LORDTEK LORDTEK / SP_FP

Single precision floating point conversion converter decoder makes it readable

Dependents:   AMIS30543

SP_FP.cpp@0:f99d1aa55201, 2015-01-20 (annotated)

Committer:
LORDTEK
Date:
Tue Jan 20 14:45:08 2015 +0000
Revision:
0:f99d1aa55201
Single Precision Floating Point converter makes it readable

Who changed what in which revision?

UserRevisionLine numberNew contents of line
LORDTEK 0:f99d1aa55201 1 #include "SP_FP.h"
LORDTEK 0:f99d1aa55201 2 #include "mbed.h"
LORDTEK 0:f99d1aa55201 3
LORDTEK 0:f99d1aa55201 4 SP_FP::SP_FP() {
LORDTEK 0:f99d1aa55201 5 result = 0.0f;
LORDTEK 0:f99d1aa55201 6 value_Temp = 0;
LORDTEK 0:f99d1aa55201 7 }
LORDTEK 0:f99d1aa55201 8
LORDTEK 0:f99d1aa55201 9 float SP_FP::decoder(uint32_t VALUE) {
LORDTEK 0:f99d1aa55201 10 (VALUE >> 31) ? result = -1.0f : result = 1.0f; // Determine sign
LORDTEK 0:f99d1aa55201 11 value_Temp = VALUE << 1; // Delete sign bit
LORDTEK 0:f99d1aa55201 12 value_Temp = value_Temp >> 24; // Make it alone only exponent
LORDTEK 0:f99d1aa55201 13 result *= pow(2.0f, ((float) ((int) value_Temp - 127))); // E (will be pow of 2) = X - 127
LORDTEK 0:f99d1aa55201 14 value_Temp = VALUE << 9; // Delete after 23rd bit
LORDTEK 0:f99d1aa55201 15 value_Temp = value_Temp >> 9; // Make it alone only mantissa (fraction, significand)
LORDTEK 0:f99d1aa55201 16 result *= 1.0f + (float) value_Temp / 8388608.0f; // pow(2.0, 23.0) thanks to http://softelectro.ru
LORDTEK 0:f99d1aa55201 17 return result;
LORDTEK 0:f99d1aa55201 18 }