实现12864液晶的图形显示，汉字反白!画直线画斜线等操作-shi xian ST7920 SHOU!VERY GONG,THIA S GONG GOGND,GOOD.shi xian ST7920 SHOU!VERY GONG

1602画圆，打点，显示普通字符，画线，横竖线，任意线，交叉线，以及任意处反白-1602 Circle, RBI, showing ordinary characters, draw lines, horizontal and vertical lines, arbitrary lines, intersecting lines, as well as highlight any place