Month: April 2022

With V1.2.20, fp64lib already implements 80 functions and it was time to give the users a little bit more structure on what is available. Therefore, the library references was made consistent in style, a table of contents for the more complex pages were introduced and a new page lists the functions by functional groups (like basic math, trigonometric functions, …). Hope this helps especially new users.

The following functions were added to improve coverage required for full math.h compatibility:

fp64_ilogb, fp64_logb, fp64_exp2, fp64_asinh, fp64_acosh, fp64_atanh, fp64_scalbln, fp64_scalbn

See the library reference for details on these functions.

double on the Arduino Uno is not what you think, double on the Arduino Uno is the same as float, giving you only 6-7 digits of precision! fp64lib was created to implement full 64-bit floating point arithmetic on the AVR MegaAVR architecure microprocessors. Data format is fully compatible with IEEE 754 binary64 standard, providing you 15-17 digits of accuracy.

The library also comes with a math.h compatible header file named “fp64-math.h”. All fp64lib routines start with “fp64_”, e.g. fp64_sin or fp64_add. Library is fully compatible to usual “math.h” routines and includes functions for basic arithmetic, checking and comparing, trigonometry, conversion, logarithms and hyperbelic math. Read more…

Some bugs, especially in fp64_to_string and supporting functions were fixed to support programs >64kB, e.g. on the ATMEGA 2560.