键盘控制点阵进行ASIC字符显示

1、中北大学课 程 设 计 说 明 书学生姓名:学 院:专 业: 学 号： 08060441 电子与计算机科学技术学院 电子科学与技术题 目: 利用键盘控制点阵进行ASIC字符显示指导教师： 张会新 职称: 讲师2011 年 6月 23 日目录目录21、 课程设计目的32、课程设计内容和要求 32.1、设计内容32.2、设计要求33、设计方案及实现情况 33.1、设计思路33.2、工作原理及框图33.3、各模块功能描述3.4、仿真结果3.5、实验箱验证情况4、课程设计总结5、参考文献1、课程设计目的1.学习操作数字电路设计实验开发系统，掌握矩阵键盘输入模块和点阵显示模块的工作原理及应用。2.掌握组

2、合逻辑电路、时序逻辑电路的设计方法。3.学习掌握可编程器件设计的全过程。2、课程设计内容和要求：2.1、设计内容利用键盘控制点阵进行26个字母的显示2.2、设计要求1学习掌握键盘控制模块、点阵显示模块的工作原理及应用；2. 熟练掌握VHDL编程语言，编写键盘控制模块的控制逻辑；3. 仿真所编写的程序，模拟验证所编写的模块功能；4. 下载程序到芯片中，硬件验证所设置的功能，能够实现ASIC字符显示；5. 整理设计内容，编写设计说明书。3、 设计方案及实现情况3.1、设计思路根据题目设计要求，本系统拟采用自顶向下设计方法，顶层采用原理图设计方法，将整个系统分为键盘控制16×16点阵显示（

3、key）一个模块，通过模块编写程序实现模块功能，最后将模块进行综合实现整个系统的功能，通过键盘控制点阵进行ASIC字符的显示。3.2、工作原理及框图图1 系统整体设计原理图系统的输入信号有：系统时钟信号CLK，按键信号（KININ3.0）。系统的输出信号有：点阵行驱动输出信号（LEDOUT0.15），点阵列选和键盘扫描公用信号（SEL3.0）。系统工作过程为：键盘上按下一个键，扫描信号扫描到按键按下时，在点阵上显示对应的字母。如键盘上按下“0”键时，点阵显示字母“48”；按下键“1”，点阵显示字母“49”如此，键盘上前16个键就分别对应了16个ASIC字符。3.3、各模块功能描述实验箱中4&#

4、215;8矩阵键盘的电路原理图如图2所示。图2 4×8矩阵键盘电路原理图该矩阵键盘的工作原理为：扫描信号为BCOM8.1，在BCOM8.1前已接有一个3-8译码器，3-8译码器的输入为SEL0SEL2。当3-8译码器的输入为000时，即BCOM1为0，其他位为1，我们按下第一排第一键，此时KIN0输出0，KIN1KIN3输出全为1，按下第二排第二键时，KIN1输出0，其他输出1；当3-8译码器输入为001时，即BCOM2为0，我们按下第一排第二键，此时KIN0输出0，KIN1KIN3输出全为1，同理其他键依此类推。键盘上的每个按键就是一个开关，当某键被按下时，该按键的接点会呈现0状态

5、，反之为1。扫描信号为SEL2.0进入3-8译码器，再从译码器输出到键盘，所以第一次只能扫描一排，依此周而复始。若从KIN3.0输出的皆为1时，表示没有按键按下，代表该列没有按键被按下，则不进行按键编码的操作，反之，如果有被按下时，则应将KIN3.0读出的值送到译码电路进行编码。按键位置与数码的关系如下表所示：3.4、仿真结果1、VHDL语言源程序library ieee;use ieee.std_logic_1164.all;use ieee.std_logic_unsigned.all;entity key isarchitecture rtl of key isbeginprocess(

6、clk)variable tmp: std_logic_vector(3 downto 0); variable sel: std_logic_vector(3 downto 0); variable dat: std_logic_vector(3 downto 0); beginif clk'event and clk='1' thenif tmp="1111" thentmp:="0000"elsetmp:=tmp+1;end if;end if;if kin = "1111" then sel:=tmp;

7、 dat := "1111" else end if; selout <= tmp; if (sel="0000" or sel="1000") and kin="1110" then dat := "0000" dat := "0001" - 0 - 1 elsif (sel="0001" or sel="1001") and kin="1110" then elsif (sel="0010&quo

8、t; or sel="1010") and kin="1110" then port(clk:in std_logic; ledout:out std_logic_vector(15 downto 0); selout:out std_logic_vector(3 downto 0); kin:in std_logic_vector(3 downto 0); end key; -dat := "0010" dat := "0011" dat := "0100" dat := "0101

