Plamen Totev / Mbed 2 deprecated peltier

peltier with 2 fans

Dependencies:   mbed TextLCD

DS18B20Multiple/DS18B20.cpp@4:5213bee8158e, 2014-04-14 (annotated)

Committer:
redplam
Date:
Mon Apr 14 02:15:32 2014 +0000
Revision:
4:5213bee8158e
myproject;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
redplam 4:5213bee8158e 1 /*
redplam 4:5213bee8158e 2 * DS18B20. Maxim DS18B20 One-Wire Thermometer.
redplam 4:5213bee8158e 3 * Uses the OneWireCRC library.
redplam 4:5213bee8158e 4 *
redplam 4:5213bee8158e 5 * Copyright (C) <2010> Petras Saduikis <petras@petras.co.uk>
redplam 4:5213bee8158e 6 *
redplam 4:5213bee8158e 7 * This file is part of OneWireThermometer.
redplam 4:5213bee8158e 8 *
redplam 4:5213bee8158e 9 * OneWireThermometer is free software: you can redistribute it and/or modify
redplam 4:5213bee8158e 10 * it under the terms of the GNU General Public License as published by
redplam 4:5213bee8158e 11 * the Free Software Foundation, either version 3 of the License, or
redplam 4:5213bee8158e 12 * (at your option) any later version.
redplam 4:5213bee8158e 13 *
redplam 4:5213bee8158e 14 * OneWireThermometer is distributed in the hope that it will be useful,
redplam 4:5213bee8158e 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
redplam 4:5213bee8158e 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
redplam 4:5213bee8158e 17 * GNU General Public License for more details.
redplam 4:5213bee8158e 18 *
redplam 4:5213bee8158e 19 * You should have received a copy of the GNU General Public License
redplam 4:5213bee8158e 20 * along with OneWireThermometer. If not, see <http://www.gnu.org/licenses/>.
redplam 4:5213bee8158e 21 */
redplam 4:5213bee8158e 22
redplam 4:5213bee8158e 23 #include "DS18B20.h"
redplam 4:5213bee8158e 24 //#include "DebugTrace.h"
redplam 4:5213bee8158e 25
redplam 4:5213bee8158e 26 //DebugTrace pc_ds18B20(OFF, TO_SERIAL);
redplam 4:5213bee8158e 27
redplam 4:5213bee8158e 28 DS18B20::DS18B20( PinName pin) :
redplam 4:5213bee8158e 29 OneWireThermometer(pin, DS18B20_ID)
redplam 4:5213bee8158e 30 {
redplam 4:5213bee8158e 31 }
redplam 4:5213bee8158e 32
redplam 4:5213bee8158e 33 void DS18B20::setResolution(eResolution resln)
redplam 4:5213bee8158e 34 {
redplam 4:5213bee8158e 35 // as the write to the configuration register involves a write to the
redplam 4:5213bee8158e 36 // high and low alarm bytes, need to read these registers first
redplam 4:5213bee8158e 37 // and copy them back on the write
redplam 4:5213bee8158e 38
redplam 4:5213bee8158e 39 BYTE read_data[THERMOM_SCRATCHPAD_SIZE];
redplam 4:5213bee8158e 40 BYTE write_data[ALARM_CONFIG_SIZE];
redplam 4:5213bee8158e 41
redplam 4:5213bee8158e 42 if (readAndValidateData(read_data))
redplam 4:5213bee8158e 43 {
redplam 4:5213bee8158e 44 // copy alarm and config data to write data
redplam 4:5213bee8158e 45 for (int k = 2; k < 5; k++)
redplam 4:5213bee8158e 46 {
