DS2431 DS18B20讀寫程序

1、DS2431 DS18B20 one wire 讀寫程序最近公司有一個產(chǎn)品用到了DS2431,我就將先前一個DS18B20的程序中加入了DS2431的按規(guī)定函數(shù)。先傳給大家分享.大家可以使用，轉(zhuǎn)載時請說明出處. 此程序不夠完善，希望能支持多節(jié)點設(shè)備連接。單總線適用于單主機(jī)系統(tǒng)，能夠控制一個或多個從機(jī)設(shè)備。主機(jī)可以是微控制器，從機(jī)可以是單總線器件，它們之間的數(shù)據(jù)交換只通過一條信號線。當(dāng)只有一個從機(jī)設(shè)備時，系統(tǒng)可按單節(jié)點系統(tǒng)操作；當(dāng)有多個從機(jī)設(shè)備時，系統(tǒng)則按多節(jié)點系統(tǒng)操作。 以下是程序：#include"system.h"#include"one wire.h&quo

2、t;unsigned char a_DS24318;/code by lyx and RyanHsiung#define DS_DQ_IN PORTAbits.RA4#define DS_DQ_OUT LATAbits.LATA4#define DS_DQ_TRISD TRISAbits.TRISA4void delay_us(unsigned char time) /delayms=1us of 20Mhz osc /不準(zhǔn)確1us while(time-); /* CRC校驗*/unsigned char crccheck(unsigned char *p,unsigned char len

3、)unsigned char bit0,cbit,r,temp,i,j,byte;temp=0;for (j=0;j<len;j+) byte=pj; for(i=0;i<8;i+) cbit=temp&0x01; bit0=byte&0x01; temp=temp>>1; r=cbitbit0; if(r=1) temp=temp0x8c; byte=byte>>1; return temp;/* 檢查DS1820是否存在：如果DS1820不存在返回1，否則返回0*/unsigned char OneWire_ack(void) unsig

4、ned char ack; DS_DQ_TRISD=0; /輸出 DS_DQ_OUT=0; /輸出LOW /delay_us(500); delay_us(250); delay_us(250); delay_us(100); DS_DQ_OUT=1;/輸出HIGH DS_DQ_TRISD=1;/RE2輸入 delay_us(40);/delay_us(45); if(DS_DQ_IN=1) ack=1; / else ack=0;/ /delay_us(500); delay_us(250); delay_us(250); delay_us(100); return ack;/* 從DS18

5、20讀1字節(jié)數(shù)據(jù)*/ unsigned char OneWire_read(void) unsigned char i,byte,temp; byte=0x00; for (i=0;i<8;i+) DS_DQ_TRISD=0;/RE2輸出 DS_DQ_OUT=0;/輸出LOW delay_us(1);/delay_us(3); DS_DQ_OUT=1;/輸出HIGH DS_DQ_TRISD=1;/RE2輸入 delay_us(5);/delay_us(10); if(DS_DQ_IN) byte|=0x80; / 讀入 if (i<7) byte=byte>>1; de

6、lay_us(120);/delay_us(100); DS_DQ_TRISD=0;/RE2輸出 delay_us(2);/delay_us(5); return byte;/* 寫ROM或存貯器命令到DS1820*/void OneWire_write(unsigned char cmd) unsigned char i,j; DS_DQ_TRISD=0;/RE2輸出 for (j=0;j<=7;j+) i=cmd&0x01; if (i=0x01) DS_DQ_OUT=0;/輸出LOW delay_us(5); DS_DQ_OUT=1;/輸出HIGH delay_us(120

7、); else DS_DQ_OUT=0;/輸出LOW delay_us(120); DS_DQ_OUT=1;/輸出HIGH delay_us(5); cmd=cmd>>1; /* 匹配DS1820*/ void OneWire_match(unsigned char *p) unsigned char i; do i=OneWire_ack(); while (i=0x01); OneWire_write(0x55); for(i=0;i<8;i+) OneWire_write(pi); uint8 DS2431_WriteOneByte(uint16 address, ui

8、nt8 * p_data)uint8 tem8h,tem8l,i,data,errors,temp8;tem8h=(unsigned char)(address>>=4);tem8l =(unsigned char)address; if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0x0f);/發(fā)送寫暫存器命令OneWire_write(tem8l);/發(fā)送地址低位OneWire_write(tem8h);/發(fā)送地址高位 for(i=0;i<8;i+)data=*p_data;p_data+;

