第71节：液晶屏的字符，16点阵，24点阵和32点阵的显示程序

这一节要教会大家二个知识点：

第一个：如何利用任意点阵字体显示函数display_lattice来显示8x16的字符，16点阵汉字，24点阵汉字和32点阵汉字。

第二个：纠正上一节的一个小错误。C51编译器跟其它单片机的编译器有点不一样。想把常量数据保存在ROM程序存储区里并不是用const关键字，而是是用code关键字。

具体内容，请看源代码讲解。

(1)硬件平台：

基于朱兆祺51单片机学习板。

(2)实现功能：开机上电后，可以看到液晶屏分别显示32点阵，24点阵和16点阵的“馒头”两个字，还有“V5”这两个8x16点阵的字符。

(3)源代码讲解如下：

#include "REG52.H"

sbit LCDCS_dr = P1^6; //片选线

sbit LCDSID_dr = P1^7; //串行数据线

sbit LCDCLK_dr = P3^2; //串行时钟线

sbit LCDRST_dr = P3^4; //复位线

void SendByteToLcd(unsigned char ucData); //发送一个字节数据到液晶模块

void SPIWrite(unsigned char ucWData, unsigned char ucWRS); //模拟SPI发送一个字节的命令或者数据给液晶模块的底层驱动

void WriteCommand(unsigned char ucCommand); //发送一个字节的命令给液晶模块

void LCDWriteData(unsigned char ucData); //发送一个字节的数据给液晶模块

void LCDInit(void); //初始化 函数内部包括液晶模块的复位

void display_lattice(unsigned int x,unsigned int y,const unsigned char *ucArray,unsigned char ucFbFlag,unsigned int x_amount,unsigned int y_amount); //显示任意点阵函数

void display_clear(void); // 清屏

void delay_short(unsigned int uiDelayshort); //延时

/* 注释一：

* 纠正上一节的一个小错误。C51编译器跟其它的编译器有点不一样。

* 存在ROM程序存储区里的常量数据并不是用const关键字，而是是用code关键字。

*/

code unsigned char Hz3232_man[]= /*馒 横向取模 32x32点阵 */

{

0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x06,0x07,0x03,0x00,0x0F,0x87,0xFF,0x80,

0x0F,0x07,0x03,0x80,0x0E,0x07,0x03,0x80,0x0E,0x37,0xFF,0x80,0x1C,0x7F,0x03,0x80,

0x1F,0xFF,0x03,0x80,0x18,0x77,0xFF,0x00,0x38,0xE0,0x00,0xC0,0x36,0xDF,0xFF,0xF0,

0x77,0x9C,0xCE,0xE0,0x67,0x1C,0xCE,0xE0,0xC7,0x1C,0xCE,0xE0,0x07,0x1C,0xCE,0xE0,

0x07,0x1F,0xFF,0xE0,0x07,0x18,0x00,0x00,0x07,0x00,0x03,0x80,0x07,0x0F,0xFF,0xC0,

0x07,0x71,0x8F,0x00,0x07,0xE0,0xDE,0x00,0x07,0xC0,0xFC,0x00,0x07,0x80,0x78,0x00,

0x0F,0x01,0xFE,0x00,0x07,0x03,0x8F,0xE0,0x00,0x1E,0x03,0xF0,0x00,0xF8,0x00,0x00,

0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

};

code unsigned char Hz3232_tou[]= /*头 横向取模 32x32点阵 */

{

0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0xC0,0x00,0x00,0x03,0xE0,0x00,

0x03,0xC3,0xC0,0x00,0x00,0xF3,0x80,0x00,0x00,0x7B,0x80,0x00,0x00,0x7B,0x80,0x00,

0x00,0x3B,0x80,0x00,0x0E,0x03,0x80,0x00,0x07,0x83,0x80,0x00,0x03,0xC3,0x80,0x00,

0x01,0xE3,0x80,0x00,0x01,0xE3,0x80,0x00,0x00,0xC3,0x80,0x00,0x00,0x03,0x81,0xE0,

0x7F,0xFF,0xFF,0xF0,0x00,0x07,0x80,0x30,0x00,0x07,0x00,0x00,0x00,0x07,0x80,0x00,

0x00,0x0E,0xE0,0x00,0x00,0x1E,0x7C,0x00,0x00,0x3C,0x1F,0x00,0x00,0x78,0x0F,0xC0,

0x00,0xF0,0x03,0xC0,0x03,0xC0,0x01,0xE0,0x0F,0x00,0x00,0xE0,0x78,0x00,0x00,0x00,

0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

};

