ＦＰＧＡ实现蜂鸣器功能，代码虽然简单，对初学者还是很有帮助的，感受一下ＦＰＧＡ编程的魅力-FPGA implementation buzzer function code, though simple, is helpful for beginners, to experience the charm of FPGA programming

I2C总线OLED驱动,I2C走线显示，利用最少引脚达到最大显示效果，可以体会一下I2C总线的魅力与强大(I2C bus OLED drive, the I2C line shows that the maximum display effect can be achieved by using the minimum pin, which can experience the charm and power of the I2C bus)