专做网站的公司,163注册企业邮箱,上海哪个区最好,兰州网站建设招聘信息31. LCD1602 31.1. LCD1602介绍 •LCD1602#xff08;Liquid Crystal Display#xff09;液晶显示屏是一种字符型液晶显示模块#xff0c;可以显示ASCII码的标准字符和其它的一些内置特殊字符#xff0c;还可以有8个自定义字符 •显示容量#xff1a;162个字符#xff0c…31. LCD1602 31.1. LCD1602介绍 •LCD1602Liquid Crystal Display液晶显示屏是一种字符型液晶显示模块可以显示ASCII码的标准字符和其它的一些内置特殊字符还可以有8个自定义字符 •显示容量16×2个字符每个字符为5*7点阵 31.2. 引脚及应用电路 接线D0~D7与单片机P口高低位对齐 31.3. 内部结构框图 CGRAM CGROM类似段码表RAM可写ROM不可写 DDRAM用户可写DDRAM40x2比屏幕大但是前16映射屏幕多出来的可以移屏显示 AC光标位置地址计数器指令确定AC的位置 31.4. 存储器结构 举例A的索引码0100 0001 B 0x41,上方的索引码填入到左侧的xxxx中 索引码同ASIC码 31.5. 时序结构写的时序结构 RS1数据;RS0(指令) RW0; DB0~DB7放好数据 E1写入数据 E0完成写入 31.6. LCD1602指令集 下表是指令的格式指令集 原LCD1602程序中显示行列xxx就是在设置DDRAM地址光标位置 31.7. LCD1602操作流程 •初始化 发送指令0x38 //八位数据接口两行显示5*7点阵 发送指令0x0C //显示开光标关闪烁关 发送指令0x06 //数据读写操作后光标自动加一画面不动 发送指令0x01 //清屏 •显示字符 发送指令0x80|AC //设置光标位置//实际地址最高为必须置1代表是地址设置的指令 发送数据 //发送要显示的字符数据 发送数据 //发送要显示的字符数据 …… 31.8. 字符、字符串 •字符根据一定规则建立的数字到字符的映射ASCII码表 例如0x21’!’0x41’A’0x00’\0’ 定义方法char x‘A’;等效于char x0x41; •字符数组存储字符变量的一个数组 定义方法char y[]{’A’, ’B’, ’C’}; 等效于char y[]{0x41,0x42,0x43}; •字符串在字符数组后加一个字符串结束标志本质上是字符数组 定义方法char z[]”ABC”;等效于char z[]{’A’, ’B’, ’C’, ’\0’};
32. LCD1602显示模块编程 32.1. 编程思路 需要编写LCD写数据模块和写命令模块编写LCD初始化模块编写LCD光标位设置模块编写LCD_ShowChar显示单字节模块 32.2. LCD1602.c和LCD1602.h程序如下
#include REGX52.Hsbit LCD_RSP2^6;
sbit LCD_RWP2^5;
sbit LCD_EP2^7;
#define LCD_DataPort P0/*定义一个1ms延时函数*/
void LCD_Delay(void) //12.000MHz, 1ms延时
{unsigned char data i, j;i 2;j 239;do{while (--j);} while (--i);
}
/*LCD写命令函数*/
void LCD_WriteCommand(unsigned char Command)
{LCD_RS0;LCD_RW0;LCD_DataPortCommand;LCD_E1;LCD_Delay(); //如果不延时会出错LCD_E0;LCD_Delay(); //如果不延时会出错
}
/*LCD写数据函数*/
void LCD_WriteData(unsigned char Data)
{LCD_RS1;LCD_RW0;LCD_DataPortData;LCD_E1;LCD_Delay(); //如果不延时会出错LCD_E0;LCD_Delay(); //如果不延时会出错
}
/*LCD初始化函数*/
void LCD_Init(void)
{LCD_WriteCommand(0x38);LCD_WriteCommand(0x0c);LCD_WriteCommand(0x06);LCD_WriteCommand(0x01);
}
/*LCD光标位置设置函数*/
void LCD_SetCursor(unsigned char Line,unsigned char Column)
{if(Line1){LCD_WriteCommand(0x80|(Column-1));}if(Line2){LCD_WriteCommand(0x80|(Column-1)0x40); //0x40是根据表格进行的移位}
}
/*LCD显示一个字符函数*/
void LCD_ShowChar(unsigned char Line,unsigned char Column,unsigned char Char)
{LCD_SetCursor(Line,Column); //光标位置LCD_WriteData(Char); //写入数据
}
/*LCD显示字符串函数*/
void LCD_ShowString(unsigned char Line,unsigned char Column,unsigned char String[]) //String[]传递的是首地址和指针一致
{unsigned char i;LCD_SetCursor(Line,Column);for(i0;String[i]!\0;i){LCD_WriteData(String[i]);}
}/*定义一个次方函数*/
int LCD_Power(int X, int Y)
