这是用SPI方式来驱动12864液晶的源程序，液晶屏的控制芯片为ST7565P经测试SPI的时钟可达到振荡频率的二分频。比用普通IO口模拟串行的方式快多了。。。
下面贴出源代码，有详细注释。。。。
本程序简单实用，可拿去作简单参考。。。。
编译环境：GCC+AVR STUDIO
单片机：ATMEGA 8515
晶振： 3.6864M
#include //包含头文件
#include
#define COMMAND 1
#define DATA 0
/////////////////////////////////////////
//数据线定义：
// SI==========PB5 //
// A0==========PC0
// CS==========PC2
// RES=========PC1
// SCL=========PB7
//
/////////////////////////////////////////
unsigned char gushi[8][112]PROGMEM=
{
{0x10,0x10,0x92,0x92,0x92,0xF2,0x9E,0x92,0x92,0x92,0x92,0x92,0xFE,0x10,0x10,0x00, //君问归期未有期
0x00,0x00,0xF8,0x01,0x06,0xE0,0x22,0x22,0x22,0x22,0xE2,0x02,0x02,0xFE,0x00,0x00,
0x00,0xF8,0x00,0x00,0xFF,0x00,0x04,0x84,0x84,0x84,0x84,0x84,0x84,0xFC,0x00,0x00,
0x00,0x04,0xFF,0x54,0x54,0x54,0xFF,0x04,0x00,0xFE,0x22,0x22,0x22,0xFE,0x00,0x00,
0x40,0x40,0x48,0x48,0x48,0x48,0xC8,0xFF,0x48,0x48,0x48,0x48,0x48,0x40,0x40,0x00,
0x00,0x04,0x84,0x44,0xE4,0x34,0x2C,0x27,0x24,0x24,0x24,0xE4,0x04,0x04,0x04,0x00,
0x00,0x04,0xFF,0x54,0x54,0x54,0xFF,0x04,0x00,0xFE,0x22,0x22,0x22,0xFE,0x00,0x00},
{0x40,0x20,0x10,0x0C,0xFE,0x45,0x44,0x44,0x44,0x44,0x44,0x44,0xFD,0x00,0x00,0x00,
0x00,0x00,0xFF,0x00,0x00,0x03,0x02,0x02,0x02,0x02,0x03,0x40,0x80,0x7F,0x00,0x00,
0x00,0x87,0x40,0x30,0x0F,0x00,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x3F,0x00,0x00,
0x42,0x22,0x1B,0x02,0x02,0x0A,0x33,0x62,0x18,0x07,0x02,0x22,0x42,0x3F,0x00,0x00,
0x20,0x20,0x10,0x10,0x08,0x06,0x01,0xFF,0x01,0x02,0x04,0x08,0x18,0x30,0x10,0x00,
0x02,0x01,0x00,0x00,0xFF,0x09,0x09,0x09,0x29,0x49,0xC9,0x7F,0x00,0x00,0x00,0x00,
0x42,0x22,0x1B,0x02,0x02,0x0A,0x33,0x62,0x18,0x07,0x02,0x22,0x42,0x3F,0x00,0x00},
{0x00,0x00,0xFE,0x42,0x42,0x42,0x42,0x7E,0x42,0x42,0x42,0x42,0xFE,0x00,0x00,0x00, //巴山夜雨涨池
0x00,0x00,0xE0,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0xE0,0x00,0x00,
0x04,0x04,0x84,0xC4,0x3C,0x14,0x85,0x66,0xBC,0x24,0x24,0x24,0xE4,0x24,0x04,0x00,
0x02,0x02,0xF2,0x32,0x52,0x92,0x12,0xFE,0x32,0x52,0x92,0x12,0xF2,0x02,0x02,0x00,
0x10,0x61,0x86,0x60,0xF2,0x12,0x12,0x1E,0x80,0xFF,0xA0,0x90,0x88,0x86,0x80,0x00,
0x24,0x24,0xE4,0xFC,0xA2,0x22,0x22,0x80,0x70,0x00,0xFF,0x40,0x20,0x18,0x00,0x00,
0x10,0x60,0x02,0x8C,0x60,0x80,0xF8,0x40,0x40,0xFE,0x20,0x20,0x10,0xF0,0x00,0x00},
{0x00,0x00,0x3F,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x78,0x20,0x00,
0x00,0x20,0x7F,0x20,0x20,0x20,0x20,0x3F,0x20,0x20,0x20,0x20,0x20,0x7F,0x00,0x00,
0x02,0x01,0x00,0xFF,0x00,0x82,0x41,0x22,0x14,0x09,0x14,0x23,0x40,0xC0,0x40,0x00,
0x00,0x00,0xFF,0x01,0x02,0x04,0x00,0x7F,0x01,0x02,0x44,0x80,0x7F,0x00,0x00,0x00,
0x04,0xFC,0x03,0x00,0x01,0x41,0x81,0x7F,0x00,0xFF,0x42,0x0C,0x30,0x60,0x20,0x00,
0x02,0x01,0x00,0xFF,0x00,0x83,0x40,0x20,0x18,0x07,0x01,0x06,0x18,0xE0,0x40,0x00,
0x08,0x08,0x7C,0x03,0x00,0x00,0x3F,0x40,0x40,0x5F,0x40,0x42,0x44,0x43,0x70,0x00},
