Delta / Mbed OS BLE_HTS_Demo

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hts221.cpp@9:2ff66a3d164a, 2017-07-18 (annotated)

Committer:
silviaChen
Date:
Tue Jul 18 09:34:06 2017 +0000
Revision:
9:2ff66a3d164a
Parent:
0:ef0f188a6fdd
Child:
10:5220f45c8ec1
update mbed-os so both NNN50 and NQ620 (as well as NQ624 module) platform are supported; Add config in mbed_app.json to fix NQ620 use internal RC issue ; remove the unused shield folder;update BLE_API;Modify SCL/SDA pin

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Marcomissyou 0:ef0f188a6fdd 1 /* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.
Marcomissyou 0:ef0f188a6fdd 2 *
Marcomissyou 0:ef0f188a6fdd 3 * The information contained herein is property of Nordic Semiconductor ASA.
Marcomissyou 0:ef0f188a6fdd 4 * Terms and conditions of usage are described in detail in NORDIC
Marcomissyou 0:ef0f188a6fdd 5 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
Marcomissyou 0:ef0f188a6fdd 6 *
Marcomissyou 0:ef0f188a6fdd 7 * Licensees are granted free, non-transferable use of the information. NO
Marcomissyou 0:ef0f188a6fdd 8 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
Marcomissyou 0:ef0f188a6fdd 9 * the file.
Marcomissyou 0:ef0f188a6fdd 10 *df
Marcomissyou 0:ef0f188a6fdd 11 */
Marcomissyou 0:ef0f188a6fdd 12
Marcomissyou 0:ef0f188a6fdd 13 #include <stdbool.h>
Marcomissyou 0:ef0f188a6fdd 14 #include <stdint.h>
Marcomissyou 0:ef0f188a6fdd 15
Marcomissyou 0:ef0f188a6fdd 16 #include <mbed.h>
Marcomissyou 0:ef0f188a6fdd 17 #include "hts221.h"
Marcomissyou 0:ef0f188a6fdd 18
silviaChen 9:2ff66a3d164a 19 I2C i2c(p26, p27); //SDA, SCL
Marcomissyou 0:ef0f188a6fdd 20
Marcomissyou 0:ef0f188a6fdd 21 /*lint ++flb "Enter library region" */
Marcomissyou 0:ef0f188a6fdd 22
Marcomissyou 0:ef0f188a6fdd 23 static const char expected_who_am_i = 0xBCU; //!< Expected value to get from WHO_AM_I register.
Marcomissyou 0:ef0f188a6fdd 24
Marcomissyou 0:ef0f188a6fdd 25 uint8_t H0_rH_x2;
Marcomissyou 0:ef0f188a6fdd 26 uint8_t H1_rH_x2;
Marcomissyou 0:ef0f188a6fdd 27 uint16_t T0_degC_x8;
Marcomissyou 0:ef0f188a6fdd 28 uint16_t T1_degC_x8;
Marcomissyou 0:ef0f188a6fdd 29
Marcomissyou 0:ef0f188a6fdd 30 int16_t H0_T0_OUT;
Marcomissyou 0:ef0f188a6fdd 31 int16_t H1_T0_OUT;
Marcomissyou 0:ef0f188a6fdd 32 int16_t T0_OUT;
Marcomissyou 0:ef0f188a6fdd 33 int16_t T1_OUT;
Marcomissyou 0:ef0f188a6fdd 34
Marcomissyou 0:ef0f188a6fdd 35 float T0_DegC_cal;
Marcomissyou 0:ef0f188a6fdd 36 float T1_DegC_cal;
