DS18B20 ID号搜索函数(C#)

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Threading; //Write by ZhuShiWei namespace WindowsFormsApplication1 { private bool Reset() //DS18B20 复位 { byte[] resetRom = { 0xE0 }; serialPort1.BaudRate = 9600; if (serialPort1.IsOpen) { serialPort1.Close(); } serialPort1.Open(); serialPort1.Write(resetRom, 0, 1); if (serialPort1.ReadByte() >= resetRom[0]) { serialPort1.Close(); return false; } serialPort1.Close(); serialPort1.BaudRate = 115200; serialPort1.Open(); serialPort1.DiscardInBuffer(); Delay(1000); return true; } private void Delay(int usecond) //延时 { int max, idx = 0; Thread.CurrentThread.Priority = ThreadPriority.Highest; float total = 10000 * usecond / value; max = (int)total; while (idx < max) { idx++; } Thread.CurrentThread.Priority = ThreadPriority.Normal; } //-----------------发送命令------------------------------- private void ConvertCommand(byte command1, byte[] command2) { byte seed = 0x01; for (int i = 0; i < 8; i++) { if ((command1 & seed) == 0) { command2[i] = 0x00; } else { command2[i] = 0xFF; } seed <<= 1; } } private void WriteCommand(byte command) { byte[] commandbyte = new byte[8]; ConvertCommand(command, commandbyte); if (!serialPort1.IsOpen) { serialPort1.Open(); } serialPort1.Write(commandbyte, 0, 8); } //--------------------发送DS18B20 的 ID 号---------------- private void ConvertRomID(byte[] rombyte, byte[] rombit) { for (byte i = 0; i < 8; i++) { byte seed = 0x01; for (byte j = 0; j < 8; j++) { if ((rombyte[i] & seed) == 0) { rombit[i * 8 + j] = 0x00; } else { rombit[i * 8 + j] = 0xFF; } seed <<= 1; } } } private void WriteRomID(byte[] rombyte) { byte[] rombit = new byte[64]; ConvertRomID(rombyte, rombit); serialPort1.Write(rombit, 0, 64); } //--------------------读写位--------------------------- private byte WriteOneBit(byte onebit) { byte[] bit0 = { 0x00 },bit1={0xFF}; if (!serialPort1.IsOpen) { serialPort1.Open(); } serialPort1.DiscardInBuffer(); if (onebit == 0) { serialPort1.Write(bit0, 0, 1); } else { serialPort1.Write(bit1, 0, 1); } Delay(100);return (byte)serialPort1.ReadByte(); } private byte WriteOneByte(byte onebyte) { byte[] byteone = { onebyte }; if (!serialPort1.IsOpen) { serialPort1.Open(); } serialPort1.DiscardInBuffer(); serialPort1.Write(byteone, 0, 1); Delay(100);return (byte)serialPort1.ReadByte(); } private byte ReadOneBit() { byte[] startbyte = { 0xFF }; if (!serialPort1.IsOpen) { serialPort1.Open(); } serialPort1.DiscardInBuffer(); serialPort1.Write(startbyte, 0, 1);Delay(100); return (byte)serialPort1.ReadByte(); } private byte ReadOneByte() { byte onebit, byteone = 0x00; for (int i = 0; i < 8; i++) { byteone >>= 1; //Delay(500); onebit = ReadOneBit(); if (onebit > 252) { byteone ^= 0x80; } } return (byte)byteone; } //==========================搜索ID号等功能函数=============================== unsafe private byte SearchRom(ref Stack<byte> lastdiff, byte* buffer) { byte bit,topvalue,tmpdata=0; if (!Reset()) { return over_time; } WriteCommand(search_rom); // ROM search command for(byte i=0;i<64;) { if ((i & 0x07) == 0) { tmpdata = *buffer; } { bit = ReadOneBit(); // read first bit if (bit > 252) { bit = 1; } else { bit = 0; } if (ReadOneBit() > 252) // x1 { if ( bit==1 ) { return data_err; } } // 11 -data error else if (bit ==0 ) // 00 { if (lastdiff.Count > 0) { topvalue = lastdiff.Pop(); lastdiff.Push(topvalue); if (i < topvalue) { if ((tmpdata & 0x01) == 1) { bit = 1; } } else if (i == topvalue) { lastdiff.Pop(); bit = 1; } else { lastdiff.Push(i); } }else { lastdiff.Push(i); } } WriteOneBit(bit); // write bit tmpdata >>= 1; // store bit if (bit == 1) { tmpdata |= 0x80; } } if ((++i & 0x07) == 0) { *buffer = tmpdata; buffer++; } // next byte } if (lastdiff.Count == 0) { return search_finish; } return search_continue; // to continue search } private void MatchRom(byte[] rombyte) { WriteCommand(match_rom); WriteRomID(rombyte); } private void ConvertTemp(byte[] rombyte) { MatchRom(rombyte); CheckPower(); WriteCommand(convert_temp); Delay(666666); } private void ConvertTemp() { WriteCommand(skip_rom); CheckPower(); WriteCommand(convert_temp); Delay(666666); } //============================================================== } }