Hiroyuki Izumi / Mbed 2 deprecated ThermometerTestProgram

Thermometer indicating temperature and humidity by LED blink pattern

Dependencies:   BLE_API mbed nRF51822

hts221.cpp@0:8d05f1ced202, 2016-06-17 (annotated)

Committer:
HiroyukiIzumi
Date:
Fri Jun 17 01:55:11 2016 +0000
Revision:
0:8d05f1ced202
Thermometer indicating temperature and humidity by LED blink pattern

Who changed what in which revision?

UserRevisionLine numberNew contents of line
HiroyukiIzumi 0:8d05f1ced202 1 /* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.
HiroyukiIzumi 0:8d05f1ced202 2 *
HiroyukiIzumi 0:8d05f1ced202 3 * The information contained herein is property of Nordic Semiconductor ASA.
HiroyukiIzumi 0:8d05f1ced202 4 * Terms and conditions of usage are described in detail in NORDIC
HiroyukiIzumi 0:8d05f1ced202 5 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
HiroyukiIzumi 0:8d05f1ced202 6 *
HiroyukiIzumi 0:8d05f1ced202 7 * Licensees are granted free, non-transferable use of the information. NO
HiroyukiIzumi 0:8d05f1ced202 8 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
HiroyukiIzumi 0:8d05f1ced202 9 * the file.
HiroyukiIzumi 0:8d05f1ced202 10 *df
HiroyukiIzumi 0:8d05f1ced202 11 */
HiroyukiIzumi 0:8d05f1ced202 12
HiroyukiIzumi 0:8d05f1ced202 13 #include <stdbool.h>
HiroyukiIzumi 0:8d05f1ced202 14 #include <stdint.h>
HiroyukiIzumi 0:8d05f1ced202 15
HiroyukiIzumi 0:8d05f1ced202 16 #include <mbed.h>
HiroyukiIzumi 0:8d05f1ced202 17 #include "hts221.h"
HiroyukiIzumi 0:8d05f1ced202 18
HiroyukiIzumi 0:8d05f1ced202 19 I2C i2c(p22, p20); //SDA, SCL
HiroyukiIzumi 0:8d05f1ced202 20
HiroyukiIzumi 0:8d05f1ced202 21 /*lint ++flb "Enter library region" */
HiroyukiIzumi 0:8d05f1ced202 22
HiroyukiIzumi 0:8d05f1ced202 23 static const char expected_who_am_i = 0xBCU; //!< Expected value to get from WHO_AM_I register.
HiroyukiIzumi 0:8d05f1ced202 24
HiroyukiIzumi 0:8d05f1ced202 25 uint8_t H0_rH_x2;
HiroyukiIzumi 0:8d05f1ced202 26 uint8_t H1_rH_x2;
HiroyukiIzumi 0:8d05f1ced202 27 uint16_t T0_degC_x8;
HiroyukiIzumi 0:8d05f1ced202 28 uint16_t T1_degC_x8;
HiroyukiIzumi 0:8d05f1ced202 29
HiroyukiIzumi 0:8d05f1ced202 30 int16_t H0_T0_OUT;
HiroyukiIzumi 0:8d05f1ced202 31 int16_t H1_T0_OUT;
HiroyukiIzumi 0:8d05f1ced202 32 int16_t T0_OUT;
HiroyukiIzumi 0:8d05f1ced202 33 int16_t T1_OUT;
HiroyukiIzumi 0:8d05f1ced202 34
HiroyukiIzumi 0:8d05f1ced202 35 float T0_DegC_cal;
HiroyukiIzumi 0:8d05f1ced202 36 float T1_DegC_cal;
HiroyukiIzumi 0:8d05f1ced202 37 float H0_RH_cal;