9、" dat := "0110"- 2 - 3 - 4 - 5 - 6elsif (sel="0011" or sel="1011") and kin="1110" then elsif (sel="0110" or sel="1110") and kin="1110" then elsif (sel="0111" or sel="1111") and kin="1110" then el

10、sif (sel="0000" or sel="1000") and kin="1101" then elsif (sel="0001" or sel="1001") and kin="1101" thendat := "0111" - 7 dat := "1000" - 8 dat := "1001" - 9 dat := "1010" - A dat := "1011"-

11、Belsif (sel="0100" or sel="1100") and kin="1101" then elsif (sel="0101" or sel="1101") and kin="1101" then elsif (sel="0110" or sel="1110") and kin="1101" then elsif (sel="0111" or sel="1111"

12、;) and kin="1101" then elsif (sel="0010" or sel="1010") and kin="1011" thendat := "1100" - C dat := "1101" - D dat := "1110" - E dat := "1111" - Felsif (sel="0011" or sel="1011") and kin="1011&qu

13、ot; then elsif (sel="0100" or sel="1100") and kin="1011" then elsif (sel="0101" or sel="1101") and kin="1011" then end if;- if kin = "1111" thencase dat iswhen"0000"=> -0 zhongcase tmp iswhen "0001" => le

14、dout<="0000000000000000" when "0010" => ledout<="0011111000110000" when "0011" => ledout<="0110001100111000" when "0100" => ledout<="0110001100111100" when "0101" => ledout<="0110001100110

15、110" when "0110" => ledout<="0011111000110011" when "0111" => ledout<="0110001101111111" when "1000" => ledout<="0110001100110000" when "1010" => ledout<="0110001100110000"when "0000&quo

16、t; => ledout<="0000000000000000" -0when "1001" => ledout<="0110001100110000"when "1011" => ledout<="0011111001111000" when "1100" => ledout<="0000000000000000" when "1101" => ledout<="0

17、000000000000000" when "1111" => ledout<="0000000000000000" when others => null; when "0001" => -1 end case; case tmp iswhen "0000" => ledout<="0000000000000000" when "0001" => ledout<="0000000000000000"

18、; when "0010" => ledout<="0000000000000000" when "0011" => ledout<="0011111000110000" when "0100" => ledout<="0110001100111000" when "0101" => ledout<="0110001100111100" when "0110" =>

19、; ledout<="0110001100110110" when "0111" => ledout<="0111111000110011" when "1000" => ledout<="0110000001111111" when "1001" => ledout<="0110000000110000" when "1010" => ledout<="011000000

20、0110000" when "1011" => ledout<="0011000000110000" when "1100" => ledout<="0001111001111000" when "1101" => ledout<="0000000000000000" when "1110" => ledout<="0000000000000000" when "111

21、1" => ledout<="0000000000000000" when others => null; when "0010" => -2 when "0000" => ledout<="0000000000000000" when "0001" => ledout<="0000000000000000" when "0010" => ledout<="0000000000

22、000000" when "0011" => ledout<="0001110001111111" when "0100" => ledout<="0011011000000011" when "0101" => ledout<="0110001100000011" when "0110" => ledout<="0110000110000011" when "0111

23、" => ledout<="0110101100111111" when "1000" => ledout<="0110101101100000" when "1001" => ledout<="0110001101100000" when "1010" => ledout<="0110001101100000" when "1011" => ledout<=&quo

24、t;0011011001100011" when "1100" => ledout<="0001110000111110" when "1101" => ledout<="0000000000000000" when "1110" => ledout<="0000000000000000" when "1111" => ledout<="0000000000000000" end

25、 case; case tmp iswhen others => null; when "0011" => -3 end case;case tmp iswhen "0000" => ledout<="0000000000000000" when "0001" => ledout<="0000000000000000" when "0010" => ledout<="0000000000000000" whe

26、n "0011" => ledout<="0001100001111111" when "0100" => ledout<="0001110000000011" when "0101" => ledout<="0001111000000011" when "0110" => ledout<="0001100000000011" when "0111" => led

27、out<="0001100000111111" when "1000" => ledout<="0001100001100000" when "1001" => ledout<="0001100001100000" when "1010" => ledout<="0001100001100000" when "1011" => ledout<="00011000011000

28、11" when "1100" => ledout<="0111111000111110" when "1101" => ledout<="0000000000000000" when "1110" => ledout<="0000000000000000" when "1111" => ledout<="0000000000000000" when others => n

