在12864液晶里面能够实现任意点的画线，方便自己自定义显示字符，图形-12864 LCD which can be achieved at any point of the painting line, to facilitate their own custom display characters, graphics,

Programs I wrote for 8051 processors, including : - Various multiplications (16x16, 32x8...) - div, atn, ln, sin, sqrt - bresenham for line and circle - 32bit cordic (linear, circular, hyperbolic) - date conversion - random generation