GY-63_MS5611/libraries/float16/examples/float16_test0/float16_test0.ino
2021-12-18 14:15:24 +01:00

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//
// FILE: float16_test0.ino
// AUTHOR: Rob Tillaart
// PURPOSE: test float16
// DATE: 2015-03-11
// URL: https://github.com/RobTillaart/float16
//
/*
SIGN EXP MANTISSA
0 01111 0000000000 = 1
0 01111 0000000001 = 1 + 210 = 1.0009765625 (next smallest float after 1)
1 10000 0000000000 = 2
0 11110 1111111111 = 65504 (max half precision)
0 00001 0000000000 = 214 ≈ 6.10352 × 105 (minimum positive normal)
0 00000 1111111111 = 214 - 224 ≈ 6.09756 × 105 (maximum subnormal)
0 00000 0000000001 = 224 ≈ 5.96046 × 108 (minimum positive subnormal)
0 00000 0000000000 = 0
1 00000 0000000000 = 0
0 11111 0000000000 = infinity
1 11111 0000000000 = infinity
0 01101 0101010101 = 0.333251953125 ≈ 1/3
*/
#include "float16.h"
void setup()
{
while(!Serial);
Serial.begin(115200);
Serial.println(__FILE__);
Serial.print("FLOAT16_LIB_VERSION: ");
Serial.println(FLOAT16_LIB_VERSION);
Serial.println("\nStart ");
Serial.println();
test_constructors();
test_numbers();
test_binary();
test_toDouble();
Serial.println("\ndone...");
}
void loop()
{
}
void test_constructors()
{
Serial.println("\ntest_constructors:");
float16 a;
Serial.println(a.toDouble(), 9);
Serial.println(a.getBinary(), HEX);
float16 b = 6;
Serial.println(b.toDouble(), 9);
Serial.println(b.getBinary(), HEX);
float16 e(EULER);
Serial.println(e.toDouble(), 9);
Serial.println(e.getBinary(), HEX);
float16 f(e);
Serial.println(f.toDouble(), 9);
Serial.println(f.getBinary(), HEX);
f = 1.61803398875; // golden ratio
Serial.println(f.toDouble(), 9);
Serial.println(f.getBinary(), HEX);
Serial.println();
}
void test_toDouble()
{
Serial.println("\ntest_toDouble:");
float16 f(3.1415);
Serial.println(f.toDouble(), 9); // 3.14
f.setBinary(0x0000);
Serial.println(f.toDouble(), 9); // 0
f.setBinary(0xFC00);
Serial.println(f.toDouble(), 9); //-inf
f.setBinary(0x7C00);
Serial.println(f.toDouble(), 9); // inf
f.setBinary(0x3C00);
Serial.println(f.toDouble(), 9); // 1
f.setBinary(0x3C01);
Serial.println(f.toDouble(), 9); // 1.0009765625
f.setBinary(0x3555);
Serial.println(f.toDouble(), 9); // 0.333333
Serial.println();
}
void test_binary()
{
Serial.println("\ntest_binary:");
float16 e(3.1415);
float16 f(0);
Serial.println(e.toDouble(), 9);
f.setBinary(e.getBinary());
Serial.println(f.toDouble(), 9);
Serial.println();
}
void test_numbers()
{
Serial.println("\ntest_numbers:");
Serial.println("** ZERO **");
float16 a(0);
Serial.println(a.toDouble(), 9);
Serial.println("** SUBNORMAL **");
float16 b(1 / 1000.0);
Serial.println(b.toDouble(), 9);
Serial.println("** NORMAL **");
float16 c(1 / 2000.0);
Serial.println(c.toDouble(), 9);
c = 1/3.0;
Serial.println(c.toDouble(), 9);
float16 d(1);
Serial.println(d.toDouble(), 9);
float16 e(PI);
Serial.println(e.toDouble(), 9);
Serial.println("** OVERFLOW **");
float16 f(1000000.0);
Serial.println(f.toDouble(), 9);
Serial.println("** UNDERFLOW **");
float16 g(1 / 1000000.0);
Serial.println(g.toDouble(), 9);
Serial.println();
}
// -- END OF FILE --