Microchip Technology dsPIC33F Family Bedienungsanleitung PDF herunterladen (Seite 49)

dsPIC33F

11.1 Math Library

The dsPIC33F Math Library is the compiled version of

the math library that is distributed with the highly

optimized, ANSI-compliant dsPIC33F MPLAB C30 C

Compiler (SW006012). It contains advanced single and

double-precision floating-point arithmetic and

trigonometric functions from the standard ‘C’ header

file (math.h). The library delivers small program code

size and data size, reduced cycles and high accuracy.

Features

• The math library is callable from either MPLAB

C30 or dsPIC33F assembly language.

• The functions are IEEE-754 compliant, with

signed zero, signed infinity, NaN (Not a Number)

and denormal support and operated in the “Round

to Nearest” mode.

• Compatible with MPLAB ASM30 and MPLAB

LINK30, which are available at no charge from

Microchip’s web site.

Table 11-2 shows the memory usage and performance

of the Math Library. Table 11-3 lists the math functions

that are included.

TABLE 11-2: MEMORY USAGE AND

PERFORMANCE

TABLE 11-3: MATH FUNCTIONS

Memory Usage (bytes)

(1,2)

Code size 5250

Data size 4

Performance (cycles)

(1,3)

add 122

sub 124

mul 109

div 361

Rem 385

Sqrt 492

Note 1: Results are based on using dsPIC33F

MPLAB C30 C Compiler (SW006012),

version 1.20.

2: Maximum “Memory Usage” when all

functions in the library are loaded. Most

applications will use less.

3: Average 32-bit floating-point performance

results.

Single and Double-Precision Floating-Point Functions

Arithmetic Functions add, subtract, multiply, divide, remainder

Root and Power Functions pow, sqrt

Trigonometric and Hyperbolic Functions acos, asin, atan, atan2, cos, cosh, sin, sinh, tan, tanh

Logarithmic and Exponential Functions exp, log, log10, frexp, ldexp

Rounding Functions ceil, floor

Absolute Value Functions fabs

Modular Arithmetic Functions fmod, modf

Comparison and Conversions comparison, integer and floating-point conversions

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 89 90

Kommentare zu diesen Handbüchern

Keine Kommentare

Microchip Technology dsPIC33F Family Bedienungsanleitung Seite 49

Kommentare zu diesen Handbüchern