pyonta cansat / MPL

h

Fork of MPL3115A2 by Michael Lange

Pressure.cpp@4:1a1817c65ca5, 2017-09-11 (annotated)

Committer:
pyonta2017
Date:
Mon Sep 11 10:03:19 2017 +0000
Revision:
4:1a1817c65ca5
Parent:
0:beb43bc3d6d4 
a;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sophtware 0:beb43bc3d6d4 1 #include "Pressure.h"
sophtware 0:beb43bc3d6d4 2 #include "mbed.h"
sophtware 0:beb43bc3d6d4 3
sophtware 0:beb43bc3d6d4 4 Pressure::Pressure()
sophtware 0:beb43bc3d6d4 5 {
sophtware 0:beb43bc3d6d4 6 _pressure = 0.0;
sophtware 0:beb43bc3d6d4 7
sophtware 0:beb43bc3d6d4 8 _compressed[0] = 0;
sophtware 0:beb43bc3d6d4 9 _compressed[1] = 0;
sophtware 0:beb43bc3d6d4 10 _compressed[2] = 0;
sophtware 0:beb43bc3d6d4 11 }
sophtware 0:beb43bc3d6d4 12
sophtware 0:beb43bc3d6d4 13 Pressure::Pressure(float a, unitsType units)
sophtware 0:beb43bc3d6d4 14 {
sophtware 0:beb43bc3d6d4 15 setPressure(a, units);
sophtware 0:beb43bc3d6d4 16 }
sophtware 0:beb43bc3d6d4 17
sophtware 0:beb43bc3d6d4 18 Pressure::Pressure(const char* compressed)
sophtware 0:beb43bc3d6d4 19 {
sophtware 0:beb43bc3d6d4 20 setPressure(compressed);
sophtware 0:beb43bc3d6d4 21 }
sophtware 0:beb43bc3d6d4 22
sophtware 0:beb43bc3d6d4 23 Pressure::Pressure(const char msb, const char csb, const char lsb)
sophtware 0:beb43bc3d6d4 24 {
sophtware 0:beb43bc3d6d4 25 setPressure(msb, csb, lsb);
sophtware 0:beb43bc3d6d4 26 }
sophtware 0:beb43bc3d6d4 27
sophtware 0:beb43bc3d6d4 28 void Pressure::setPressure()
sophtware 0:beb43bc3d6d4 29 {
sophtware 0:beb43bc3d6d4 30 setPressure(_compressed[0], _compressed[1], _compressed[2]);
sophtware 0:beb43bc3d6d4 31 }
sophtware 0:beb43bc3d6d4 32
sophtware 0:beb43bc3d6d4 33 void Pressure::setPressure(float a, unitsType units)
sophtware 0:beb43bc3d6d4 34 {
sophtware 0:beb43bc3d6d4 35 // TODO:
sophtware 0:beb43bc3d6d4 36 }
sophtware 0:beb43bc3d6d4 37
sophtware 0:beb43bc3d6d4 38 void Pressure::setPressure(const char* compressed)
sophtware 0:beb43bc3d6d4 39 {
sophtware 0:beb43bc3d6d4 40 setPressure(compressed[0], compressed[1], compressed[2]);
sophtware 0:beb43bc3d6d4 41 }
sophtware 0:beb43bc3d6d4 42
sophtware 0:beb43bc3d6d4 43 void Pressure::setPressure(const char msb, const char csb, const char lsb)
sophtware 0:beb43bc3d6d4 44 {
sophtware 0:beb43bc3d6d4 45 long pressure_whole = (long)msb<<16 | (long)csb<<8 | (long)lsb;
sophtware 0:beb43bc3d6d4 46 pressure_whole >>= 6; // Pressure is an 18 bit number with 2 bits of decimal. Get rid of decimal portion.
sophtware 0:beb43bc3d6d4 47
sophtware 0:beb43bc3d6d4 48 float pressure_decimal = (float)((lsb&0x30)>>4)/4.0; // Turn it into fraction
sophtware 0:beb43bc3d6d4 49
sophtware 0:beb43bc3d6d4 50 _pressure = (float)pressure_whole + pressure_decimal;
sophtware 0:beb43bc3d6d4 51 }
sophtware 0:beb43bc3d6d4 52
sophtware 0:beb43bc3d6d4 53 float Pressure::pressure(unitsType units)
sophtware 0:beb43bc3d6d4 54 {
sophtware 0:beb43bc3d6d4 55 // http://www.asknumbers.com/
sophtware 0:beb43bc3d6d4 56 switch (units)
sophtware 0:beb43bc3d6d4 57 {
sophtware 0:beb43bc3d6d4 58 case PSI:
sophtware 0:beb43bc3d6d4 59 return _pressure * 0.000145037738;
sophtware 0:beb43bc3d6d4 60 case INHG:
sophtware 0:beb43bc3d6d4 61 return _pressure * 0.00029529983071;
sophtware 0:beb43bc3d6d4 62 case MMHG:
sophtware 0:beb43bc3d6d4 63 return _pressure * 0.007500615613;
sophtware 0:beb43bc3d6d4 64 }
sophtware 0:beb43bc3d6d4 65
sophtware 0:beb43bc3d6d4 66 return _pressure;
sophtware 0:beb43bc3d6d4 67 }
sophtware 0:beb43bc3d6d4 68
sophtware 0:beb43bc3d6d4 69 const char* Pressure::print(unitsType units)
sophtware 0:beb43bc3d6d4 70 {
sophtware 0:beb43bc3d6d4 71 sprintf(_printBuffer, "%.0f", pressure(units));
sophtware 0:beb43bc3d6d4 72 return _printBuffer;
sophtware 0:beb43bc3d6d4 73 }