Renan Alves / LPS25H

MEMS pressure sensor by STMicroelectronics. FIFO Hardware digital filter as default.

Fork of LPS25H by Kenji Arai

LPS25H.cpp@2:92691fd6cb75, 2018-10-14 (annotated)

Committer:
renanbmx123
Date:
Sun Oct 14 02:00:36 2018 +0000
Revision:
2:92691fd6cb75
Parent:
1:9db35e42ddbc 
altitude calculation add

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kenjiArai 0:8fc511bd51af 1 /*
kenjiArai 0:8fc511bd51af 2 * mbed library program
kenjiArai 0:8fc511bd51af 3 * LPS25H MEMS pressure sensor: 260-1260 hPa absolute digital output barometer
kenjiArai 0:8fc511bd51af 4 * made by STMicroelectronics
kenjiArai 1:9db35e42ddbc 5 * http://www.st-japan.co.jp/web/catalog/sense_power/FM89/SC1316/PF255230
kenjiArai 0:8fc511bd51af 6 *
kenjiArai 1:9db35e42ddbc 7 * Copyright (c) 2015,'17 Kenji Arai / JH1PJL
kenjiArai 0:8fc511bd51af 8 * http://www.page.sannet.ne.jp/kenjia/index.html
kenjiArai 0:8fc511bd51af 9 * http://mbed.org/users/kenjiArai/
kenjiArai 0:8fc511bd51af 10 * Created: Feburary 21st, 2015
kenjiArai 1:9db35e42ddbc 11 * Revised: August 21st, 2017
kenjiArai 0:8fc511bd51af 12 */
kenjiArai 0:8fc511bd51af 13
kenjiArai 0:8fc511bd51af 14 #include "LPS25H.h"
kenjiArai 0:8fc511bd51af 15
renanbmx123 2:92691fd6cb75 16 LPS25H::LPS25H (PinName p_sda, PinName p_scl) :
kenjiArai 1:9db35e42ddbc 17 _i2c_p(new I2C(p_sda, p_scl)), _i2c(*_i2c_p)
kenjiArai 0:8fc511bd51af 18 {
renanbmx123 2:92691fd6cb75 19 LPS25H_addr = LPS25H_V_CHIP_ADDR;
kenjiArai 0:8fc511bd51af 20 LPS25H_mode = FIFO_HW_FILTER;
kenjiArai 0:8fc511bd51af 21 init();
kenjiArai 0:8fc511bd51af 22 }
renanbmx123 2:92691fd6cb75 23 /*
kenjiArai 1:9db35e42ddbc 24 LPS25H::LPS25H (PinName p_sda, PinName p_scl, uint8_t addr, uint8_t mode) :
kenjiArai 1:9db35e42ddbc 25 _i2c_p(new I2C(p_sda, p_scl)), _i2c(*_i2c_p)
kenjiArai 0:8fc511bd51af 26 {
kenjiArai 0:8fc511bd51af 27 LPS25H_addr = addr;
kenjiArai 0:8fc511bd51af 28 LPS25H_mode = mode;
kenjiArai 0:8fc511bd51af 29 init();
kenjiArai 0:8fc511bd51af 30 }
kenjiArai 0:8fc511bd51af 31
kenjiArai 0:8fc511bd51af 32 LPS25H::LPS25H (I2C& p_i2c, uint8_t addr) : _i2c(p_i2c)
kenjiArai 0:8fc511bd51af 33 {
kenjiArai 0:8fc511bd51af 34 LPS25H_addr = addr;
kenjiArai 0:8fc511bd51af 35 LPS25H_mode = FIFO_HW_FILTER;
kenjiArai 0:8fc511bd51af 36 init();
kenjiArai 0:8fc511bd51af 37 }
kenjiArai 0:8fc511bd51af 38
kenjiArai 0:8fc511bd51af 39 LPS25H::LPS25H (I2C& p_i2c, uint8_t addr, uint8_t mode) : _i2c(p_i2c)
kenjiArai 0:8fc511bd51af 40 {
kenjiArai 0:8fc511bd51af 41 LPS25H_addr = addr;
kenjiArai 0:8fc511bd51af 42 LPS25H_mode = mode;
kenjiArai 0:8fc511bd51af 43 init();
kenjiArai 0:8fc511bd51af 44 }
renanbmx123 2:92691fd6cb75 45 */
kenjiArai 0:8fc511bd51af 46 /////////////// Initialize ////////////////////////////////
kenjiArai 0:8fc511bd51af 47 void LPS25H::init(void)
kenjiArai 0:8fc511bd51af 48 {
kenjiArai 0:8fc511bd51af 49 _i2c.frequency(100000);
