基于51单片机的18b20温度传感器+红外通信.zip

/* ******************************************************************************* * 《手把手教你学51单片机(C语言版)》 * 配套 KST-51 单片机开发板 示例源代码 * * (c) 版权所有 2014 金沙滩工作室/清华大学出版社 保留所有权利 * 获取更多资料请访问：http://www.kingst.org * * 文件名：main.c * 描 述：第16章 作业题4 带温度显示的电子钟 * 版本号：v1.0.0 * 备 注：在lesson15_3基础上添加温度，温度显示在第二行右端，原时间位置相应左移 ******************************************************************************* */ #include <reg52.h> struct sTime { //日期时间结构体定义 unsigned int year; unsigned char mon; unsigned char day; unsigned char hour; unsigned char min; unsigned char sec; unsigned char week; }; bit flag1s = 0; //1s定时标志 bit flag200ms = 1; //200ms定时标志 struct sTime bufTime; //日期时间缓冲区 unsigned char setIndex = 0; //时间设置索引 unsigned char T0RH = 0; //T0重载值的高字节 unsigned char T0RL = 0; //T0重载值的低字节 void ConfigTimer0(unsigned int ms); void RefreshTimeShow(); void GetShowTemp(); extern void InitDS1302(); extern void GetRealTime(struct sTime *time); extern void SetRealTime(struct sTime *time); extern void KeyScan(); extern void KeyDriver(); extern void InitLcd1602(); extern void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str); extern void LcdSetCursor(unsigned char x, unsigned char y); extern void LcdOpenCursor(); extern void LcdCloseCursor(); extern bit Start18B20(); extern bit Get18B20Temp(int *temp); void main() { unsigned char psec=0xAA; //秒备份，初值AA确保首次读取时间后会刷新显示 EA = 1; //开总中断 ConfigTimer0(1); //T0定时1ms Start18B20(); //启动DS18B20 InitDS1302(); //初始化实时时钟 InitLcd1602(); //初始化液晶 //初始化屏幕上固定不变的内容 LcdShowStr(3, 0, "20 - - "); LcdShowStr(1, 1, " : : --`C"); while (1) { KeyDriver(); //调用按键驱动 if (flag200ms && (setIndex == 0)) { //每隔200ms且未处于设置状态时， flag200ms = 0; GetRealTime(&bufTime); //获取当前时间 if (psec != bufTime.sec) //检测到时间有变化时刷新显示 { RefreshTimeShow(); psec = bufTime.sec; //用当前值更新上次秒数 } } if (flag1s && (setIndex == 0)) //每隔1s读取并显示温度 { flag1s = 0; GetShowTemp(); } } } /* 将一个BCD码字节显示到屏幕上，(x,y)-屏幕起始坐标，bcd-待显示BCD码 */ void ShowBcdByte(unsigned char x, unsigned char y, unsigned char bcd) { unsigned char str[4]; str[0] = (bcd >> 4) + '0'; str[1] = (bcd&0x0F) + '0'; str[2] = '\0'; LcdShowStr(x, y, str); } /* 获取并显示温度 */ void GetShowTemp() { int temp; unsigned char str[4]; if (Get18B20Temp(&temp)) //读取当前温度并判断是否成功 { //读取成功时，刷新当前温度显示 temp >>= 4; //右移4位以舍弃小数位 str[0] = temp/10 + '0'; //显示为两位十进制数字 str[1] = temp%10 + '0'; str[2] = '\0'; LcdShowStr(11, 1, str); } else { //读取失败时，提示错误信息 LcdShowStr(11, 1, "--"); } Start18B20(); //重新启动下一次转换 } /* 刷新日期时间的显示 */ void RefreshTimeShow() { ShowBcdByte(5, 0, bufTime.year); ShowBcdByte(8, 0, bufTime.mon); ShowBcdByte(11, 0, bufTime.day); ShowBcdByte(1, 1, bufTime.hour); ShowBcdByte(4, 1, bufTime.min); ShowBcdByte(7, 1, bufTime.sec); } /* 刷新当前设置位的光标指示 */ void RefreshSetShow() { switch (setIndex) { case 1: LcdSetCursor(5, 0); break; case 2: LcdSetCursor(6, 0); break; case 3: LcdSetCursor(8, 0); break; case 4: LcdSetCursor(9, 0); break; case 5: LcdSetCursor(11, 0); break; case 