Soyoon Kim / Mbed 2 deprecated mbed_Barometer

test

Dependencies:   mbed

Barometer.cpp@1:b6a29c7aeaa9, 2016-08-19 (annotated)

Committer:
Soyoon
Date:
Fri Aug 19 07:56:26 2016 +0000
Revision:
1:b6a29c7aeaa9
Parent:
0:f6f6f699ab24 
deliver;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Soyoon 0:f6f6f699ab24 1 #include "mbed.h"
Soyoon 0:f6f6f699ab24 2 #include "Barometer.h"
Soyoon 0:f6f6f699ab24 3
Soyoon 0:f6f6f699ab24 4 #define WEATHER_Barometer 0xee
Soyoon 0:f6f6f699ab24 5 #define xpow(x, y) ((long)1 << y)
Soyoon 0:f6f6f699ab24 6
Soyoon 0:f6f6f699ab24 7
Soyoon 0:f6f6f699ab24 8 Barometer::Barometer (PinName p_sda, PinName p_scl, Barometer_oss p_oss) : i2c(p_sda, p_scl) {
Soyoon 0:f6f6f699ab24 9 init(p_oss);
Soyoon 0:f6f6f699ab24 10 }
Soyoon 0:f6f6f699ab24 11
Soyoon 0:f6f6f699ab24 12 Barometer::Barometer (I2C& p_i2c, Barometer_oss p_oss) : i2c(p_i2c) {
Soyoon 0:f6f6f699ab24 13 init(p_oss);
Soyoon 0:f6f6f699ab24 14 }
Soyoon 0:f6f6f699ab24 15
Soyoon 0:f6f6f699ab24 16
Soyoon 0:f6f6f699ab24 17 float Barometer::get_temperature() {
Soyoon 0:f6f6f699ab24 18 return temperature;
Soyoon 0:f6f6f699ab24 19 }
Soyoon 0:f6f6f699ab24 20
Soyoon 0:f6f6f699ab24 21 float Barometer::get_pressure() {
Soyoon 0:f6f6f699ab24 22 return pressure;
Soyoon 0:f6f6f699ab24 23 }
Soyoon 0:f6f6f699ab24 24
Soyoon 1:b6a29c7aeaa9 25 float Barometer::get_altitude_m() {
Soyoon 1:b6a29c7aeaa9 26 altitude = 44330*(1-pow((pressure/1013.25),(0.190295)));
Soyoon 1:b6a29c7aeaa9 27 return altitude;
Soyoon 1:b6a29c7aeaa9 28 }
Soyoon 1:b6a29c7aeaa9 29
Soyoon 0:f6f6f699ab24 30 void Barometer::update () {
Soyoon 0:f6f6f699ab24 31 long t, p, ut, up, x1, x2, x3, b3, b5, b6;
Soyoon 0:f6f6f699ab24 32 unsigned long b4, b7;
Soyoon 0:f6f6f699ab24 33
Soyoon 0:f6f6f699ab24 34 twi_writechar(WEATHER_Barometer, 0xf4, 0x2e);
Soyoon 0:f6f6f699ab24 35 wait(0.01);
Soyoon 0:f6f6f699ab24 36 ut = twi_readshort(WEATHER_Barometer, 0xf6);
Soyoon 0:f6f6f699ab24 37
Soyoon 0:f6f6f699ab24 38 twi_writechar(WEATHER_Barometer, 0xf4, 0x34 | (oss << 6));
Soyoon 0:f6f6f699ab24 39 wait(0.05);
Soyoon 0:f6f6f699ab24 40 up = twi_readlong(WEATHER_Barometer, 0xf6) >> (8 - oss);
Soyoon 0:f6f6f699ab24 41
Soyoon 0:f6f6f699ab24 42 x1 = (ut - ac6) * ac5 / xpow(2, 15);
Soyoon 0:f6f6f699ab24 43 x2 = (long)mc * xpow(2, 11) / (x1 + md);
Soyoon 0:f6f6f699ab24 44 b5 = x1 + x2;
Soyoon 0:f6f6f699ab24 45 t = (b5 + 8) / xpow(2, 4);
Soyoon 0:f6f6f699ab24 46 temperature = (float)t / 10.0;
Soyoon 0:f6f6f699ab24 47
Soyoon 0:f6f6f699ab24 48 b6 = b5 - 4000;
Soyoon 0:f6f6f699ab24 49 x1 = (b2 * (b6 * b6 / xpow(2, 12))) / xpow(2, 11);
Soyoon 0:f6f6f699ab24 50 x2 = ac2 * b6 / xpow(2, 11);
Soyoon 0:f6f6f699ab24 51 x3 = x1 + x2;
Soyoon 0:f6f6f699ab24 52 b3 = ((((unsigned long)ac1 * 4 + x3) << oss) + 2) / 4;
Soyoon 0:f6f6f699ab24 53 x1 = ac3 * b6 / xpow(2, 13);
Soyoon 0:f6f6f699ab24 54 x2 = (b1 * (b6 * b6 / xpow(2, 12))) / xpow(2, 16);
Soyoon 0:f6f6f699ab24 55 x3 = ((x1 + x2) + 2) / xpow(2, 2);
Soyoon 0:f6f6f699ab24 56 b4 = ac4 * (unsigned long)(x3 + 32768) / xpow(2, 15);
Soyoon 0:f6f6f699ab24 57 b7 = ((unsigned long)up - b3) * (50000 >> oss);