kenjiArai 0:8fc511bd51af 50 // Check acc is available of not
renanbmx123 2:92691fd6cb75 51 //dt[0] = LPS25H_WHO_AM_I;
renanbmx123 2:92691fd6cb75 52 //_i2c.write(LPS25H_addr, dt, 1, true);
renanbmx123 2:92691fd6cb75 53 //_i2c.read(LPS25H_addr, dt, 1, false);
renanbmx123 2:92691fd6cb75 54 // if (dt[0] == I_AM_LPS25H) {
renanbmx123 2:92691fd6cb75 55 // LPS25H_id = I_AM_LPS25H;
renanbmx123 2:92691fd6cb75 56 // LPS25H_ready = 1;
renanbmx123 2:92691fd6cb75 57 // } else {
renanbmx123 2:92691fd6cb75 58 // LPS25H_id = 0;
renanbmx123 2:92691fd6cb75 59 // LPS25H_ready = 0;
renanbmx123 2:92691fd6cb75 60 // return; // acc chip is NOT on I2C line then terminate
renanbmx123 2:92691fd6cb75 61 // }
kenjiArai 0:8fc511bd51af 62 if (LPS25H_mode == FIFO_HW_FILTER){
kenjiArai 0:8fc511bd51af 63 // Hardware digital filter
kenjiArai 1:9db35e42ddbc 64 // AN4450 April 2014 Rev1 P20/26,
kenjiArai 1:9db35e42ddbc 65 // Filter enabling and suggested configuration
kenjiArai 0:8fc511bd51af 66 dt[0] = LPS25H_RES_CONF;
kenjiArai 0:8fc511bd51af 67 dt[1] = 0x05;
kenjiArai 0:8fc511bd51af 68 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 69 dt[0] = LPS25H_FIFO_CTRL;
kenjiArai 0:8fc511bd51af 70 dt[1] = 0xdf;
kenjiArai 0:8fc511bd51af 71 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 72 dt[0] = LPS25H_CTRL_REG2;
kenjiArai 0:8fc511bd51af 73 dt[1] = 0x40;
kenjiArai 0:8fc511bd51af 74 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 75 dt[0] = LPS25H_CTRL_REG1;
kenjiArai 0:8fc511bd51af 76 dt[1] = 0x90;
kenjiArai 0:8fc511bd51af 77 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 78 } else {
kenjiArai 0:8fc511bd51af 79 dt[0] = LPS25H_CTRL_REG2;
kenjiArai 0:8fc511bd51af 80 dt[1] = 0x0;
kenjiArai 1:9db35e42ddbc 81 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 82 dt[0] = LPS25H_CTRL_REG1;
kenjiArai 0:8fc511bd51af 83 dt[1] = CR_STD_SET;
kenjiArai 0:8fc511bd51af 84 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 85 }
kenjiArai 0:8fc511bd51af 86 }
kenjiArai 0:8fc511bd51af 87
kenjiArai 0:8fc511bd51af 88 /////////////// Start conv. and gwt all data //////////////
kenjiArai 0:8fc511bd51af 89 void LPS25H::get(void)
kenjiArai 0:8fc511bd51af 90 {
renanbmx123 2:92691fd6cb75 91 /* if (LPS25H_ready == 0) {
kenjiArai 0:8fc511bd51af 92 press = 0;
kenjiArai 0:8fc511bd51af 93 temp = 0;
renanbmx123 2:92691fd6cb75 94 alt = 0;
kenjiArai 0:8fc511bd51af 95 return;
renanbmx123 2:92691fd6cb75 96 }*/
kenjiArai 0:8fc511bd51af 97 dt[0] = LPS25H_PRESS_POUT_XL | 0x80;
kenjiArai 0:8fc511bd51af 98 _i2c.write(LPS25H_addr, dt, 1, true);
kenjiArai 0:8fc511bd51af 99 _i2c.read(LPS25H_addr, dt, 3, false);
kenjiArai 0:8fc511bd51af 100 press = dt[2] << 16 | dt[1] << 8 | dt[0];
renanbmx123 2:92691fd6cb75 101 // dt[0] = LPS25H_TEMP_OUT_L | 0x80;
renanbmx123 2:92691fd6cb75 102 // _i2c.write(LPS25H_addr, dt, 1, true);
renanbmx123 2:92691fd6cb75 103 // _i2c.read(LPS25H_addr, dt, 2, false);
