LCD1602组件

LCD1602.h

#ifndef _LCD1602_H
#define _LCD1602_H

#define LCD1602_DB P0

sbit LCD1602_RS = P1^0;
sbit LCD1602_RW = P1^1;
sbit LCD1602_E  = P1^5;

void LCDwaitReady();
void LCDwriteCmd(uint8_t cmd);
void LCDwriteDat(uint8_t dat);
void LCDsetCursor(uint8_t col, uint8_t row);
void LCDprintStr(uint8_t col, uint8_t row, uint8_t * str);
void LCDinit();
void LCDclear();
void LCDhome();
void LCDctrlDisplayCursorBlink(uint8_t display, uint8_t cursor, uint8_t blink);
void LCDsetCursordirCharshift(uint8_t cursorDir, uint8_t charShift);
void LCDsetShiftwhatShiftdir(uint8_t shiftWhat, uint8_t shiftDir);

#endif // _LCD1602_H

LCD1602.c

/**
 * 文件名：LCD1602.c
 * 描  述：1602字符液晶驱动模块
 */
#include <reg52.h>
#include "stdint.h"
#include "LCD1602.h"

/* 等待液晶准备好 */
void LCDwaitReady() {
    uint8_t state;

    LCD1602_DB = 0xFF;
    LCD1602_RS = 0;
    LCD1602_RW = 1;
    do {
        LCD1602_E = 1;
        state = LCD1602_DB; //读取状态字
        LCD1602_E = 0;
    } while (state & 0x80); //bit7等于1表示液晶正忙，重复检测直到其等于0为止
}
/* 向LCD1602液晶写入一字节命令，cmd-待写入命令值 */
void LCDwriteCmd(uint8_t cmd) {
    LCDwaitReady();
    LCD1602_RS = 0;
    LCD1602_RW = 0;
    LCD1602_DB = cmd;
    LCD1602_E  = 1;
    LCD1602_E  = 0;
}
/* 向LCD1602液晶写入一字节数据，dat-待写入数据值 */
void LCDwriteDat(uint8_t dat) {
    LCDwaitReady();
    LCD1602_RS = 1;
    LCD1602_RW = 0;
    LCD1602_DB = dat;
    LCD1602_E  = 1;
    LCD1602_E  = 0;
}
/* 设置显示RAM起始地址，亦即光标位置，(col, row)-对应屏幕上的字符坐标 */
void LCDsetCursor(uint8_t col, uint8_t row) {
    uint8_t addr;

    if (row == 0)  //由输入的屏幕坐标计算显示RAM的地址
        addr = col;  			//第一行字符地址从0x00起始
    else
        addr = 0x40 + col;  	//第二行字符地址从0x40起始
    LCDwriteCmd(addr | 0x80);  //设置RAM地址
}
/* 在液晶上显示字符串，(col, row)-对应屏幕上的起始坐标，str-字符串指针 */
void LCDprintStr(uint8_t col, uint8_t row, uint8_t * str) {
    LCDsetCursor(col, row);   //设置起始地址
	//连续写入字符串数据，直到检测到结束符
    while (*str != '\0') {
        LCDwriteDat(*str++);
    }
}
/* 初始化1602液晶 */
void LCDinit() {
    LCDwriteCmd(0x38);  //16*2显示，5*7点阵，8位数据接口
    LCDwriteCmd(0x0C);  //显示器开，光标关闭
    LCDwriteCmd(0x06);  //文字不动，地址自动+1
    LCDwriteCmd(0x01);  //清屏
}
/* 清除液晶显示屏上的内容，同时将光标移动到初始位置左上角 */
void LCDclear() {
    LCDwriteCmd(0x01);
}
/* 将光标移动到初始位置左上角，但不清除液晶屏幕上的内容 */
void LCDhome() {
    LCDwriteCmd(0x02);
}
/* 显示开关控制，
 * 控制整体显示的开/关，光标的开/关，光标是否闪烁：
 * 由combine的低三位决定，高电平表示开，低电平表示关 */
void LCDctrlDisplayCursorBlink(uint8_t display, uint8_t cursor, uint8_t blink) {
    uint8_t combine;

    combine = ((display << 2) | (cursor << 1) | blink);
    LCDwriteCmd(0x08 | combine);
}

void LCDsetCursordirCharshift(uint8_t cursorDir, uint8_t charShift) {
    uint8_t combine;

    combine = ((cursorDir << 1) | charShift);
    LCDwriteCmd(0x04 | combine);
}

void LCDsetShiftwhatShiftdir(uint8_t shiftWhat, uint8_t shiftDir) {
    uint8_t combine;

    combine = ((shiftWhat << 1) | shiftDir);
    LCDwriteCmd(0x10 | combine);
}