29、ull;end case;when "0100" => -4 52 case tmp iswhen "0000" => ledout<="0000000000000000" when "0001" => ledout<="0000000000000000" when "0010" => ledout<="0000000000000000" when "0011" => ledout<

30、="0011111001111111" when "0100" => ledout<="0110001100000011" when "0101" => ledout<="0110000000000011" when "0110" => ledout<="0011000000000011" when "0111" => ledout<="0001100000111111"

31、; when "1000" => ledout<="0000110001100000" when "1001" => ledout<="0000011001100000" when "1010" => ledout<="0000001101100000" when "1011" => ledout<="0110001101100011" when "1100" =>

32、; ledout<="0111111100111110" when "1101" => ledout<="0000000000000000" when "1110" => ledout<="0000000000000000" when "1111" => ledout<="0000000000000000" when others => null;end case;when "0101"

33、=> -5 53 case tmp iswhen "0000" => ledout<="0000000000000000" when "0001" => ledout<="0000000000000000" when "0010" => ledout<="0000000000000000" when "0011" => ledout<="0011111001111111" when

34、"0100" => ledout<="0110001100000011" when "0101" => ledout<="0110000000000011" when "0110" => ledout<="0110000000000011" when "0111" => ledout<="0011110000111111" when "1000" => ledou

35、t<="0110000001100000" when "1001" => ledout<="0110000001100000" when "1010" => ledout<="0110000001100000" when "1011" => ledout<="0110001101100011" when "1100" => ledout<="0011111000111110

36、" when "1101" => ledout<="0000000000000000" when "1110" => ledout<="0000000000000000" when "1111" => ledout<="0000000000000000" when others => null;end case;when "0110" => -6 54 case tmp iswhen "0

37、000" => ledout<="0000000000000000" when "0001" => ledout<="0000000000000000" when "0010" => ledout<="0000000000000000" when "0011" => ledout<="0011000001111111" when "0100" => ledout<=&

38、quot;0011100000000011" when "0101" => ledout<="0011110000000011" when "0110" => ledout<="0011011000000011" when "0111" => ledout<="0011001100111111" when "1000" => ledout<="0111111101100000"

39、when "1001" => ledout<="0011000001100000" when "1010" => ledout<="0011000001100000" when "1011" => ledout<="0011000001100011" when "1100" => ledout<="0111100000111110" when "1101" =>

40、ledout<="0000000000000000" when "1110" => ledout<="0000000000000000" when "1111" => ledout<="0000000000000000" when others => null;end case;when "0111" => -7 55 case tmp iswhen "0000" => ledout<="00

41、00000000000000" when "0001" => ledout<="0000000000000000" when "0010" => ledout<="0000000000000000" when "0011" => ledout<="0111111101111111"when "0100" => ledout<="0000001100000011" when &qu

42、ot;0101" => ledout<="0000001100000011" when "0110" => ledout<="0000001100000011" when "0111" => ledout<="0011111100111111" when "1000" => ledout<="0110000001100000" when "1001" => ledout&l

43、t;="0110000001100000" when "1010" => ledout<="0110000001100000" when "1011" => ledout<="0110001101100011" when "1100" => ledout<="0011111000111110" when "1101" => ledout<="0000000000000000&qu

44、ot; when "1110" => ledout<="0000000000000000" when "1111" => ledout<="0000000000000000" when others => null;end case;when "1000" => -8 56 case tmp iswhen "0000" => ledout<="0000000000000000" when "0001

45、" => ledout<="0000000000000000" when "0010" => ledout<="0000000000000000" when "0011" => ledout<="0001110001111111" when "0100" => ledout<="0000011000000011" when "0101" => ledout<=&quo

46、t;0000001100000011" when "0110" => ledout<="0000001100000011" when "0111" => ledout<="0011111100111111" when "1000" => ledout<="0110001101100000" when "1001" => ledout<="0110001101100000" whe

47、n "1010" => ledout<="0110001101100000" when "1011" => ledout<="0110001101100011" when "1100" => ledout<="0011111000111110" when "1101" => ledout<="0000000000000000" when "1110" => led

48、out<="0000000000000000" when "1111" => ledout<="0000000000000000" when others => null;end case;when "1001" => -9 57 case tmp iswhen "0000" => ledout<="0000000000000000" when "0001" => ledout<="00000

49、00000000000" when "0010" => ledout<="0000000000000000" when "0011" => ledout<="0111111101111111" when "0100" => ledout<="0110001100000011" when "0101" => ledout<="0110000000000011" when "

