这是一个实现uart串口字符和文本传输，还有字符大小写转换的源程序。-This is a realization of UART serial characters and text transmission, there are characters in case the conversion of the source.

介绍JN5139这款SOC芯片的串口测试程序（5139与PC机通信），PC机使用的是串口调试助手，开发环境为Jennic CodeBlocks软件，使用C语言编写。-Introduction JN5139 this SOC chip serial testing procedures (5139 and PC-communication), PC machine using a serial debugging assistant for the Jennic CodeBlocks softwa

串口学习程序，对于初学者或者在校大学生有很好的引导作用-Serial learning process, for beginners or college students have a good guide