Summary

Microchip’s ANSI C compiler provides full floating point math capability, enabling both the single and double precision floating point operations found in any standard ANSI C compiler. These include functions such as sin, cos, tan, and other common mathematical operations.

Description
The standard ANSI C floating point library is part of the MPLAB compiler and is documented in the 16-bit Language Tools document. The library works with both the PIC24and dsPIC families.

Features
• Free library included with MPLAB compiler

• Compatible with the Microchip PIC24and dsPIC families
• Full compatibility with standard ANSI C floating point math libraries.

• Support for double or single precision floating point

• Includes common operations such as sin, cos, tan, etc.

Devices Supported
All processors in the PIC24and dsPIC DSC family

Getting Started
• Download and install MPLAB and the free trial version of the C compiler

• See Chapter 3 of the 16-bit Language Tools for complete documentation of the Floating Point Math Library

• Start writing floating point code!

Common Floating Point Math Functions

Function

Description

sin/sinf*

Sin of a double/single precision floating point variable

cos/cosf*

Cos of a double/single precision floating point variable

tan/tanf*

Tan of a double/single precision floating point variable

exp/expf*

Calculates the exponential function of a double/single precision floating point variable

fabs/fabsf*

Calculates the absolute value of a double/single precision floating point variable

fmod/fmodf*

Calculates the remainder of x/y as a double/single precision floating point value

log/logf*

Calculates the log of a double/single precision variable

sqrt/sqrtf*

Calculates the square root of a double/single precision variable

pow/powf*

Calculates x raised to the power of y

floor/floorf*

Calculates the floor of a double/single precision floating point variable

ceil/ceilf*

Calculates the ceiling of a double/single precision floating point variable

asin/asinf*

Arc sin of a double/single precision floating point variable

acos/acosf*

Arc cos of a double/single precision floating point variable

atan/atanf*

Arc tan of a double/single precision floating point variable

*- “f” denotes single precision floating point number

A complete list of floating point math functions is available in the 16-Bit Language Tools document