renanbmx123 2:92691fd6cb75 104 // temp = dt[1] << 8 | dt[0];
renanbmx123 2:92691fd6cb75 105 alt = (1-pow((press/4096)/1013.25,0.190284))*145366.45;
kenjiArai 0:8fc511bd51af 106 }
kenjiArai 0:8fc511bd51af 107
kenjiArai 0:8fc511bd51af 108 /////////////// Read data from sensor /////////////////////
kenjiArai 0:8fc511bd51af 109 float LPS25H::pressure()
kenjiArai 0:8fc511bd51af 110 {
kenjiArai 0:8fc511bd51af 111 return (float)press / 4096;
kenjiArai 0:8fc511bd51af 112 }
kenjiArai 0:8fc511bd51af 113
kenjiArai 0:8fc511bd51af 114 /////////////// Read data from sensor /////////////////////
renanbmx123 2:92691fd6cb75 115 /*float LPS25H::temperature()
kenjiArai 0:8fc511bd51af 116 {
kenjiArai 0:8fc511bd51af 117 return (float)temp / 480 + 42.5;
renanbmx123 2:92691fd6cb75 118 }*/
renanbmx123 2:92691fd6cb75 119 /////////////// Read data from sensor /////////////////////
renanbmx123 2:92691fd6cb75 120 float LPS25H::altitude(void) {
renanbmx123 2:92691fd6cb75 121
renanbmx123 2:92691fd6cb75 122 return alt/3.280839895;
kenjiArai 0:8fc511bd51af 123 }
kenjiArai 0:8fc511bd51af 124
kenjiArai 0:8fc511bd51af 125 /////////////// ID ////////////////////////////////////////
renanbmx123 2:92691fd6cb75 126 /*uint8_t LPS25H::read_id()
kenjiArai 0:8fc511bd51af 127 {
kenjiArai 0:8fc511bd51af 128 dt[0] = LPS25H_WHO_AM_I;
kenjiArai 0:8fc511bd51af 129 _i2c.write(LPS25H_addr, dt, 1, true);
kenjiArai 0:8fc511bd51af 130 _i2c.read(LPS25H_addr, dt, 1, false);
kenjiArai 0:8fc511bd51af 131 return (uint8_t)dt[0];
renanbmx123 2:92691fd6cb75 132 }*/
kenjiArai 0:8fc511bd51af 133
kenjiArai 0:8fc511bd51af 134 /////////////// I2C Freq. /////////////////////////////////
kenjiArai 0:8fc511bd51af 135 void LPS25H::frequency(int hz)
kenjiArai 0:8fc511bd51af 136 {
kenjiArai 0:8fc511bd51af 137 _i2c.frequency(hz);
kenjiArai 0:8fc511bd51af 138 }
kenjiArai 0:8fc511bd51af 139
kenjiArai 0:8fc511bd51af 140 /////////////// General purpose R/W ///////////////////////
kenjiArai 0:8fc511bd51af 141 uint8_t LPS25H::read_reg(uint8_t addr)
kenjiArai 0:8fc511bd51af 142 {
kenjiArai 0:8fc511bd51af 143 if (LPS25H_ready == 1) {
kenjiArai 0:8fc511bd51af 144 dt[0] = addr;
kenjiArai 0:8fc511bd51af 145 _i2c.write(LPS25H_addr, dt, 1, true);
kenjiArai 0:8fc511bd51af 146 _i2c.read(LPS25H_addr, dt, 1, false);
kenjiArai 0:8fc511bd51af 147 } else {
kenjiArai 0:8fc511bd51af 148 dt[0] = 0xff;
kenjiArai 0:8fc511bd51af 149 }
kenjiArai 0:8fc511bd51af 150 return (uint8_t)dt[0];
kenjiArai 0:8fc511bd51af 151 }
kenjiArai 0:8fc511bd51af 152
kenjiArai 0:8fc511bd51af 153 void LPS25H::write_reg(uint8_t addr, uint8_t data)
kenjiArai 0:8fc511bd51af 154 {
kenjiArai 0:8fc511bd51af 155 if (LPS25H_ready == 1) {
kenjiArai 0:8fc511bd51af 156 dt[0] = addr;
kenjiArai 0:8fc511bd51af 157 dt[1] = data;
kenjiArai 0:8fc511bd51af 158 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 159 }
kenjiArai 0:8fc511bd51af 160 }