【51单片机零基础-chapter6:LCD1602调试工具】

实验0-用显示屏LCD验证自己的猜想

如同c++的cout,前端的console.log()

#include <REGX52.H>
#include <INTRINS.H>
#include "LCD1602.h"
int var=0;
void main()
{LCD_Init();LCD_ShowNum(1,1,var+211,5);while(1){;}
}

实验1-编写LCD1602液晶显示屏驱动函数

LCD1602.c

#include <REGX52.H>
#include <INTRINS.H>
#include "LCD1602.h"sbit LCD_RS=P2^6;				//LCD1602 RS 数据/指令选择
sbit LCD_RW=P2^5;				//LCD1602 RW 读/写选择
sbit LCD_EN=P2^7;				//LCD1602 EN 使能 #define LCD_DataPort		P0	//LCD1602 D0~D7 数据端口/*** @brief  LCD1602延时函数，12MHz调用可延时1ms* @param  无* @retval 无*/
void LCD_Delay()		//@11.0592MHz 1ms
{unsigned char i, j;_nop_();i = 2;j = 199;do{while (--j);} while (--i);
}/*** @brief  LCD1602写命令* @param  Command 要写入的命令* @retval 无*/
void LCD_WriteCommand(unsigned Command)
{LCD_RS = 0;					//LCD1602指令LCD_RW = 0;					//LCD1602写LCD_DataPort = Command;		//写指令LCD_EN = 1;					//LCD1602 EN使能为高LCD_Delay();				//delay 1ms，防止时序太快LCD1602来不及执行LCD_EN = 0;					//LCD1602 EN使能为低LCD_Delay();				//delay 1ms
}/*** @brief  LCD1602写数据* @param  Data 要写入的数据* @retval 无*/
void LCD_WriteData(unsigned Data)
{LCD_RS = 1;				//LCD1602数据LCD_RW = 0;				//LCD1602写LCD_DataPort = Data;	//写数据LCD_EN = 1;				//LCD1602 EN使能为高LCD_Delay();			//delay 1ms，防止时序太快LCD1602来不及执行LCD_EN = 0;				//LCD1602 EN使能为低LCD_Delay();			//delay 1ms
}/*** @brief  LCD1602初始化函数* @param  无* @retval 无*/
void LCD_Init(void)
{LCD_WriteCommand(0x38);	//8位数据接口，两行显示，5*7点阵LCD_WriteCommand(0x0c);	//显示开，光标关，闪烁关	LCD_WriteCommand(0x06);	//数据读写操作后，光标自动加1，画面不动LCD_WriteCommand(0x01);	//清屏
}/*** @brief  LCD1602设置光标位置* @param  Line 行位置，范围：1~2* @param  Column 列位置，范围：1~16* @retval 无*/
void LCD_SetCursor(unsigned char Line, unsigned char Column)
{unsigned char AC_DDRAM = 0;/* 计算写入到DDRAM（显示区）的光标AC的位置 */if(Line == 1){AC_DDRAM = 0x00 + (Column - 1);AC_DDRAM |= 0x80;}else if(Line == 2){AC_DDRAM = 0x40 + (Column - 1);AC_DDRAM |= 0x80;}LCD_WriteCommand(AC_DDRAM);	//设置光标地址
}/*** @brief  在LCD1602指定位置上显示一个字符* @param  Line 行位置，范围：1~2* @param  Column 列位置，范围：1~16* @param  Char 要显示的字符* @retval 无*/
void LCD_ShowChar(unsigned char Line, unsigned char Column, char Char)
{LCD_SetCursor(Line, Column);	//设置光标位置LCD_WriteData(Char);
}/*** @brief  在LCD1602指定位置上显示一个字符* @param  Line 行位置，范围：1~2* @param  Column 列位置，范围：1~16* @param  Char 要显示的字符* @retval 无*/
void LCD_ShowString(unsigned char Line, unsigned char Column, char *String)
{unsigned char i = 0;LCD_SetCursor(Line, Column);	//设置光标位置/* 打印字符串 */i = 0;while(String[i] != '\0'){LCD_WriteData(String[i]); //光标AC每次自动加1i++;}
}/*** @brief  返回值=X的Y次方*/
signed int LCD_Power(int x, int y)
{int result = 1;while(y > 0){result *= x;y--;}return result;
}/*** @brief  在LCD1602指定位置开始显示所给数字* @param  Line 起始行位置，范围：1~2* @param  Column 起始列位置，范围：1~16* @param  Number 要显示的数字，范围：0~65535* @param  Length 要显示数字的长度，范围：1~5* @retval 无*/
void LCD_ShowNum(unsigned char Line, unsigned char Column, unsigned int Num, unsigned char Length)
{unsigned char i = 0;unsigned char Chr;LCD_SetCursor(Line, Column);	//设置光标位置for(i=Length; i>0; i--){Chr = Num/LCD_Power(10,i-1)%10;if(Chr >=0 && Chr <= 9){Chr += 0x30;}LCD_WriteData(Chr);}
}/*** @brief  在LCD1602指定位置开始以有符号十进制显示所给数字* @param  Line 起始行位置，范围：1~2* @param  Column 起始列位置，范围：1~16* @param  Number 要显示的数字，范围：-32768~32767* @param  Length 要显示数字的长度，范围：1~5* @retval 无*/
void LCD_ShowSignedNum(unsigned char Line, unsigned char Column, int Num, unsigned char Length)
{unsigned char i = 0;unsigned char SingleNum;unsigned char Number1;LCD_SetCursor(Line, Column);	//设置光标位置if(Num>=0){LCD_WriteData('+');Number1 = Num;}else{LCD_WriteData('-');Number1 = -Num;			//-32768 转为32768之后可能会溢出}for(i=Length; i>0; i--){SingleNum = Number1/LCD_Power(10,i-1)%10;if(SingleNum >=0 && SingleNum <= 9){SingleNum += 0x30;}LCD_WriteData(SingleNum);}
}/*** @brief  在LCD1602指定位置开始以十六进制显示所给数字* @param  Line 起始行位置，范围：1~2* @param  Column 起始列位置，范围：1~16* @param  Number 要显示的数字，范围：0~0xFFFF* @param  Length 要显示数字的长度，范围：1~4* @retval 无*/
void LCD_ShowHexNum(unsigned char Line, unsigned char Column, unsigned int Num, unsigned char Length)
{unsigned char i = 0;unsigned char SingleNum;LCD_SetCursor(Line, Column);	//设置光标位置for(i=Length; i>0; i--){SingleNum = Num/LCD_Power(16,i-1)%16;if(SingleNum >=0 && SingleNum <= 9){SingleNum += 0x30;				}else if(SingleNum >=10 && SingleNum <= 15){SingleNum = SingleNum - 10 + 'A';		//16进制A,B,C,D,E,F}LCD_WriteData(SingleNum);}
}/*** @brief  在LCD1602指定位置开始以二进制显示所给数字* @param  Line 起始行位置，范围：1~2* @param  Column 起始列位置，范围：1~16* @param  Number 要显示的数字，范围：0~1111 1111 1111 1111* @param  Length 要显示数字的长度，范围：1~16* @retval 无*/
void LCD_ShowBinaryNum(unsigned char Line, unsigned char Column, unsigned int Num, unsigned char Length)
{unsigned char i = 0;unsigned char SingleNum;LCD_SetCursor(Line, Column);	//设置光标位置for(i=Length; i>0; i--){SingleNum = Num/LCD_Power(2,i-1)%2;SingleNum += 0x30;LCD_WriteData(SingleNum);}
}