6: LcdSetCursor(12, 0); break; case 7: LcdSetCursor(1, 1); break; case 8: LcdSetCursor(2, 1); break; case 9: LcdSetCursor(4, 1); break; case 10: LcdSetCursor(5, 1); break; case 11: LcdSetCursor(7, 1); break; case 12: LcdSetCursor(8, 1); break; default: break; } } /* 递增一个BCD码的高位 */ unsigned char IncBcdHigh(unsigned char bcd) { if ((bcd&0xF0) < 0x90) bcd += 0x10; else bcd &= 0x0F; return bcd; } /* 递增一个BCD码的低位 */ unsigned char IncBcdLow(unsigned char bcd) { if ((bcd&0x0F) < 0x09) bcd += 0x01; else bcd &= 0xF0; return bcd; } /* 递减一个BCD码的高位 */ unsigned char DecBcdHigh(unsigned char bcd) { if ((bcd&0xF0) > 0x00) bcd -= 0x10; else bcd |= 0x90; return bcd; } /* 递减一个BCD码的低位 */ unsigned char DecBcdLow(unsigned char bcd) { if ((bcd&0x0F) > 0x00) bcd -= 0x01; else bcd |= 0x09; return bcd; } /* 递增时间当前设置位的值 */ void IncSetTime() { switch (setIndex) { case 1: bufTime.year = IncBcdHigh(bufTime.year); break; case 2: bufTime.year = IncBcdLow(bufTime.year); break; case 3: bufTime.mon = IncBcdHigh(bufTime.mon); break; case 4: bufTime.mon = IncBcdLow(bufTime.mon); break; case 5: bufTime.day = IncBcdHigh(bufTime.day); break; case 6: bufTime.day = IncBcdLow(bufTime.day); break; case 7: bufTime.hour = IncBcdHigh(bufTime.hour); break; case 8: bufTime.hour = IncBcdLow(bufTime.hour); break; case 9: bufTime.min = IncBcdHigh(bufTime.min); break; case 10: bufTime.min = IncBcdLow(bufTime.min); break; case 11: bufTime.sec = IncBcdHigh(bufTime.sec); break; case 12: bufTime.sec = IncBcdLow(bufTime.sec); break; default: break; } RefreshTimeShow(); RefreshSetShow(); } /* 递减时间当前设置位的值 */ void DecSetTime() { switch (setIndex) { case 1: bufTime.year = DecBcdHigh(bufTime.year); break; case 2: bufTime.year = DecBcdLow(bufTime.year); break; case 3: bufTime.mon = DecBcdHigh(bufTime.mon); break; case 4: bufTime.mon = DecBcdLow(bufTime.mon); break; case 5: bufTime.day = DecBcdHigh(bufTime.day); break; case 6: bufTime.day = DecBcdLow(bufTime.day); break; case 7: bufTime.hour = DecBcdHigh(bufTime.hour); break; case 8: bufTime.hour = DecBcdLow(bufTime.hour); break; case 9: bufTime.min = DecBcdHigh(bufTime.min); break; case 10: bufTime.min = DecBcdLow(bufTime.min); break; case 11: bufTime.sec = DecBcdHigh(bufTime.sec); break; case 12: bufTime.sec = DecBcdLow(bufTime.sec); break; default: break; } RefreshTimeShow(); RefreshSetShow(); } /* 右移时间设置位 */ void RightShiftTimeSet() { if (setIndex != 0) { if (setIndex < 12) setIndex++; else setIndex = 1; RefreshSetShow(); } } /* 左移时间设置位 */ void LeftShiftTimeSet() { if (setIndex != 0) { if (setIndex > 1) setIndex--; else setIndex = 12; RefreshSetShow(); } } /* 进入时间设置状态 */ void EnterTimeSet() { setIndex = 2; //把设置索引设置为2，即可进入设置状态 LeftShiftTimeSet(); //再利用现成的左移操作移到位置1并完成显示刷新 LcdOpenCursor(); //打开光标闪烁效果 } /* 退出时间设置状态，save-是否保存当前设置的时间值 */ void ExitTimeSet(bit save) { setIndex = 0; //把设置索引设置为0，即可退出设置状态 if (save) //需保存时即把当前设置时间写入DS1302 { SetRealTime(&bufTime); } LcdCloseCursor(); //关闭光标显示 } /* 按