dianya.rar_dianya

/*------------------------------------------------------------------ CharLCD.C (v1.00) 16x2 字符液晶屏驱动程序 ------------------------------------------------------------------*/ #include "CharLCD.h" //Change the following section accroding to you hardware #ifdef _LCDXADDR #define Lcd1602WCmdPort (*(volatile uchar *)0x2000) //E=1 RS=0 RW=0 #define Lcd1602RStatusPort (*(volatile uchar *)0x2001) //E=1 RS=0 RW=1 #define Lcd1602WdataPort (*(volatile uchar *)0x2002) //E =1 RS=1 RW=0 #define Lcd1602RDataPort (*(volatile uchar *)0x2003) //E=1 RS=1 RW=1 #else #ifdef _51 sbit lcd_cs = P2^0; //控制位 sbit lcd_rw = P2^1; sbit lcd_rs = P2^2; #define DataPort P0 #define DataDirPort P0 #define StatePort P0 #endif #ifdef _AVR #define lcd_cs PORTC.0 //控制位以及其方向控制位 #define lcd_cs_dir_bit DDRC.0 #define lcd_rw PORTC.1 #define lcd_rw_dir_bit DDRC.1 #define lcd_rs PORTC.2 #define lcd_rs_dir_bit DDRC.2 #define DataPort PORTA #define StatePort PINA #define DataDirPort DDRA #endif #endif // ------ Private constants ---------------------------------------- #define Busy 0x80 // 忙判别位 // ------ Private variables----------------------------------------- #ifdef _51 code uchar* WrtieLcdErr = "Display char outof range."; #endif #ifdef _AVR flash uchar* WrtieLcdErr = "Display char outof range."; #endif // ------ Private function prototypes ------------------------------ static BOOL WaitTillNotBusy(); static BOOL LocateXY(uchar posx,uchar posy); static BOOL LcdWData(uchar dataW); static BOOL LcdWCMD(uchar CMD); /*------------------------------------------------------------------ WaitTillNotBusy() 检测忙 ------------------------------------------------------------------*/ BOOL WaitTillNotBusy() { uint delay = 0xffff; #ifdef _LCDXADDR while( (Lcd1602RStatusPort & Busy) && delay ) delay--; if (!delay) return FALSE; #else #ifdef _AVR DataDirPort = 0x00; #endif #ifdef _51 DataDirPort = 0xff; #endif lcd_cs = 1; lcd_rs = 0; lcd_rw = 1; while( (StatePort & Busy) && delay) delay--; lcd_cs = 0; if (!delay) return FALSE ; #endif return TRUE; } /*------------------------------------------------------------------ LocateXY() 显示光标定位 ------------------------------------------------------------------*/ BOOL LocateXY( uchar posx,uchar posy) { posy &= 0x01; if (posy == 1) posx |= 0x40; posx |= 0x80; return LcdWCMD(posx); } /*------------------------------------------------------------------ LcdWCMD() 写控制字符子程序: E=1 RS=0 RW=0 ------------------------------------------------------------------*/ BOOL LcdWCMD(uchar CMD) { #ifdef _LCDXADDR if (!WaitTillNotBusy()) // 检测忙信号? return FALSE; Lcd1602WCmdPort = CMD; #else uchar i=1; if (!WaitTillNotBusy()) // 检测忙信号? return FALSE; #ifdef _AVR DataDirPort = 0xff; #endif DataPort = CMD; lcd_rs = 0; lcd_rw = 0; lcd_cs = 1; while(i++); lcd_cs = 0; #endif return TRUE; } /*------------------------------------------------------------------ LcdWData() 当前位置写字符子程序: E =1 RS=1 RW=0 ------------------------------------------------------------------*/ BOOL LcdWData( uchar dataW ) { #ifdef _LCDXADDR if (!WaitTillNotBusy()) // 检测忙信号? return FALSE; Lcd1602WdataPort = dataW; #else uchar i = 1; if (!WaitTillNotBusy()) // 检测忙信号? return FALSE; #ifdef _AVR DataDirPort = 0xff; #endif DataPort = dataW; lcd_rs = 1; lcd_rw = 0; lcd_cs = 1; while(i++); lcd_cs = 0; #endif return TRUE; } /*------------------------------------------------------------------ LCDInit() 初始化程序, 必须按照产品资料介绍的初始化过程进行 ------------------------------------------------------------------*/ BOOL LCDInit() { #ifdef _AVR #ifndef _LCDXADDR lcd_cs_dir_bit = 1; lcd_rw_dir_bit = 1; lcd_rs_dir_bit = 1; #endif #endif // 显示模式设置,光标移动设置,显示开及光标设置,显示清屏 return (LcdWCMD( 0x38) && LcdWCMD( 0x06) && LcdWCMD( 0x0c) && LcdWCMD( 0x01)); } /*------------------------------------------------------------------ DisplayOneChar() 按指定位置显示数出一个字符 ------------------------------------------------------------------*/ BOOL DisplayOneChar(uchar x ,uchar y ,uchar Wdata) { if( (x >= 0 && x < 16) && (y >= 0 && y < 2) ) return (LocateXY( x, y ) && LcdWData( Wdata )) ;// 定位显示地址,写字符 else return ( LCDInit() && DisplayString(0, 0, WrtieLcdErr)); //显示越界消息 } /*------------------------------------------------------------------ DisplayString() 从指定位置开始显示一串字符 ------------------------------------------------------------------*/ BOOL DisplayString(uchar posx, uchar posy, flash uchar* str) { while ( (*str) != '\0' ) { if (!DisplayOneChar(posx, posy, (*str))) return FALSE; str++; posx++; if( posx == 16 ) { posx = 0; posy++; } } return TRUE; } /*------------------------------------------------------------------ ---- END OF FILE ------------------------------------------------- ------------------------------------------------------------------*/