| CMSIS-DSP Version 1.4.4 CMSIS DSP Software Library

- CMSIS
- CORE
- Driver
- DSP
- RTOS API
- Pack
- SVD

- Main Page
- Usage and Description
- Reference

All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
CMSIS DSP Software Library

## Introduction

This user manual describes the CMSIS DSP software library, a suite of common signal processing functions for use on Cortex-M processor based devices.

The library is divided into a number of functions each covering a specific category:

- Basic math functions
- Fast math functions
- Complex math functions
- Filters
- Matrix functions
- Transforms
- Motor control functions
- Statistical functions
- Support functions
- Interpolation functions

The library has separate functions for operating on 8-bit integers, 16-bit integers, 32-bit integer and 32-bit floating-point values.

## Using the Library

The library installer contains prebuilt versions of the libraries in the `Lib` folder.

- arm_cortexM7lfdp_math.lib (Little endian and Double Precision Floating Point Unit on Cortex-M7)
- arm_cortexM7bfdp_math.lib (Big endian and Double Precision Floating Point Unit on Cortex-M7)
- arm_cortexM7lfsp_math.lib (Little endian and Single Precision Floating Point Unit on Cortex-M7)
- arm_cortexM7bfsp_math.lib (Big endian and Single Precision Floating Point Unit on Cortex-M7)
- arm_cortexM7l_math.lib (Little endian on Cortex-M7)
- arm_cortexM7b_math.lib (Big endian on Cortex-M7)
- arm_cortexM4lf_math.lib (Little endian and Floating Point Unit on Cortex-M4)
- arm_cortexM4bf_math.lib (Big endian and Floating Point Unit on Cortex-M4)
- arm_cortexM4l_math.lib (Little endian on Cortex-M4)
- arm_cortexM4b_math.lib (Big endian on Cortex-M4)
- arm_cortexM3l_math.lib (Little endian on Cortex-M3)
- arm_cortexM3b_math.lib (Big endian on Cortex-M3)
- arm_cortexM0l_math.lib (Little endian on Cortex-M0 / CortexM0+)
- arm_cortexM0b_math.lib (Big endian on Cortex-M0 / CortexM0+)

The library functions are declared in the public file `arm_math.h` which is placed in the `Include` folder. Simply include this file and link the appropriate library in the application and begin calling the library functions. The Library supports single public header file `arm_math.h` for Cortex-M7/M4/M3/M0/M0+ with little endian and big endian. Same header file will be used for floating point unit(FPU) variants. Define the appropriate pre processor MACRO ARM_MATH_CM7 or ARM_MATH_CM4 or ARM_MATH_CM3 or ARM_MATH_CM0 or ARM_MATH_CM0PLUS depending on the target processor in the application.

## Examples

The library ships with a number of examples which demonstrate how to use the library functions.

## Toolchain Support

The library has been developed and tested with MDK-ARM version 4.60. The library is being tested in GCC and IAR toolchains and updates on this activity will be made available shortly.

## Building the Library

The library installer contains a project file to re build libraries on MDK-ARM Tool chain in the `CMSIS\DSP_Lib\Source\ARM` folder.

- arm_cortexM_math.uvproj

The libraries can be built by opening the arm_cortexM_math.uvproj project in MDK-ARM, selecting a specific target, and defining the optional pre processor MACROs detailed above.

## Pre-processor Macros

Each library project have differant pre-processor macros.

- UNALIGNED_SUPPORT_DISABLE:

Define macro UNALIGNED_SUPPORT_DISABLE, If the silicon does not support unaligned memory access

- ARM_MATH_BIG_ENDIAN:

Define macro ARM_MATH_BIG_ENDIAN to build the library for big endian targets. By default library builds for little endian targets.

- ARM_MATH_MATRIX_CHECK:

Define macro ARM_MATH_MATRIX_CHECK for checking on the input and output sizes of matrices

- ARM_MATH_ROUNDING:

Define macro ARM_MATH_ROUNDING for rounding on support functions

- ARM_MATH_CMx:

Define macro ARM_MATH_CM4 for building the library on Cortex-M4 target, ARM_MATH_CM3 for building library on Cortex-M3 target and ARM_MATH_CM0 for building library on cortex-M0 target, ARM_MATH_CM0PLUS for building library on cortex-M0+ target.

- __FPU_PRESENT:

Initialize macro __FPU_PRESENT = 1 when building on FPU supported Targets. Enable this macro for M4bf and M4lf libraries

## CMSIS-DSP in ARM::CMSIS Pack

The following files relevant to CMSIS-DSP are present in the ARM::CMSIS Pack directories:

File/Folder | Content
--- | ---
CMSIS\Documentation\DSP | This documentation
CMSIS\DSP_Lib | Software license agreement (license.txt)
CMSIS\DSP_Lib\Examples | Example projects demonstrating the usage of the library functions
CMSIS\DSP_Lib\Source | Source files for rebuilding the library

## Revision History of CMSIS-DSP

Please refer to Change Log.

## Copyright Notice

Copyright (C) 2010-2014 ARM Limited. All rights reserved.