Marcomissyou 0:ef0f188a6fdd 37 float H0_RH_cal;
Marcomissyou 0:ef0f188a6fdd 38 float H1_RH_cal;
Marcomissyou 0:ef0f188a6fdd 39
Marcomissyou 0:ef0f188a6fdd 40 bool hts221_init(void)
Marcomissyou 0:ef0f188a6fdd 41 {
Marcomissyou 0:ef0f188a6fdd 42 bool transfer_succeeded = true;
Marcomissyou 0:ef0f188a6fdd 43
Marcomissyou 0:ef0f188a6fdd 44 i2c.frequency(400000);
Marcomissyou 0:ef0f188a6fdd 45 hts221_register_write(0x10 , TRes_4 << 3 | HRes_5);
Marcomissyou 0:ef0f188a6fdd 46 hts221_register_write(0x20 , PD_On | BDU_Off | ODR_1Hz); // Control register 1
Marcomissyou 0:ef0f188a6fdd 47 hts221_register_write(0x21 , NoBoot | HeaterOff | No_OS); // Control register 2
Marcomissyou 0:ef0f188a6fdd 48 hts221_register_write(0x22 , DRDY_H | PP_OD_PP | DRDY_NON); // Control register 3
Marcomissyou 0:ef0f188a6fdd 49
Marcomissyou 0:ef0f188a6fdd 50 // Read and verify product ID
Marcomissyou 0:ef0f188a6fdd 51 transfer_succeeded &= hts221_verify_product_id();
Marcomissyou 0:ef0f188a6fdd 52
Marcomissyou 0:ef0f188a6fdd 53 return transfer_succeeded;
Marcomissyou 0:ef0f188a6fdd 54 }
Marcomissyou 0:ef0f188a6fdd 55
Marcomissyou 0:ef0f188a6fdd 56 bool hts221_verify_product_id(void)
Marcomissyou 0:ef0f188a6fdd 57 {
Marcomissyou 0:ef0f188a6fdd 58 char who_am_i[1];
Marcomissyou 0:ef0f188a6fdd 59 hts221_register_read(ADDRESS_WHO_AM_I, &who_am_i[0], 1);
Marcomissyou 0:ef0f188a6fdd 60 if (who_am_i[0] != expected_who_am_i) return false;
Marcomissyou 0:ef0f188a6fdd 61 else return true;
Marcomissyou 0:ef0f188a6fdd 62 }
Marcomissyou 0:ef0f188a6fdd 63
Marcomissyou 0:ef0f188a6fdd 64 void hts221_register_write(uint8_t register_address, uint8_t value)
Marcomissyou 0:ef0f188a6fdd 65 {
Marcomissyou 0:ef0f188a6fdd 66 char w2_data[2];
Marcomissyou 0:ef0f188a6fdd 67
Marcomissyou 0:ef0f188a6fdd 68 w2_data[0] = register_address;
Marcomissyou 0:ef0f188a6fdd 69 w2_data[1] = value;
Marcomissyou 0:ef0f188a6fdd 70 i2c.write(HTS221_WriteADDE, w2_data, 2);
Marcomissyou 0:ef0f188a6fdd 71
Marcomissyou 0:ef0f188a6fdd 72 }
Marcomissyou 0:ef0f188a6fdd 73
Marcomissyou 0:ef0f188a6fdd 74 void hts221_register_read(char register_address, char *destination, uint8_t number_of_bytes)
Marcomissyou 0:ef0f188a6fdd 75 {
Marcomissyou 0:ef0f188a6fdd 76 i2c.write(HTS221_WriteADDE, &register_address, 1, 1);
Marcomissyou 0:ef0f188a6fdd 77 i2c.read(HTS221_WriteADDE, destination, number_of_bytes); //Note by Tsungta, API may have a bug
Marcomissyou 0:ef0f188a6fdd 78
