Soyoon Kim / Mbed 2 deprecated mbed_Datalogger

Success!

Dependencies:   mbed

Barometer.cpp@0:9f0027e4c618, 2016-07-19 (annotated)

Committer:
Soyoon
Date:
Tue Jul 19 15:47:17 2016 +0000
Revision:
0:9f0027e4c618
Robo Frien

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Soyoon 0:9f0027e4c618 1 #include "mbed.h"
Soyoon 0:9f0027e4c618 2 #include "Barometer.h"
Soyoon 0:9f0027e4c618 3
Soyoon 0:9f0027e4c618 4 #define WEATHER_Barometer 0xee
Soyoon 0:9f0027e4c618 5 #define xpow(x, y) ((long)1 << y)
Soyoon 0:9f0027e4c618 6
Soyoon 0:9f0027e4c618 7
Soyoon 0:9f0027e4c618 8 Barometer::Barometer (PinName p_sda, PinName p_scl, Barometer_oss p_oss) : i2c(p_sda, p_scl) {
Soyoon 0:9f0027e4c618 9 init(p_oss);
Soyoon 0:9f0027e4c618 10 }
Soyoon 0:9f0027e4c618 11
Soyoon 0:9f0027e4c618 12 Barometer::Barometer (I2C& p_i2c, Barometer_oss p_oss) : i2c(p_i2c) {
Soyoon 0:9f0027e4c618 13 init(p_oss);
Soyoon 0:9f0027e4c618 14 }
Soyoon 0:9f0027e4c618 15
Soyoon 0:9f0027e4c618 16
Soyoon 0:9f0027e4c618 17 float Barometer::get_temperature() {
Soyoon 0:9f0027e4c618 18 return temperature;
Soyoon 0:9f0027e4c618 19 }
Soyoon 0:9f0027e4c618 20
Soyoon 0:9f0027e4c618 21 float Barometer::get_pressure() {
Soyoon 0:9f0027e4c618 22 return pressure;
Soyoon 0:9f0027e4c618 23 }
Soyoon 0:9f0027e4c618 24
Soyoon 0:9f0027e4c618 25 void Barometer::update () {
Soyoon 0:9f0027e4c618 26 long t, p, ut, up, x1, x2, x3, b3, b5, b6;
Soyoon 0:9f0027e4c618 27 unsigned long b4, b7;
Soyoon 0:9f0027e4c618 28
Soyoon 0:9f0027e4c618 29 twi_writechar(WEATHER_Barometer, 0xf4, 0x2e);
Soyoon 0:9f0027e4c618 30 wait(0.01);
Soyoon 0:9f0027e4c618 31 ut = twi_readshort(WEATHER_Barometer, 0xf6);
Soyoon 0:9f0027e4c618 32
Soyoon 0:9f0027e4c618 33 twi_writechar(WEATHER_Barometer, 0xf4, 0x34 | (oss << 6));
Soyoon 0:9f0027e4c618 34 wait(0.05);
Soyoon 0:9f0027e4c618 35 up = twi_readlong(WEATHER_Barometer, 0xf6) >> (8 - oss);
Soyoon 0:9f0027e4c618 36
Soyoon 0:9f0027e4c618 37 x1 = (ut - ac6) * ac5 / xpow(2, 15);
Soyoon 0:9f0027e4c618 38 x2 = (long)mc * xpow(2, 11) / (x1 + md);
Soyoon 0:9f0027e4c618 39 b5 = x1 + x2;
Soyoon 0:9f0027e4c618 40 t = (b5 + 8) / xpow(2, 4);
Soyoon 0:9f0027e4c618 41 temperature = (float)t / 10.0;
Soyoon 0:9f0027e4c618 42
Soyoon 0:9f0027e4c618 43 b6 = b5 - 4000;
Soyoon 0:9f0027e4c618 44 x1 = (b2 * (b6 * b6 / xpow(2, 12))) / xpow(2, 11);
Soyoon 0:9f0027e4c618 45 x2 = ac2 * b6 / xpow(2, 11);
Soyoon 0:9f0027e4c618 46 x3 = x1 + x2;
Soyoon 0:9f0027e4c618 47 b3 = ((((unsigned long)ac1 * 4 + x3) << oss) + 2) / 4;
Soyoon 0:9f0027e4c618 48 x1 = ac3 * b6 / xpow(2, 13);
Soyoon 0:9f0027e4c618 49 x2 = (b1 * (b6 * b6 / xpow(2, 12))) / xpow(2, 16);
Soyoon 0:9f0027e4c618 50 x3 = ((x1 + x2) + 2) / xpow(2, 2);
Soyoon 0:9f0027e4c618 51 b4 = ac4 * (unsigned long)(x3 + 32768) / xpow(2, 15);
Soyoon 0:9f0027e4c618 52 b7 = ((unsigned long)up - b3) * (50000 >> oss);
Soyoon 0:9f0027e4c618 53 if (b7 < (unsigned long)0x80000000) {
Soyoon 0:9f0027e4c618 54 p = (b7 * 2) / b4;
Soyoon 0:9f0027e4c618 55 } else {