Soyoon 0:f6f6f699ab24 58 if (b7 < (unsigned long)0x80000000) {
Soyoon 0:f6f6f699ab24 59 p = (b7 * 2) / b4;
Soyoon 0:f6f6f699ab24 60 } else {
Soyoon 0:f6f6f699ab24 61 p = (b7 / b4) * 2;
Soyoon 0:f6f6f699ab24 62 }
Soyoon 0:f6f6f699ab24 63 x1 = (p / xpow(2, 8)) * (p / xpow(2, 8));
Soyoon 0:f6f6f699ab24 64 x1 = (x1 * 3038) / xpow(2, 16);
Soyoon 0:f6f6f699ab24 65 x2 = (-7357 * p) / xpow(2, 16);
Soyoon 0:f6f6f699ab24 66 p = p + (x1 + x2 + 3791) / xpow(2, 4);
Soyoon 0:f6f6f699ab24 67 pressure = (float)p / 100.0;
Soyoon 0:f6f6f699ab24 68 }
Soyoon 0:f6f6f699ab24 69
Soyoon 0:f6f6f699ab24 70 void Barometer::init (Barometer_oss p_oss) {
Soyoon 0:f6f6f699ab24 71 ac1 = twi_readshort(WEATHER_Barometer, 0xaa);
Soyoon 0:f6f6f699ab24 72 ac2 = twi_readshort(WEATHER_Barometer, 0xac);
Soyoon 0:f6f6f699ab24 73 ac3 = twi_readshort(WEATHER_Barometer, 0xae);
Soyoon 0:f6f6f699ab24 74 ac4 = twi_readshort(WEATHER_Barometer, 0xb0);
Soyoon 0:f6f6f699ab24 75 ac5 = twi_readshort(WEATHER_Barometer, 0xb2);
Soyoon 0:f6f6f699ab24 76 ac6 = twi_readshort(WEATHER_Barometer, 0xb4);
Soyoon 0:f6f6f699ab24 77 b1 = twi_readshort(WEATHER_Barometer, 0xb6);
Soyoon 0:f6f6f699ab24 78 b2 = twi_readshort(WEATHER_Barometer, 0xb8);
Soyoon 0:f6f6f699ab24 79 mb = twi_readshort(WEATHER_Barometer, 0xba);
Soyoon 0:f6f6f699ab24 80 mc = twi_readshort(WEATHER_Barometer, 0xbc);
Soyoon 0:f6f6f699ab24 81 md = twi_readshort(WEATHER_Barometer, 0xbe);
Soyoon 0:f6f6f699ab24 82 oss = p_oss;
Soyoon 0:f6f6f699ab24 83 }
Soyoon 0:f6f6f699ab24 84
Soyoon 0:f6f6f699ab24 85 unsigned short Barometer::twi_readshort (int id, int addr) {
Soyoon 0:f6f6f699ab24 86 unsigned short i;
Soyoon 0:f6f6f699ab24 87
Soyoon 0:f6f6f699ab24 88 i2c.start();
Soyoon 0:f6f6f699ab24 89 i2c.write(id);
Soyoon 0:f6f6f699ab24 90 i2c.write(addr);
Soyoon 0:f6f6f699ab24 91
Soyoon 0:f6f6f699ab24 92 i2c.start();
Soyoon 0:f6f6f699ab24 93 i2c.write(id | 1);
Soyoon 0:f6f6f699ab24 94 i = i2c.read(1) << 8;
Soyoon 0:f6f6f699ab24 95 i |= i2c.read(0);
Soyoon 0:f6f6f699ab24 96 i2c.stop();
Soyoon 0:f6f6f699ab24 97
Soyoon 0:f6f6f699ab24 98 return i;
Soyoon 0:f6f6f699ab24 99 }
Soyoon 0:f6f6f699ab24 100
Soyoon 0:f6f6f699ab24 101 unsigned long Barometer::twi_readlong (int id, int addr) {
Soyoon 0:f6f6f699ab24 102 unsigned long i;
Soyoon 0:f6f6f699ab24 103
Soyoon 0:f6f6f699ab24 104 i2c.start();
Soyoon 0:f6f6f699ab24 105 i2c.write(id);
Soyoon 0:f6f6f699ab24 106 i2c.write(addr);
Soyoon 0:f6f6f699ab24 107
Soyoon 0:f6f6f699ab24 108 i2c.start();
Soyoon 0:f6f6f699ab24 109 i2c.write(id | 1);
Soyoon 0:f6f6f699ab24 110 i = i2c.read(1) << 16;
Soyoon 0:f6f6f699ab24 111 i |= i2c.read(1) << 8;
Soyoon 0:f6f6f699ab24 112 i |= i2c.read(0);
Soyoon 0:f6f6f699ab24 113 i2c.stop();
Soyoon 0:f6f6f699ab24 114
Soyoon 0:f6f6f699ab24 115 return i;
Soyoon 0:f6f6f699ab24 116 }
Soyoon 0:f6f6f699ab24 117
Soyoon 0:f6f6f699ab24 118 void Barometer::twi_writechar (int id, int addr, int dat) {
Soyoon 0:f6f6f699ab24 119
Soyoon 0:f6f6f699ab24 120 i2c.start();
Soyoon 0:f6f6f699ab24 121 i2c.write(id);
Soyoon 0:f6f6f699ab24 122 i2c.write(addr);
Soyoon 0:f6f6f699ab24 123 i2c.write(dat);
Soyoon 0:f6f6f699ab24 124 i2c.stop();
Soyoon 0:f6f6f699ab24 125 }