Diff: SP_FP.cpp

Revision:

0:f99d1aa55201

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SP_FP.cpp	Tue Jan 20 14:45:08 2015 +0000
@@ -0,0 +1,18 @@
+#include "SP_FP.h"
+#include "mbed.h"
+
+SP_FP::SP_FP() {
+    result = 0.0f;
+    value_Temp = 0;
+}
+
+float SP_FP::decoder(uint32_t VALUE) {
+    (VALUE >> 31) ? result = -1.0f : result = 1.0f;  // Determine sign
+    value_Temp = VALUE << 1;  // Delete sign bit
+    value_Temp = value_Temp >> 24;  // Make it alone only exponent
+    result *= pow(2.0f, ((float) ((int) value_Temp - 127)));  // E (will be pow of 2) = X - 127
+    value_Temp = VALUE << 9;  // Delete after 23rd bit
+    value_Temp = value_Temp >> 9;  // Make it alone only mantissa (fraction, significand)
+    result *= 1.0f + (float) value_Temp / 8388608.0f;  // pow(2.0, 23.0) thanks to http://softelectro.ru
+    return result;
+}
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