DS2431DS18B20读写程序

1、DS2431DS18B20onewire读写程序最近公司有一个产品用到了DS2431,我就将先前一个DS18B20的程序中加入了DS2431的按规定函数。先传给大家分享.大家可以使用，转载时请说明出处.此程序不够完善，希望能支持多节点设备连接。单总线适用于单，能够控制一个或多个从机设备。主机可以是微控制器，从机可以是单总线器件，它们之间的数据交换只通过一条信号线。当只有一个从机设备时，系统可按单节点系统操作；当有多个从机设备时，系统则按多节点系统操作。以下是程序：# incIude"system,h"# incIude"onewire.h"unsigne

2、dchara_DS24318;/codebyIyxandRyanHsiung# defineDS_DQ_INPORTAbits.RA4# defineDS_DQ_OUTLATAbits.LATA4# defineDS_DQ_TRISDTRISAbits.TRISA4voiddeIay_us(unsignedchartime)/deIayms=1usof20Mhzosc/不准确1uswhiIe(time);CRC校验unsignedcharcrccheck(unsignedchar*p,unsignedcharIen)1unsignedcharbitO,cbit,r,temp,i,j,byte;

3、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=cbit'bitO;if(r=1)temp=temp"0x8c;byte=byte»1;returntemp;/xJn z|x xjx x|x Jx xjx xj>检查DS1820是否存在:如果DS1820不存在返回1,否则返回0/zjs/unsignedcharOneWire_ack(void)(unsignedcharack;DS_DQ_

4、TRISDR;/输/出DS_DQ_OUT=O;/输/出LOW/deIay_us(500);deIay_us(250);deIay_us(250);deIay_us(100);DS_DQ_0UT=1;/输/出HIGHDS_DQ_TRISD=1;/RE2输入delay_us(40);/deIay_us(45);if(DSDQIN=1)ack=1;/«MB,eIseack=O;/deIay_us(500);deIay_us(250);deIay_us(250);deIay_us(100);returnack;/从DS1820读1字节数据unsignedcharOneWire_read(vo

5、id),unsignedchari,byte,temp;byte=0x00;for(i=0;i<8;i+)DS_DQ_TRISD=O;/RE2输出DS_DQ_OUT=0;/输/出LOWdelay_us(1);/delay_us(3);DS_DQ_0UT=1;/输/出HIGHDS_DQ_TRISD=1;/RE2输入delay_us;/delay_us(10);if(DS_DQ_IN)byte|=0x80;/读入if(i<7)byte=byte»1;delay_us(120);/delay_us(100);DS_DQ_TRISD=O;/RE2输出deIay_us;/deIay

6、_us(5);returnbyte;/1写ROM或存贮器命令到彳IJ<J/IIJII/voidOneWire_write(unsignedcharcmd)(unsignedchari,j;DS_DQ_TRISD=O;/RE2输出for(j=0;j<=7;j+)(i=cmd&0x01;if(i=0x01)(DS_DQ_OUT=O;/输/出LOWdelay_us(5);DS_DQ_OUT=1;/输/出HIGHdelay_us(120);eIseIDS_DQ_OUT=O;/输/出LOWdelay_us(120);DS_DQ_0UT=1;/输/出HIGHdelay_us(5);cm

7、d=cmd»1;匹配DS1820voidOneWire_match(unsignedchar*p)unsignedchari;doi=0neWire_ack();while(i=0x01);OneWire_write(0x55);for(i=0;i<8;i+)OneWire_write(pi);uint8DS2431_WriteOneByte(uint16address,uint8*p_data)1uint8tem8h,tem81,i,data,errors,temp8;tem8h=(unsignedchar)(address»=4);tem81=(unsignedc

8、har)address;if(OneWire_ack()return;/跳过ROM匹配/发送写暂存器 命令/发送地址低 17OneWire_write(Oxcc);OneWire_write(OxOf);OneWire_write(tem81);OneWire_write(tem8h);for(i=0;i<8;i+)Idata=*p_data;p_data+;OneWirewrite(data);/ClrWDTO；deIay_us(25);i千(OneWire_ack()return;OneWire_write(Oxcc);/跳过ROM匹配复制暂存器数据到存储OneWire_write(

9、OxAA);/temp8=0neWire_read();temp8«=8;temp8+=0neWire_read();errors=OneWire_read0；if(errors!=0x07)returnO;i千(OneWire_ack()return;/跳过ROM匹配/发出启动转换命令/发送地址低位/发送地址高位等待写时序结束510usOneWire_write(Oxcc);OneWire_write(0x55);OneWire_write(tem81);OneWire_write(tem8h);OneWire_write(errors);for(i=0;i<50;i+)de

