MSS / LM75B

LM75B Digital temperature sensor and thermal watchdog

Dependents:   testLM75B testSensor TCPSocket_Client

LM75B.cpp@1:61987c319606, 2016-07-06 (annotated)

Committer:
Rhyme
Date:
Wed Jul 06 07:11:23 2016 +0000
Revision:
1:61987c319606
Parent:
0:1cf64e89f29d 
commit before publishing

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Rhyme 0:1cf64e89f29d 1 #include "mbed.h"
Rhyme 0:1cf64e89f29d 2 #include "LM75B.h"
Rhyme 0:1cf64e89f29d 3
Rhyme 0:1cf64e89f29d 4 /* Register list */
Rhyme 0:1cf64e89f29d 5 #define PTR_CONF 0x01
Rhyme 0:1cf64e89f29d 6 #define PTR_TEMP 0x00
Rhyme 0:1cf64e89f29d 7 #define PTR_TOS 0x03
Rhyme 0:1cf64e89f29d 8 #define PTR_THYST 0x02
Rhyme 0:1cf64e89f29d 9
Rhyme 0:1cf64e89f29d 10 /* Configuration register */
Rhyme 0:1cf64e89f29d 11 /* B[7:5] : Reserved */
Rhyme 0:1cf64e89f29d 12 /* B[4:3] : OS_F_QUE[1:0] OS fault queue value */
Rhyme 0:1cf64e89f29d 13 #define CONFIG_QUE_1 0x00
Rhyme 0:1cf64e89f29d 14 #define CONFIG_QUE_2 (0x01 << 3)
Rhyme 0:1cf64e89f29d 15 #define CONFIG_QUE_4 (0x10 << 3)
Rhyme 0:1cf64e89f29d 16 #define CONFIG_QUE_6 (0x11 << 3)
Rhyme 0:1cf64e89f29d 17 /* B[2] : OS_POL 0 = OS active LOW, 1 = OS active HIGH */
Rhyme 0:1cf64e89f29d 18 #define CONFIG_OS_POL_L 0x00
Rhyme 0:1cf64e89f29d 19 #define CONFIG_OS_POL_H (0x01 << 2)
Rhyme 0:1cf64e89f29d 20 /* B[1] : OS_COMP_INT 0 = OS comparator, 1 = OS interrupt */
Rhyme 0:1cf64e89f29d 21 #define CONFIG_OS_COMP 0x00
Rhyme 0:1cf64e89f29d 22 #define CONFIG_OS_INT (0x01 << 1)
Rhyme 0:1cf64e89f29d 23 /* B[0] : SHUTDOWN 0 = normal, 1 = shutdown */
Rhyme 0:1cf64e89f29d 24 #define CONFIG_NORMARL 0x00
Rhyme 0:1cf64e89f29d 25 #define CONFIG_SHUTDOWN 0x01
Rhyme 0:1cf64e89f29d 26
Rhyme 0:1cf64e89f29d 27 /* Temperature register */
Rhyme 0:1cf64e89f29d 28 /* D[15:5] = 11 bit data 0.125 * temp data */
Rhyme 0:1cf64e89f29d 29 /* D[4:0] : reserved */
Rhyme 0:1cf64e89f29d 30
Rhyme 1:61987c319606 31 /* Tos register */
Rhyme 1:61987c319606 32 /* D[15:7] = 9 bit data */
Rhyme 1:61987c319606 33 /* D[6:0] : reserved */
Rhyme 0:1cf64e89f29d 34
Rhyme 1:61987c319606 35 /* Thyst register */
Rhyme 1:61987c319606 36 /* D[15:7] = 9 ibt data */
Rhyme 1:61987c319606 37 /* D[6:0] : reserved */
Rhyme 0:1cf64e89f29d 38
