I2C.rar_I2C单片机

#include<reg52.h> #define LCD1602_DB P0 sbit LCD1602_RS= P2^6; sbit LCD1602_RW = P2^5; sbit LCD1602_E = P2^7; void LcdWaitReady() //等待液晶屏---忙判断 { unsigned char sta; //LCD1602_E = 0; //保护硬件 LCD1602_DB = 0xFF; //读取之前需要拉到高电平 LCD1602_RS = 0; LCD1602_RW = 1; do{ LCD1602_E = 1; //读取状态011 sta = LCD1602_DB; LCD1602_E = 0; //用完必须要拉低，占用数码管，IO口 }while(sta & 0x80); //判断lcd1602_db 最高位是否为0 } void LcdWriteCmd(unsigned char cmd) { LcdWaitReady(); LCD1602_RS = 0; //写指令:00，写指令码，高脉冲-先拉高在拉低 LCD1602_RW = 0; LCD1602_DB = cmd; LCD1602_E = 1; LCD1602_E = 0; } void LcdWritedat(unsigned char dat) //传递的是指针指向的数据 { LcdWaitReady(); LCD1602_RS = 1; //写指令:10，写指令码，高脉冲-先拉高在拉低 LCD1602_RW = 0; LCD1602_DB = dat; LCD1602_E = 1; LCD1602_E = 0; } void LedSetCursor(unsigned char x, unsigned char y)//坐标的设置 { unsigned char addr; if(y == 0) { addr = 0x00 + x; //第一行的起始位置00H } else addr = 0x40 +x; //第二行的起始位置40H LcdWriteCmd(addr | 0x80); //高位相或---固定在最高位屏幕最左端起始 } void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str) { LedSetCursor(x,y); //设置起始地址 while(str != '\0') { LcdWritedat(*str++); //先取STR 的地址再对地址++ } } void InitLcd1602() { LcdWriteCmd(0x38); //初始化显示模式0x38 LcdWriteCmd(0x0c); //不显示光标0x0c LcdWriteCmd(0x06); //数据指针设置--文字不动地址+1 LcdWriteCmd(0x01); //显示清屏 }