基于DSP芯片的键盘控制LCD显示

1、*大学*学院课程设计报告题 目：基于DSP芯片的键盘控制LCD显示专 业： 通信工程 班 级： 一班 姓 名： * 学 号： * 指导教师： * 年 月 日信息与电气工程学院课程设计任务书20 15 20 16 学年第 一 学期专业： 学号： 姓名： 课程设计名称： DSP原理与应用 设计题目： 基于DSP芯片的键盘控制LCD显示 完成期限：自 2015 年 12 月 21 日至 2015 年 12 月 25 日共 1 周设计依据、要求及主要内容（可另加附页）：一、设计依据通过4 * 4的行列式键盘，TMS320F2407的8个I / O口与之相连，用扫描法来进行按键识别。使行线一直处于高电平

2、，在某一时刻只让一条列线处于低电平，而其余列线处于高电平。那么按下键的那列电平就会拉成低电平，判断出哪列为低电平就可以判断出按键号码。二、设计要求1.要求正确掌握CCS2000的安装和调试方法，以及DSP实验箱下载调试的步骤；2.要求正确掌握键盘信号的输入和DSP I/O的使用；3.要求键盘信号之间的时序能正确识别和引入。三、主要内容1.根据行列式键盘的特点，进行键盘控制系统的整体研究与设计；2.熟练掌握CCS2000软件的使用，并能够按要求对设计的电路进行仿真，实现相应的功能；3.LCD液晶显示屏实时显示按键的信息；4.采用软件编程的方法实现按键信息的提取和显示。指导教师（签字）： 批准日期

3、： 年 月 日摘要 随着21世纪的到来，电子信息行业将是人类社会的高科技行业之一，式设施现代化的基础，也是人类通往科技巅峰的直通路。电子行业的发展从长远来看很重要，但最主要的还是科技问题。 行列式键盘提高效率进行按键操作管理有效方法，它可以提高系统准确性，有利于资源的节约，降低对操作者本身素质的要求。是它能准时、实时、高效地显示按键信息，以提高工作效率和资源利用率。行列式键盘乃是当今使用最为广泛的键盘模式之一，该系统以8个端口连接控制4*4个按键，即时在LCD数码管上。单片机控制的据这是键盘显示系统，该系统可以对不同的按键进行实时显示，其核心是插上2407主控板的DSP实验箱和键盘矩阵电路部分

4、，主要对按键与显示电路的关系、矩阵式技术及设备系统的硬件、软件等各个部分进行实现。4*4矩阵式键盘采用插上2407主控板的DSP实验箱为核心，主要由矩阵式键盘电路、译码电路、显示电路等组成，软件选用汇编语言编程。单片机将检测到的按键信号转换成数字量，显示于LCD显示器上。该系统灵活性强，易于操作，可靠性高，将会有更广阔的开发前景。关键字:插上2407主控板的DSP实验箱；行列式；LCD；键盘 目录1、 实验目的.52、 实验设备.53、 实验原理.64、 实验步骤.75、 程序.86、 实验总结.25七、参考文献.25基于DSP芯片的键盘控制LCD显示1、 实验目的 1.掌握CCS2

5、000的安装和调试方法，以及DSP实验箱下载调试的步骤； 2.掌握键盘信号的输入，DSP I/O口的使用； 3.掌握键盘信号之间时序的正确识别和引入。二、实验设备1.一台装有CCS2000软件的计算机； CCS2000具有以下特性：TI编译器的完全集成的环境：CCS2000目标管理系统，内建编辑器，所有的调试和分析能力集成在一个Windows环境中。对c和DSP汇编文件的目标管理：目标编辑器保持对所有文件及相关内容的跟踪。它只对最近一次编译中改变过的文件重新编译，以节省编译时间。高集成的编辑器调整C和DSP汇编代码：CCS2000的内建编辑器支持C和汇编文件的动态语法加亮显示。使用户能很容易地

