Motoo Tanaka / MAX30205

MAX30205 Human Body Temperature Sensor

Dependents:   test_MAX30205

MAX30205.cpp@1:eed7f4c33402, 2017-04-25 (annotated)

Committer:
Rhyme
Date:
Tue Apr 25 05:12:24 2017 +0000
Revision:
1:eed7f4c33402
Parent:
0:6cf99fa71e1b 
format comment added

Who changed what in which revision?

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Rhyme 0:6cf99fa71e1b 1 #include "mbed.h"
Rhyme 0:6cf99fa71e1b 2 #include "MAX30205.h"
Rhyme 0:6cf99fa71e1b 3
Rhyme 0:6cf99fa71e1b 4 /**
Rhyme 0:6cf99fa71e1b 5 * Internal Registers
Rhyme 0:6cf99fa71e1b 6 * The device contains four registers,
Rhyme 0:6cf99fa71e1b 7 * each of which consists of 2bytes.
Rhyme 0:6cf99fa71e1b 8 * The configuration register contains only 1 byte of
Rhyme 0:6cf99fa71e1b 9 * actual data and, when read as a 2-byte register,
Rhyme 0:6cf99fa71e1b 10 * repeats the same data for the second byte.
Rhyme 0:6cf99fa71e1b 11 */
Rhyme 0:6cf99fa71e1b 12
Rhyme 0:6cf99fa71e1b 13 #define REG_TEMP 0x00
Rhyme 0:6cf99fa71e1b 14 #define REG_CONF 0x01
Rhyme 0:6cf99fa71e1b 15 #define REG_THYST 0x02
Rhyme 0:6cf99fa71e1b 16 #define REG_TOS 0x03
Rhyme 0:6cf99fa71e1b 17
Rhyme 0:6cf99fa71e1b 18 MAX30205::MAX30205(PinName sda, PinName scl, int addr): m_i2c(sda, scl), m_addr(addr<<1)
Rhyme 0:6cf99fa71e1b 19 {
Rhyme 0:6cf99fa71e1b 20 // activate the peripheral
Rhyme 0:6cf99fa71e1b 21 }
Rhyme 0:6cf99fa71e1b 22
Rhyme 0:6cf99fa71e1b 23 MAX30205::~MAX30205()
Rhyme 0:6cf99fa71e1b 24 {
Rhyme 0:6cf99fa71e1b 25 }
Rhyme 0:6cf99fa71e1b 26
Rhyme 0:6cf99fa71e1b 27 uint16_t MAX30205::getTemp(void)
Rhyme 0:6cf99fa71e1b 28 {
Rhyme 0:6cf99fa71e1b 29 uint16_t temp ;
Rhyme 0:6cf99fa71e1b 30 uint8_t data[2] ;
Rhyme 0:6cf99fa71e1b 31 readRegs(REG_TEMP, data, 2) ;
Rhyme 0:6cf99fa71e1b 32 temp = (data[0] << 8) | data[1] ;
Rhyme 0:6cf99fa71e1b 33 return(temp) ;
Rhyme 0:6cf99fa71e1b 34 }
Rhyme 0:6cf99fa71e1b 35
Rhyme 0:6cf99fa71e1b 36 uint8_t MAX30205::getConf(void)
Rhyme 0:6cf99fa71e1b 37 {
Rhyme 0:6cf99fa71e1b 38 uint8_t data[2] ;
Rhyme 0:6cf99fa71e1b 39 readRegs(REG_CONF, data, 2) ;
Rhyme 0:6cf99fa71e1b 40 return(data[0]) ;
Rhyme 0:6cf99fa71e1b 41 }
Rhyme 0:6cf99fa71e1b 42
Rhyme 0:6cf99fa71e1b 43 void MAX30205::setConf(uint8_t conf)
Rhyme 0:6cf99fa71e1b 44 {