code unsigned char Hz2424_man[]= /*馒 横向取模 24x24点阵 */

{

0x00,0x00,0x00,0x00,0x00,0x00,0x0C,0x18,0x30,0x1E,0x1F,0xF8,0x1C,0x1C,0x38,0x1C,

0x1F,0xF8,0x19,0xFC,0x38,0x3F,0xFF,0xF8,0x31,0x98,0x30,0x7B,0xE0,0x0E,0x6F,0x7F,

0xFE,0x6E,0x76,0xEE,0xCC,0x76,0xEE,0x0C,0x7F,0xFE,0x0C,0x70,0x0C,0x0C,0x00,0x38,

0x0C,0x3F,0xF8,0x0D,0xCE,0x70,0x0F,0x87,0xE0,0x0F,0x03,0x80,0x1E,0x07,0xE0,0x0C,

0x1C,0x7E,0x01,0xF0,0x1F,0x00,0x00,0x00,

};

code unsigned char Hz2424_tou[]= /*头 横向取模 24x24点阵 */

{

0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0E,0x00,0x06,0x0F,0x00,0x07,0x8E,0x00,0x01,

0xEE,0x00,0x00,0xEE,0x00,0x00,0xEC,0x00,0x1C,0x0C,0x00,0x0F,0x0C,0x00,0x07,0x9C,

0x00,0x03,0x9C,0x00,0x00,0x1C,0x0C,0x00,0x1C,0x1E,0x7F,0xFF,0xF6,0x00,0x1C,0x00,

0x00,0x3C,0x00,0x00,0x3F,0x80,0x00,0x71,0xE0,0x00,0xE0,0xF8,0x01,0xC0,0x3C,0x07,

0x00,0x1C,0x3C,0x00,0x0C,0x70,0x00,0x00,

};

code unsigned char Hz1616_man[]= /*馒 横向取模 16X16点阵 */

{

0x21,0xF8,0x21,0x08,0x21,0xF8,0x3D,0x08,0x45,0xF8,0x48,0x00,0x83,0xFC,0x22,0x94,

0x23,0xFC,0x20,0x00,0x21,0xF8,0x20,0x90,0x28,0x60,0x30,0x90,0x23,0x0E,0x00,0x00,

};

code unsigned char Hz1616_tou[]= /*头 横向取模 16X16点阵 */

{

0x00,0x80,0x10,0x80,0x0C,0x80,0x04,0x80,0x10,0x80,0x0C,0x80,0x08,0x80,0x00,0x80,

0xFF,0xFE,0x00,0x80,0x01,0x40,0x02,0x20,0x04,0x30,0x08,0x18,0x10,0x0C,0x20,0x08,

};

code unsigned char Zf816_V[]= /*V 横向取模 8x16点阵 */

{

0x00,0x00,0x00,0xE7,0x42,0x42,0x44,0x24,0x24,0x28,0x28,0x18,0x10,0x10,0x00,0x00,

};

code unsigned char Zf816_5[]= /*5 横向取模 8x16点阵 */

{

0x00,0x00,0x00,0x7E,0x40,0x40,0x40,0x58,0x64,0x02,0x02,0x42,0x44,0x38,0x00,0x00,

};

void main()

{

LCDInit(); //初始化12864 内部包含液晶模块的复位

display_clear(); // 清屏

display_lattice(0,0,Hz3232_man,0,4,32); //显示32点阵的<馒>字

display_lattice(2,0,Hz3232_tou,0,4,32); //显示32点阵的<头>字

display_lattice(4,0,Hz2424_man,0,3,24); //显示24点阵的<馒>字

display_lattice(6,0,Hz2424_tou,0,3,24); //显示24点阵的<头>字

display_lattice(8,0,Hz1616_man,0,2,16); //显示16点阵的<馒>字

display_lattice(9,0,Hz1616_tou,0,2,16); //显示16点阵的<头>字

display_lattice(11,0,Zf816_V,0,1,16); //显示8x16点阵的字符

display_lattice(12,0,Zf816_5,0,1,16); //显示8x16点阵的<5>字符

while(1)