6、阅读代码和当场发现语法错误,对编辑和调试时的后台编辑：用户在使用编译器和汇编器时没有必要退出系统到DOS环境中，因为CCS2000会自动将这些工具装载在它的环境中。在其窗口中，错误会加亮显示只要双击错误就可以直接到达出错处。PDM允许将命令传播给所有的或所选择的处理器。在任何算法点观察信号的图形窗口探针，图形显示窗口使用户能够观察时域或频域内的信号。2.插上2407主控板的DSP实验箱；（仿真器模块，显示控制模块，DSP评估板模块，行列式键盘模块） ICETEK-LF2407-A板是一块很独立的目标板，它非常适合检验LF2407DSP的性能，此外，本目标板提供了LF240x系列芯片进行扩展和运

7、行软件的标准平台。   ICETEK-LF2407-A板使用了TMS320LF2407DSP芯片，兼容所有LF2407的使用代码，它具有2.5K字节的片上数据存储器，128K板上存储器，片上UART，DAC7625模数转换器。此EVM板还提供了DSP的扩展引脚，方便了用户外搭所需电路。   许多用户接口可利用简单的代码进行扩展，从而缩短了调试时间。  ICETEK-LF2407-A 板功能：     它主要的接口包括目标存储器接口、模拟接口、CAN总线接口、并口、用

8、户指示灯和开关、外部扩展接口。      LF2407提供了128K的静态存储器，外部I/O口支持相应的64k I/O端口，片上的CAN总线和RS232端口可用做扩展连接。 3.DSP硬件仿真器。三、实验原理实验箱上提供一个4x4的行列式键盘。2407的8个I/O口与之相连，这里按键的识别方法是扫描法。键被按下时，与此键相连的行线电平将由与此键相连的列线电平决定，而行线的电平在无按键按下时处于高电平状态。如果让所有的列线也处于高电平，那么键按下与否不会引起行线电平的状态变化，始终为高电平。所以，让所有的列线处于高电平是无法识

9、别出按键的。现在反过来，让所有的列线处于低电平，很明显，按键所在的行电平将被拉成低电平。根据此行电平的变化，便能判断此行一定有按键被按下，但还不能确定是哪个键被按下。假如是5键按下，为了进一步判定是哪一列的键被按下，可在某一时刻只让一条列线处于低电平，而其余列线处于高电平。那么，按下键的那列电平就会拉成低电平，判断出哪列为低电平就可以判断出按键号码。读者可以通过下面的键位去加深理解其含义实验流程图：由图可知，插上2407主控板的DSP实验箱的主芯片扫描矩阵键盘模块，矩阵键盘按键返回数据给实验箱主控制芯片，再由DSP芯片控制液晶显示模块，输入数据到液晶显示模块，然后完成实验流程，按下矩阵键盘的任

10、意一个按键都能显示相对应的数据。四、实验步骤1把2407模块小板插到大板上电脑显示会要安装驱动，按照流程安装好驱动；打开液晶模块的电源开关；2在CCS2000环境中打开本实验的工程编译(.keyzkey.pjt) ，生成输出文件，通过仿真器把执行代码(.out的文件)下载到DSP芯片； 2 运行;按下键盘按键，液晶会显示所按键的号码。 4.调试及性能分析 点击“运行”按键，进行仿真，点击右边4*4按键，则数码管显示0F，仿真结果符合实验要求。 5.系统实现的功能基本功能：通过键盘输入，在LCD液晶显示屏上显示相应的数值；功能优势：键盘输入，插上2407主控板的DSP实验箱控制，LCD液晶显示屏

11、显示。5、 程序r16 .set 280hr17 .set 282hr18 .set 284hr21 .set 286hr22 .set 288h ;r22 为调用显示一次的列数r23 .set 28ah ;r24显示起始页 r24 .set 28ch ;r24显示起始列r25 .set 28eh ;r25显示结束页r26 .set 290hkeydata .set 292h ;存放键值rowdata .set 294h ;存放行数scandata .set 296h ;存放扫描值keybuffer .set 298h ;读写键值缓冲dp_user .set 5hkeydata1 .set 2

