这个代码是我参考多人的代码，并用了很长时间才调试出来的！应经在硬件电路上实验成功！ 说明：我采用的开发板是Diligent公司采用Xilinx公司的芯片生产的板卡，这里的LCD数据接口只用低四位，所以八位数据要采用两次输入来完成！！ library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity LCD1602 is Port ( clk : in std_logic; reset : in std_logic; lcd_rs : out std_logic; lcd_rw : out std_logic; flash_ce:out std_logic; lcd_en : out std_logic; data : out std_logic_vector(3 downto 0)); end LCD1602; architecture Behavioral of LCD1602 is type iState is ( Write_instr, --写命令字 Write_DataUP4_1, --写LCD一线高4位 Write_DataDown4_1, --写LCD一线低4位 Set_DDRamAddUp, --设置DDRam地址高4位 Set_DDRamAddDown, --设置DDRam地址低4位 Write_DataUP4_2, --写LCD二线高4位 Write_DataDown4_2 --写LCD二线低4位 ); signal State:iState; type Ram is array(0 to 39) of std_logic_vector(7 downto 0); constant MyRamUp:Ram:=(x"57",x"65",x"6c",x"63",x"6f",x"6d",x"65",x"20",x"74",x"6f",x"20",x"53",x"44",x"55",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20"); --Welcome to SDU constant MyRamDown:Ram:=(x"20",x"20",x"20",x"20",x"49",x"53",x"45",x"27",x"73",x"20",x"45",x"44",x"41",x"4c",x"41",x"42",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20",x"20"); -- EDA's EDALAB --signal lcd_clk:std_logic; signal datacnt:integer range 0 to 39:=0; signal ramcnt:integer range 0 to 2:=0; signal delay_count,num_count:integer:=0; signal state_change,clk1:std_logic; begin lcd_rw if(datacnt=0) then data if(ramcnt=0) then lcd_rs if(ramcnt=0) then if datacnt=39 then data --0xc0 : 1100 0000=40H 设定第二行读写地址位 if(ramcnt=0) then lcd_rs if(ramcnt=0) then data if(ramcnt=0) then lcd_rs if(ramcnt=0) then if datacnt=39 then data state

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