9、OneWire_write(data);/ClrWDT();delay_us(25); if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0xAA); /復(fù)制暫存器數(shù)據(jù)到存儲器中temp8=OneWire_read();temp8<<=8;temp8+=OneWire_read();errors=OneWire_read(); if(errors!=0x07)return 0; if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_wr

10、ite(0x55);/發(fā)出啟動轉(zhuǎn)換命令OneWire_write(tem8l);/發(fā)送地址低位OneWire_write(tem8h);/發(fā)送地址高位 OneWire_write(errors);for(i=0;i<50;i+)delay_us(100); /等待寫時序結(jié)束510usif(OneWire_read()!=0xAA)return 0;return 1;/*unsigned char i=1; if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0x0f); / write scrachpadOn

11、eWire_write(0x20); / ta1OneWire_write(0x00); / ta2OneWire_write(data); / dataa_DS24310 = OneWire_read();a_DS24311 = OneWire_read();crccheck(a_DS2431,2);*/uint8 DS2431_WriteString(uint16 address, uint8 * p_data)uint8 tem8h,tem8l,i,data,errors,temp8;tem8h=(unsigned char)(address>>=4);tem8l =(uns

12、igned char)address; if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0x0f);/發(fā)送寫暫存器命令OneWire_write(tem8l);/發(fā)送地址低位OneWire_write(tem8h);/發(fā)送地址高位 for(i=0;i<8;i+)data=*p_data;p_data+;OneWire_write(data);delay_us(25); if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0xA

13、A); /復(fù)制暫存器數(shù)據(jù)到存儲器中temp8=OneWire_read();temp8<<=8;temp8+=OneWire_read();errors=OneWire_read(); if(errors!=0x07)return 0; if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0x55);/發(fā)出啟動轉(zhuǎn)換命令OneWire_write(tem8l);/發(fā)送地址低位OneWire_write(tem8h);/發(fā)送地址高位 OneWire_write(errors);for(i=0;i<50

14、;i+)delay_us(100); /等待寫時序結(jié)束510usif(OneWire_read()!=0xAA)return 0;return 1;/*unsigned char i=1; if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0x0f); / write scrachpadOneWire_write(0x20); / ta1OneWire_write(0x00); / ta2OneWire_write(data); / dataa_DS24310 = OneWire_read();a_DS24311

15、 = OneWire_read();crccheck(a_DS2431,2);*/uint8 DS2431_ReadOneByte(uint16 address ) if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0xf0);/發(fā)出讀存儲器命令OneWire_write(LS_BYTE(address) );/地址低8位OneWire_write(HS_BYTE(address);/地址高8位a_DS24310 = OneWire_read(); / read datareturn a_DS24310;/*un

16、signed char i=1; if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0xaa); /a_DS24310 = OneWire_read(); / read ta1a_DS24311 = OneWire_read(); / read ta2a_DS24312 = OneWire_read(); / read es a_DS24313 = OneWire_read(); /read dataa_DS24314 = OneWire_read(); /crca_DS24315 = OneWire_read(

17、); /CRCcrccheck(&a_DS24314,2);*/uint8* DS2431_ReadString(uint16 address) uint8 i; if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0xf0);/發(fā)出讀存儲器命令OneWire_write(LS_BYTE(address) );/地址低8位OneWire_write(HS_BYTE(address);/地址高8位for(i=8;i>0;i-)a_DS24318-i=OneWire_read();/ClrWDT();re

18、turn a_DS2431;void Start_convert_ds18b20(void)unsigned char i=1; if(OneWire_ack() return;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0x44); /啟動DS1820轉(zhuǎn)換unsigned int Read_convert_ds18b20(unsigned char flag_language)unsigned char i;unsigned char OneWire9;/存放從DS18B20讀取的9字節(jié)數(shù)據(jù)unsigned int OneWire_temp;unsigned char flag_temp=0;if(OneWire_ack() return 0x5fff;OneWire_write(0xcc);/跳過ROM匹配OneWire_write(0xbe); /讀轉(zhuǎn)換后溫度值for (i=0