/*------------------------------------------------------------<br />ST7920中文字库液晶显示模块LCD12232并行8位显示C30演示程序<br />C30菜鸟HotPower@126.com 2007.12.8 于雁塔菜地<br />-------------------------------------------------------------*/<br /><br />#include "lcd.h"<br /><br />unsigned char LcdRowWriteEnable[2] = {0, 0};//显示行刷新允许标志<br />unsigned char LcdBuffer[2][15];//LCD显示缓冲区(2行15个字符)<br />unsigned char LcdRow = 0, LcdCol = 0;//虚拟光标<br /><br />void LcdInit(void)//LCD初始化<br />{<br /> LcdIOInit();//LCD管脚初始化<br /> LcdClearBuffer();//清空LCD显示缓冲区<br /><br />// LcdWriteCommand(0x20);//发送功能设定控制命令(4位)<br /> LcdWriteCommand(0x30);//发送功能设定控制命令(8位)<br /> LcdWriteCommand(0x02);//发送位址归位命令,设定DDRAM位址计数器为0<br /> LcdWriteCommand(0x04);//发送进入点命令 <br /> LcdWriteCommand(0x0c);//发送开显示关光标命令<br /> LcdWriteCommand(0x01);//发送清除显示命令 <br /> LcdWriteCommand(0x80);//发送设定DDRAM地址0x00命令,光标定位到(0,0)<br /><br />/*----------------------------------------------------------------------<br /> LcdWriteCommand(0x30);//发送功能设定控制命令(8位)<br /> LcdWriteCommand(0x30);//发送功能设定控制命令(8位)<br /> LcdWriteCommand(0x30);//发送功能设定控制命令(8位)<br /> LcdWriteCommand(0x01);//发送清除显示命令 <br /> LcdWriteCommand(0x06);//发送进入点命令0x06 <br /> LcdWriteCommand(0x0a);//发送开关显示关光标命令<br /> LcdWriteCommand(0x0c);//发送开显示关光标命令<br /> LcdWriteCommand(0x02);//发送位址归位命令,设定DDRAM位址计数器为0<br /> LcdWriteCommand(0x17);//游标或显示移位控制<br /> LcdWriteCommand(0x80);//发送设定DDRAM地址0x00命令,光标定位到(0,0)<br />----------------------------------------------------------------------*/<br /> LCD_BK = 0;//打开背光<br />}<br /><br />void LcdIOInit(void)//LCD管脚初始化<br />{<br /> LCD_BK = 0;//打开背光<br /> LCD_E = 0;//不使能 <br /> LCD_RW = 1;//写读数据 <br /> TRIS_E = PORTOUTMODE;//定义E为输出IO<br /> TRIS_RW = PORTOUTMODE;//定义RW为输出IO<br /> TRIS_RS = PORTOUTMODE;//定义RS为输出IO<br /> TRIS_BK = PORTOUTMODE;//定义BK为输出IO<br /> TRIS_DATA = 0;//定义RE0~RE7为输出IO<br />}<br /><br />void LcdWriteCommand(unsigned char Command)//写LCD命令字<br />{<br /> LCD_RS = 0;//命令 <br /> Nop(); <br /> LCD_RW = 0;//写命令 <br /> Nop(); <br /> LCD_E = 1;//使能 <br /> Nop(); <br /> LCD_BUS = Command;//发送8位命令 <br /> Nop(); <br /> LCD_E = 0;//不使能,读出数据 打入命令<br /> Nop(); <br /> LCD_RW = 1;//写命令结束 <br /> if (Command == 0x01)//清除显示命令,需要等待时间相对较长<br /> {<br /> _delay_loop(1600);//st7920要求等待1.6mS<br /> }<br /> else<br /> {<br /> _delay_loop(72);//st7920要求等待72uS<br /> }<br />}<br /><br />void LcdWriteData(unsigned