Library for the LM75A Temperature Sensor
Dependents: LM75A_Test_Code MQTT_and_Temperature_Sensore_LM75 2021_Temp_y_Acelerom_V4enlace_serial
Diff: LM75A.cpp
- Revision:
- 0:94c821cb7f80
- Child:
- 1:19dc98c810a5
diff -r 000000000000 -r 94c821cb7f80 LM75A.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/LM75A.cpp Wed Jun 27 21:20:27 2012 +0000 @@ -0,0 +1,81 @@ +/* Author: Edoardo De Marchi */ +/* Copyright (C) 2012 mbed.org, MIT License + * + * Permission is hereby granted, free of charge, to any person obtaining a copy of this software + * and associated documentation files (the "Software"), to deal in the Software without restriction, + * including without limitation the rights to use, copy, modify, merge, publish, distribute, + * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all copies or + * substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING + * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + + + + +#include "LM75A.h" + + + +LM75A::LM75A(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) +{ + +} + + +LM75A::~LM75A() +{ + +} + + + +float LM75A::read_T() +{ + + m_i2c.write(m_addr, TEMP_REG_ADDR, 1); // Pointer to the temperature register + char cmd[2] = {0,0}; + m_i2c.read(m_addr, cmd, 2); // read temperature register + + unsigned short val = ((cmd[0] << 8) + cmd[1]) >> 7; //val = (cmd[ 1 ] << 1) | ( cmd[ 0 ] >> 7 ) ; + + float temp = (float) ((float)val * 0.5); + + return temp; +} + + + +char LM75A::read_reg(char addr) +{ + + char data[1] = {0}; + char tmp = addr; + m_i2c.write(m_addr, &tmp, 1); + m_i2c.read(m_addr, data, 1); // Read register content + + return data[0]; + +} + + + +void LM75A::write_reg(char addr, char data) +{ + + char data2[2] = {0, 0}; + + data2[0] = addr; + data2[1] = data; + + m_i2c.write(m_addr, data2, 2); + +} +