终于搞定了这个lcd液晶显示的程序，净是犯些不该犯的错误，还本人找了那么久，先是仿真查了所有时钟信号，又查了lcd_rs和lcd_rw，都没有错-Finally fix the LCD program, clean is a hideous make some stupid mistakes, I look for so long, the first looked up all the clock signal, and checked lcd_rs and lcd_rw, all not wrong