ds18b20.c

1-wire协议实现

/**********************DS18B20 基本控制函数******************************
[文件名] DS18B20.c+DS18B20.H
[版本] TV0.1
[修正] hxc 
hxc last change time 2006.03.03 x:x
hxc last check time 2006.4.14 16:46
[功能说明]：
***************************************************************************/
#include "ASMselect.h"
#if ASMds18b20
#include <reg51x.h>
#include <tab.h>
#include <1-wire.h>
#include <stdio.h>
#include "ds18b20.h"
extern uchar idata digital_LED[6];
 unsigned char code displaydata_table[] = {
	0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff,	//9.=9+10=19(0x10)
	0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};//0 1 2 3---9 ,'-' "off",  0. 1. 2. 3. ---9. ,have  radix point +12
 uchar  idata ds18b20id[8];//save ds18b20 rom_id
 uchar  idata ds2415id[8];//save ds2415 ID timer chip
//==================================ID_read_store=======================================
//=read on wire all device rom_id, have ds18b20 save to ds18b20id[8],not is save 1320id=
ID_read_store(){

	uchar ip;
	uchar jp;
	uchar *idflag;
	extern unsigned char idata ROM_ID[8];//rom_id[0] is 8bit family,rom_id[1~6]48bit ID,rom_id[8] 8 bit CRC
	for(ip=0;ip<2;ip++){//read rom_id ->
		if(WIRE_id_read(searchid_command)){
			if(ROM_ID[0]==0X28){
				idflag=ds18b20id;
				}
				else {
					idflag=ds2415id;
					}
				for (jp=0;jp<8;jp++){
				*idflag=ROM_ID[jp];
				idflag++;	
					}
			}
			else {break;}
		}
}
//==================================Id_matching======================================
//======-matching rom id(tx matching comand +*device_id)=============================
	//-------------------------------- 
	Id_matching(uchar *device_id){
	uchar im;
	WIRE_reset();
	WIRE_tx_8(matchingid_command);
	for (im=0;im<8;im++){
	//	printf("%bx,",*device_id);
		WIRE_tx_8(*device_id);
		device_id++;
	}
	//printf("\n");
	}
//===========================DS18B20_config_store_eeporm=============================
//==config ds18b20(parameterTH,TL,Contgreg), store to DS18B20 EEPROM=================
//---------------------------------
#if ASMDS18B20_config_store
DS18B20_config_store_eeporm(uchar TH,char TL,uchar ContgReg){


	//char TH;						//temperature > TH  warn
	//char TL;						//temperature< TL warn
	//uchar ContgReg;				//temperature precision ( 0 R1 R0 1 1111); R1 R0=(00) 9 bit time 93.75ms 0.5'C
								//=(0 1) 10bit 0.25'C 187.5ms  =(1 0) 375ms 0.125'C =(1 1) 12bit 750ms 0.0625'C
	uchar ics;
	uchar idata configure[3];
					//---------------config write ds18b20
	Id_matching(ds18b20id);
	//TH=27;			//high 'C
	//TL=-1;				//low 'C
	//ContgReg=0X7F;		//12bit precision
	configure[0]=TH;
	configure[1]=TL;
	configure[2]=ContgReg;
	WIRE_tx_8(write_ds18b20);
	for(ics=0;ics<3;ics++){
		WIRE_tx_8(configure[ics]);
		}
					//--------------storage config data to ds18b20 eeprom
	Id_matching(ds18b20id);
	WIRE_tx_8(copy_to_EEPROM);	//data copy to eeprom
	wire_power_cmos=1;			//pu high ,gave wire device current
	DELAY_X(750);				//delay 10ms+2ms
	wire_power_cmos=0;
	WIRE_rx_1();			//COPY OK		
	}

	//------------------------------look ds18b20 power mode
	/*	bit vcc_power_mode;
	WIRE_tx_8(read_power_mode);
	vcc_power_mode=WIRE_rx_1();
	printf("ds18b20powermode:%d",(int)(vcc_power_mode));*/

 
#endif
//==================================tem_switch====================================
//================================temperature switch ================================		
	tem_switch(){
	Id_matching(ds18b20id);
	//------------------------------------temperature switch
	WIRE_tx_8(temperature_switch);	
	wire_power_cmos=1;
	//DELAY_X(32766);				//delay 500ms +24ms
	//DELAY_X(8000);
	