char data)//写LCD显示数据 <br />{ <br /> LCD_RS = 1;//数据 <br /> Nop(); <br /> LCD_RW = 0;//写数据 <br /> Nop(); <br /> LCD_E = 1;//使能 <br /> Nop(); <br /> LCD_BUS = data;//发送8位数据 <br /> Nop(); <br /> LCD_E = 0;//不使能,打入数据 <br /> Nop(); <br /> LCD_RW = 1;//写数据结束 <br /> _delay_loop(72);//st7920要求等待72uS<br />} <br /><br />void LcdWaitBusy(void)//LCD忙标志测试(有时死机,故没用) <br />{ <br /> TRIS_DATA = 0xff;//定义RE0~RE7为输入IO <br /> LCD_BUS = 0xff;<br /> Nop(); <br /> LCD_RS = 0;//命令 <br /> Nop(); <br /> LCD_RW = 1;//读数据<br /> Nop(); <br /> LCD_E = 1;//使能 <br /> Nop(); <br /> while(LCD_BF)//读取忙碌标志BF(LCD_DATA.7)<br /> {<br /> Nop();//搞不清有时死机在此处,所以用_delay_loop()代替<br /> }<br /> LCD_E = 0;//不使能,读出状态 <br /> Nop(); <br /> TRIS_DATA = 0;//定义RE0~RE7为输出IO<br /> Nop(); <br />} <br /><br />void LcdClearBuffer(void)<br />{<br />unsigned char i, j;<br /> for (i = 0;i < 2;i ++)//2行字符 <br /> {//2行汉字<br /> for (j = 0;j < 15; j ++)//15个字符<br /> {//每行7个半汉字15个字符<br /> LcdBuffer[j] = ' ';//空白字符<br /> }<br /> LcdRowWriteEnable = 1;//允许此行刷新汉字显示<br /> }<br /> LcdRow = 0;//虚拟光标定位在0行<br /> LcdCol = 0;//虚拟光标定位在0列<br />}<br /><br /><br />void LcdDisplayPos(unsigned char row, unsigned char col)<br />{<br /> if ((row < 2) && (col < 15))//容错处理,光标越界<br /> {<br /> LcdRow = row;//刷新虚拟光标<br /> LcdCol = col;//刷新虚拟光标<br /> LcdRowWriteEnable[row] = 1;//允许此行刷新汉字显示<br /> }<br />}<br /><br />void LcdDisplay(const char * string)//不真的LCD显示<br />{<br /> while(*string)//0字符结束<br /> {<br /> LcdBuffer[LcdRow][LcdCol ++] = *string ++;//写入显示缓冲区<br /> }<br />}<br /><br />unsigned char LcdDisplayBuffer(void)//显示刷新LCD缓冲区内的数据(一般0.25S~0.5S刷新一次)<br />{<br />unsigned char i, j;<br />unsigned char num = 0;//刷新字符个数<br /> for (i = 0; i < 2; i ++)<br /> {//2行汉字<br /> if (LcdRowWriteEnable)<br /> {//允许此行刷新汉字显示<br /> LcdWriteCommand(0x80 + (i << 4));//移动真的LCD光标<br /> for (j = 0; j < 15; j ++)<br /> {//每行7个半汉字15个字符<br /> LcdWriteData(LcdBuffer[j]);//刷新显示字符<br /> num ++;//刷新字符个数计数<br /> }<br /> LcdRowWriteEnable = 0;//过后不允许此行刷新汉字显示<br /> }<br /> }<br /> return num;//返回实际刷新字符个数<br />}<br /><br />void _delay_loop(unsigned long count)//软件延时<br />{<br /> while(count --)<br /> {<br /> //ClrWdt();//注意大延时要记住喂狗<br /> }<br />}<br /> <br /> 相关链接:<a href='http://blog.**/hotpower/65478/message.aspx'>http://blog.**/hotpower/65478/message.aspx</a> |
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