LM75A程序解析數(shù)字式溫度傳感器

1、2011-01-2915:14:13|分類：默認(rèn)分類|標(biāo)簽：lm75a工程師|字號(hào)訂閱最近在測(cè)試LM75A的過(guò)程中出現(xiàn)的問(wèn)題，從網(wǎng)上找來(lái)資料，調(diào)試發(fā)現(xiàn)都有問(wèn)題，所以啊思路可以參考別人的具體程序還是自己寫(xiě)吧呵呵！網(wǎng)上的兩個(gè)程序都有問(wèn)題，都是數(shù)據(jù)處理過(guò)程中的問(wèn)題：第一篇網(wǎng)上的帖子：在如今什么芯片都在漲價(jià)就是工資沒(méi)漲價(jià)的情況下，看到LM75A比DS18B20還是便宜，有興趣的朋友可以考慮下，這是網(wǎng)上資料，本人沒(méi)測(cè)試LM75A是PHILPS公司生產(chǎn)的數(shù)字溫度傳感器及看門(mén)狗。通過(guò)片內(nèi)集成的帶隙溫度傳感器和工-數(shù)摸轉(zhuǎn)換器來(lái)實(shí)現(xiàn)數(shù)字溫度的測(cè)量，并通過(guò)該溫度傳感器為用戶提供溫度超限報(bào)警輸出。LM75A內(nèi)部包含

2、多個(gè)數(shù)據(jù)寄存器:配置寄器(Conf):用來(lái)存儲(chǔ)器件的配置，如:器件工作模式、OS工作模式、OS極性和OS故障隊(duì)列;(2)溫度寄存器(Temp):用于存儲(chǔ)讀取的數(shù)字溫度;(3)設(shè)定點(diǎn)寄存器(Tos&Thyst):用來(lái)存儲(chǔ)可編程的過(guò)熱關(guān)斷和滯后限制。器件通過(guò)2線的串行I2C總線接口與控制器通信。LM75A包含一個(gè)開(kāi)漏輸出(OS)，當(dāng)溫度超過(guò)編程限制的值時(shí)該輸出有效。LM75A有3個(gè)可選的邏輯地址管腳，使得同一總線上可同時(shí)掛8個(gè)LM75A而無(wú)需其他硬件的支持CPU：STC89C54RD+晶震：11.0592MA0A1A2均接地地址設(shè)置為0OS腳和INTO相連并通過(guò)10K上拉到VCC；當(dāng)轉(zhuǎn)換溫度超過(guò)極

3、限溫度，輸出中斷蜂鳴器報(bào)警；刷新數(shù)碼管顯示溫度共5位前一位表示正負(fù)溫度后三位為溫度125-55最后一位為0.1度最高可精確到0.125數(shù)碼管圖略(看程序應(yīng)該會(huì)知道)定時(shí)器100MS采集溫度一次#include#include#includesbitxiaoshu=P2A0;/COM口sbitge=P2A1;sbitshi=P2A3;sbitbai=P2A4;sbitfh=P2A5;sbitSDA_LM75=P1A0;數(shù)據(jù)sbitSCL_LM75=P1A1;sbitBP=P2A1;bitdp=0;unsignedcharJS=0;#defineLEDP0/8位數(shù)碼管動(dòng)態(tài)時(shí)時(shí)刷新#defineCO

4、NF0X01/配置寄存器#defineTEMP0X00/溫度寄存器只讀#defineALARM0X03超溫關(guān)閉極限寄存器默認(rèn)5000H#defineDELAY0X02滯后寄存器默認(rèn)4B00H#defineWADDR0X90/寫(xiě)地址#defineRADDR0X91/讀地址unsignedinttempdata=0;/全局變量申明溫度unsignedcharcodetab=0 x3f,0 x30,0 x6d,0 x79,0 x72,0 x5b,0 x5f,0 x31,0 x7f,0 x7b,0 x40;共陰TOC o 1-5 h z/0,1,23456789/unsignedchartab=0 x

