Verilog编写UART串口例程，实现FPGA与上位机串口通信，利用ASCII码进行大小写转换，在Xilinx Virtex-5开发板测试通过-UART serial routines written in Verilog, FPGA serial communication with the host computer using the ASCII code case conversion, in the Xilinx Virtex-5 development board test