Marcomissyou 0:ef0f188a6fdd 79 //runaboud read function added by Tsungta
Marcomissyou 0:ef0f188a6fdd 80 /* if (number_of_bytes == 1) {
Marcomissyou 0:ef0f188a6fdd 81 i2c.write(HTS221_WriteADDE, &register_address, 1, 1);
Marcomissyou 0:ef0f188a6fdd 82 i2c.write(HTS221_ReadADDE);
Marcomissyou 0:ef0f188a6fdd 83 *destination = i2c.read(0);
Marcomissyou 0:ef0f188a6fdd 84 i2c.stop();
Marcomissyou 0:ef0f188a6fdd 85 } else {
Marcomissyou 0:ef0f188a6fdd 86 register_address |= 0x80;
Marcomissyou 0:ef0f188a6fdd 87 i2c.write(HTS221_WriteADDE, &register_address, 1, 1);
Marcomissyou 0:ef0f188a6fdd 88 i2c.write(HTS221_ReadADDE);
Marcomissyou 0:ef0f188a6fdd 89 while (number_of_bytes-- > 0)
Marcomissyou 0:ef0f188a6fdd 90 *destination++ = i2c.read(0);
Marcomissyou 0:ef0f188a6fdd 91 i2c.stop();
Marcomissyou 0:ef0f188a6fdd 92 }*/
Marcomissyou 0:ef0f188a6fdd 93 }
Marcomissyou 0:ef0f188a6fdd 94
Marcomissyou 0:ef0f188a6fdd 95 void HTS221_Calib(void)
Marcomissyou 0:ef0f188a6fdd 96 {
Marcomissyou 0:ef0f188a6fdd 97 char cal_data[16];
Marcomissyou 0:ef0f188a6fdd 98
Marcomissyou 0:ef0f188a6fdd 99 hts221_register_read(0xB0, cal_data, 16);
Marcomissyou 0:ef0f188a6fdd 100
Marcomissyou 0:ef0f188a6fdd 101 H0_rH_x2 = cal_data[0];
Marcomissyou 0:ef0f188a6fdd 102 H1_rH_x2 = cal_data[1];
Marcomissyou 0:ef0f188a6fdd 103 T0_degC_x8 = ((cal_data[5] & 0x03) << 8) + cal_data[2]; //MSB + LSB in
Marcomissyou 0:ef0f188a6fdd 104 T1_degC_x8 = ((cal_data[5] & 0x0C) << 6) + cal_data[3]; // MSB
Marcomissyou 0:ef0f188a6fdd 105
Marcomissyou 0:ef0f188a6fdd 106 H0_T0_OUT = (cal_data[7] << 8) + cal_data[6];
Marcomissyou 0:ef0f188a6fdd 107 H1_T0_OUT = (cal_data[11] << 8) + cal_data[10];
Marcomissyou 0:ef0f188a6fdd 108 T0_OUT = (cal_data[13] << 8) + cal_data[12];
Marcomissyou 0:ef0f188a6fdd 109 T1_OUT = (cal_data[15] << 8) + cal_data[14];
Marcomissyou 0:ef0f188a6fdd 110
Marcomissyou 0:ef0f188a6fdd 111 // convert negative 2's complement values to native negative value
Marcomissyou 0:ef0f188a6fdd 112 if (H0_T0_OUT&0x8000) H0_T0_OUT = -(0x8000-(0x7fff&H0_T0_OUT));
Marcomissyou 0:ef0f188a6fdd 113 if (H1_T0_OUT&0x8000) H1_T0_OUT = -(0x8000-(0x7fff&H1_T0_OUT)); //((~H1_T0_OUT)+1);//
Marcomissyou 0:ef0f188a6fdd 114 if (T0_OUT&0x8000) T0_OUT = -(0x8000-(0x7fff&T0_OUT));
Marcomissyou 0:ef0f188a6fdd 115 if (T1_OUT&0x8000) T1_OUT = -(0x8000-(0x7fff&T1_OUT));
Marcomissyou 0:ef0f188a6fdd 116
Marcomissyou 0:ef0f188a6fdd 117 T0_DegC_cal = (float) T0_degC_x8/8;
