CPLD发送模块的实现代码,设计按键检测模块，并将键值通过构造的UART发送模块发送到串口调试工具中查看。--发送格式：1位起始位+8位数据位+1位停止位=10位-CPLD implementation of the code to send the module to design key detection module, and key by constructing the UART to send the module to send to the serial port debugging tool in the view.- Send format: one start bit+8 bit data bits+ 1 stop bit = 10-bit