test the serial port to support the com1-com9, supports a wide range of baud rate. Evc4.0+ sp4-based development, can direct the compiler to use.