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?
User | Revision | Line number | New contents of line |
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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, ®ister_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, ®ister_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, ®ister_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 |