Toru OHTSUKA / LPS331_SPI

STMicroelectronics LPS331AP, LPS25H SPI Library. This library is base on https://developer.mbed.org/users/nyamfg/code/LPS331_I2C/

Dependents:   LPS331_SPI_Test main_SPC

Fork of LPS331_I2C by NYA Manufacturing

LPS331_SPI.cpp@5:760a5e23dc62, 2016-07-28 (annotated)

Committer:
ohtsuka
Date:
Thu Jul 28 10:07:39 2016 +0000
Revision:
5:760a5e23dc62
Parent:
4:af2153bce185
Child:
6:309af2a65bd6
add quickStart().

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nyamfg 0:3fd57444bc65 1 /*
ohtsuka 3:5a56dd5131bb 2 * I2C/SPI digital pressure sensor "LPS331AP" library for SPI mode.
nyamfg 0:3fd57444bc65 3 *
ohtsuka 3:5a56dd5131bb 4 * Copyright(c) -2016 Toru OHTSUKA,
nyamfg 0:3fd57444bc65 5 * Copyright(c) -2013 unos@NYAMFG,
nyamfg 0:3fd57444bc65 6 * Released under the MIT License: http://mbed.org/license/mit
nyamfg 0:3fd57444bc65 7 *
ohtsuka 3:5a56dd5131bb 8 * revision: see LPS331_SPI.h.
nyamfg 0:3fd57444bc65 9 */
nyamfg 0:3fd57444bc65 10
ohtsuka 3:5a56dd5131bb 11 #include "LPS331_SPI.h"
nyamfg 0:3fd57444bc65 12
ohtsuka 4:af2153bce185 13 LPS331_SPI::LPS331_SPI(PinName mosi, PinName miso, PinName sclk, PinName cs_pin):_spi(mosi, miso, sclk), _cs(cs_pin)
nyamfg 0:3fd57444bc65 14 {
ohtsuka 4:af2153bce185 15 _spi.format(8,0);
ohtsuka 4:af2153bce185 16 _spi.frequency(1000000);
ohtsuka 4:af2153bce185 17
nyamfg 0:3fd57444bc65 18 _ctrlreg1 = 0x20;
nyamfg 0:3fd57444bc65 19 }
nyamfg 0:3fd57444bc65 20
ohtsuka 3:5a56dd5131bb 21 LPS331_SPI::~LPS331_SPI()
nyamfg 0:3fd57444bc65 22 {
nyamfg 0:3fd57444bc65 23 }
nyamfg 0:3fd57444bc65 24
ohtsuka 3:5a56dd5131bb 25 char LPS331_SPI::whoami()
nyamfg 0:3fd57444bc65 26 {
nyamfg 0:3fd57444bc65 27 return _read(0x0f);
nyamfg 0:3fd57444bc65 28 }
nyamfg 0:3fd57444bc65 29
ohtsuka 3:5a56dd5131bb 30 bool LPS331_SPI::isAvailable()
nyamfg 0:3fd57444bc65 31 {
nyamfg 0:3fd57444bc65 32 if(whoami() == 0xbb) { return true; }
nyamfg 0:3fd57444bc65 33
nyamfg 0:3fd57444bc65 34 return false;
nyamfg 0:3fd57444bc65 35 }
nyamfg 0:3fd57444bc65 36
ohtsuka 3:5a56dd5131bb 37 void LPS331_SPI::setResolution(char pressure_avg, char temp_avg)
nyamfg 0:3fd57444bc65 38 {
nyamfg 0:3fd57444bc65 39 _write(0x10, ((temp_avg & 0x07) << 4) | (pressure_avg & 0x0f));
nyamfg 0:3fd57444bc65 40 }
nyamfg 0:3fd57444bc65 41
ohtsuka 3:5a56dd5131bb 42 void LPS331_SPI::setActive(bool is_active)
nyamfg 0:3fd57444bc65 43 {
nyamfg 0:3fd57444bc65 44 if(is_active) {
nyamfg 0:3fd57444bc65 45 _ctrlreg1 |= 0x80;
nyamfg 0:3fd57444bc65 46 } else {
nyamfg 0:3fd57444bc65 47 _ctrlreg1 &= ~0x80;
nyamfg 0:3fd57444bc65 48 }
nyamfg 0:3fd57444bc65 49
nyamfg 0:3fd57444bc65 50 _write(0x20, _ctrlreg1);
nyamfg 0:3fd57444bc65 51 }
nyamfg 0:3fd57444bc65 52
ohtsuka 3:5a56dd5131bb 53 void LPS331_SPI::setDataRate(char datarate)
nyamfg 0:3fd57444bc65 54 {
nyamfg 0:3fd57444bc65 55 datarate &= 0x07;
nyamfg 0:3fd57444bc65 56
nyamfg 0:3fd57444bc65 57 _ctrlreg1 &= ~(0x07 << 4);
nyamfg 0:3fd57444bc65 58 _ctrlreg1 |= datarate << 4;
