Toyomasa Watarai / HDC1080

HDC1080 sensor library

HDC1080.cpp@1:a0e46d956969, 2019-11-08 (annotated)

Committer:
MACRUM
Date:
Fri Nov 08 04:56:00 2019 +0000
Revision:
1:a0e46d956969
Parent:
0:fdb750cc9ca8
Child:
2:b913d2690215
Remove printf

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shivanandgowdakr 0:fdb750cc9ca8 1
shivanandgowdakr 0:fdb750cc9ca8 2 #include "mbed.h"
shivanandgowdakr 0:fdb750cc9ca8 3 #include "HDC1080.h"
shivanandgowdakr 0:fdb750cc9ca8 4
shivanandgowdakr 0:fdb750cc9ca8 5 #define HDC_TEMP_OFF 0x00
shivanandgowdakr 0:fdb750cc9ca8 6 #define HDC_HUMID_OFF 0x01
shivanandgowdakr 0:fdb750cc9ca8 7 #define HDC_CONFIG_OFF 0x02
shivanandgowdakr 0:fdb750cc9ca8 8 #define HDC_MANID_OFF 0xFE
shivanandgowdakr 0:fdb750cc9ca8 9 #define HDC_SER_OFF_FIRST 0xFB
shivanandgowdakr 0:fdb750cc9ca8 10 #define HDC_SER_OFF_MID 0xFC
shivanandgowdakr 0:fdb750cc9ca8 11 #define HDC_SER_OFF_LAST 0xFD
shivanandgowdakr 0:fdb750cc9ca8 12 #define I2C_FREQ 100000
MACRUM 1:a0e46d956969 13 #define CHIP_ADDRESS (0x40 << 1)
shivanandgowdakr 0:fdb750cc9ca8 14
shivanandgowdakr 0:fdb750cc9ca8 15 const float HDC_CHIP_ERROR = -255;
shivanandgowdakr 0:fdb750cc9ca8 16 const unsigned long HDC_CHIP_SER_ERROR = 0;
shivanandgowdakr 0:fdb750cc9ca8 17
shivanandgowdakr 0:fdb750cc9ca8 18
MACRUM 1:a0e46d956969 19 HDC1080::HDC1080(PinName sda, PinName slc) : I2C(sda, slc)
shivanandgowdakr 0:fdb750cc9ca8 20 {
MACRUM 1:a0e46d956969 21 memset(_buffer,'\0',5);
MACRUM 1:a0e46d956969 22 _buffer[0] = HDC_CONFIG_OFF;
shivanandgowdakr 0:fdb750cc9ca8 23 this->frequency(I2C_FREQ);
MACRUM 1:a0e46d956969 24 int res = this->write(CHIP_ADDRESS, _buffer, 2);
shivanandgowdakr 0:fdb750cc9ca8 25 }
shivanandgowdakr 0:fdb750cc9ca8 26
MACRUM 1:a0e46d956969 27 int HDC1080::ReadSignature(void)
MACRUM 1:a0e46d956969 28 {
MACRUM 1:a0e46d956969 29 uint16_t Manufacturer_ID = read2Bytes(CHIP_ADDRESS, HDC_MANID_OFF);
MACRUM 1:a0e46d956969 30
shivanandgowdakr 0:fdb750cc9ca8 31 if (Manufacturer_ID == 0) {
MACRUM 1:a0e46d956969 32 return (int)HDC_CHIP_ERROR;
MACRUM 1:a0e46d956969 33 } else {
shivanandgowdakr 0:fdb750cc9ca8 34 return Manufacturer_ID;
MACRUM 1:a0e46d956969 35 }
MACRUM 1:a0e46d956969 36 }
MACRUM 1:a0e46d956969 37
MACRUM 1:a0e46d956969 38 float HDC1080::readTemperature()
shivanandgowdakr 0:fdb750cc9ca8 39 {
shivanandgowdakr 0:fdb750cc9ca8 40 uint16_t rawT = read2Bytes(CHIP_ADDRESS, HDC_TEMP_OFF);
MACRUM 1:a0e46d956969 41
shivanandgowdakr 0:fdb750cc9ca8 42 if (rawT == 0) {
shivanandgowdakr 0:fdb750cc9ca8 43 return HDC_CHIP_ERROR;
shivanandgowdakr 0:fdb750cc9ca8 44 } else {
shivanandgowdakr 0:fdb750cc9ca8 45 float temp = ((float) rawT / pow(2.0f, 16.0f)) * 165.0f - 40.0f;
shivanandgowdakr 0:fdb750cc9ca8 46 return temp;
