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I am looking for a free C++ fixed point library (Mainly for use with embedded devices, not for arbitrary precision math). Basically, the requirements are:
Any suggestions?
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Fixed-point math typically takes the form of a larger integer number, for instance 16 bits, where the most significant eight bits are the integer part and the least significant eight bits are the fractional part.
To divide two fixed-point numbers, one takes the integer quotient of their underlying integers, and assumes that the scaling factor is the quotient of their scaling factors. In general, the first division requires rounding and therefore the result is not exact.
A fixed point number just means that there are a fixed number of digits after the decimal point. A floating point number allows for a varying number of digits after the decimal point. For example, if you have a way of storing numbers that requires exactly four digits after the decimal point, then it is fixed point.
To perform fixed-point multiplication, we can first ignore the binary point of the multiplier and multiplicand, perform the multiplication treating the operands as two's complement numbers, and, then, determine the position of the binary point for the result.
There is an open-source fixed point math library project which can be found by following the links below:
It is a C static library with a C++ class interface for C++ users, it implements the following functionality: Trig. Functions: sin, cos, tan, asin, acos, atan, atan2 Saturated Arithmetic: sadd, ssub, smul, sdiv Other Functions: sqrt, exp
It only supports 16.16 fixed-point datatype.
It is an actively developed open-source project (looking for interested developers).
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