用单片机C语言写LCD1602显示的代码

很高兴回答你的问题。以下是用单片机C语言编写LCD1602显示的代码示例：

// 定义LCD数据口
sbit LCD_D4 = P2^4;
sbit LCD_D5 = P2^5;
sbit LCD_D6 = P2^6;
sbit LCD_D7 = P2^7;
// 定义LCD控制口
sbit LCD_RS = P1^0;
sbit LCD_RW = P1^1;
sbit LCD_EN = P1^2;

void LCD_Init() {
    delay(20);      // 延时20ms等待LCD上电稳定
    LCD_WriteCmd(0x28);     // 开始初始化，函数集合：8位线、2行、5*7点阵
    LCD_WriteCmd(0x0C);     // 显示开启，光标关闭
    LCD_WriteCmd(0x06);     // 显示地址自增，光标不移动
    LCD_WriteCmd(0x01);     // 清屏
}

void LCD_WriteCmd(unsigned char cmd) {
    LCD_RS = 0;         // 命令模式
    LCD_RW = 0;         // 写入模式
    LCD_EN = 0;         // 干扰信号清零
    LCD_D4 = (cmd & 0x01);
    LCD_D5 = (cmd & 0x02) >> 1;
    LCD_D6 = (cmd & 0x04) >> 2;
    LCD_D7 = (cmd & 0x08) >> 3;
    LCD_EN = 1;         // 发送高电平
    delay(1);           // 延时1ms等待执行
    LCD_EN = 0;         // 发送低电平
    LCD_D4 = (cmd & 0x10) >> 4;
    LCD_D5 = (cmd & 0x20) >> 5;
    LCD_D6 = (cmd & 0x40) >> 6;
    LCD_D7 = (cmd & 0x80) >> 7;
    LCD_EN = 1;         // 发送高电平
    delay(1);           // 延时1ms等待执行
    LCD_EN = 0;         // 发送低电平
}

void LCD_WriteData(unsigned char dat) {
    LCD_RS = 1;         // 数据模式
    LCD_RW = 0;         // 写入模式
    LCD_EN = 0;         // 干扰信号清零
    LCD_D4 = (dat & 0x01);
    LCD_D5 = (dat & 0x02) >> 1;
    LCD_D6 = (dat & 0x04) >> 2;
    LCD_D7 = (dat & 0x08) >> 3;
    LCD_EN = 1;         // 发送高电平
    delay(1);           // 延时1ms等待执行
    LCD_EN = 0;         // 发送低电平
    LCD_D4 = (dat & 0x10) >> 4;
    LCD_D5 = (dat & 0x20) >> 5;
    LCD_D6 = (dat & 0x40) >> 6;
    LCD_D7 = (dat & 0x80) >> 7;
    LCD_EN = 1;         // 发送高电平
    delay(1);           // 延时1ms等待执行
    LCD_EN = 0;         // 发送低电平
}

void LCD_WriteString(unsigned char x, unsigned char y, unsigned char *a) {
    unsigned char i;
    if(x == 1) {
        LCD_WriteCmd(0x80 + (y - 1));
    } else {
        LCD_WriteCmd(0xC0 + (y - 1));
    }
    for(i = 0; a[i] != '\0'; i++) {
        LCD_WriteData(a[i]);
    }
}

void main() {
    LCD_Init();
    LCD_WriteString(1,1,"Hello, World!");
}

以上代码仅供参考，具体使用时需要根据LCD屏幕类型和单片机型号做出相应调整。希望能对您有所帮助。