50、;0110" => ledout<="0110000000000011" when "0111" => ledout<="0011000000111111"when "1000" => ledout<="0001100001100000" when "1001" => ledout<="0000110001100000" when "1010" => ledout<=

51、"0000110001100000" when "1011" => ledout<="0000110001100000" when "1100" => ledout<="0000110000111110" when "1101" => ledout<="0000000000000000" when "1110" => ledout<="0000000000000000"

52、 when "1111" => ledout<="0000000000000000" when others => null;end case;when "1010" => -A 65 case tmp iswhen "0000" => ledout<="0000000000000000" when "0001" => ledout<="0000000000000000" when "0010&qu

53、ot; => ledout<="0000000000000000" when "0011" => ledout<="0111111100011100" when "0100" => ledout<="0000001100000110" when "0101" => ledout<="0000001100000011" when "0110" => ledout<="0

54、000001100000011" when "0111" => ledout<="0011111100111111" when "1000" => ledout<="0110000001100011" when "1001" => ledout<="0110000001100011" when "1010" => ledout<="0110000001100011" when &

55、quot;1011" => ledout<="0110001101100011" when "1100" => ledout<="0011111000111110" when "1101" => ledout<="0000000000000000" when "1110" => ledout<="0000000000000000" when "1111" => ledout

56、<="0000000000000000" when others => null;end case;when "1011" => -B 66 case tmp iswhen "0000" => ledout<="0000000000000000" when "0001" => ledout<="0000000000000000" when "0010" => ledout<="00000000

57、00000000" when "0011" => ledout<="0001110000011100" when "0100" => ledout<="0000011000000110" when "0101" => ledout<="0000001100000011" when "0110" => ledout<="0000001100000011" when "01

58、11" => ledout<="0011111100111111" when "1000" => ledout<="0110001101100011" when "1001" => ledout<="0110001101100011" when "1010" => ledout<="0110001101100011" when "1011" => ledout<=&q

59、uot;0110001101100011"when "1100" => ledout<="0011111000111110" when "1101" => ledout<="0000000000000000" when "1110" => ledout<="0000000000000000" when "1111" => ledout<="0000000000000000" wh

60、en others => null;end case; when "1100" => -c 67 case tmp iswhen "0000" => ledout<="0000000000000000" when "0001" => ledout<="0000000000000000" when "0010" => ledout<="0000000000000000" when "0011"

61、; => ledout<="0111111100011100" when "0100" => ledout<="0110001100000110" when "0101" => ledout<="0110000000000011" when "0110" => ledout<="0110000000000011" when "0111" => ledout<="001

62、1000000111111" when "1000" => ledout<="0001100001100011" when "1001" => ledout<="0000110001100011" when "1010" => ledout<="0000110001100011" when "1011" => ledout<="0000110001100011" when &qu

63、ot;1100" => ledout<="0000110001111111" when "1101" => ledout<="0000000000000000" when "1110" => ledout<="0000000000000000" when "1111" => ledout<="0000000000000000" when others => null;end case;when

64、 "1101" => -D 68 case tmp iswhen "0000" => ledout<="0000000000000000" when "0001" => ledout<="0000000000000000" when "0010" => ledout<="0000000000000000" when "0011" => ledout<="0011111000

65、011100" when "0100" => ledout<="0110001100000110" when "0101" => ledout<="0110001100000011" when "0110" => ledout<="0110001100000011" when "0111" => ledout<="0011111000111111" when "1000

66、" => ledout<="0110001101100011" when "1001" => ledout<="0110001101100011" when "1010" => ledout<="0110001101100011" when "1011" => ledout<="0110001101100011" when "1100" => ledout<=&quo

67、t;0011111000111110" when "1101" => ledout<="0000000000000000" when "1110" => ledout<="0000000000000000" when "1111" => ledout<="0000000000000000"when others => null;when "0000" => ledout<="0000

68、000000000000" when "0001" => ledout<="0000000000000000" when "0010" => ledout<="0000000000000000" when "0011" => ledout<="0011111000011100" when "0100" => ledout<="0110001100000110" when &quo

69、t;0101" => ledout<="0110001100000011" when "0110" => ledout<="0110001100000011" when "0111" => ledout<="0111111000111111" when "1000" => ledout<="0110000001100011" when "1001" => ledout<="0110000001100011" when "1010" => ledout<="0110000001100011" when "1011" => ledout<="0011000001100011" when "1100" => ledout<="0001111000111110"