1-wire+DS18B20+数码显示+Proteus+595温度测试C源码

/* ******************************************************************************* ** Include files ******************************************************************************* */ #include <iom16.h> #include <comp_a90.h> #include <avr_macros.h> #include <intrinsics.h> #include "onewire.h" //----------------------------------------------------------------------------- //Generate a 1-wire reset, return 1 of no presence detect was found, //return 0 otherwise. //(NOTE: Does not handle alarm presence for DS2404/DS1994) // /* **----------------------------------------------------------------------------- ** ** Abstract: ** This function is OneWire Reset. ** ** Parameters: ** None ** ** Returns: ** Return 1 of no presence detect was found, return 0 otherwise. ** **----------------------------------------------------------------------------- */ unsigned char OWTouchReset(void) { unsigned char result = 0; unsigned char i; DQOut_Low(); //Drives DQ_T low __delay_cycles(480*8); DQOutData = High; DQChangeInput(); //Releases the bus __delay_cycles(40*8); // result = DQ_T ^ 0x01; //Sample for presence pulse from slave i = 250; while(!DQ_T) { if(--i) result = 1; else { result = 0; break; } _NOP(); } __delay_cycles(300*8); return result; //Return sample presence pulse result } /* **----------------------------------------------------------------------------- ** ** Abstract: ** This function is Send a 1-wire bit. ** ** Parameters: ** provide 10us recovery time ** ** Returns: ** None ** **----------------------------------------------------------------------------- */ void OWWriteBit(unsigned char bit) { //write '1' bit DQOut_Low(); //Drives DQ_T low // delay1us(); __delay_cycles(8); DQOutData = bit; __delay_cycles(90*8); //Complete the time slot and 10us recovery DQChangeInput(); //Releases the bus __delay_cycles(30*8); } /* **----------------------------------------------------------------------------- ** ** Abstract: ** This function is Read a bit from the 1-wire bus return it. ** Provide 10us recovery time. ** Parameters: ** None ** ** Returns: ** Return a bit from the 1-wire bus. ** **----------------------------------------------------------------------------- */ unsigned char OWReadBit(void) { unsigned char result; DQOut_Low(); //Drives DQ_T low // delay1us(); DQChangeInput(); //Releases the bus __delay_cycles(10*8); _NOP();_NOP();_NOP(); result = DQ_T & 0x01; //Sample the bit value from the slave __delay_cycles(60*8); //Complete the time slot and 10us recovery return result; } /* ******************************************************************************* ** This is all for bit-wise manipulation of the 1-Wire bus.The above routines ** can be built upon to create byte-wise manipulator functions as seen in ** Example 3. ** Example 3.Derived 1-Wire Functions ******************************************************************************* */ /* **----------------------------------------------------------------------------- ** ** Abstract: ** This function is Wirte 1-Wire data byte. ** ** Parameters: ** None ** ** Returns: ** None ** **----------------------------------------------------------------------------- */ void OWWriteByte(unsigned char data) { unsigned char loop; //Loop to write each bit in the byte, LS-bit first for(loop = 8; loop != 0 ; loop--) { OWWriteBit(data & 0x01); data >>= 1; } } /* **----------------------------------------------------------------------------- ** ** Abstract: ** This function is Read 1-wire data byte and retrurn it. ** ** Parameters: ** None ** ** Returns: ** Return read 1-wire ** **----------------------------------------------------------------------------- */ unsigned char OWReadByte(void) { unsigned char loop,result = 0; for(loop = 8;loop != 0;loop --) { //Shift the result to get it ready for the nexit bit result >>= 1; //if result is one,then set MS bit if(OWReadBit()) result |= 0x80; } return result; } /* **----------------------------------------------------------------------------- ** ** Abstract: ** This function is Write a 1-wire data byte and return the ** sampled result. ** ** Parameters: ** Write value. ** ** Returns: ** return the sampled result. ** **----------------------------------------------------------------------------- */ unsigned char OWTouchByte(unsigned char data) { unsigned char loop,result = 0; for(loop = 8;loop != 0;loop --) { //Shift the result to get it ready for the next bit result >>= 1; //if sending a '1' then read a bit else write a '0' if(data & 0x01) { if(OWReadBit()) result |= 0x80; } else OWWriteBit(0); //Sfhift the data byte for the next bit data >>= 1; } return result; } /* **----------------------------------------------------------------------------- ** ** Abstract: ** This function is Wirte a block 1-wire data bytes and return ** the sampled result in the same buffer. ** ** Parameters: ** None ** ** Returns: ** Return the sampled result. ** **----------------------------------------------------------------------------- */ void OWOverdriveSkip(unsigned char *data,unsigned char data_len) { unsigned char loop; for( loop = 8; loop != 0; loop --) { data[loop] = OWTouchByte(data[loop]); } }