HiroyukiIzumi 0:8d05f1ced202 38 float H1_RH_cal;
HiroyukiIzumi 0:8d05f1ced202 39
HiroyukiIzumi 0:8d05f1ced202 40 bool hts221_init(void)
HiroyukiIzumi 0:8d05f1ced202 41 {
HiroyukiIzumi 0:8d05f1ced202 42 bool transfer_succeeded = true;
HiroyukiIzumi 0:8d05f1ced202 43
HiroyukiIzumi 0:8d05f1ced202 44 i2c.frequency(400000);
HiroyukiIzumi 0:8d05f1ced202 45 hts221_register_write(0x10 , TRes_4 << 3 | HRes_5);
HiroyukiIzumi 0:8d05f1ced202 46 hts221_register_write(0x20 , PD_On | BDU_Off | ODR_1Hz); // Control register 1
HiroyukiIzumi 0:8d05f1ced202 47 hts221_register_write(0x21 , NoBoot | HeaterOff | No_OS); // Control register 2
HiroyukiIzumi 0:8d05f1ced202 48 hts221_register_write(0x22 , DRDY_H | PP_OD_PP | DRDY_NON); // Control register 3
HiroyukiIzumi 0:8d05f1ced202 49
HiroyukiIzumi 0:8d05f1ced202 50 // Read and verify product ID
HiroyukiIzumi 0:8d05f1ced202 51 transfer_succeeded &= hts221_verify_product_id();
HiroyukiIzumi 0:8d05f1ced202 52
HiroyukiIzumi 0:8d05f1ced202 53 return transfer_succeeded;
HiroyukiIzumi 0:8d05f1ced202 54 }
HiroyukiIzumi 0:8d05f1ced202 55
HiroyukiIzumi 0:8d05f1ced202 56 bool hts221_verify_product_id(void)
HiroyukiIzumi 0:8d05f1ced202 57 {
HiroyukiIzumi 0:8d05f1ced202 58 char who_am_i[1];
HiroyukiIzumi 0:8d05f1ced202 59 hts221_register_read(ADDRESS_WHO_AM_I, &who_am_i[0], 1);
HiroyukiIzumi 0:8d05f1ced202 60 if (who_am_i[0] != expected_who_am_i) return false;
HiroyukiIzumi 0:8d05f1ced202 61 else return true;
HiroyukiIzumi 0:8d05f1ced202 62 }
HiroyukiIzumi 0:8d05f1ced202 63
HiroyukiIzumi 0:8d05f1ced202 64 void hts221_register_write(uint8_t register_address, uint8_t value)
HiroyukiIzumi 0:8d05f1ced202 65 {
HiroyukiIzumi 0:8d05f1ced202 66 char w2_data[2];
HiroyukiIzumi 0:8d05f1ced202 67
HiroyukiIzumi 0:8d05f1ced202 68 w2_data[0] = register_address;
HiroyukiIzumi 0:8d05f1ced202 69 w2_data[1] = value;
HiroyukiIzumi 0:8d05f1ced202 70 i2c.write(HTS221_WriteADDE, w2_data, 2);
HiroyukiIzumi 0:8d05f1ced202 71
HiroyukiIzumi 0:8d05f1ced202 72 }
HiroyukiIzumi 0:8d05f1ced202 73
HiroyukiIzumi 0:8d05f1ced202 74 void hts221_register_read(char register_address, char *destination, uint8_t number_of_bytes)
HiroyukiIzumi 0:8d05f1ced202 75 {
HiroyukiIzumi 0:8d05f1ced202 76 i2c.write(HTS221_WriteADDE, &register_address, 1, 1);
HiroyukiIzumi 0:8d05f1ced202 77 i2c.read(HTS221_WriteADDE, destination, number_of_bytes); //Note by Tsungta, API may have a bug
HiroyukiIzumi 0:8d05f1ced202 78
HiroyukiIzumi 0:8d05f1ced202 79 //runaboud read function added by Tsungta
