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DSP设计报告
----液晶显示
学院：物信学院
专业：电子信息科学与技术 班级：11电信一班 姓名：何得中 学号：20111060108
一、引言
简单地说，数字信号处理就是用数值计算的方式对信号进行加工的理论和技术，它的英文原名叫digital signal proceing，简称DSP。另外DSP也是digital signal proceor的简称，即数字信号处理器，它是集成专用计算机的一种芯片，只有一枚硬币那么大。有时人们也将DSP看作是一门应用技术，称为DSP技术与应用。《DSP》这门课介绍的是：将事物的运动变化转变为一串数字，并用计算的方法从中提取有用的信息，以满足我们实际应用的需求。本次课程设计主要采用TI公司的DSP芯片TMS320F2812A驱动液晶显示模块RT12864J，在CCS2软件平台上，实现静态图片的显示。
关键词：DSP；LCD12864；C语言
二、设计目的1.加深对DSP技术的理解，掌握液晶显示的工作原理； 2.了解如何驱动液晶模块，从而实现字符、图片的显示； 3.培养自主学习、正确分析和解决问题的能力。
三、设计内容
1.简单设计一个驱动程序，使得LCD12864模块在DSP芯片的驱动下，可以任意显示一张128*64的图片。
2.利用C编程语言编写合适的能实现1中要求的基本具体功能的语言程序。
四、功能介绍
静态显示一张128*64的图片。
五、基本原理
1.液晶控制引脚
命令控制接口的地址为0x108001，数据控制接口的地址为0x108003和0x108004，辅助控制接口的地址为0x108002。
2.液晶控制命令
开显示：0x3f
设置操作页：0xb8+页号
设置显示起始行：0xc0+行号 设置操作列：0x40+列号
3．液晶显示原理
液晶显示模块中有两片显示缓冲存储器，分别对应屏幕显示的像素，向其中写入数值将改变显示，写入“1”则显示一点，写入“0”则不显示。其地址与像素的对应方式如下:
4.数据传送
由于液晶显示模块相对运行在高主频下的DSP属于较为慢速设备，连接时需要考虑数据线上信号的等待问题；电平转换：由于DSP为3.3V设备，而液晶显示模块属于5V设备，所以在连接控制线、数据线时需要加电平隔离和转换设备，如：ICETEK-CTR板上使用了74LS245。
5.程序流程图
六、设计实现
1.查阅资料熟悉C语言并了解实验目的编写如下程序：
#include “DSP281x_Device.h” // DSP281x Headerfile Include File #include “DSP281x_Examples.h” // DSP281x Examples Include File #include “f2812a.h”
#define uint unsigned int #define uchar unsigned char
#define CTRGR *(int *)0x108000
//全局控制寄存器 #define CTRLCDCMDR *(int *)0x108001 //液晶命令控制寄存器 #define CTRLCDCR *(int *)0x108002 //液晶控制寄存器
#define CTRLCDLCR *(int *)0x108003 //液晶左半屏控制寄存器 #define CTRLCDRCR *(int *)0x108004 //液晶右半屏控制寄存器 #define CTRLA *(int *)0x108005
//发光二极管控制寄存器 #define CTRLR *(int *)0x108007
//辅助控制寄存器
uchar map[]={ 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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, };void Delay(uint xx)// 延时子程序 { while(xx--);}
void TurnOnLCD()
// 打开显示 { CTRLCDCMDR=0x3f;
//打开显示
Delay(10);
CTRLCDCR=0;Delay(2048);}
void LCDCLS()
{ int i,j;CTRLCDCMDR=0xc0;
Delay(10);
CTRLCDCR=0;Delay(10);
for(i=0;i
CTRLCDCMDR=0xb8+i;
Delay(10);
CTRLCDCR=0;
Delay(10);
CTRLCDCMDR=0x40;
Delay(10);
CTRLCDCR=0;
Delay(10);
for(j=0;j
{
CTRLCDLCR=0;
Delay(10);
CTRLCDCR=0;
Delay(10);
}
CTRLCDCMDR=0xb8+i;
Delay(10);
CTRLCDCR=0;
Delay(10);
CTRLCDCMDR=0x40;
Delay(10);
CTRLCDCR=0;
Delay(10);
for(j=0;j
{
CTRLCDRCR=0;
Delay(10);
// 清除屏幕显示内容//设置显示起始行 //设置操作页 //设置操作列 //设置操作页 //设置操作列
CTRLCDCR=0;
Delay(10);
} } }
void lcdinit(){ CTRGR=0x80;// 初始化ICETEK-CTR Delay(10);
CTRGR=0x0;Delay(10);
CTRGR=0x80;Delay(10);
CTRLA=0;
// 关闭东西方向的交通灯
Delay(10);
CTRLR=0x40;// 关闭南北方向的交通灯
Delay(10);
TurnOnLCD();// 打开显示
LCDCLS();
// 清除显示内存 }
void disp_picture(uchar *img){ int j,k,n;CTRLCDCMDR=0xc0;
// 设置显示起始行
Delay(10);
CTRLCDCR=0;Delay(10);
for(j=0;j
for(k=0;k
{
CTRLCDCMDR=0xb8+k;// 设置操作页
Delay(10);
CTRLCDCR=0;
Delay(10);
CTRLCDCMDR=0x40+j;// 设置显示起始列
Delay(10);
CTRLCDCR=0;
Delay(10);
CTRLCDLCR=img[n];
n++;
Delay(10);
CTRLCDCR=0;
Delay(10);
}
}
for(j=0;j
for(k=0;k
{
CTRLCDCMDR=0xb8+k;
Delay(10);
CTRLCDCR=0;
Delay(10);
CTRLCDCMDR=0x40+j;
Delay(10);
CTRLCDCR=0;
Delay(10);
CTRLCDRCR=img[n];
n++;
Delay(10);
CTRLCDCR=0;
Delay(10);
}
}
}
void main(void){ InitSysCtrl();lcdinit();disp_picture(map);}
// 设置操作页
// 设置显示起始列
2将程序下载到既定的实验板上运行；
3进行实验的调试让实验板上的液晶模块与所要实现的功能匹配； 4撰写设计报告。
七、心得体会
本次设计总共经历了一个星期，时间不长,但对我而言收获颇多。每天都在自己的设计进度上向前思考，思考下一步该怎么实现，遇到的问题该怎么解决，感觉这一周很压抑却也很充实。回想现在，每次自己克服一个技术性难关时，是多么的开心，尤其第一次看到实验板上的液晶模块显示字符时的感受，现在仍然记忆犹新。虽然最后设计只完成了最最基本的绘图功能，还有其他的一些功能未能来得及实现，但心里依旧充满了成就感。通过这次设计，一方面让我更进一步认识了DSP特点，另一方面也巩固了我的编程方面的能力，同时大大增强了我的自信心。我也总结了许多我还应该改进的地方，多查资料，多思考，对解决问题起到帮助性作用。面对困难，要知难而进；另外要学会淡定从容面对挑战，在动手实践的过程中一定要专心致志心无旁骛，这样才会有所收获。这次设计让我学到了了许多书本上学不到的知识，使我受益匪浅。
八、参考文献
《手把手教你学DSP》 北京航空航天大学出版社 《C程序设计》
清华大学出版社
《ICETEK-F2812-A-S60-V2.2》
《RT12864系列点阵型LCM使用说明书》
九、附录
硬件原理图
硬件仿真截图：
