nios2下的串口访问程序，包括发送和接受，一共有两个，不同的编程风格-serial port access under nios2 procedures, including send and receive, a total of two different programming styles

基于NIOS2的串口初始化设计程序，在应用中只要加上这个初始化就可完成所有的初始化任务-Based on the serial port initialization NIOS2 design process, in applications, coupled with this initialization can be completed as long as all of the initialization task

串口测试，用于NIOS2中 对于串口收发的测试，用来调试软核的串口-Serial port test, for NIOS2 in the test for serial transceiver is used to soft-core debugging serial port