北航电气实验FPGA实验报告

1、北京航空航天大学电气实验报告FPGA实验张天130325班 学号：13031220一 实验目的略二 实验要求略三 实验设备略四 实验内容略五 实验实例1. 实例6-1思考题1：输出信号q3q2q1绑定接口电路的七段数码管或米字型数码管或LED点阵显示？答：思考题2：怎样修改成4位二进制减法计数器，具有清零，启动控制功能等？答：思考题3：把计数器修改成2位或更多位十进制计数功能，再用七段数码管进行显示等？答：2. 实例6-2思考题：一位半加器电路采用VHDL语言实验 答： library ieee;use ieee.std_logic_1164.all;use iee.std_logic_uns

2、igned.all;entity halfadd isport (a,b;in std_logicsum,carry; out std_logic)end entity halfadd;architecture halfadd isbeginsum<=a and(not b)+b and (not a);carry<= a and b;end architecture halfadd;六 实验过程我们组做的是一个利用led点阵规律亮灭变化形成字体，并且字体产生变化，形成“自动化”的样子，实现图片如下图：1. 实验分析：实验设计思路：本实验的设计思路是利用led灯的辉光效应，利用逐行

3、扫描，在高频情况下就会显示所有行的亮灯，进而形成汉字，并且有时钟计数程序，当时钟数字达到规定值（本实验为111111111b）时，跳转到下一个状态，显示第二个憨子。每个汉字的颜色由led灯决定，改led矩阵有红绿两种led灯，因此有红绿橙三种颜色显示。2. 实现过程对设计思路的实现并非一帆风顺，最初编写的时候遇到了一些问题。首先，定义输入输出角是个繁琐的事情（需要定义40+次，每次必须手动），另外，在程序编写过程中，也出现了一些逻辑错误，对于错误，我们仔细逐条语句分析，最终解决了错误，解决过程中也加深了对FPGA的语言逻辑及硬件结构的理解。七 .FPGA使用心得在学习FPGA过程中，我获得了很

4、多收获。首先，由于有单片机的基础，上手过程并不是十分复杂，对于输入输出的理解我没有遇到太多阻碍。这次学习也验证了我具有短时间内掌握一款新型的芯片的能力。学习过程中最大的困难就是VDHL语言的编写。我们以前有c语言的基础，不过学习这种新的语言还是花出了不少时间与精力，现在可以说基本掌握的VDHL的基本写法和思路，能运用到需要的程序中来。另外，调试的过程能极强地加大对程序的理解及逻辑的构建，在调试中，逐渐明白了以前不懂的东西，对FPGA的工作原理的理解更加透彻了。不了解的人可能会把FPGA当做一种单片机，但其实，相比于单片机，FPGA是有很多优势的。其无固定的硬件结构使其具有远超单片机的灵活性，另

5、外，它的编程方法可以同步进行多个process使其能同步处理多个进程，因此，它的运算效率大大提高，在当今社会，有很大的利用价值。八 .电气实验总结略附：程序library ieee;use ieee.std_logic_1164.all;use ieee.std_logic_unsigned.all;entity led isport(clk:in std_logic; rst:in std_logic; com:out std_logic_vector(7 downto 0); red:out std_logic_vector(7 downto 0); green:out std_logic

6、_vector(7 downto 0);end;architecture led of led isconstant s0:std_logic_vector(1 downto 0):="00" constant s1:std_logic_vector(1 downto 0):="01" constant s2:std_logic_vector(1 downto 0):="10" constant s3:std_logic_vector(1 downto 0):="11" signal present:std_log

7、ic_vector(1 downto 0); signal com1:std_logic_vector(7 downto 0);signal red1:std_logic_vector(7 downto 0);signal green1:std_logic_vector(7 downto 0);signal count:std_logic_vector(9 downto 0);signal zi:std_logic_vector(2 downto 0);beginprocess(rst,clk)beginif(rst='0')then-系统初始化 present<=s0;

8、 com1<=(others=>'0');elsif(clk'event and clk='1')then case present is when s0=>if(com1="00000000")then com1<="11111111" red1<="11111111" green1<="11111111" zi<="000" present<=s0; else if(count="1111111