12、9ahlcdtab .set 29chlcddata .set 29ehpbdatdir .set 709ah dp_pf2 .set 0e1hpadatdir .set 7098hpcdatdir .set 709chmcra .set 7090hmcrb .set 7092hmcrc .set 7094hpedatdir .set 7095hpfdatdir .set 7096h;以F口的低四位为输出，C口的7，6，5，0为输入，调试以通 .data tab00:;- 文字: E -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,007H,0

13、06H,004H,004H,004H,004H,004H,004H,004H,007H,007H,004H,004H,000H .word 000H,0C0H,080H,000H,01FH,007H,002H,002H,002H,002H,002H,0FFH,0FFH,000H,000H,000H .word 000H,006H,001H,000H,0C0H,000H,000H,000H,000H,000H,000H,0FFH,0FFH,000H,000H,000H .word 000H,000H,0C0H,0C0H,040H,040H,040H,040H,040H,040H,040H,0C0

14、H,0C0H,040H,040H,000Htab01:;- 文字: 0 -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,000H,001H,003H,006H,004H,004H,004H,006H,003H,001H,000H,000H,000H,000H .word 000H,01FH,0FFH,0C0H,000H,000H,000H,000H,000H,000H,000H,0E0H,0FFH,01FH,000H,000H .word 000H,0F0H,0FEH,007H,001H,000H,000H,000H,000H,000H,001

15、H,00FH,0FEH,0F0H,000H,000H .word 000H,000H,000H,000H,080H,0C0H,040H,040H,040H,0C0H,080H,000H,000H,000H,000H,000Htab02:;- 文字: F -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,007H,006H,006H,004H,004H,004H,004H,004H,004H,004H,007H,007H,004H,004H,000H .word 0C0H,080H,000H,01FH,007H,002H,002H,002H,002H,002

16、H,002H,0FFH,0FFH,000H,000H,000H .word 000H,000H,000H,0C0H,000H,000H,000H,000H,000H,000H,000H,0FFH,0FFH,000H,000H,000H .word 000H,000H,000H,000H,000H,000H,000H,000H,000H,040H,040H,0C0H,0C0H,040H,040H,000Htab03:;- 文字: D -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,000H,001H,003H,002H,006H,004H,004

17、H,004H,004H,007H,007H,004H,004H,000H .word 000H,01FH,0FFH,0E0H,000H,000H,000H,000H,000H,000H,000H,0FFH,0FFH,000H,000H,000H .word 000H,0F0H,0FCH,00FH,001H,000H,000H,000H,000H,000H,000H,0FFH,0FFH,000H,000H,000H .word 000H,000H,000H,000H,080H,080H,0C0H,040H,040H,040H,040H,0C0H,0C0H,040H,040H,000Htab04:

18、;- 文字: 7 -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,006H,007H,006H,006H,006H,006H,006H,006H,006H,007H,007H,001H,000H,000H .word 000H,000H,000H,000H,0C0H,030H,00CH,003H,000H,000H,000H,000H,080H,0E0H,000H,000H .word 000H,000H,000H,000H,000H,000H,000H,080H,07FH,00FH,000H,000H,000H,000H,000H,000H

19、.word 000H,000H,000H,000H,000H,000H,000H,000H,0C0H,0C0H,000H,000H,000H,000H,000H,000Htab05:;- 文字: 8 -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,000H,001H,003H,006H,004H,004H,004H,004H,006H,003H,001H,000H,000H,000H .word 000H,000H,0F0H,0F8H,00CH,003H,003H,003H,003H,006H,00FH,01DH,0F8H,0F0H,000H,

