Analog Devices AD1847/ADSP-2181 Loopback Example Using Single Index Register for SPORT Autobuffering

About this manual

This document is an Engineer's Note (EE-23) from Analog Devices detailing a loopback example that interfaces the AD1847 SoundPort Codec with an ADSP-2181 DSP. The primary focus is demonstrating how to use a single index register to manage transmitting and receiving data via SPORT autobuffering. The example utilizes the AD1847's 1-wire mode for data transmission and reception across slots 0-5.

What's inside

• AD1847/ADSP-2181 loopback example
• Single index register for SPORT autobuffering
• AD1847 Codec initialization
• ADSP 2181 initialization
• Interrupt service routines
• 1-wire mode configuration
• Talkthru program listing
• Interrupt vector table

Frequently asked questions

What mode is used for the SPORT interface in this example?

The example uses the AD1847's 1-wire mode for transmitting and receiving of data in slots 0-5.

How many index registers are required to run the autobuffer?

The system requires only one index register to run, although two are needed to set it up.