		}
//==================================tem_red_ouput=================================
//========================== read temperature ,process and print=========================
	tem_read_ouput(){
	//------------------------------------read temperature
	uchar it;
	bit temperature_negative;	//temperature negative =1 is' -',=0 si ' +'
	uchar idata contgarray[9];			//read  temperature value
	uchar temperature_integer;	//temperature integer
	uint temperature_decimal;	//temperature decimal 
	float temperature_f;			//temperature float 
	uchar idata disp_tem[6];			//temperature digital_LED data
	uchar hundred_uc,denary_uc;
	uchar decimal_uc1000;
	wire_power_cmos=0;
	Id_matching(ds18b20id);
	WIRE_tx_8(read_ds18b20);
	for (it=0;it<9;it++){
	contgarray[it]=WIRE_rx_8();
		//	printf("\ncontgarray=%bx",contgarray[it]);//OUPUT  READ DS18B20 DATA 
		}
	if (WIER_crc(contgarray,9)==0){//if temperature crc check error not process display update
	
	//--------------- temperature process and output------------------------
	  temperature_negative=0;
	  if (contgarray[1]>0x80){ 							//if negative ,~x+1 process	
		contgarray[1]=~contgarray[1];
		contgarray[0]=~contgarray[0];
		contgarray[0]++;
		if (contgarray[0]==0){contgarray[1]++;}
		temperature_negative=0;
		}
		contgarray[1]=(contgarray[1]<<4)&0xf0;			//process integer
		temperature_integer=(contgarray[0]>>4)&0x0f;
		temperature_integer|=contgarray[1];
		temperature_f=0;
		temperature_decimal=0;
		if((bit)(contgarray[0]&0x01)){temperature_decimal=625;temperature_f+=0.0625;}			//process decimal bit
		if((bit)(contgarray[0]&0x02)){temperature_decimal+=1250;temperature_f+=0.125;}
		if((bit)(contgarray[0]&0x04)){temperature_decimal+=2500;temperature_f+=0.25;}
		if((bit)(contgarray[0]&0x08)){temperature_decimal+=5000;temperature_f+=0.5;}
		printf("\nt=");						//output temperature
		if (temperature_negative)
			{printf("-");				//+-negative out					
			disp_tem[0]=10;}			//have '-' dispaly '-'~~~7~~~
		 else{disp_tem[0]=11;}		//not '-' dispaly 'off'~~~7~~~~
		printf("%d.",(int)(temperature_integer));	
							//~~~~~7~~~~~~~<
		 denary_uc=temperature_integer;		//SEVEN display process
		 hundred_uc=temperature_integer/100;
		 if (hundred_uc){
		 	disp_tem[0]=1;
			denary_uc=temperature_integer-100; //if on hundred bit  have amout '1' ,not display "-"or 'off',display "1"
			 disp_tem[1]=denary_uc/10;			//denary display
		 	}
		else{
		 disp_tem[1]=denary_uc/10;
			if(denary_uc/10==0)disp_tem[1]=11 ; //not hundred bit, on denary bit is '0' ,dispaly off
			}
		 disp_tem[2]=temperature_integer%10+12;//unit bit display+radix point
		decimal_uc1000=temperature_decimal/1000;
		disp_tem[3]=decimal_uc1000;
		 if (disp_tem[3]==0){disp_tem[3]=0;}
		disp_tem[4]=(temperature_decimal/100)%10;
		disp_tem[5]=(temperature_decimal/10)%10;
					 		//~~~~~~7~~~~~>
		if (temperature_decimal==625)
			{printf("0");			//decimal + 0
			}
		printf("%d\'c\n",temperature_decimal);
		temperature_f+=temperature_integer; //conversion float count
		if (temperature_negative)temperature_f=(-1)*temperature_f;
		if (temperature_f!=85){
		printf("t=%f\'C\n",temperature_f);					//float output
		for (it=0;it<6;it++){
			digital_LED[it]=displaydata_table[ disp_tem[it]];
			}
			}
	  }
	}

#endif