HWA REAL FFT

Table of Contents

• Introduction
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

This example performs HWA based FFT and IFFT operation on real input data.

The input to the FFT is a sinusoidal real (float) data. This is converted to 24-bit signed fixed point data which the HWA will operate on. The HWA PaRAM sets are initialized with proper configuration for FFT and IFFT operation. The HWA is triggered to perform the FFT operation and the frequency domain complex output is converted back to float just to show that user can tap this data for further processing. In the IFFT part, the frequency domain complex data is converted back to fixed point and provided to HWA to perform the IFFT operation. Once the conversion is completed, the data is converted back to float. The output is then compared to the input data and SNR is calculated and printed on the console.

The example also demonstrates multi-pass dynamic scaling FFT operation which improves the SNR ratio compared to the single-pass conservative scaling FFT operation.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
	c66ss0 nortos
Toolchain	ti-arm-clang, ti-c6000
Board	am273x-evm
Example folder	examples/drivers/hwa/hwa_real_fft

Steps to Run the Example

• When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
• Launch a CCS debug session and run the executable, see CCS Launch, Load and Run

See Also

HWA

Sample Output

Shown below is a sample output when the application is run,