shivanandgowdakr 0:fdb750cc9ca8 47 }
MACRUM 1:a0e46d956969 48 }
MACRUM 1:a0e46d956969 49
MACRUM 1:a0e46d956969 50 float HDC1080::readHumidity()
shivanandgowdakr 0:fdb750cc9ca8 51 {
shivanandgowdakr 0:fdb750cc9ca8 52 uint16_t rawH = read2Bytes(CHIP_ADDRESS, HDC_HUMID_OFF);
MACRUM 1:a0e46d956969 53
shivanandgowdakr 0:fdb750cc9ca8 54 if (rawH == 0) {
shivanandgowdakr 0:fdb750cc9ca8 55 return HDC_CHIP_ERROR;
shivanandgowdakr 0:fdb750cc9ca8 56 } else {
shivanandgowdakr 0:fdb750cc9ca8 57 float humidity = ((float) rawH / pow(2.0f, 16.0f)) * 100.0f;
shivanandgowdakr 0:fdb750cc9ca8 58 return humidity;
shivanandgowdakr 0:fdb750cc9ca8 59 }
MACRUM 1:a0e46d956969 60 }
MACRUM 1:a0e46d956969 61
MACRUM 1:a0e46d956969 62 unsigned long HDC1080::readSerialNumber(void)
MACRUM 1:a0e46d956969 63 {
MACRUM 1:a0e46d956969 64 memset(_buffer,0,4);
MACRUM 1:a0e46d956969 65 _buffer[0] = HDC_MANID_OFF;
shivanandgowdakr 0:fdb750cc9ca8 66
MACRUM 1:a0e46d956969 67 int res = this->write(CHIP_ADDRESS, _buffer, 1);
shivanandgowdakr 0:fdb750cc9ca8 68 if (res != 0) {
MACRUM 1:a0e46d956969 69 return (unsigned long) HDC_CHIP_SER_ERROR;
shivanandgowdakr 0:fdb750cc9ca8 70 }
MACRUM 1:a0e46d956969 71
MACRUM 1:a0e46d956969 72 memset(_buffer,0,4);
MACRUM 1:a0e46d956969 73
MACRUM 1:a0e46d956969 74 res = this->read(CHIP_ADDRESS, _buffer,4);
MACRUM 1:a0e46d956969 75 if (res != 0) {
MACRUM 1:a0e46d956969 76 return (unsigned long) HDC_CHIP_SER_ERROR;
MACRUM 1:a0e46d956969 77 }
MACRUM 1:a0e46d956969 78
MACRUM 1:a0e46d956969 79 unsigned long rawser = _buffer[2] << 16 | _buffer[1] << 8 | _buffer[0];
shivanandgowdakr 0:fdb750cc9ca8 80 return rawser;
shivanandgowdakr 0:fdb750cc9ca8 81 }
MACRUM 1:a0e46d956969 82
MACRUM 1:a0e46d956969 83 //Private Member functions
MACRUM 1:a0e46d956969 84
MACRUM 1:a0e46d956969 85 uint16_t HDC1080::read2Bytes(int chip_addr, int offset)
shivanandgowdakr 0:fdb750cc9ca8 86 {
MACRUM 1:a0e46d956969 87 memset(_buffer,0,3);
MACRUM 1:a0e46d956969 88
shivanandgowdakr 0:fdb750cc9ca8 89 // send chip address onto buss
MACRUM 1:a0e46d956969 90 _buffer[0] = offset;
MACRUM 1:a0e46d956969 91 int res =this->write(chip_addr, _buffer, 1);
shivanandgowdakr 0:fdb750cc9ca8 92 if (res != 0) {
shivanandgowdakr 0:fdb750cc9ca8 93 return 0;
shivanandgowdakr 0:fdb750cc9ca8 94 }
MACRUM 1:a0e46d956969 95
shivanandgowdakr 0:fdb750cc9ca8 96 // read data from chip
MACRUM 1:a0e46d956969 97 memset(_buffer,0,3);
MACRUM 1:a0e46d956969 98 res = this->read(CHIP_ADDRESS, _buffer,2);
shivanandgowdakr 0:fdb750cc9ca8 99 if (res != 0) {
shivanandgowdakr 0:fdb750cc9ca8 100 return 0;
shivanandgowdakr 0:fdb750cc9ca8 101 }
MACRUM 1:a0e46d956969 102 return _buffer[0] << 8 | _buffer[1];
shivanandgowdakr 0:fdb750cc9ca8 103 }