20、000H .word 000H,000H,03EH,07FH,0E1H,0C0H,080H,000H,000H,000H,000H,080H,0C1H,07FH,03EH,000H .word 000H,000H,000H,000H,080H,080H,040H,040H,040H,040H,040H,080H,080H,000H,000H,000Htab06:;- 文字: 9 -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,000H,000H,001H,002H,004H,004H,004H,004H,004H,002H,003H,001H,

21、000H,000H .word 000H,000H,03FH,0FFH,083H,001H,000H,000H,000H,000H,000H,000H,081H,0FFH,07EH,000H .word 000H,000H,0E0H,0FCH,01EH,083H,081H,040H,040H,040H,040H,0C0H,083H,003H,000H,000H .word 000H,000H,000H,000H,000H,000H,080H,0C0H,040H,040H,040H,040H,080H,080H,000H,000Htab07:;- 文字: C -;- 宋体24; 此字体下对应的点

22、阵为：宽x高=16x32 - .word 000H,000H,007H,003H,002H,004H,004H,004H,004H,006H,002H,001H,000H,000H,000H,000H .word 000H,060H,080H,000H,000H,000H,000H,000H,000H,000H,000H,080H,0E0H,07FH,00FH,000H .word 000H,00CH,003H,001H,000H,000H,000H,000H,000H,000H,000H,001H,00FH,0FEH,0F0H,000H .word 000H,000H,000H,080H,0

23、80H,040H,040H,040H,040H,040H,080H,080H,000H,000H,000H,000Htab08:;- 文字: 4 -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,000H,000H,007H,007H,003H,000H,000H,000H,000H,000H,000H,000H,000H,000H .word 000H,000H,000H,000H,0FFH,0FFH,0FFH,080H,060H,018H,00CH,003H,000H,000H,000H,000H .word 000H,010H,010H,0

24、10H,0FFH,0FFH,0FFH,010H,010H,010H,010H,010H,090H,070H,010H,000H .word 000H,020H,020H,020H,0E0H,0E0H,0E0H,020H,020H,020H,000H,000H,000H,000H,000H,000Htab09:;- 文字: 5 -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,006H,006H,006H,006H,006H,006H,006H,006H,006H,007H,000H,000H,000H,000H .word 000H,000H,0

25、00H,003H,006H,00CH,008H,008H,008H,008H,004H,0C2H,03FH,000H,000H,000H .word 000H,000H,0FCH,0FFH,003H,000H,000H,000H,000H,000H,000H,000H,00CH,00FH,000H,000H .word 000H,000H,000H,000H,080H,080H,040H,040H,040H,040H,040H,040H,080H,000H,000H,000Htab10:;- 文字: 6 -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,0

26、00H,001H,003H,004H,004H,004H,004H,006H,002H,001H,000H,000H,000H,000H,000H .word 000H,000H,081H,083H,006H,004H,004H,004H,004H,002H,003H,0E1H,07FH,00FH,000H,000H .word 000H,0FCH,0FFH,001H,000H,000H,000H,000H,000H,000H,001H,087H,0FEH,0F8H,000H,000H .word 000H,000H,000H,080H,080H,040H,040H,040H,040H,0C0

27、H,080H,000H,000H,000H,000H,000Htab11:;- 文字: B -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,001H,003H,003H,006H,004H,004H,004H,004H,004H,007H,007H,004H,004H,000H .word 000H,000H,0F0H,0F9H,00DH,006H,002H,002H,002H,002H,002H,0FFH,0FFH,000H,000H,000H .word 000H,03EH,0FFH,081H,000H,000H,000H,000H,000

28、H,000H,000H,0FFH,0FFH,000H,000H,000H .word 000H,000H,000H,080H,0C0H,040H,040H,040H,040H,040H,040H,0C0H,0C0H,040H,040H,000Htab12:;- 文字: 1 -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,000H,000H,000H,000H,000H,007H,003H,001H,001H,001H,001H,000H,000H,000H .word 000H,000H,000H,000H,000H,000H,000H,0FF