HiroyukiIzumi 0:8d05f1ced202 80 /* if (number_of_bytes == 1) {
HiroyukiIzumi 0:8d05f1ced202 81 i2c.write(HTS221_WriteADDE, &register_address, 1, 1);
HiroyukiIzumi 0:8d05f1ced202 82 i2c.write(HTS221_ReadADDE);
HiroyukiIzumi 0:8d05f1ced202 83 *destination = i2c.read(0);
HiroyukiIzumi 0:8d05f1ced202 84 i2c.stop();
HiroyukiIzumi 0:8d05f1ced202 85 } else {
HiroyukiIzumi 0:8d05f1ced202 86 register_address |= 0x80;
HiroyukiIzumi 0:8d05f1ced202 87 i2c.write(HTS221_WriteADDE, &register_address, 1, 1);
HiroyukiIzumi 0:8d05f1ced202 88 i2c.write(HTS221_ReadADDE);
HiroyukiIzumi 0:8d05f1ced202 89 while (number_of_bytes-- > 0)
HiroyukiIzumi 0:8d05f1ced202 90 *destination++ = i2c.read(0);
HiroyukiIzumi 0:8d05f1ced202 91 i2c.stop();
HiroyukiIzumi 0:8d05f1ced202 92 }*/
HiroyukiIzumi 0:8d05f1ced202 93 }
HiroyukiIzumi 0:8d05f1ced202 94
HiroyukiIzumi 0:8d05f1ced202 95 void HTS221_Calib(void)
HiroyukiIzumi 0:8d05f1ced202 96 {
HiroyukiIzumi 0:8d05f1ced202 97 char cal_data[16];
HiroyukiIzumi 0:8d05f1ced202 98
HiroyukiIzumi 0:8d05f1ced202 99 hts221_register_read(0xB0, cal_data, 16);
HiroyukiIzumi 0:8d05f1ced202 100
HiroyukiIzumi 0:8d05f1ced202 101 H0_rH_x2 = cal_data[0];
HiroyukiIzumi 0:8d05f1ced202 102 H1_rH_x2 = cal_data[1];
HiroyukiIzumi 0:8d05f1ced202 103 T0_degC_x8 = ((cal_data[5] & 0x03) << 8) + cal_data[2]; //MSB + LSB in
HiroyukiIzumi 0:8d05f1ced202 104 T1_degC_x8 = ((cal_data[5] & 0x0C) << 6) + cal_data[3]; // MSB
HiroyukiIzumi 0:8d05f1ced202 105
HiroyukiIzumi 0:8d05f1ced202 106 H0_T0_OUT = (cal_data[7] << 8) + cal_data[6];
HiroyukiIzumi 0:8d05f1ced202 107 H1_T0_OUT = (cal_data[11] << 8) + cal_data[10];
HiroyukiIzumi 0:8d05f1ced202 108 T0_OUT = (cal_data[13] << 8) + cal_data[12];
HiroyukiIzumi 0:8d05f1ced202 109 T1_OUT = (cal_data[15] << 8) + cal_data[14];
HiroyukiIzumi 0:8d05f1ced202 110
HiroyukiIzumi 0:8d05f1ced202 111 // convert negative 2's complement values to native negative value
HiroyukiIzumi 0:8d05f1ced202 112 if (H0_T0_OUT&0x8000) H0_T0_OUT = -(0x8000-(0x7fff&H0_T0_OUT));
HiroyukiIzumi 0:8d05f1ced202 113 if (H1_T0_OUT&0x8000) H1_T0_OUT = -(0x8000-(0x7fff&H1_T0_OUT)); //((~H1_T0_OUT)+1);//
HiroyukiIzumi 0:8d05f1ced202 114 if (T0_OUT&0x8000) T0_OUT = -(0x8000-(0x7fff&T0_OUT));
HiroyukiIzumi 0:8d05f1ced202 115 if (T1_OUT&0x8000) T1_OUT = -(0x8000-(0x7fff&T1_OUT));
HiroyukiIzumi 0:8d05f1ced202 116
HiroyukiIzumi 0:8d05f1ced202 117 T0_DegC_cal = (float) T0_degC_x8/8;
HiroyukiIzumi 0:8d05f1ced202 118 T1_DegC_cal = (float) T1_degC_x8/8;