Marcomissyou 0:ef0f188a6fdd 118 T1_DegC_cal = (float) T1_degC_x8/8;
Marcomissyou 0:ef0f188a6fdd 119 H0_RH_cal = (float) H0_rH_x2/2;
Marcomissyou 0:ef0f188a6fdd 120 H1_RH_cal = (float) H1_rH_x2/2;
Marcomissyou 0:ef0f188a6fdd 121
Marcomissyou 0:ef0f188a6fdd 122 }
Marcomissyou 0:ef0f188a6fdd 123
Marcomissyou 0:ef0f188a6fdd 124 void HTS221_ReadTempHumi( float *pTemp , float *pHumi)
Marcomissyou 0:ef0f188a6fdd 125 {
Marcomissyou 0:ef0f188a6fdd 126 char sensor_data[4];
Marcomissyou 0:ef0f188a6fdd 127 int16_t H_OUT;
Marcomissyou 0:ef0f188a6fdd 128 int16_t T_OUT;
Marcomissyou 0:ef0f188a6fdd 129
Marcomissyou 0:ef0f188a6fdd 130 hts221_register_read(0xA8, sensor_data, 4);
Marcomissyou 0:ef0f188a6fdd 131
Marcomissyou 0:ef0f188a6fdd 132 H_OUT = (sensor_data[1] << 8) + sensor_data[0];
Marcomissyou 0:ef0f188a6fdd 133 T_OUT = (sensor_data[3] << 8) + sensor_data[2];
Marcomissyou 0:ef0f188a6fdd 134
Marcomissyou 0:ef0f188a6fdd 135 // convert negative 2's complement values to native negative value
Marcomissyou 0:ef0f188a6fdd 136 if (H_OUT&0x8000) H_OUT = -(0x8000-(0x7fff&H_OUT)); //((~H_OUT)+1);;
Marcomissyou 0:ef0f188a6fdd 137 if (T_OUT&0x8000) T_OUT = -(0x8000-(0x7fff&T_OUT));
Marcomissyou 0:ef0f188a6fdd 138
Marcomissyou 0:ef0f188a6fdd 139 *pTemp = linear_interpolation(T0_OUT, T0_DegC_cal, T1_OUT, T1_DegC_cal, T_OUT);
Marcomissyou 0:ef0f188a6fdd 140 *pHumi = linear_interpolation(H0_T0_OUT, H0_RH_cal, H1_T0_OUT, H1_RH_cal, H_OUT);
Marcomissyou 0:ef0f188a6fdd 141 // Constraint for measurement after calibration
Marcomissyou 0:ef0f188a6fdd 142 if ((int)*pHumi>MaxHumi-1 | (int)*pHumi==-72) *pHumi = MaxHumi;
Marcomissyou 0:ef0f188a6fdd 143 if ((int)*pHumi<MinHumi ) *pHumi = MinHumi;
Marcomissyou 0:ef0f188a6fdd 144 if ((int)*pTemp>MaxTemp-1) *pHumi = MaxTemp;
Marcomissyou 0:ef0f188a6fdd 145 if ((int)*pHumi<MinTemp ) *pHumi = MinTemp ;
Marcomissyou 0:ef0f188a6fdd 146 }
Marcomissyou 0:ef0f188a6fdd 147
Marcomissyou 0:ef0f188a6fdd 148 float linear_interpolation(int16_t x0, float y0, int16_t x1, float y1, float mes)
Marcomissyou 0:ef0f188a6fdd 149 {
Marcomissyou 0:ef0f188a6fdd 150 float a = (float) ((y1 - y0) / (x1 - x0));
Marcomissyou 0:ef0f188a6fdd 151 float b = (float) -a*x0 + y0;
Marcomissyou 0:ef0f188a6fdd 152 float cal = (float) a * mes + b;
Marcomissyou 0:ef0f188a6fdd 153 return cal;
Marcomissyou 0:ef0f188a6fdd 154 }
Marcomissyou 0:ef0f188a6fdd 155
Marcomissyou 0:ef0f188a6fdd 156 /*lint --flb "Leave library region" */
Marcomissyou 0:ef0f188a6fdd 157