{0x80,0x40,0xF0,0x1C,0x07,0xE2,0x24,0x24,0x24,0xE4,0x04,0x04,0xFC,0x04,0x04,0x00, //何当共剪西窗烛
0x00,0x00,0x40,0x42,0x5C,0x48,0x40,0x40,0x7F,0x40,0x50,0x4E,0x44,0xC0,0x00,0x00,
0x00,0x10,0x10,0x10,0x10,0xFE,0x10,0x10,0x10,0x10,0xFE,0x10,0x10,0x10,0x00,0x00,
0x00,0x04,0xF4,0x54,0x55,0x56,0x54,0xF4,0x04,0x04,0xE6,0x05,0x04,0xF4,0x04,0x00,
0x02,0xF2,0x12,0x12,0x12,0xFE,0x12,0x12,0x12,0xFE,0x12,0x12,0x12,0xF2,0x02,0x00,
0x00,0x4C,0x44,0xE4,0x54,0x44,0x64,0xD5,0x46,0x44,0x4C,0x54,0xD4,0x24,0x2C,0x00,
0x80,0x60,0x00,0xFF,0x20,0x18,0xF0,0x10,0x10,0xFF,0x12,0x10,0xF0,0x10,0x00,0x00},
{0x00,0x00,0x7F,0x00,0x00,0x07,0x02,0x02,0x02,0x07,0x20,0x40,0x3F,0x00,0x00,0x00,
0x00,0x00,0x20,0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x7F,0x00,0x00,
0x02,0x02,0x82,0x42,0x32,0x1F,0x0A,0x02,0x02,0x06,0x0B,0x32,0xE2,0x42,0x02,0x00,
0x00,0x08,0x8F,0x89,0x49,0x2B,0x1D,0x0B,0x08,0x08,0x08,0x4A,0x8C,0x7B,0x00,0x00,
0x00,0x7F,0x28,0x24,0x22,0x21,0x20,0x20,0x20,0x21,0x22,0x22,0x22,0x7F,0x00,0x00,
0x00,0x00,0x00,0xFF,0x44,0x62,0x55,0x49,0x55,0x43,0x41,0x40,0xFF,0x00,0x00,0x00,
0x40,0x20,0x18,0x07,0x04,0x28,0x63,0x21,0x21,0x3F,0x11,0x15,0x1B,0x30,0x00,0x00},
{0x80,0x88,0x88,0x88,0xFF,0x88,0x88,0x88,0x00,0xFE,0x02,0x02,0x02,0xFE,0x00,0x00, //却话巴山夜雨时
0x40,0x41,0x4E,0xC4,0x00,0x20,0x24,0x24,0x24,0x24,0xFC,0x22,0x22,0x22,0x20,0x00,
0x00,0x00,0xFE,0x42,0x42,0x42,0x42,0x7E,0x42,0x42,0x42,0x42,0xFE,0x00,0x00,0x00,
0x00,0x00,0xE0,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0xE0,0x00,0x00,
0x04,0x04,0x84,0xC4,0x3C,0x14,0x85,0x66,0xBC,0x24,0x24,0x24,0xE4,0x24,0x04,0x00,
0x02,0x02,0xF2,0x32,0x52,0x92,0x12,0xFE,0x32,0x52,0x92,0x12,0xF2,0x02,0x02,0x00,
0x00,0xFC,0x44,0x44,0x44,0xFC,0x10,0x90,0x10,0x10,0x10,0xFF,0x10,0x10,0x10,0x00},
{0x00,0x10,0x3C,0x13,0x10,0x08,0x0A,0x1C,0x08,0xFF,0x00,0x08,0x10,0x0F,0x00,0x00,
0x00,0x00,0x00,0x7F,0x20,0x10,0x00,0x7E,0x22,0x22,0x23,0x22,0x22,0x7E,0x00,0x00,
0x00,0x00,0x3F,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x78,0x20,0x00,
0x00,0x20,0x7F,0x20,0x20,0x20,0x20,0x3F,0x20,0x20,0x20,0x20,0x20,0x7F,0x00,0x00,
0x02,0x01,0x00,0xFF,0x00,0x82,0x41,0x22,0x14,0x09,0x14,0x23,0x40,0xC0,0x40,0x00,
0x00,0x00,0xFF,0x01,0x02,0x04,0x00,0x7F,0x01,0x02,0x44,0x80,0x7F,0x00,0x00,0x00,
0x00,0x07,0x04,0x04,0x04,0x07,0x00,0x00,0x03,0x40,0x80,0x7F,0x00,0x00,0x00,0x00},
};
////////////////////////////////
//发送一个字节到ST7565P并等待发送完毕
//入口：要发送的字节
//返回值：无
////////////////////////////////
void SPIByte(unsigned char byte)
{
SPDR = byte; //写数据
while(!(SPSR & (1<//等待发送完成
}
////////////////////////////////////////////////
//将一个字节发送的ST7565P的函数
//入口参数： select ,data
//select:根据此值确定发送给ST7565P的是数据还是命令
//data: 要发送给ST7565的一个字节
//返回值：无
////////////////////////////////////////////////
