Kenji Arai / LPS25H

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

Dependents:   Altimu10v4

LPS25H.cpp@0:8fc511bd51af, 2015-02-22 (annotated)

Committer:
kenjiArai
Date:
Sun Feb 22 00:59:52 2015 +0000
Revision:
0:8fc511bd51af
Child:
1:9db35e42ddbc
MEMS pressure sensor by STMicroelectronics. FIFO Hardware digital filter as default.

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 0:8fc511bd51af 5 * http://www.st-japan.co.jp/web/catalog/sense_power/FM89/SC1316/PF255230?s_searchtype=partnumber
kenjiArai 0:8fc511bd51af 6 *
kenjiArai 0:8fc511bd51af 7 * Copyright (c) 2015 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 0:8fc511bd51af 11 * Revised: Feburary 22nd, 2015
kenjiArai 0:8fc511bd51af 12 *
kenjiArai 0:8fc511bd51af 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
kenjiArai 0:8fc511bd51af 14 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
kenjiArai 0:8fc511bd51af 15 * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
kenjiArai 0:8fc511bd51af 16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
kenjiArai 0:8fc511bd51af 17 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
kenjiArai 0:8fc511bd51af 18 */
kenjiArai 0:8fc511bd51af 19
kenjiArai 0:8fc511bd51af 20 #include "LPS25H.h"
kenjiArai 0:8fc511bd51af 21
kenjiArai 0:8fc511bd51af 22 LPS25H::LPS25H (PinName p_sda, PinName p_scl, uint8_t addr) : _i2c(p_sda, p_scl)
kenjiArai 0:8fc511bd51af 23 {
kenjiArai 0:8fc511bd51af 24 LPS25H_addr = addr;
kenjiArai 0:8fc511bd51af 25 LPS25H_mode = FIFO_HW_FILTER;
kenjiArai 0:8fc511bd51af 26 init();
kenjiArai 0:8fc511bd51af 27 }
kenjiArai 0:8fc511bd51af 28
kenjiArai 0:8fc511bd51af 29 LPS25H::LPS25H (PinName p_sda, PinName p_scl, uint8_t addr, uint8_t mode) : _i2c(p_sda, p_scl)
kenjiArai 0:8fc511bd51af 30 {
kenjiArai 0:8fc511bd51af 31 LPS25H_addr = addr;
kenjiArai 0:8fc511bd51af 32 LPS25H_mode = mode;
kenjiArai 0:8fc511bd51af 33 init();
kenjiArai 0:8fc511bd51af 34 }
kenjiArai 0:8fc511bd51af 35
kenjiArai 0:8fc511bd51af 36 LPS25H::LPS25H (I2C& p_i2c, uint8_t addr) : _i2c(p_i2c)
kenjiArai 0:8fc511bd51af 37 {
kenjiArai 0:8fc511bd51af 38 LPS25H_addr = addr;
kenjiArai 0:8fc511bd51af 39 LPS25H_mode = FIFO_HW_FILTER;
kenjiArai 0:8fc511bd51af 40 init();
kenjiArai 0:8fc511bd51af 41 }
kenjiArai 0:8fc511bd51af 42
kenjiArai 0:8fc511bd51af 43 LPS25H::LPS25H (I2C& p_i2c, uint8_t addr, uint8_t mode) : _i2c(p_i2c)
kenjiArai 0:8fc511bd51af 44 {
kenjiArai 0:8fc511bd51af 45 LPS25H_addr = addr;
kenjiArai 0:8fc511bd51af 46 LPS25H_mode = mode;
kenjiArai 0:8fc511bd51af 47 init();
kenjiArai 0:8fc511bd51af 48 }
kenjiArai 0:8fc511bd51af 49
kenjiArai 0:8fc511bd51af 50 /////////////// Initialize ////////////////////////////////