Soyoon 0:9f0027e4c618 56 p = (b7 / b4) * 2;
Soyoon 0:9f0027e4c618 57 }
Soyoon 0:9f0027e4c618 58 x1 = (p / xpow(2, 8)) * (p / xpow(2, 8));
Soyoon 0:9f0027e4c618 59 x1 = (x1 * 3038) / xpow(2, 16);
Soyoon 0:9f0027e4c618 60 x2 = (-7357 * p) / xpow(2, 16);
Soyoon 0:9f0027e4c618 61 p = p + (x1 + x2 + 3791) / xpow(2, 4);
Soyoon 0:9f0027e4c618 62 pressure = (float)p / 100.0;
Soyoon 0:9f0027e4c618 63 }
Soyoon 0:9f0027e4c618 64
Soyoon 0:9f0027e4c618 65 void Barometer::init (Barometer_oss p_oss) {
Soyoon 0:9f0027e4c618 66 ac1 = twi_readshort(WEATHER_Barometer, 0xaa);
Soyoon 0:9f0027e4c618 67 ac2 = twi_readshort(WEATHER_Barometer, 0xac);
Soyoon 0:9f0027e4c618 68 ac3 = twi_readshort(WEATHER_Barometer, 0xae);
Soyoon 0:9f0027e4c618 69 ac4 = twi_readshort(WEATHER_Barometer, 0xb0);
Soyoon 0:9f0027e4c618 70 ac5 = twi_readshort(WEATHER_Barometer, 0xb2);
Soyoon 0:9f0027e4c618 71 ac6 = twi_readshort(WEATHER_Barometer, 0xb4);
Soyoon 0:9f0027e4c618 72 b1 = twi_readshort(WEATHER_Barometer, 0xb6);
Soyoon 0:9f0027e4c618 73 b2 = twi_readshort(WEATHER_Barometer, 0xb8);
Soyoon 0:9f0027e4c618 74 mb = twi_readshort(WEATHER_Barometer, 0xba);
Soyoon 0:9f0027e4c618 75 mc = twi_readshort(WEATHER_Barometer, 0xbc);
Soyoon 0:9f0027e4c618 76 md = twi_readshort(WEATHER_Barometer, 0xbe);
Soyoon 0:9f0027e4c618 77 oss = p_oss;
Soyoon 0:9f0027e4c618 78 }
Soyoon 0:9f0027e4c618 79
Soyoon 0:9f0027e4c618 80 unsigned short Barometer::twi_readshort (int id, int addr) {
Soyoon 0:9f0027e4c618 81 unsigned short i;
Soyoon 0:9f0027e4c618 82
Soyoon 0:9f0027e4c618 83 i2c.start();
Soyoon 0:9f0027e4c618 84 i2c.write(id);
Soyoon 0:9f0027e4c618 85 i2c.write(addr);
Soyoon 0:9f0027e4c618 86
Soyoon 0:9f0027e4c618 87 i2c.start();
Soyoon 0:9f0027e4c618 88 i2c.write(id | 1);
Soyoon 0:9f0027e4c618 89 i = i2c.read(1) << 8;
Soyoon 0:9f0027e4c618 90 i |= i2c.read(0);
Soyoon 0:9f0027e4c618 91 i2c.stop();
Soyoon 0:9f0027e4c618 92
Soyoon 0:9f0027e4c618 93 return i;
Soyoon 0:9f0027e4c618 94 }
Soyoon 0:9f0027e4c618 95
Soyoon 0:9f0027e4c618 96 unsigned long Barometer::twi_readlong (int id, int addr) {
Soyoon 0:9f0027e4c618 97 unsigned long i;
Soyoon 0:9f0027e4c618 98
Soyoon 0:9f0027e4c618 99 i2c.start();
Soyoon 0:9f0027e4c618 100 i2c.write(id);
Soyoon 0:9f0027e4c618 101 i2c.write(addr);
Soyoon 0:9f0027e4c618 102
Soyoon 0:9f0027e4c618 103 i2c.start();
Soyoon 0:9f0027e4c618 104 i2c.write(id | 1);
Soyoon 0:9f0027e4c618 105 i = i2c.read(1) << 16;
Soyoon 0:9f0027e4c618 106 i |= i2c.read(1) << 8;
Soyoon 0:9f0027e4c618 107 i |= i2c.read(0);
Soyoon 0:9f0027e4c618 108 i2c.stop();
Soyoon 0:9f0027e4c618 109
Soyoon 0:9f0027e4c618 110 return i;
Soyoon 0:9f0027e4c618 111 }
Soyoon 0:9f0027e4c618 112
Soyoon 0:9f0027e4c618 113 void Barometer::twi_writechar (int id, int addr, int dat) {
Soyoon 0:9f0027e4c618 114
Soyoon 0:9f0027e4c618 115 i2c.start();
Soyoon 0:9f0027e4c618 116 i2c.write(id);
Soyoon 0:9f0027e4c618 117 i2c.write(addr);
Soyoon 0:9f0027e4c618 118 i2c.write(dat);
Soyoon 0:9f0027e4c618 119 i2c.stop();
Soyoon 0:9f0027e4c618 120 }