redplam 4:5213bee8158e 47 write_data[k - 2] = read_data[k];
redplam 4:5213bee8158e 48 }
redplam 4:5213bee8158e 49 int config = write_data[2];
redplam 4:5213bee8158e 50 config &= 0x9F;
redplam 4:5213bee8158e 51 config ^= (resln << 5);
redplam 4:5213bee8158e 52 write_data[2] = config;
redplam 4:5213bee8158e 53
redplam 4:5213bee8158e 54 resetAndAddress();
redplam 4:5213bee8158e 55 oneWire.writeByte(WRITESCRATCH);
redplam 4:5213bee8158e 56 for (int k = 0; k < 3; k++)
redplam 4:5213bee8158e 57 {
redplam 4:5213bee8158e 58 oneWire.writeByte(write_data[k]);
redplam 4:5213bee8158e 59 }
redplam 4:5213bee8158e 60
redplam 4:5213bee8158e 61 // remember it so we can use the correct delay in reading the temperature
redplam 4:5213bee8158e 62 // for parasitic power
redplam 4:5213bee8158e 63 resolution = resln;
redplam 4:5213bee8158e 64 }
redplam 4:5213bee8158e 65 }
redplam 4:5213bee8158e 66
redplam 4:5213bee8158e 67 float DS18B20::calculateTemperature(BYTE* data)
redplam 4:5213bee8158e 68 {
redplam 4:5213bee8158e 69 bool signBit = false;
redplam 4:5213bee8158e 70 if (data[TEMPERATURE_MSB] & 0x80) signBit = true;
redplam 4:5213bee8158e 71
redplam 4:5213bee8158e 72 int read_temp = (data[TEMPERATURE_MSB] << 8) + data[TEMPERATURE_LSB];
redplam 4:5213bee8158e 73 if (signBit)
redplam 4:5213bee8158e 74 {
redplam 4:5213bee8158e 75 read_temp = (read_temp ^ 0xFFFF) + 1; // two's complement
redplam 4:5213bee8158e 76 read_temp *= -1;
redplam 4:5213bee8158e 77 }
redplam 4:5213bee8158e 78
redplam 4:5213bee8158e 79 int resolution = (data[CONFIG_REG_BYTE] & 0x60) >> 5; // mask off bits 6,5 and move to 1,0
redplam 4:5213bee8158e 80 switch (resolution)
redplam 4:5213bee8158e 81 {
redplam 4:5213bee8158e 82 case nineBit: // 0.5 deg C increments
redplam 4:5213bee8158e 83 read_temp &= 0xFFF8; // bits 2,1,0 are undefined
redplam 4:5213bee8158e 84 //pc_ds18B20.traceOut("9 bit resolution ...\r\n");
redplam 4:5213bee8158e 85 break;
redplam 4:5213bee8158e 86 case tenBit: // 0.25 deg C increments
redplam 4:5213bee8158e 87 read_temp &= 0xFFFC; // bits 1,0 are undefined
redplam 4:5213bee8158e 88 //pc_ds18B20.traceOut("10 bit resolution ...\r\n");
redplam 4:5213bee8158e 89 break;
redplam 4:5213bee8158e 90 case elevenBit: // 0.125 deg C increments
redplam 4:5213bee8158e 91 read_temp &= 0xFFFE; // bit 0 is undefined
redplam 4:5213bee8158e 92 //pc_ds18B20.traceOut("11 bit resolution ...\r\n");
redplam 4:5213bee8158e 93 break;
redplam 4:5213bee8158e 94 case twelveBit: // 0.0625 deg C increments
redplam 4:5213bee8158e 95 //pc_ds18B20.traceOut("12 bit resolution ...\r\n");
redplam 4:5213bee8158e 96 break;
redplam 4:5213bee8158e 97 }
redplam 4:5213bee8158e 98 float realTemp = (float)read_temp/16 ;
redplam 4:5213bee8158e 99
redplam 4:5213bee8158e 100 //pc_ds18B20.traceOut("TEMP_READ/REAL TEMP: %f \r\n", realTemp);
redplam 4:5213bee8158e 101
redplam 4:5213bee8158e 102 return realTemp;
redplam 4:5213bee8158e 103 }