单片机-LCD.C液晶驱动程序

附录 二LCD.C液晶驱动程序#includeREG51F.h#includeintrins.h#includeUSEH1.h#includelcd.h#includeHZcode.hbit busy_bit=1;/函数声明=void nop(void);bit CheckBusy(void); /状态检查/写显示数据/dat:显示数据void WriteByte(uchar dat);/向LCD发送命令/command :命令SendCommandToLCD(uchar command);/函数定义=void nop(void) _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();/状态检查bit CheckBusy(void) uchar state=0; P1=0xFF;/空读操作 RW=1; DI=0; EN=1; state=P1; EN=0; P1=0xFF;/再读才有效 RW=1; DI=0; EN=1; state=P1; EN=0; busy_bit=(bit)(state7); return(busy_bit);/写显示数据/dat:显示数据void WriteByte(uchar dat) while(CheckBusy(); DI=1; RW=0; LCD_P=dat; EN=1; EN=0;/*-*/向LCD发送命令/command :命令SendCommandToLCD(uchar command) while(CheckBusy(); RW=0; DI=0; LCD_P=command; EN=1; EN=0;/*-*/设定行地址(页)-X 0-7void SetLine(uchar line) line &= 0x07; / 0=line=7 line |= 0xb8; /1011 1xxx SendCommandToLCD(line);/设定列地址-Y 0-63void SetColumn(uchar column) column &= 0x3f; / 0=column=63 column |= 0x40; /01xx xxxx SendCommandToLCD(column);/设定显示开始行-XXvoid SetStartLine(uchar startline) /0-63 /startline &= 0x07; startline |= 0xc0; /1100 0000 SendCommandToLCD(startline);/开关显示void SetOnOff(uchar onoff) onoff|=0x3e; /0011 111x SendCommandToLCD(onoff);/*-*/选择屏幕/screen: 0-全屏,1-左屏,2-右屏void SelectScreen(uchar screen) /显示器:负有效 CS1: 0-右; CS2: 0-左 switch(screen) case 0: CS1=0;/全屏 nop(); CS2=0; nop(); break; case 1: CS1=1;/左屏 nop(); CS2=0; nop(); break; case 2: CS1=0;/右屏 nop(); CS2=1; nop(); break; default: break; /*-*/清屏/screen: 0-全屏,1-左屏,2-右void ClearScreen(uchar screen) uchar i,j; SelectScreen(screen); for(i=0;i8;i+) SetLine(i); for(j=0;j128) return; if(column64) SelectScreen(1); /如果列数64则从第一屏上开始写 SetLine(lin); SetColumn(column); for(i=0;i8;i+) if(column+i64) WriteByte(*(address+i); else SelectScreen(2); SetLine(lin); SetColumn(column-64+i); WriteByte(*(address+i); else SelectScreen(2); /否则从第二屏上开始写 column-=64; /防止越界 SetLine(lin); SetColumn(column); for(i=0;i8;i+) if(column+i7 | column127)return; address = &HZcodenum0; Show8x8(lin,column,address); Show8x8(lin,column+8,address+8); Show8x8(lin+1,column,address+16); Show8x8(lin+1,column+8,address+24);/*-*/void InitLCD(void) /初始化LCD uchar i=2000; /延时 while(i-); SetOnOff(1); /开显示 ClearScreen(1);/清屏 ClearScreen(2); SetStartLine(0); /开始行:0/*-*/*-*/显示图片/lin:行(0-7), column: 列(0-127)/high:高度, width:宽度(要为8的倍数)/address : 图片区首地址void ShowPicture(uchar lin, uchar column, uchar high, uchar width, uchar *address) uchar i, j; /if(column128) return; if(column64) for(j=0;jhigh;j+=8) SelectScreen(1); /如果列数64则从第一屏上开始写 SetLine(lin); SetColumn(column); for(i=0;i127) break; if(column+i64) WriteByte(*(address+i); else SelectScreen(2); SetLine(lin); SetColumn(column-64+i); WriteByte(*(address+i); lin+=1; address+=width; else column-=64; /防止越界 for(j=0;jhigh;j+=8) SelectScreen(2); /否则从第二屏上开始写 SetLine(lin); SetColumn(column); for(i=0;i64) break