{

;

}

}

void display_clear(void) // 清屏

{

unsigned char x,y;

WriteCommand(0x34); //关显示缓冲指令

WriteCommand(0x34); //关显示缓冲指令 故意写2次，怕1次关不了 这个是因为我参考到某厂家的驱动程序也是这样写的

y=0;

while(y<32) //y轴的范围0至31

{

WriteCommand(y+0x80); //垂直地址

WriteCommand(0x80); //水平地址

for(x=0;x<32;x++) //256个横向点，有32个字节

{

LCDWriteData(0x00);

}

y++;

}

WriteCommand(0x36); //开显示缓冲指令

}

/* 注释二：本节的核心函数，读者尤其要搞懂x_amount和y_amount对应的显示关系。

* 第1，2个参数x,y是坐标体系。x的范围是0至15，y的范围是0至31.

* 第3个参数*ucArray是字模的数组。

* 第4个参数ucFbFlag是反白显示标志。0代表正常显示，1代表反白显示。

* 第5，6个参数x_amount，y_amount分别代表字模数组的横向有多少个字节，纵向有几横。

*/

void display_lattice(unsigned int x,unsigned int y,const unsigned char *ucArray,unsigned char ucFbFlag,unsigned int x_amount,unsigned int y_amount)

{

unsigned int j=0;

unsigned int i=0;

unsigned char ucTemp;

WriteCommand(0x34); //关显示缓冲指令

WriteCommand(0x34); //关显示缓冲指令 故意写2次，怕1次关不了 这个是因为我参考到某厂家的驱动程序也是这样写的

for(j=0;j

{

WriteCommand(y+j+0x80); //垂直地址

WriteCommand(x+0x80); //水平地址

for(i=0;i

{

ucTemp=ucArray[j*x_amount+i];

if(ucFbFlag==1) //反白显示

{

ucTemp=~ucTemp;

}

LCDWriteData(ucTemp);

// delay_short(30000); //把上一节这个延时函数去掉，加快刷屏速度

}

}

WriteCommand(0x36); //开显示缓冲指令

}

void SendByteToLcd(unsigned char ucData) //发送一个字节数据到液晶模块

{

unsigned char i;

for ( i = 0; i < 8; i++ )

{

if ( (ucData << i) & 0x80 )

{

LCDSID_dr = 1;

}

else

{

LCDSID_dr = 0;

}

LCDCLK_dr = 0;

LCDCLK_dr = 1;

}

}

void SPIWrite(unsigned char ucWData, unsigned char ucWRS) //模拟SPI发送一个字节的命令或者数据给液晶模块的底层驱动

{

SendByteToLcd( 0xf8 + (ucWRS << 1) );

SendByteToLcd( ucWData & 0xf0 );

SendByteToLcd( (ucWData << 4) & 0xf0);

}

void WriteCommand(unsigned char ucCommand) //发送一个字节的命令给液晶模块

{

LCDCS_dr = 0;

LCDCS_dr = 1;

SPIWrite(ucCommand, 0);

delay_short(90);

}

void LCDWriteData(unsigned char ucData) //发送一个字节的数据给液晶模块

{

LCDCS_dr = 0;

LCDCS_dr = 1;

SPIWrite(ucData, 1);

}

void LCDInit(void) //初始化 函数内部包括液晶模块的复位

{

LCDRST_dr = 1; //复位

LCDRST_dr = 0;

LCDRST_dr = 1;

}

void delay_short(unsigned int uiDelayShort) //延时函数

{

unsigned int i;

for(i=0;i

{

;

}

}

总结陈词：

我们现在讲的字体显示都是横向的，如果某个项目要把整个液晶屏顺时针旋转90度，要求像对联一样纵向显示一串字体的时候，该怎么办?我前两个月就遇到了这样的项目，当时我的做法就是把字体的字库数组通过算法旋转90度就达到了目的。这种算法程序是怎样编写的?欲知详情，请听下回分解-----把字体顺时针旋转90度显示的算法程序。