10、lay_us(100);/if(OneWireread()!=OxAA)returnO;returnl;/*unsignedchari=1;if(OneWire_ack()return;OneWire_write(Oxcc);/旦先过ROMOneWire_write(OxOf);/writescrachpadOneWire_write(0x20);/ta1OneWire_write(0x00);/ta2OneWire_write(data);/dataa_DS24310=0neWire_read();a_DS24311=0neWire_read();crccheck(a_DS2431,2);*

11、/uint8DS2431_WriteString(uint16address,uint8*p_data)iuint8tem8h,tem81,i,data,errors,temp8;tem8h=(unsignedchar)(address»=4);tem81=(unsignedchar)address;/跳过ROM匹配/发送写暂存器 命令/发送地址低i千(OneWire_ack()return;OneWire_write(Oxcc);OneWire_write(OxOf);OneWire_write(tem81);OneWire_write(tem8h);for(i=0;i<8;

12、i+)data=*p_data;p_data+;OneWire_write(data);IdeIay_us(25);i千(OneWire_ack()return;OneWi re_wr i te(Oxcc);/跳过ROM匹配复制暂存器数据到存储OneWire_write(OxAA);/temp8=0neWire_read();temp8«=8;temp8+=0neWire_read();errors=OneWire_read0；if(errors!=0x07)returnO;i千(OneWire_ack()return;/跳过ROM匹配/发出启动转换命令/发送地址低位/发送地址高位O

13、neWire_write(Oxcc);OneWire_write(0x55);OneWire_write(tem81);OneWire_write(tem8h);OneWire_write(errors);for(i=0;i<50;i+)delay_us(100);/returnO;returnl;/*unsignedchari=1;i千(OneWire_ack()return;OneWire_write(Oxcc);/旦先过ROMOneWire_write(OxOf);/writescrachpadOneWire_write(0x20);/ta1OneWire_write(0x00);

14、/ta2OneWire_write(data);/dataa_DS24310=OneWire_read0;a_DS24311=0neWire_read();crccheck(a_DS2431,2);*/uint8DS2431_ReadOneByte(uint16address)(i千(OneWire_ack()return;OneWire_write(Oxcc);/旦先过ROMOneWire_write(OxfO);/发出读存储器命令OneWire_write(LS_BYTE(address);/地址低8位OneWire_write(HS_BYTE(address);/地址高8位a_DS243

15、10=0neWire_read();/readdatareturna_DS24310;/*unsignedchari=1;i千(OneWire_ack()return;OneWi re_wr ite(Oxaa) ;/a DS2431 O=OneWire read 0/readtaia DS2431 1=0neWire read 0a DS2431 2=0neWire read 0a DS2431 3=0neWire read 0a DS2431 4=0neWire read 0a DS2431 5=0neWire read 0crccheck (&a DS2431 4, 2);*/re

16、adta2/reades/readdata/crc/CRCu i nt8*DS2431_ReadStr i ng (u i nt16addressuint8i ;i f (OneWi re ack () return;OneWi re wr ite (Oxcc) :/ 跳过 ROM 匹配OneWire_write(Oxf0);/发出读存储器命令OneWire_write(LS_BYTE(address);/地址低8位OneWire_write(HS_BYTE(address);/地址图8位for(i=8;i>0;i")/ClrWDT0；returna_DS2431;voidSt

17、art_convert_ds18b20(void)unsignedchari=1;i千(OneWire_ack()return;OneWi re wr ite (Oxcc) ;/ 跳过 ROM 匹配OneWire_write(0x44);/启动DS1820转换unsignedintRead_convert_ds18b20(unsignedcharfIag_Ianguage)unsignedchari;unsignedchar0neWire9:/存放从DS18B20读取的9字节数据unsignedintOneWire_temp;unsignedcharfIag_temp=0;if(OneWire

18、_ack()return0x5fff;OneWirewrite(Oxcc);/跳过ROM匹配OneWire_write(Oxbe):/读转换后温度值for(i=0;i<9;i+)OneWire_temp=OneWire1;OneWire_temp=OneWire_temp«8;OneWire_temp+=OneWire0;if(OneWire_temp&Oxf800)!=0)/判断是否小于0度IOneWire_temp="OneWire_temp;OneWire_temp+;fIag_temp=1;I0neWire_temp+=8;/四舍五入8*0.0625=0.52k90717OneWire_temp»=4;if(OneWire_temp>0)OneWir