Rhyme 0:1cf64e89f29d 39 LM75B::LM75B(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr<<1) {
Rhyme 0:1cf64e89f29d 40 // activate the peripheral
Rhyme 0:1cf64e89f29d 41 }
Rhyme 0:1cf64e89f29d 42
Rhyme 0:1cf64e89f29d 43 LM75B::~LM75B() { }
Rhyme 0:1cf64e89f29d 44
Rhyme 0:1cf64e89f29d 45 int8_t LM75B::temp(void)
Rhyme 0:1cf64e89f29d 46 {
Rhyme 0:1cf64e89f29d 47 char t[1] = { 0x00 } ;
Rhyme 0:1cf64e89f29d 48 int8_t temp ;
Rhyme 0:1cf64e89f29d 49 m_i2c.write(m_addr, t, 1, true) ;
Rhyme 0:1cf64e89f29d 50 m_i2c.read(m_addr, t, 1) ;
Rhyme 0:1cf64e89f29d 51 temp = (int8_t)t[0] ;
Rhyme 0:1cf64e89f29d 52 return( temp ) ;
Rhyme 0:1cf64e89f29d 53 }
Rhyme 0:1cf64e89f29d 54
Rhyme 0:1cf64e89f29d 55 void LM75B::getTemp(float *temp)
Rhyme 0:1cf64e89f29d 56 {
Rhyme 0:1cf64e89f29d 57 char t[2] ;
Rhyme 0:1cf64e89f29d 58 int16_t iTemp = 0 ;
Rhyme 0:1cf64e89f29d 59 m_i2c.read(m_addr, t, 2) ; /* read MSB, LSB */
Rhyme 0:1cf64e89f29d 60 iTemp = (t[0] << 8) | t[1] ;
Rhyme 0:1cf64e89f29d 61 iTemp >>= 5 ;
Rhyme 0:1cf64e89f29d 62 *temp = 0.125 * iTemp ;
Rhyme 0:1cf64e89f29d 63 }
Rhyme 0:1cf64e89f29d 64
Rhyme 0:1cf64e89f29d 65 uint8_t LM75B::getConfig(uint8_t ptr_byte)
Rhyme 0:1cf64e89f29d 66 {
Rhyme 0:1cf64e89f29d 67 char config ;
Rhyme 0:1cf64e89f29d 68 m_i2c.write(m_addr, (char*)(&ptr_byte), 1, true) ;
Rhyme 0:1cf64e89f29d 69 m_i2c.read(m_addr, &config, 1) ;
Rhyme 0:1cf64e89f29d 70 return( config ) ;
Rhyme 0:1cf64e89f29d 71 }
Rhyme 0:1cf64e89f29d 72
Rhyme 0:1cf64e89f29d 73 void LM75B::setConfig(uint8_t ptr_byte, uint8_t config_data)
Rhyme 0:1cf64e89f29d 74 {
Rhyme 0:1cf64e89f29d 75 char t[2] ;
Rhyme 0:1cf64e89f29d 76 t[0] = ptr_byte ;
Rhyme 0:1cf64e89f29d 77 t[1] = config_data ;
Rhyme 0:1cf64e89f29d 78 m_i2c.write(m_addr, t, 2, true) ;
Rhyme 0:1cf64e89f29d 79 }
Rhyme 0:1cf64e89f29d 80
Rhyme 0:1cf64e89f29d 81 void LM75B::readRegs(int addr, uint8_t * data, int len) {
Rhyme 0:1cf64e89f29d 82 char t[1] = {addr};
Rhyme 0:1cf64e89f29d 83 m_i2c.write(m_addr, t, 1, true);
Rhyme 0:1cf64e89f29d 84 m_i2c.read(m_addr, (char *)data, len);
Rhyme 0:1cf64e89f29d 85 }
Rhyme 0:1cf64e89f29d 86
Rhyme 0:1cf64e89f29d 87 void LM75B::writeRegs(uint8_t * data, int len) {
Rhyme 0:1cf64e89f29d 88 m_i2c.write(m_addr, (char *)data, len);
Rhyme 0:1cf64e89f29d 89 }