Edoardo De Marchi / LM75A

Library for the LM75A Temperature Sensor

Dependents:   LM75A_Test_Code MQTT_and_Temperature_Sensore_LM75 2021_Temp_y_Acelerom_V4enlace_serial

LM75A.cpp@1:19dc98c810a5, 2014-08-15 (annotated)

Committer:
edodm85
Date:
Fri Aug 15 11:56:39 2014 +0000
Revision:
1:19dc98c810a5
Parent:
0:94c821cb7f80 
Fixed temp register

Who changed what in which revision?

UserRevisionLine numberNew contents of line
edodm85 0:94c821cb7f80 1 /* Author: Edoardo De Marchi */
edodm85 0:94c821cb7f80 2 /* Copyright (C) 2012 mbed.org, MIT License
edodm85 0:94c821cb7f80 3 *
edodm85 0:94c821cb7f80 4 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
edodm85 0:94c821cb7f80 5 * and associated documentation files (the "Software"), to deal in the Software without restriction,
edodm85 0:94c821cb7f80 6 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
edodm85 0:94c821cb7f80 7 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
edodm85 0:94c821cb7f80 8 * furnished to do so, subject to the following conditions:
edodm85 0:94c821cb7f80 9 *
edodm85 0:94c821cb7f80 10 * The above copyright notice and this permission notice shall be included in all copies or
edodm85 0:94c821cb7f80 11 * substantial portions of the Software.
edodm85 0:94c821cb7f80 12 *
edodm85 0:94c821cb7f80 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
edodm85 0:94c821cb7f80 14 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
edodm85 0:94c821cb7f80 15 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
edodm85 0:94c821cb7f80 16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
edodm85 0:94c821cb7f80 17 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
edodm85 0:94c821cb7f80 18 */
edodm85 0:94c821cb7f80 19
edodm85 0:94c821cb7f80 20
edodm85 0:94c821cb7f80 21
edodm85 0:94c821cb7f80 22
edodm85 0:94c821cb7f80 23 #include "LM75A.h"
edodm85 0:94c821cb7f80 24
edodm85 0:94c821cb7f80 25
edodm85 0:94c821cb7f80 26
edodm85 0:94c821cb7f80 27 LM75A::LM75A(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr)
edodm85 0:94c821cb7f80 28 {
edodm85 1:19dc98c810a5 29 reg_addr = TEMP_REG_ADDR;
edodm85 0:94c821cb7f80 30 }
edodm85 0:94c821cb7f80 31
edodm85 0:94c821cb7f80 32
edodm85 0:94c821cb7f80 33 LM75A::~LM75A()
edodm85 0:94c821cb7f80 34 {
edodm85 0:94c821cb7f80 35
edodm85 0:94c821cb7f80 36 }
edodm85 0:94c821cb7f80 37
edodm85 0:94c821cb7f80 38
edodm85 0:94c821cb7f80 39
edodm85 0:94c821cb7f80 40 float LM75A::read_T()
edodm85 0:94c821cb7f80 41 {
edodm85 0:94c821cb7f80 42
edodm85 1:19dc98c810a5 43 m_i2c.write(m_addr, &reg_addr, 1); // Pointer to the temperature register
edodm85 0:94c821cb7f80 44 char cmd[2] = {0,0};
edodm85 0:94c821cb7f80 45 m_i2c.read(m_addr, cmd, 2); // read temperature register
edodm85 0:94c821cb7f80 46
edodm85 0:94c821cb7f80 47 unsigned short val = ((cmd[0] << 8) + cmd[1]) >> 7; //val = (cmd[ 1 ] << 1) | ( cmd[ 0 ] >> 7 ) ;
edodm85 0:94c821cb7f80 48
edodm85 0:94c821cb7f80 49 float temp = (float) ((float)val * 0.5);
edodm85 0:94c821cb7f80 50
edodm85 0:94c821cb7f80 51 return temp;
edodm85 0:94c821cb7f80 52 }
edodm85 0:94c821cb7f80 53
edodm85 0:94c821cb7f80 54
edodm85 0:94c821cb7f80 55
edodm85 0:94c821cb7f80 56 char LM75A::read_reg(char addr)
edodm85 0:94c821cb7f80 57 {
edodm85 0:94c821cb7f80 58
edodm85 0:94c821cb7f80 59 char data[1] = {0};
edodm85 0:94c821cb7f80 60 char tmp = addr;
edodm85 0:94c821cb7f80 61 m_i2c.write(m_addr, &tmp, 1);
edodm85 0:94c821cb7f80 62 m_i2c.read(m_addr, data, 1); // Read register content
edodm85 0:94c821cb7f80 63
edodm85 0:94c821cb7f80 64 return data[0];
edodm85 0:94c821cb7f80 65
edodm85 0:94c821cb7f80 66 }
edodm85 0:94c821cb7f80 67
edodm85 0:94c821cb7f80 68
edodm85 0:94c821cb7f80 69
edodm85 0:94c821cb7f80 70 void LM75A::write_reg(char addr, char data)
edodm85 0:94c821cb7f80 71 {
edodm85 0:94c821cb7f80 72
edodm85 0:94c821cb7f80 73 char data2[2] = {0, 0};
edodm85 0:94c821cb7f80 74
edodm85 0:94c821cb7f80 75 data2[0] = addr;
edodm85 0:94c821cb7f80 76 data2[1] = data;
edodm85 0:94c821cb7f80 77
edodm85 0:94c821cb7f80 78 m_i2c.write(m_addr, data2, 2);
edodm85 0:94c821cb7f80 79
edodm85 0:94c821cb7f80 80 }
edodm85 0:94c821cb7f80 81