5、c0,0 xf9,0 xa4,0 xb0,0 x99,0 x92,0 x82,0 xf8,0 x80,0 x90;/共陽(yáng)/0,1,23456789unsignedcharcodetabdp=0 xbf,0 xb0,0 xed,0 xf9,0 xf2,0 xdb,0 xdf,0 xb1,0 xff,0 xfb,0 xc0;/共陰帶小數(shù)點(diǎn)/0,1,23456789/unsignedchartabdp=0 x40,0 x79,0 x24,0 x30,0 x19,0 x12,0 x02,0 x78,0 x00,0 x10;/共陽(yáng)voiddelay_xms(unsignedintcount)/延時(shí)函數(shù)r

6、egisterunsignedcharj;while(count-)for(j=0;j125;j+)/約1MSvoidLed_Display(unsignedinti,bitmode)/顯示函數(shù)if(mode)LED=0 x40;/共陰負(fù)/LED=0 xBF;elseLED=0 x00;/LED=0XFF;fh=1;bai=0;shi=0;ge=0;xiaoshu=0;delay_xms(1);LED=tabi/1000;i%=1000;fh=0;bai=1;shi=0;ge=0;xiaoshu=0;delay_xms(1);LED=tabi/100;i%=100;fh=0;bai=0;shi

7、=1;ge=0;xiaoshu=0;delay_xms(1);LED=tabdpi/10;/帶小數(shù)點(diǎn)fh=0;bai=0;shi=0;ge=1;xiaoshu=0;delay_xms(1);LED=tabi%10;fh=0;bai=0;shi=0;ge=0;xiaoshu=1;delay_xms(1);voiddelay(void)/延時(shí)函數(shù)_nop_();_nop_();_nop_();_nop_();_nop_();voidstart_lm75(void)起始SDA_LM75=1;SCL_LM75=1;delay();SDA_LM75=0;delay();SCL_LM75=0;voidst

8、op_lm75(void)停止SDA_LM75=0;SCL_LM75=1;delay();SDA_LM75=1;delay();SCL_LM75=0;voidCheck_Ack(void)/檢查應(yīng)答信號(hào)SDA_LM75=1;SCL_LM75=1;F0=0;delay();if(SDA_LM75)/如果數(shù)據(jù)為高置位非應(yīng)答標(biāo)志FOF0=1;/通用標(biāo)志位PSW狀態(tài)寄存器SCL_LM75=0;/準(zhǔn)備下一變化數(shù)據(jù)voidAck(void)/發(fā)響應(yīng)信號(hào)SDA_LM75=0;delay();SCL_LM75=1;delay();SCL_LM75=0;voidno_Ack(void)/發(fā)非響應(yīng)信號(hào)SDA_LM

9、75=1;SCL_LM75=0;delay();SCL_LM75=1;/迫使數(shù)據(jù)傳輸結(jié)束delay();voidsend_byte(unsignedchartemp)/發(fā)送一字節(jié)數(shù)據(jù)unsignedchari=8;while(i-)SDA_LM75=(bit)(temp&0 x80);SCL_LM75=1;delay();SCL_LM75=0;temp=1;SCL_LM75=0;delay();SDA_LM75=1;/釋放SDA數(shù)據(jù)線unsignedcharread_byte(void)/讀一字節(jié)數(shù)據(jù)unsignedchari=8;unsignedchartemp;while(i-)temp8

10、);datalow=(unsignedchar)(tempdata&0 x00FF);start_lm75();send_byte(WADDR);Check_Ack();if(F0)no_Ack();return;Ack();send_byte(addr);Check_Ack();if(F0)no_Ack();return;Ack();send_byte(datahigh);send_byte(datalow);Check_Ack();if(F0)no_Ack();return;Ack();delay();stop_lm75();unsignedcharread_chardata(unsign

11、edcharaddr)/讀8位寄存器unsignedchartemp;start_lm75();send_byte(WADDR);Check_Ack();if(F0)no_Ack();return0;Ack();send_byte(addr);Check_Ack();if(F0)no_Ack();return0;Ack();send_byte(RADDR);Check_Ack();if(F0)no_Ack();return0;Ack();temp=read_byte();stop_lm75();return(temp);unsignedintread_intdata(unsignedchara

