Overview
Description
The FFT Library is a computational library for Renesas MCUs.
FFT (Fast Fourier Transform) is a fast algorithm for implementing discrete Fourier transform. This FFT library also uses assembler tuning to realize highly efficient processing for Renesas MCUs.The FFT enables the user to measure the frequency characteristics of the input data. For example, by executing the FFT on voice data, you can measure the amplitude (volume) of each frequency that comprises the sound.
Components
- FFT Library
- Sample Program
- User's Manual
Features
- High-speed processing with assembler tuning
- Memory savings
- Simple APIs
- Excellent development efficiency when paired with Renesas tools
- Application Examples: power spectrum analysis, sensor data analysis, noise analysis
- [Learn More]
Release Information
RL78
Latest Ver.: V.1.00 Release 01
Released: May 20, 2014
Details of upgrade (See Tool News)
Operating Environment
How to Obtain
Provide Conditions
Target Devices
Documentation
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| Type | Title | Date |
| Application Note | PDF 1.01 MB 日本語 | |
| Application Note | PDF 447 KB 日本語 | |
| Tool News - Release | PDF 477 KB 日本語 | |
| Tool News - Release | PDF 316 KB 日本語 | |
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Design & Development
Additional Details
Application Examples
power spectrum analysis, sensor data analysis, noise analysis
Functions
The following list shows the functions supported by the FFT library and processing times when operating an RX600 Series MCU at 100MHz.
| Function | Processing Time | |||
|---|---|---|---|---|
| Function Name | Actual number / Complex number | No. of points | No. of cycles (cycles) | Actual time (µsec) |
| R_cfft16 | Complex number | 16 | 994 | 9.94 |
| R_cfft32 | Complex number | 32 | 3597 | 35.97 |
| R_cfft64 | Complex number | 64 | 6928 | 69.28 |
| R_rfft128 | Actual number | 128 | 12695 | 126.95 |
| R_rfft256 | Actual number | 256 | 28826 | 288.26 |
| R_rfft512 | Actual number | 512 | 63588 | 635.88 |
| R_rfft1024 | Actual number | 1024 | 141038 | 1410.38 |
Operating Environment
Renesas offers the following evaluation environments to ensure immediate use of the FFT library.
| Target MCU | Evaluation Environment | Debugger |
|---|---|---|
| RL78 Family | Integrated development environment CS+ | Simulator for CS+ of RL78 Family, 78K0R and 78K0 |
| IAR Embedded Workbench for Renesas RL78 Note1 | IAR C-SPY Debugger for RL78 |
Note1: by IAR Systems
How to Obtain
Download: RL78 Family FFT Library: Deployment Guide Rev.1.08 - Sample Code (ZIP)
Provide Conditions
- Evaluation Version
- We provide the evaluation version as a sample code for customers adopting Renesas microcontrollers. You can download the sample code from RL78 Family FFT Library: Deployment Guide Rev.1.08 - Sample Code (ZIP). In addition, we do not offer any technical supports for the evaluation version. Please use it with reference to the attached user's manual to the sample code.
- Commercial version
- This item is not available in the Commercial version.
Target Devices
RL78 Family Note1
Note1: Only the evaluation versions available.
The DSP Library includes a function of FFT Library for RX600 Series. The evaluation version of FFT Library for RL78 Family can be downloaded from RL78 Family FFT Library: Deployment Guide Rev.1.08 - Sample Code (ZIP)