29、H,0FFH,000H,000H,000H,000H,000H,000H,000H .word 000H,000H,000H,000H,000H,000H,000H,0FFH,0FFH,000H,000H,000H,000H,000H,000H,000H .word 000H,000H,000H,040H,040H,040H,0C0H,0C0H,0C0H,0C0H,040H,040H,040H,000H,000H,000Htab13:;- 文字: 2 -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,000H,003H,003H,006H,004

30、H,004H,004H,004H,004H,002H,001H,000H,000H,000H .word 000H,000H,0F8H,0FCH,006H,001H,000H,000H,000H,000H,000H,000H,030H,0F0H,000H,000H .word 000H,000H,00FH,001H,000H,000H,080H,040H,020H,010H,008H,004H,002H,001H,000H,000H .word 000H,000H,000H,0C0H,0C0H,0C0H,0C0H,0C0H,0C0H,0C0H,0C0H,0C0H,0C0H,0C0H,000H,

31、000Htab14:;- 文字: 3 -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,000H,000H,003H,003H,006H,004H,004H,004H,004H,002H,003H,001H,000H,000H .word 000H,000H,000H,0F0H,0F9H,00DH,007H,002H,002H,002H,000H,000H,0E0H,0E0H,000H,000H .word 000H,000H,03CH,0FFH,081H,000H,000H,000H,000H,000H,000H,000H,00FH,00FH,

32、000H,000H .word 000H,000H,000H,000H,080H,080H,040H,040H,040H,040H,040H,080H,080H,000H,000H,000Htab15:;- 文字: A -;- 宋体24; 此字体下对应的点阵为：宽x高=16x32 - .word 000H,000H,000H,000H,000H,000H,000H,00FH,007H,007H,000H,000H,000H,000H,000H,000H .word 000H,000H,000H,000H,000H,007H,07FH,0F8H,000H,0C0H,07CH,007H,000H,

33、000H,000H,000H .word 000H,000H,000H,003H,07FH,0FCH,0C0H,040H,040H,040H,040H,0C0H,07CH,007H,000H,000H .word 000H,040H,040H,0C0H,0C0H,040H,000H,000H,000H,000H,000H,040H,040H,0C0H,0C0H,040H .include "240xa.inc" .def _c_int0 .text_c_int0 setc INTM clrc SXM clrc OVM clrc CNF ldp #0e0h splk #0e8

34、h,WDCR ldp #0 splk #0h,IMR splk #0ffffh,IFR ldp #dp_user splk#0FFFH,r22 out r22,WSGR ldp #dp_pf2 lacl #00h sacl mcra ;初始化mcra,定义a的0，1口为i/o lacl mcrb lacl #0ff00h sacl mcrb ;初始化mcrb,定义c 的2,3,4口为i/o lacl #000h sacl mcrc ;初始化mcrc,定义e口为i/o nop ldp #5 lacl #0 sacl lcdtab sacl keydata ;long1: lacl #0ff00h

35、 ldp #0e1h sacl PADATDIR ;a的0,1口输出且为0 rpt #20 ;延时 nop lacl #0ff00h sacl PCDATDIR ;c的2,3,4口输出且为0 rpt #20 nop lacl #0ff00h sacl pedatdir ;c的2,3,4口输出且为0 rpt #20 nop ldp #dp_user splk #3eh,r16 ;关液晶显示3e call write_ins0 rpt #100 nop rpt #100 nop rpt #100 nop ldp #dp_user splk #3fh,r16 ;开液晶显示3f call write_

36、ins0 call write_ins1 rpt #100 nop rpt #100 nop ; B long100l1: ldp #dp_user splk #0c0h,r16 ;起始行对应行 call write_ins0 noplong2: ldp #dp_user splk #0bfh,r16 ;确定初始页;call write_ins0 call write_ins0 ldp #dp_user splk #40h,r16 ;确定初始列 call write_ins0 ldp #dp_user call display_cs0 call display_cs1 ;键盘扫描开始 long