9、11")then count<=(others=>'0'); present<=s1; else case zi is when "000"=> com1<="00001000" red1<="00000001" green1<="00000000" count<=count+1; zi<=zi+1; when "001" => com1<="00111100" red1<=&q

10、uot;00000010" green1<="00000000" count<=count+1; zi<=zi+1; when "010"=> com1<="00100100" red1<="00000100" green1<="00000000" count<=count+1; zi<=zi+1; when "011"=> com1<="00111100" red1<=&q

11、uot;00001000" green1<="00000000" count<=count+1; zi<=zi+1; when "100"=> com1<="00100100" red1<="00010000" green1<="00000000" count<=count+1; zi<=zi+1; when "101"=> com1<="00111100" red1<=&q

12、uot;00100000" green1<="00000000" count<=count+1; zi<=zi+1; when "110"=> com1<="00100100" red1<="01000000" green1<="00000000" count<=count+1; zi<=zi+1; when "111"=> com1<="00111100" red1<=&q

13、uot;10000000" green1<="00000000" count<=count+1; present<=s0; zi<="000" end case; end if; end if; when s1=>if(count="111111111")then -S1模式：从右到左逐个点亮LED count<=(others=>'0'); present<=s2; else present<=s1; case zi is when "000&

14、quot;=> com1<="00100000" red1<="00000001" green1<="00000001" count<=count+1; zi<=zi+1; when "001" => com1<="00100000" red1<="00000010" green1<="00000010" count<=count+1; zi<=zi+1; when "010

15、"=> com1<="00100110" red1<="00000100" green1<="00000100" count<=count+1; zi<=zi+1; when "011"=> com1<="11110000" red1<="00001000" green1<="00001000" count<=count+1; zi<=zi+1; when "100

16、"=> com1<="10101111" red1<="00010000" green1<="00010000" count<=count+1; zi<=zi+1; when "101"=> com1<="10100100" red1<="00100000" green1<="00100000" count<=count+1; zi<=zi+1; when "110

17、"=> com1<="10101010" red1<="01000000" green1<="01000000" count<=count+1; zi<=zi+1; when "111"=> com1<="10101111" red1<="10000000" green1<="10000000" count<=count+1; present<=s0; zi<=&quo

18、t;000" end case; count<=count+1; present<=s1; end if; when s2=>if(count="111111111")then -S2模式：从两边到中间逐个点亮LED count<=(others=>'0'); present<=s3; else case zi is when "000"=> com1<="00011000" red1<="00000000" green1<=&q

19、uot;00000001" count<=count+1; zi<=zi+1; when "001" => com1<="00010100" red1<="00000000" green1<="00000010" count<=count+1; zi<=zi+1; when "010"=> com1<="01010010" red1<="00000000" green1<=&

20、quot;00000100" count<=count+1; zi<=zi+1; when "011"=> com1<="00110011" red1<="00000000" green1<="00001000" count<=count+1; zi<=zi+1; when "100"=> com1<="00010010" red1<="00000000" green1<=&

21、quot;00010000" count<=count+1; zi<=zi+1; when "101"=> com1<="00011010" red1<="00000000" green1<="00100000" count<=count+1; zi<=zi+1; when "110"=> com1<="10010010" red1<="00000000" green1<=&

22、quot;01000000" count<=count+1; zi<=zi+1; when "111"=> com1<="11110010" red1<="00000000" green1<="10000000" count<=count+1; present<=s0; zi<="000" end case; count<=count+1; present<=s2; end if; when s3=>if(coun

23、t="111111111")then count<=(others=>'0'); present<=s0; else present<=s3; case zi is when "000"=> com1<="00000000" red1<="00000001" green1<="00000000" count<=count+1; zi<=zi+1; when "001" => com1<=&

24、quot;01100110" red1<="00000010" green1<="00000000" count<=count+1; zi<=zi+1; when "010"=> com1<="11111111" red1<="00000100" green1<="00000000" count<=count+1; zi<=zi+1; when "011"=> com1<="11111111" red1<="00001000" green1<=&