12、ddr)/讀16位寄存器/unsignedchartemphigh,templow;原函數(shù)使用的是無(wú)符號(hào)字符型，8位unsignedinttemphigh,templow;/改成了無(wú)符號(hào)整形16位start_lm75();send_byte(WADDR);Check_Ack();if(F0)no_Ack();return0;Ack();send_byte(addr);Check_Ack();if(F0)no_Ack();return0;Ack();send_byte(RADDR);Check_Ack();if(F0)no_Ack();return0;Ack();temphigh=read_by

13、te();templow=(read_byte()&0 xe0;stop_lm75();if(!(temphigh&0 x80)dp=0;return(temphigh5);/如果使用的是8位字符型temphigh的話左移過(guò)程中數(shù)據(jù)已經(jīng)全部丟了！elsedp=1;return(0 x800-(temphigh5);voidinitial()/初始化LM75AWrite_chardata(CONF,0X20);/0S中斷模式，溫度轉(zhuǎn)換正常模式Write_intdata(ALARM,0 x3300);/100度極限由高9位有效位組成BIT15為1表示為負(fù)為0表示為正超過(guò)100度觸發(fā)外部中斷0Wri

14、te_intdata(DELAY,0X4A80);/95度后不報(bào)警voidint0_int()interrupt0using1/外部中斷0服務(wù)函數(shù)BP=0;delay_xms(1000);BP=1;delay_xms(1000);voidt0_int()interrupt1using1/定時(shí)器0中斷服務(wù)函數(shù)TR0=0;TH0=0 xdc;/10MS中斷初值TL0=0 xff;TR0=1;JS+;if(JS10)/加到10為100MSJS=0;tempdata=read_intdata(TEMP);/采集數(shù)據(jù)tempdata=(tempdata/8)*10;/轉(zhuǎn)換為溫度voidmain()/入口

15、函數(shù)IP=0X01;TMOD=0X01;TH0=0 xdc;/10MS中斷初值TL0=0 xff;IT0=0;/外部中斷0采用電平觸發(fā)ET0=1;TR0=1;/開(kāi)放定時(shí)器0中斷EX0=1;EA=1;initial();while(1)if(dp)Led_Display(tempdata,1);elseLed_Display(tempdata,0);第二個(gè)程序，問(wèn)題同樣出現(xiàn)在數(shù)據(jù)處理中?。?main主函數(shù)/*main.cLM75A數(shù)字溫度計(jì)*/#includeDisp.h#includeI2C.h#include#include/*函數(shù)：Delay()功能：延時(shí)1ms65.536s參數(shù)：t0時(shí)，

16、延時(shí)(t*O.OO1)st=0時(shí)，延時(shí)65.536s*/voidDelay(unsignedintt)doTH0=0 xFC;TL0=0 x66;TR0=1;while(!TF0);TR0=0;TF0=0;while(-t!=0);/*函數(shù)：SysInit()功能：系統(tǒng)初始化*/voidSysInit()TMOD&=0 xF0;TMOD|=0 x01;設(shè)置TO為16位定時(shí)器DispInit();/數(shù)碼管掃描顯示初始化l2C_lnit();初始化I2C總線/*函數(shù)：ByteToStr()功能：字節(jié)型變量c轉(zhuǎn)換為十進(jìn)制字符串*/voidByteToStr(unsignedcharidata*s,u

17、nsignedcharc)codeunsignedcharTab=100,10;unsignedchari;unsignedchart;for(i=0;i2;i+)t=c/Tabi;*s+=0+t;c-=t*Tabi;*s+=0+c;*s=0;/*函數(shù)：LM75A_GetTemp功能：讀出LM75A的溫度值返回：LM75A溫度寄存器的數(shù)值(乘以0.125可得到攝氏度值)*/intLM75A_GetTemp()unsignedcharbuf2;intt;I2C_Gets(0 x90,0 x00,2,buf);t=buf0;t=5;/去掉無(wú)關(guān)位右移8位后再左移高位始終是0正負(fù)將無(wú)法判斷returnt;/*函數(shù)：DispTemp()功能：在數(shù)碼管上顯示出溫度值參數(shù)：t：補(bǔ)碼，除以8以后才是真正溫度值*/voidDispTemp(intt)codeunsignedcharTab84=000,125,250,375,500,625,750,875;unsignedcharbuf4;bits;/符號(hào)位unsignedchari;/整數(shù)部分unsignedchard;/小數(shù)部分unsignedcharx;/