37、100: ;call display_cs0 scan_again: call scan_key ;调用函数，得到对应数的(数)*16作地址偏移用 lacl keydata bcnd long100,eq lacl #0ff00h ldp #0e1h sacl PADATDIR ;a的0,1口输出且为0 rpt #20 ;延时 nop lacl #0ff00h sacl PCDATDIR ;c的2,3,4口输出且为0 rpt #20 nop lacl #0ff00h sacl pedatdir ;c的2,3,4口输出且为 ;call display_cs0 lacl #0h ldp #5h s

38、acl lcdtab ;lcdtab的作用是放取数的地址值 lacc #0 mar *,ar5 ldp #5h lacl keydata sub #01h sacl keydata lar ar5,keydata lar ar0,#00h ;sacl lcdtab lacl #00lay1: LACL lcdtab add #64 sacl lcdtab sbrk #1h nop cmpr 00 bcnd lay1,NTC sacl lcdtab; ;显示一个数 long35: ldp #dp_user splk #10h,r22 ;r22 为调用显示一次的列数 ldp #dp_user sp

39、lk #0beh,r23 ;r23显示起始页 ldp #dp_user splk #70h,r24 ;r24显示起始列 ldp #dp_user splk #0bbh,r25 ;r25显示结束页 lacc lcdtab add #tab00 ;取第一行的地址数 sacl lcdtab call display4 ;显示第一个字 ldp #dp_user ;* ldp #dp_user splk #10h,r22 ;r22 为调用显示一次的列数 ldp #dp_user splk #0beh,r23 ;r23显示起始页 ldp #dp_user splk #60h,r24 ;r24显示起始列 l

40、dp #dp_user splk #0bbh,r25 ;r25显示结束页 lacc lcdtab add #tab00 ;取第一行的地址数 sacl lcdtab call display4 ;显示第一个字 ldp #dp_user ;* * long4: b scan_again;扫描程序;scan_key: lacl #0ff00h ldp #0e1h sacl pfdatdir ;a的0,1口输出且为0 rpt #20 ;延时 nop lacl #000h sacl pcdatdir ;c的2,3,4口输出且为0 rpt #20 nop lacl #0ff00h sacl pedatdi

41、r ;c的2,3,4口输出且为 ldp #dp_user lacl #00h sacl keydata ;初始化键值 lacl #04h sacl rowdata ;初始化行数 ;lacl #0ffefh lacl #0fff7h ; sacl scandata ;初始化扫描值 LDP #0e1hmmm: lacl #0ff00h ; sacl pfdatdir ;高8位送全0 nop lacl pcdatdir nop ldp #5h sacl keybuffer and #0ffh ;屏蔽高4位 or #1eh xor #0ffh ;检查是否有键按下 bcnd scanout ,eq ;无

42、键按下则退出扫描scan: ldp #5h ;输出扫描值 lacl scandata ldp #0e1h sacl pfdatdir nop lacl pcdatdir nop and #0ffh ;屏蔽高4位 or #1eh xor #0ffh ;检查该列是否有键按下 bcnd scannext,eq ldp #dp_user bit keybuffer,15 bcnd key1,tc ;判断是否该行的第一个键 ldp #5h lacl keydata add #01h sacl keydata b scanoutkey1: bit keybuffer,10 bcnd key2,tc lacl keydata ;判断是否该行的第二个键 add #02h sacl keydata b scanoutkey2: bit keybuffer,9 ;判断是否该行的第三个键 bcnd key3,tc lacl keydata add #03h sacl keydata nop b scanoutkey3: bit keybuffer,8 ;判断是否该行的第四个键 bcnd scanout,tc lacl keydata add #04h sacl keydata b scanout scannext: ldp #dp_