Toyomasa Watarai / HDC1080

HDC1080 sensor library

HDC1080.cpp@2:b913d2690215, 2019-11-08 (annotated)

Committer:
MACRUM
Date:
Fri Nov 08 05:08:12 2019 +0000
Revision:
2:b913d2690215
Parent:
1:a0e46d956969
Child:
3:d7627c8dcfe3
Add thread_sleep_for calls

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 2:b913d2690215 64 thread_sleep_for(15);
MACRUM 1:a0e46d956969 65 memset(_buffer,0,4);
MACRUM 1:a0e46d956969 66 _buffer[0] = HDC_MANID_OFF;
shivanandgowdakr 0:fdb750cc9ca8 67
MACRUM 1:a0e46d956969 68 int res = this->write(CHIP_ADDRESS, _buffer, 1);
shivanandgowdakr 0:fdb750cc9ca8 69 if (res != 0) {
MACRUM 1:a0e46d956969 70 return (unsigned long) HDC_CHIP_SER_ERROR;
shivanandgowdakr 0:fdb750cc9ca8 71 }
MACRUM 1:a0e46d956969 72
MACRUM 2:b913d2690215 73 thread_sleep_for(15);
MACRUM 1:a0e46d956969 74 memset(_buffer,0,4);
MACRUM 1:a0e46d956969 75
MACRUM 1:a0e46d956969 76 res = this->read(CHIP_ADDRESS, _buffer,4);
MACRUM 1:a0e46d956969 77 if (res != 0) {
MACRUM 1:a0e46d956969 78 return (unsigned long) HDC_CHIP_SER_ERROR;
MACRUM 1:a0e46d956969 79 }
MACRUM 1:a0e46d956969 80
MACRUM 1:a0e46d956969 81 unsigned long rawser = _buffer[2] << 16 | _buffer[1] << 8 | _buffer[0];
shivanandgowdakr 0:fdb750cc9ca8 82 return rawser;
shivanandgowdakr 0:fdb750cc9ca8 83 }
MACRUM 1:a0e46d956969 84
MACRUM 1:a0e46d956969 85 //Private Member functions
MACRUM 1:a0e46d956969 86
MACRUM 1:a0e46d956969 87 uint16_t HDC1080::read2Bytes(int chip_addr, int offset)
shivanandgowdakr 0:fdb750cc9ca8 88 {
MACRUM 1:a0e46d956969 89 memset(_buffer,0,3);
MACRUM 1:a0e46d956969 90
shivanandgowdakr 0:fdb750cc9ca8 91 // send chip address onto buss
MACRUM 1:a0e46d956969 92 _buffer[0] = offset;
MACRUM 1:a0e46d956969 93 int res =this->write(chip_addr, _buffer, 1);
shivanandgowdakr 0:fdb750cc9ca8 94 if (res != 0) {
shivanandgowdakr 0:fdb750cc9ca8 95 return 0;
shivanandgowdakr 0:fdb750cc9ca8 96 }
MACRUM 1:a0e46d956969 97
shivanandgowdakr 0:fdb750cc9ca8 98 // read data from chip
MACRUM 2:b913d2690215 99 thread_sleep_for(15);
MACRUM 1:a0e46d956969 100 memset(_buffer,0,3);
MACRUM 1:a0e46d956969 101 res = this->read(CHIP_ADDRESS, _buffer,2);
shivanandgowdakr 0:fdb750cc9ca8 102 if (res != 0) {
shivanandgowdakr 0:fdb750cc9ca8 103 return 0;
shivanandgowdakr 0:fdb750cc9ca8 104 }
MACRUM 1:a0e46d956969 105 return _buffer[0] << 8 | _buffer[1];
shivanandgowdakr 0:fdb750cc9ca8 106 }