LGM12864LCD显示驱动程序.pdf

// // 名称: LGM12864LCD显示驱动程序 (不带字库) // // 作者：莫利奖 #include avr/io.h #include util/delay.h #include string.h #define INT8U unsigned char #define INT16U unsigned int //LCD起始行/页/列指令定义 #define LCD_START_ROW 0xC0 //起始行 #define LCD_PAGE 0xB8 //页指令 #define LCD_COL 0x40 //列指令 //液晶控制引脚 #define RW PD0 //读写 #define DI PD1 //数据/指令 #define E PD2 //使能 #define CS1 PD3 //右半屏选择 #define CS2 PD4 //左半屏选择 #define RST PD5 //复位 //液晶端口 #define LCD_PORT PORTC //液晶DB0-DB7 #define LCD_DDR DDRC //设置数据方向 #define LCD_PIN PINC //读状态数据 #define LCD_CTRL PORTD //液晶控制端口 //液晶引脚操作定义 #define RW_1() LCD_CTRL |= _BV(RW) #define RW_0() LCD_CTRL = ~_BV(RW) #define DI_1() LCD_CTRL |= _BV(DI) #define DI_0() LCD_CTRL = ~_BV(DI) #define E_1() LCD_CTRL |= _BV(E) #define E_0() LCD_CTRL = ~_BV(E) #define CS1_1() LCD_CTRL |= _BV(CS1) #define CS1_0() LCD_CTRL = ~_BV(CS1) #define CS2_1() LCD_CTRL |= _BV(CS2) #define CS2_0() LCD_CTRL = ~_BV(CS2) #define RST_1() LCD_CTRL |= _BV(RST) #define RST_0() LCD_CTRL = ~_BV(RST) //是否反相显示(白底黑字/黑底白字) INT8U Reverse_Display = 0; // // 等待液晶就绪 // void Wait_LCD_Ready() { Check_Busy: LCD_DDR = 0x00; //设置数据方向为输入 LCD_PORT = 0xFF; //内部上拉 RW_1(); asm(nop); DI_0(); //读状态寄存器 E_1(); asm(nop); E_0(); if(LCD_PIN 0x80) goto Check_Busy; } // // 向LCD发送命令 // void LCD_Write_Command(INT8U cmd) { Wait_LCD_Ready(); //等待LCD就绪 LCD_DDR = 0xFF; //设置方向为输出 LCD_PORT = 0xFF; //初始输出高电平 RW_0(); asm(nop); DI_0(); //写命令寄存器 LCD_PORT = cmd; //发送命令 E_1(); asm(nop); E_0(); //写入 } // // 向LCD发送数据 // void LCD_Write_Data(INT8U dat)