{unsigned char i;int Result1;for(i0;iY;i){Result*X;}return Result;
}
/*LCD显示无符号数函数*/
void LCD_ShowNum(unsigned char Line,unsigned char Column,unsigned int Number,unsigned char Length)
{unsigned char i;LCD_SetCursor(Line,Column);for(iLength;i0;i--){LCD_WriteData(0Number/LCD_Power(10,i-1)%10); //加0等于加0x30对应码表否则显示空}
}
/*LCD显示有符号数函数*/
void LCD_ShowSignedNum(unsigned char Line,unsigned char Column,int Number,unsigned char Length)
{unsigned char i;unsigned int Number1; //借用Number1防止-32768无法显示LCD_SetCursor(Line,Column);if(Number0) //判断数字大于0加号{LCD_WriteData();Number1Number;}else //判断数字小于0加-号{LCD_WriteData(-);Number1-Number; //如果没有Numberchar -32768会超出}for(iLength;i0;i--){LCD_WriteData(0Number1/LCD_Power(10,i-1)%10); //加0等于加0x30对应码表否则显示空}
}
/*LCD显示有16进制数函数*/
void LCD_ShowHexNum(unsigned char Line,unsigned char Column,unsigned int Number,unsigned char Length)
{unsigned char i;unsigned char SingleNumber;LCD_SetCursor(Line,Column);for(iLength;i0;i--){SingleNumberNumber/LCD_Power(16,i-1)%16;if(SingleNumber10){LCD_WriteData(0SingleNumber); }else{LCD_WriteData(ASingleNumber-10); //A的偏移对应10~16 A~F-10对齐表格}}
}
/*LCD显示有2进制数函数*/
void LCD_ShowBinNum(unsigned char Line,unsigned char Column,unsigned int Number,unsigned char Length)
{unsigned char i;LCD_SetCursor(Line,Column);for(iLength;i0;i--){LCD_WriteData(0Number/LCD_Power(2,i-1)%2); }
}#ifndef _LCD1602_H_
#define _LCD1602_H_ void LCD_Init(void);
void LCD_ShowChar(unsigned char Line,unsigned char Column,unsigned char Char);
void LCD_ShowString(unsigned char Line,unsigned char Column,unsigned char String[]);
void LCD_ShowNum(unsigned char Line,unsigned char Column,unsigned int Number,unsigned char Length);
void LCD_ShowSignedNum(unsigned char Line,unsigned char Column,int Number,unsigned char Length);
void LCD_ShowHexNum(unsigned char Line,unsigned char Column,unsigned int Number,unsigned char Length);
void LCD_ShowBinNum(unsigned char Line,unsigned char Column,unsigned int Number,unsigned char Length);
void LCD_WriteCommand(unsigned char Command);#endifmain主程序为
#include REGX52.h
#include LCD1602.h
#include delay_xms.hvoid main()
{LCD_Init();LCD_ShowChar(1,1,A); //索引码A0x41; \反斜杠用于转义如\;\\标准ASIC是反斜杠中文是钱币符号LCD_ShowString(1,3,Hello);LCD_ShowNum(1,9,66,2);LCD_ShowSignedNum(1,12,-88,2);LCD_ShowHexNum(2,1,0xA5,2);LCD_ShowBinNum(2,4,0xA5,8);LCD_ShowChar(2,13,0xdf); //直接输入码表地址0xdf0xe0LCD_ShowChar(2,14,C); //直接输入码表地址0xdf0xe0LCD_ShowString(1,16,Welcome to China!);while(1){LCD_WriteCommand(0x18); //流动字幕效果的移屏命令地址delay_xms(500);}}Proteus测试无误