LCD1602.h

#ifndef __LCD1602_H__
#define __LCD1602_H__void LCD_Init(void);
void LCD_WriteCommand(unsigned Command)
void LCD_ShowChar(unsigned char Line, unsigned char Column, char Char);
void LCD_ShowString(unsigned char Line, unsigned char Column, char *String);
void LCD_ShowNum(unsigned char Line, unsigned char Column, unsigned int Num, unsigned char Length);
void LCD_ShowSignedNum(unsigned char Line, unsigned char Column, int Num, unsigned char Length);
void LCD_ShowHexNum(unsigned char Line, unsigned char Column, unsigned int Num, unsigned char Length);
void LCD_ShowBinaryNum(unsigned char Line, unsigned char Column, unsigned int Num, unsigned char Length);
#endif

main.c

#include <REGX52.H>
#include <INTRINS.H>
#include "LCD1602.h"void main()
{LCD_Init();LCD_ShowChar(1, 1, 'Y');//显示一个字符:1行1列LCD_ShowString(1, 3, "POSTGRADUATE");//显示一个字符串:1行3列开始LCD_ShowNum(2, 1, 985, 3);//2行1列显示数字985,如果指定两位则不显示高位,为85,如果是四位则高位补零显示,为0985//LCD_ShowSignedNum(2, 5, -5, 1);//显示有符号数(符号不计入位数)//LCD_ShowHexNum(2, 8, 0xA8, 2);	//显示十六进制LCD_ShowBinaryNum(2, 5, 0xAA, 8);//显示二进制while(1){;}
}

比较核心的

实验2-动态显示

#include <REGX52.H>
#include "LCD1602.h"
#include "Delay.h"
int var=0;
void main()
{LCD_Init();while(1){var++;Delay(1000);	LCD_ShowNum(1,1,var,3);Delay(1000);}
}

实验3-滚动显示

在Main.c中增加LCD1602移屏指令

#include <REGX52.H>
#include <INTRINS.H>
#include "LCD1602.h"
#include "Delay.h"
void main(){LCD_Init();while(1){LCD_ShowString(1, 16, "CONGRATULATIONS!");LCD_ShowString(2, 16, "WELCOME TO UESTC , WANG XIAO !");Delay(500);LCD_WriteCommand(0x18);//调用一次左移一次//LCD_WriteCommand(0x1c);//调用一次右移一次		Delay(500);}
}

参考1:LCD显示时期
参考2:笔记
参考3:笔记
参考4:lcd位移
参考5:lcd驱动程序