Rhyme 0:6cf99fa71e1b 45 uint8_t data[3] ;
Rhyme 0:6cf99fa71e1b 46 data[0] = REG_CONF ;
Rhyme 0:6cf99fa71e1b 47 data[1] = conf ;
Rhyme 0:6cf99fa71e1b 48 data[2] = conf ;
Rhyme 0:6cf99fa71e1b 49 writeRegs(data, 3) ;
Rhyme 0:6cf99fa71e1b 50 }
Rhyme 0:6cf99fa71e1b 51
Rhyme 0:6cf99fa71e1b 52 uint16_t MAX30205::getThyst(void)
Rhyme 0:6cf99fa71e1b 53 {
Rhyme 0:6cf99fa71e1b 54 uint16_t thyst ;
Rhyme 0:6cf99fa71e1b 55 uint8_t data[2] ;
Rhyme 0:6cf99fa71e1b 56 readRegs(REG_THYST, data, 2) ;
Rhyme 0:6cf99fa71e1b 57 thyst = (data[0] << 8) | data[1] ;
Rhyme 0:6cf99fa71e1b 58 return(thyst) ;
Rhyme 0:6cf99fa71e1b 59 }
Rhyme 0:6cf99fa71e1b 60
Rhyme 0:6cf99fa71e1b 61 void MAX30205::setThyst(uint16_t thyst)
Rhyme 0:6cf99fa71e1b 62 {
Rhyme 0:6cf99fa71e1b 63 uint8_t data[3] ;
Rhyme 0:6cf99fa71e1b 64 data[0] = REG_THYST ;
Rhyme 0:6cf99fa71e1b 65 data[1] = (thyst >> 8) & 0xFF ;
Rhyme 0:6cf99fa71e1b 66 data[2] = thyst & 0xFF ;
Rhyme 0:6cf99fa71e1b 67 writeRegs(data, 3) ;
Rhyme 0:6cf99fa71e1b 68 }
Rhyme 0:6cf99fa71e1b 69
Rhyme 0:6cf99fa71e1b 70 uint16_t MAX30205::getTos(void)
Rhyme 0:6cf99fa71e1b 71 {
Rhyme 0:6cf99fa71e1b 72 uint16_t tos ;
Rhyme 0:6cf99fa71e1b 73 uint8_t data[2] ;
Rhyme 0:6cf99fa71e1b 74 readRegs(REG_TOS, data, 2) ;
Rhyme 0:6cf99fa71e1b 75 tos = (data[0] << 8) | data[1] ;
Rhyme 0:6cf99fa71e1b 76 return(tos) ;
Rhyme 0:6cf99fa71e1b 77 }
Rhyme 0:6cf99fa71e1b 78
Rhyme 0:6cf99fa71e1b 79 void MAX30205::setTos(uint16_t tos)
Rhyme 0:6cf99fa71e1b 80 {
Rhyme 0:6cf99fa71e1b 81 uint8_t data[3] ;
Rhyme 0:6cf99fa71e1b 82 data[0] = REG_TOS ;
Rhyme 0:6cf99fa71e1b 83 data[1] = (tos >> 8) & 0xFF ;
Rhyme 0:6cf99fa71e1b 84 data[2] = tos & 0xFF ;
Rhyme 0:6cf99fa71e1b 85 writeRegs(data, 3) ;
Rhyme 0:6cf99fa71e1b 86 }
Rhyme 0:6cf99fa71e1b 87
Rhyme 0:6cf99fa71e1b 88 void MAX30205::readRegs(int addr, uint8_t * data, int len) {
Rhyme 0:6cf99fa71e1b 89 char t[1] = {addr};
Rhyme 0:6cf99fa71e1b 90 m_i2c.write(m_addr, t, 1, true);
Rhyme 0:6cf99fa71e1b 91 m_i2c.read(m_addr, (char *)data, len);
Rhyme 0:6cf99fa71e1b 92 }
Rhyme 0:6cf99fa71e1b 93
Rhyme 0:6cf99fa71e1b 94 void MAX30205::writeRegs(uint8_t * data, int len) {
Rhyme 0:6cf99fa71e1b 95 m_i2c.write(m_addr, (char *)data, len);
Rhyme 0:6cf99fa71e1b 96 }