Analog Devices Blackfin Processor Boot Compression/Decompression Algorithm Application Note

This document describes a boot compression/decompression algorithm for ADSP-BF533 and ADSP-BF561 Blackfin® processors. The code included with this document was verified using the VisualDSP++® 3.5 tools suite for Blackfin processors. The project was run on an EZ-KIT Lite® evaluation system for ADSP-BF533 Blackfin processors (ADDS-BF533-EZLITE, Rev 1.2) and on an EZ-KIT Lite evaluation system for ADSP-BF561 Blackfin processors.

Brand: Analog Devices
Category: Other Electronics
Document type: Application Note
Language: English
Pages: 7
File format: PDF
File size: 178 KB
Published: 03 August, 2012
Updated: 28 September, 2023
Models: ADSP-BF561, ADSP-BF533
MD5 checksum: 09D07E40B34C9ED930CD1C9A5956030D
PDF: Analog Devices Blackfin Processor Boot Compression/Decompression Algorithm Application Note PDF

About this manual

The document details an open-source compression algorithm based on Zlib designed to reduce the size of loader files stored in non-volatile memory for ADSP-BF533 and ADSP-BF561 Blackfin processors. It explains that this method is particularly useful for large projects requiring significant flash savings, though it requires approximately 50 KB of overhead memory.

What's inside

Introduction
Boot Compression/Decompression Algorithm
Step 1: Allocate SDRAM Memory
Step 2: Set UNCOMPR_ADDR Field
Step 3: Specify User-Application Project
Step 4: Build Init Code and Application
Step 5: Edit compress.bat File
Step 6: Execute Compression Script
Step 7: Convert to Intel Hexadecimal Format

Frequently asked questions

What compression library is used for the algorithm?

The compression/decompression functions are handled by a simple open-source compression library called Zlib.

How much overhead memory does the algorithm require?

This compression algorithm requires about 50 KB of overhead (extra) memory.

Where should the compressed loader file be copied for flashing?

The CompressedApp.ldr file must be copied to the root folder before executing IntelHex.bat.

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