void LCD_SPISend(unsigned char select,unsigned char data)
{
PORTC &= ~(1<<2); // CS=0 芯片使能信号
if(select == COMMAND) //传输的是命令
{
PORTC &= ~(1<<0); // 根据ST7565P的数据手册，传输命令时A0应该是为低电平
SPIByte(data);
PORTC |= 1<<0; // A0=1
}
else
{
SPIByte(data);
}
PORTC |= 1<<2; //CS= 恢复不使能
}
////////////////////////////////////////////
//写坐标函数
//入口参数：x y
//y: 页面地址，此液晶将显示区域分为9个页面，y的值域0~8
//x: 列地址，值域：0~127
//返回值：无
////////////////////////////////////////////
void LCD_XYSet(unsigned char x,unsigned char y)
{
LCD_SPISend(COMMAND,0xB0|y); //y的值为0~8
LCD_SPISend(COMMAND,0x10|(x>>4));
LCD_SPISend(COMMAND,0x00|(x&0x0F));
}
/////////////////////////////////////
//延时函数
//入口： ms 当延时100毫秒时，ms的值为100即可
//返回值：无
/////////////////////////////////////
void DelayMs(volatile unsigned int ms)
{
volatile unsigned int i;
volatile unsigned int j;
for(i=0;i
{
j=280;
while(j--);
}
}
//////////////////////////////////////////////////////
//初始化SPI及液晶屏的函数
//入口：无
//返回值：无
/////////////////////////////////////////////////////
void LCD_Init(void)
{
SPCR = 0x5C;
SPSR |= 1<
//SPI的功能设置解释：使能SPI；采用主机模式；SPI的传输模式为模式3；时钟频率为系统时钟的两分频，即 //3.6864/2M
DelayMs(100);
SPIByte(0xFF); //可发可不发，无意义
PORTC &= ~(1<<1); //将复位脚拉低
DelayMs(5); //延时5ms，等待电源稳定
PORTC |= 1<<1; //将复位脚拉高
DelayMs(5);
LCD_SPISend(COMMAND,0xAE); //将液晶屏的显示关掉
LCD_SPISend(COMMAND,0xA3); //设置偏压比
LCD_SPISend(COMMAND,0xA0); //设置SEG 输出方向
LCD_SPISend(COMMAND,0xC8); //设置公共端输出扫描方向
LCD_SPISend(COMMAND,0x25); //调整 (1 + Rb/Ra) ratio 值，调整此值影响很大
LCD_SPISend(COMMAND,0x81); //开始设置α的命令
LCD_SPISend(COMMAND,0x28); //设置α的值，值越大对比度越强，调整此值影响不太，是微调的
DelayMs(5);
LCD_SPISend(COMMAND,0x2F); //开启相关电压
DelayMs(50);
LCD_SPISend(COMMAND,0xAF); //显示开
LCD_SPISend(COMMAND,0xF8);
LCD_SPISend(COMMAND,0x01); //此两条命令是设置升压比的
DelayMs(500); //不知此延时可否省去，不过了安全起见，初次调试保留为好。。
}
////////////////////////////////////////
//清屏函数
//入口：无
//返回值：无
///////////////////////////////////////
void Clear_Display(void)
{
unsigned char i;
unsigned char j;
for(i=0;i<8;i++)
{
LCD_XYSet(0,i);
for(j=0;j<128;j++)
{
LCD_SPISend(DATA,0); //传输数据
}
}
}
////////////////////////////////
//显示一首李商隐的诗歌：
// 君问归期未有期
// 巴山夜雨涨秋池
// 何当共剪西窗烛
// 却话巴山夜雨时
//入口：无
//返回值：无
////////////////////////////////
void Gushi_Display(void)
{
unsigned char i;
unsigned char j;
for(i=0;i<8;i++)
{
LCD_XYSet(8,i);
for(j=0;j<112;j++)
{
LCD_SPISend(DATA,__LPM(&gushi[i][j]));
}
}
}
int main(void)
{
DDRB = 0xFF; //将IO口配置为输出
PORTB = 0xFF; //让IO口都输出高电平
DDRC = 0xFF; //配置为输出
PORTC = 0xFF; //输出高电平
DelayMs(1);
LCD_Init(); //初始化的函数
Clear_Display(); //清屏函数
Gushi_Display();
while(1)
{
}
}
编译结果如下：
AVR Memory Usage
----------------
Device: atmega8515
Program: 1688 bytes (20.6% Full)
(.text + .data + .bootloader)
Data: 0 bytes (0.0% Full)
(.data + .bss + .noinit)
Build succeeded with 0 Warnings...
显示效果如下：
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