HiroyukiIzumi 0:8d05f1ced202 119 H0_RH_cal = (float) H0_rH_x2/2;
HiroyukiIzumi 0:8d05f1ced202 120 H1_RH_cal = (float) H1_rH_x2/2;
HiroyukiIzumi 0:8d05f1ced202 121
HiroyukiIzumi 0:8d05f1ced202 122 }
HiroyukiIzumi 0:8d05f1ced202 123
HiroyukiIzumi 0:8d05f1ced202 124 void HTS221_ReadTempHumi( float *pTemp , float *pHumi)
HiroyukiIzumi 0:8d05f1ced202 125 {
HiroyukiIzumi 0:8d05f1ced202 126 char sensor_data[4];
HiroyukiIzumi 0:8d05f1ced202 127 int16_t H_OUT;
HiroyukiIzumi 0:8d05f1ced202 128 int16_t T_OUT;
HiroyukiIzumi 0:8d05f1ced202 129
HiroyukiIzumi 0:8d05f1ced202 130 hts221_register_read(0xA8, sensor_data, 4);
HiroyukiIzumi 0:8d05f1ced202 131
HiroyukiIzumi 0:8d05f1ced202 132 H_OUT = (sensor_data[1] << 8) + sensor_data[0];
HiroyukiIzumi 0:8d05f1ced202 133 T_OUT = (sensor_data[3] << 8) + sensor_data[2];
HiroyukiIzumi 0:8d05f1ced202 134
HiroyukiIzumi 0:8d05f1ced202 135 // convert negative 2's complement values to native negative value
HiroyukiIzumi 0:8d05f1ced202 136 if (H_OUT&0x8000) H_OUT = -(0x8000-(0x7fff&H_OUT)); //((~H_OUT)+1);;
HiroyukiIzumi 0:8d05f1ced202 137 if (T_OUT&0x8000) T_OUT = -(0x8000-(0x7fff&T_OUT));
HiroyukiIzumi 0:8d05f1ced202 138
HiroyukiIzumi 0:8d05f1ced202 139 *pTemp = linear_interpolation(T0_OUT, T0_DegC_cal, T1_OUT, T1_DegC_cal, T_OUT);
HiroyukiIzumi 0:8d05f1ced202 140 *pHumi = linear_interpolation(H0_T0_OUT, H0_RH_cal, H1_T0_OUT, H1_RH_cal, H_OUT);
HiroyukiIzumi 0:8d05f1ced202 141 // Constraint for measurement after calibration
HiroyukiIzumi 0:8d05f1ced202 142 if ((int)*pHumi>MaxHumi-1 | (int)*pHumi==-72) *pHumi = MaxHumi;
HiroyukiIzumi 0:8d05f1ced202 143 if ((int)*pHumi<MinHumi ) *pHumi = MinHumi;
HiroyukiIzumi 0:8d05f1ced202 144 if ((int)*pTemp>MaxTemp-1) *pHumi = MaxTemp;
HiroyukiIzumi 0:8d05f1ced202 145 if ((int)*pHumi<MinTemp ) *pHumi = MinTemp ;
HiroyukiIzumi 0:8d05f1ced202 146 }
HiroyukiIzumi 0:8d05f1ced202 147
HiroyukiIzumi 0:8d05f1ced202 148 float linear_interpolation(int16_t x0, float y0, int16_t x1, float y1, float mes)
HiroyukiIzumi 0:8d05f1ced202 149 {
HiroyukiIzumi 0:8d05f1ced202 150 float a = (float) ((y1 - y0) / (x1 - x0));
HiroyukiIzumi 0:8d05f1ced202 151 float b = (float) -a*x0 + y0;
HiroyukiIzumi 0:8d05f1ced202 152 float cal = (float) a * mes + b;
HiroyukiIzumi 0:8d05f1ced202 153 return cal;
HiroyukiIzumi 0:8d05f1ced202 154 }
HiroyukiIzumi 0:8d05f1ced202 155
HiroyukiIzumi 0:8d05f1ced202 156 /*lint --flb "Leave library region" */
HiroyukiIzumi 0:8d05f1ced202 157