nyamfg 0:3fd57444bc65 59
nyamfg 0:3fd57444bc65 60 _write(0x20, _ctrlreg1);
nyamfg 0:3fd57444bc65 61 }
nyamfg 0:3fd57444bc65 62
ohtsuka 5:760a5e23dc62 63 void LPS331_SPI::quickStart()
ohtsuka 5:760a5e23dc62 64 {
ohtsuka 5:760a5e23dc62 65 // initialize
ohtsuka 5:760a5e23dc62 66 setResolution(LPS331_SPI_PRESSURE_AVG_1, LPS331_SPI_TEMP_AVG_1); // To prevent delays, not use average.
ohtsuka 5:760a5e23dc62 67 setDataRate(LPS331_SPI_DATARATE_25HZ);
ohtsuka 5:760a5e23dc62 68 setActive(true);
ohtsuka 5:760a5e23dc62 69 }
nyamfg 0:3fd57444bc65 70
ohtsuka 3:5a56dd5131bb 71 float LPS331_SPI::getPressure()
nyamfg 0:3fd57444bc65 72 {
nyamfg 1:b7d3d6e82049 73 char data[3];
nyamfg 0:3fd57444bc65 74 float pressure = 0;
nyamfg 1:b7d3d6e82049 75
nyamfg 1:b7d3d6e82049 76 _read_multibyte(0x28, data, 3);
nyamfg 1:b7d3d6e82049 77
nyamfg 1:b7d3d6e82049 78 pressure = data[0];
nyamfg 1:b7d3d6e82049 79 pressure += data[1] << 8;
nyamfg 1:b7d3d6e82049 80 pressure += data[2] << 16;
nyamfg 0:3fd57444bc65 81 pressure /= 4096.0;
nyamfg 0:3fd57444bc65 82
nyamfg 0:3fd57444bc65 83 return pressure;
nyamfg 0:3fd57444bc65 84 }
nyamfg 0:3fd57444bc65 85
ohtsuka 3:5a56dd5131bb 86 float LPS331_SPI::getTemperature()
nyamfg 0:3fd57444bc65 87 {
nyamfg 1:b7d3d6e82049 88 char data[2];
nyamfg 0:3fd57444bc65 89 short temp = 0;
nyamfg 1:b7d3d6e82049 90
nyamfg 1:b7d3d6e82049 91 _read_multibyte(0x2b, data, 2);
nyamfg 1:b7d3d6e82049 92
nyamfg 1:b7d3d6e82049 93 temp = data[0];
nyamfg 1:b7d3d6e82049 94 temp |= data[1] << 8;
nyamfg 0:3fd57444bc65 95
nyamfg 0:3fd57444bc65 96 return (float)(42.5 + temp / 480.0);
nyamfg 0:3fd57444bc65 97 }
nyamfg 0:3fd57444bc65 98
nyamfg 0:3fd57444bc65 99
ohtsuka 3:5a56dd5131bb 100 void LPS331_SPI::_write(char subaddress, char data)
nyamfg 0:3fd57444bc65 101 {
ohtsuka 4:af2153bce185 102 _cs = 0;
ohtsuka 4:af2153bce185 103 _spi.write(subaddress);
ohtsuka 4:af2153bce185 104 _spi.write(data);
ohtsuka 4:af2153bce185 105 _cs = 1;
nyamfg 0:3fd57444bc65 106 }
nyamfg 0:3fd57444bc65 107
ohtsuka 3:5a56dd5131bb 108 char LPS331_SPI::_read(char subaddress)
nyamfg 0:3fd57444bc65 109 {
nyamfg 0:3fd57444bc65 110 char result = 0;
nyamfg 0:3fd57444bc65 111
ohtsuka 4:af2153bce185 112 _cs = 0;
ohtsuka 4:af2153bce185 113 _spi.write(subaddress | 0x80);
ohtsuka 4:af2153bce185 114 result = _spi.write(0);
ohtsuka 4:af2153bce185 115 _cs = 1;
ohtsuka 4:af2153bce185 116
nyamfg 0:3fd57444bc65 117 return result;
nyamfg 0:3fd57444bc65 118 }
nyamfg 0:3fd57444bc65 119
ohtsuka 3:5a56dd5131bb 120 void LPS331_SPI::_read_multibyte(char startsubaddress, char* data, char count)
nyamfg 1:b7d3d6e82049 121 {
ohtsuka 4:af2153bce185 122 _cs = 0;
ohtsuka 4:af2153bce185 123 _spi.write(startsubaddress | 0x80 | 0x40);
nyamfg 1:b7d3d6e82049 124
nyamfg 1:b7d3d6e82049 125 for(int i = 0; i < count; i++) {
ohtsuka 4:af2153bce185 126 data[i] = _spi.write(0);
nyamfg 1:b7d3d6e82049 127 }
ohtsuka 4:af2153bce185 128 _cs = 1;
ohtsuka 4:af2153bce185 129
nyamfg 1:b7d3d6e82049 130 }