LM75B Digital temperature sensor and thermal watchdog
Dependents: testLM75B testSensor TCPSocket_Client
LM75B.cpp
- Committer:
- Rhyme
- Date:
- 2016-07-06
- Revision:
- 1:61987c319606
- Parent:
- 0:1cf64e89f29d
File content as of revision 1:61987c319606:
#include "mbed.h" #include "LM75B.h" /* Register list */ #define PTR_CONF 0x01 #define PTR_TEMP 0x00 #define PTR_TOS 0x03 #define PTR_THYST 0x02 /* Configuration register */ /* B[7:5] : Reserved */ /* B[4:3] : OS_F_QUE[1:0] OS fault queue value */ #define CONFIG_QUE_1 0x00 #define CONFIG_QUE_2 (0x01 << 3) #define CONFIG_QUE_4 (0x10 << 3) #define CONFIG_QUE_6 (0x11 << 3) /* B[2] : OS_POL 0 = OS active LOW, 1 = OS active HIGH */ #define CONFIG_OS_POL_L 0x00 #define CONFIG_OS_POL_H (0x01 << 2) /* B[1] : OS_COMP_INT 0 = OS comparator, 1 = OS interrupt */ #define CONFIG_OS_COMP 0x00 #define CONFIG_OS_INT (0x01 << 1) /* B[0] : SHUTDOWN 0 = normal, 1 = shutdown */ #define CONFIG_NORMARL 0x00 #define CONFIG_SHUTDOWN 0x01 /* Temperature register */ /* D[15:5] = 11 bit data 0.125 * temp data */ /* D[4:0] : reserved */ /* Tos register */ /* D[15:7] = 9 bit data */ /* D[6:0] : reserved */ /* Thyst register */ /* D[15:7] = 9 ibt data */ /* D[6:0] : reserved */ LM75B::LM75B(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr<<1) { // activate the peripheral } LM75B::~LM75B() { } int8_t LM75B::temp(void) { char t[1] = { 0x00 } ; int8_t temp ; m_i2c.write(m_addr, t, 1, true) ; m_i2c.read(m_addr, t, 1) ; temp = (int8_t)t[0] ; return( temp ) ; } void LM75B::getTemp(float *temp) { char t[2] ; int16_t iTemp = 0 ; m_i2c.read(m_addr, t, 2) ; /* read MSB, LSB */ iTemp = (t[0] << 8) | t[1] ; iTemp >>= 5 ; *temp = 0.125 * iTemp ; } uint8_t LM75B::getConfig(uint8_t ptr_byte) { char config ; m_i2c.write(m_addr, (char*)(&ptr_byte), 1, true) ; m_i2c.read(m_addr, &config, 1) ; return( config ) ; } void LM75B::setConfig(uint8_t ptr_byte, uint8_t config_data) { char t[2] ; t[0] = ptr_byte ; t[1] = config_data ; m_i2c.write(m_addr, t, 2, true) ; } void LM75B::readRegs(int addr, uint8_t * data, int len) { char t[1] = {addr}; m_i2c.write(m_addr, t, 1, true); m_i2c.read(m_addr, (char *)data, len); } void LM75B::writeRegs(uint8_t * data, int len) { m_i2c.write(m_addr, (char *)data, len); }