can通讯，采用can的回环模式，开发环境是keil，程序采用独立按键控制。-can communicate using the loopback mode can the development environment is keil, the program uses independent control buttons.

设计一个与PC串口通信的实验系统，当在PC机上输入十进制数时，可在实验板上显示相应的十六进制数字，而在实验板上按下独立按键A时，在PC机上也可以显示其对应的管脚数56。-Design an experiment with the PC serial communication system, when the PC input decimal number, you can experiment on-board display the corresponding hexadecimal num

FPGA开发板数码管按键测试程序 数码管跑数 独立按键控制数码管加一 开关控制数码管亮灭(FPGA development board digital tube key test program digital tube running number independent keystroke control digital tube add a switch to control the digital tube)