kenjiArai 0:8fc511bd51af 51 void LPS25H::init(void)
kenjiArai 0:8fc511bd51af 52 {
kenjiArai 0:8fc511bd51af 53 _i2c.frequency(100000);
kenjiArai 0:8fc511bd51af 54 // Check acc is available of not
kenjiArai 0:8fc511bd51af 55 dt[0] = LPS25H_WHO_AM_I;
kenjiArai 0:8fc511bd51af 56 _i2c.write(LPS25H_addr, dt, 1, true);
kenjiArai 0:8fc511bd51af 57 _i2c.read(LPS25H_addr, dt, 1, false);
kenjiArai 0:8fc511bd51af 58 if (dt[0] == I_AM_LPS25H) {
kenjiArai 0:8fc511bd51af 59 LPS25H_id = I_AM_LPS25H;
kenjiArai 0:8fc511bd51af 60 LPS25H_ready = 1;
kenjiArai 0:8fc511bd51af 61 } else {
kenjiArai 0:8fc511bd51af 62 LPS25H_id = 0;
kenjiArai 0:8fc511bd51af 63 LPS25H_ready = 0;
kenjiArai 0:8fc511bd51af 64 return; // acc chip is NOT on I2C line then terminate
kenjiArai 0:8fc511bd51af 65 }
kenjiArai 0:8fc511bd51af 66 if (LPS25H_mode == FIFO_HW_FILTER){
kenjiArai 0:8fc511bd51af 67 // Hardware digital filter
kenjiArai 0:8fc511bd51af 68 // AN4450 April 2014 Rev1 P20/26, Filter enabling and suggested configuration
kenjiArai 0:8fc511bd51af 69 dt[0] = LPS25H_RES_CONF;
kenjiArai 0:8fc511bd51af 70 dt[1] = 0x05;
kenjiArai 0:8fc511bd51af 71 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 72 dt[0] = LPS25H_FIFO_CTRL;
kenjiArai 0:8fc511bd51af 73 dt[1] = 0xdf;
kenjiArai 0:8fc511bd51af 74 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 75 dt[0] = LPS25H_CTRL_REG2;
kenjiArai 0:8fc511bd51af 76 dt[1] = 0x40;
kenjiArai 0:8fc511bd51af 77 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 78 dt[0] = LPS25H_CTRL_REG1;
kenjiArai 0:8fc511bd51af 79 dt[1] = 0x90;
kenjiArai 0:8fc511bd51af 80 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 81 } else {
kenjiArai 0:8fc511bd51af 82 dt[0] = LPS25H_CTRL_REG2;
kenjiArai 0:8fc511bd51af 83 dt[1] = 0x0;
kenjiArai 0:8fc511bd51af 84 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 85 dt[0] = LPS25H_CTRL_REG1;
kenjiArai 0:8fc511bd51af 86 dt[1] = CR_STD_SET;
kenjiArai 0:8fc511bd51af 87 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 88 }
kenjiArai 0:8fc511bd51af 89 }
kenjiArai 0:8fc511bd51af 90
kenjiArai 0:8fc511bd51af 91 /////////////// Start conv. and gwt all data //////////////
kenjiArai 0:8fc511bd51af 92 void LPS25H::get(void)
kenjiArai 0:8fc511bd51af 93 {
kenjiArai 0:8fc511bd51af 94 if (LPS25H_ready == 0) {
kenjiArai 0:8fc511bd51af 95 press = 0;
kenjiArai 0:8fc511bd51af 96 temp = 0;
kenjiArai 0:8fc511bd51af 97 return;
kenjiArai 0:8fc511bd51af 98 }
kenjiArai 0:8fc511bd51af 99 dt[0] = LPS25H_PRESS_POUT_XL | 0x80;
kenjiArai 0:8fc511bd51af 100 _i2c.write(LPS25H_addr, dt, 1, true);
kenjiArai 0:8fc511bd51af 101 _i2c.read(LPS25H_addr, dt, 3, false);
kenjiArai 0:8fc511bd51af 102 press = dt[2] << 16 | dt[1] << 8 | dt[0];
