LED16×16汉字 图形点阵实验

一、实验目的

  1. 掌握16×16 LED点阵显示电路的原理。
  2. 学习用VHDL语言设计较复杂电路。

二、实验原理图

三、实验原理

LED点阵的行为扫描选通信号，列为数据输入。显示采用逐行扫描方式，数据端不断输入数据，行扫描按一定顺序逐行选通，扫描一个周期（16次）产生一帧画面。下图以4×4共阴LED阵列为例，给出了LED阵列的组合方式，行选通低有效，数据高有效；数据端输入数据，选通行根据相应数据亮灯，接着送入第二行数据，选通第二行，依次完成一屏的扫描。只要将要显示的汉字按照16×16的点阵设计好，显示的点数据为1，不显示的点数据为0，即可将汉字显示出来。

本实验仪中16位的列数据位已与FPGA连接好，参行选通位采用地址译码方式，因此16行只需4位地址位

四、实验内容及要求

在LED点阵上循环显示2～4个汉字，内容可以是你的名字或其他汉字。（事先需用汉字点阵文件将汉字的点阵数据设计好。）

五、实验连线

  1. 下载前用20芯排线连接适配板的JP3和LED点阵板的JC1插座。
  2. 同彩灯控制实验。

六、实验现象

在LED块中显示设计的内容。

我的vhdl代码

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library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity dianzhen is
port(clk1,clr,clk2:		in		std_logic;
     addr:     buffer std_logic_vector(3 downto 0);
	 light:		out	std_logic_vector(15 downto 0));
end dianzhen;
architecture behv of dianzhen is
	begin
	process(clk1)
		begin
		if clr='1' then addr<="0000";
		elsif clk1'event and clk1='1' then
			if addr="1111" then addr<="0000";else
			addr <=addr+1;
				end if;
		end if;
	end process;
	process(addr,clk2)
	variable flag: bit_vector(2 downto 0):="000";
	 begin 
	 if clk2'event and clk2='1' then
			if flag="000" then flag:="001";else
			flag:="000";
			end if;
	end if;
	 if flag="000" then
	 	case addr is
		when "0000" => light <="0000100000000010";
		when "0001" => light <="0000100001000010";
		when "0010" => light <="0000100001000010";
		when "0011" => light <="0000100001000010";
		when "0100" => light <="0110100001000010";
		when "0101" => light <="0110101001010010";
		when "0110" => light <="0110101001010010";
		when "0111" => light <="0100101101011010";
		when "1000" => light <="0100101101011010";
		when "1001" => light <="1100100101001010";
		when "1010" => light <="0000100001000010";
		when "1011" => light <="0001100001000010";
		when "1100" => light <="0001100001000010";
		when "1101" => light <="0001000001000010";
		when "1110" => light <="0011000001000010";
		when "1111" => light <="0110000001000010";
		when others =>NULL;
		end case;
	else 
		case addr is
			when "0000" => light <="0011000000000000";
			when "0001" => light <="0001000111111111";
			when "0010" => light <="0001000000000000";
			when "0011" => light <="0000000011111110";
			when "0100" => light <="1111100010000010";
			when "0101" => light <="0000100010000010";
			when "0110" => light <="0001000111111110";
			when "0111" => light <="0011000000000000";
			when "1000" => light <="0011000000000000";
			when "1001" => light <="0111110111111111";
			when "1010" => light <="1111010100010001";
			when "1011" => light <="1011000100010001";
			when "1100" => light <="0011000111111111";
			when "1101" => light <="0011000100010001";
			when "1110" => light <="0011000100010001";
			when "1111" => light <="0011000111111111";
			--when "0000" => light <="0010010010010010";
			when others =>NULL;
		end case;
	end if;	
	end process;	
	end behv;

引脚连接如下：