用74HC595芯片设计一个心形，但需要硬件对应，如果只是想学习74HC595的工作原理的话，此代码可以给你带来初步的了解。代码标有详细的注释，有助于新手阅读。-74HC595 chip design, a heart-shaped, but needs the hardware corresponding, if you just want to learn 74HC595 works, this code can give you a preliminary understanding. T