kenjiArai 0:8fc511bd51af 103 dt[0] = LPS25H_TEMP_OUT_L | 0x80;
kenjiArai 0:8fc511bd51af 104 _i2c.write(LPS25H_addr, dt, 1, true);
kenjiArai 0:8fc511bd51af 105 _i2c.read(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 106 temp = dt[1] << 8 | dt[0];
kenjiArai 0:8fc511bd51af 107 }
kenjiArai 0:8fc511bd51af 108
kenjiArai 0:8fc511bd51af 109 /////////////// Read data from sensor /////////////////////
kenjiArai 0:8fc511bd51af 110 float LPS25H::pressure()
kenjiArai 0:8fc511bd51af 111 {
kenjiArai 0:8fc511bd51af 112 return (float)press / 4096;
kenjiArai 0:8fc511bd51af 113 }
kenjiArai 0:8fc511bd51af 114
kenjiArai 0:8fc511bd51af 115 /////////////// Read data from sensor /////////////////////
kenjiArai 0:8fc511bd51af 116 float LPS25H::temperature()
kenjiArai 0:8fc511bd51af 117 {
kenjiArai 0:8fc511bd51af 118 return (float)temp / 480 + 42.5;
kenjiArai 0:8fc511bd51af 119 }
kenjiArai 0:8fc511bd51af 120
kenjiArai 0:8fc511bd51af 121 /////////////// ID ////////////////////////////////////////
kenjiArai 0:8fc511bd51af 122 uint8_t LPS25H::read_id()
kenjiArai 0:8fc511bd51af 123 {
kenjiArai 0:8fc511bd51af 124 dt[0] = LPS25H_WHO_AM_I;
kenjiArai 0:8fc511bd51af 125 _i2c.write(LPS25H_addr, dt, 1, true);
kenjiArai 0:8fc511bd51af 126 _i2c.read(LPS25H_addr, dt, 1, false);
kenjiArai 0:8fc511bd51af 127 return (uint8_t)dt[0];
kenjiArai 0:8fc511bd51af 128 }
kenjiArai 0:8fc511bd51af 129
kenjiArai 0:8fc511bd51af 130 /////////////// I2C Freq. /////////////////////////////////
kenjiArai 0:8fc511bd51af 131 void LPS25H::frequency(int hz)
kenjiArai 0:8fc511bd51af 132 {
kenjiArai 0:8fc511bd51af 133 _i2c.frequency(hz);
kenjiArai 0:8fc511bd51af 134 }
kenjiArai 0:8fc511bd51af 135
kenjiArai 0:8fc511bd51af 136 /////////////// General purpose R/W ///////////////////////
kenjiArai 0:8fc511bd51af 137 uint8_t LPS25H::read_reg(uint8_t addr)
kenjiArai 0:8fc511bd51af 138 {
kenjiArai 0:8fc511bd51af 139 if (LPS25H_ready == 1) {
kenjiArai 0:8fc511bd51af 140 dt[0] = addr;
kenjiArai 0:8fc511bd51af 141 _i2c.write(LPS25H_addr, dt, 1, true);
kenjiArai 0:8fc511bd51af 142 _i2c.read(LPS25H_addr, dt, 1, false);
kenjiArai 0:8fc511bd51af 143 } else {
kenjiArai 0:8fc511bd51af 144 dt[0] = 0xff;
kenjiArai 0:8fc511bd51af 145 }
kenjiArai 0:8fc511bd51af 146 return (uint8_t)dt[0];
kenjiArai 0:8fc511bd51af 147 }
kenjiArai 0:8fc511bd51af 148
kenjiArai 0:8fc511bd51af 149 void LPS25H::write_reg(uint8_t addr, uint8_t data)
kenjiArai 0:8fc511bd51af 150 {
kenjiArai 0:8fc511bd51af 151 if (LPS25H_ready == 1) {
kenjiArai 0:8fc511bd51af 152 dt[0] = addr;
kenjiArai 0:8fc511bd51af 153 dt[1] = data;
kenjiArai 0:8fc511bd51af 154 _i2c.write(LPS25H_addr, dt, 2, false);
kenjiArai 0:8fc511bd51af 155 }
kenjiArai 0:8fc511bd51af 156 }