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There's also an [http://www.atmel.com/dyn/resources/prod_documents/doc1006.pdf Atmel Tiny12L MCU] onboard. No idea what it's doing yet.
There's also an [http://www.atmel.com/dyn/resources/prod_documents/doc1006.pdf Atmel Tiny12L MCU] onboard. No idea what it's doing yet.
A guess is that it controls the booting of the main processor. The big processors often have built-in boot loaders that are accessed by setting pins high or low at reset. This can be controlled with links, but using a tiny processor makes more sense. It could for instance invoke the boot loader at start-up and check for a few seconds to see if there is any communication. If there is some, it lets the boot continue. If there is none it resets the processor, set the links to run mode and the starts the processor. This is much easier than opening the box and setting links/switches!


== Flash ==
== Flash ==

Revision as of 19:02, 12 March 2008

Radios

The Barracuda is used in these radios.

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Hardware Matrix

The radios contain slightly different internal hardware architectures, including different LCDs, Keypads and some different pin connections on the Barracuda module. A Hardware Matrix showing the differences, plus datasheets for the hardware has been compiled.

Barracuda hardware

The Barracuda module is a pretty straightforward, but very compact, board with CPU, flash, ram and some interfacing for audio, buttons and LCD display

Front of the PCB
Back of the PCB
Board outline with numbered pins including JTAG
Processor Pin Types
Connector pinout, thanks to rdk
Composite image showing top and bottom layers

The Processor board is marked 'Reciva' and 'IRM2' in the silk screen, and contains (mainly) three devices, all manufactured by Samsung.

The next row of images shows a board outline with pin numbers on the pads. These numbers are by no means official, but until we know the exact purpose of the pins, it's handy to give them a number so everybody is talking about the same thing.

Diagnostics

Diagnostic Captures have been taken to diagnose:

Main CPU

  • The central one is the main processor,

Samsung S3C2410 for which a complete datasheet is available

The processor is running at 202.80MHz (MPLLCON=000a1031)

The CPU has the following on-board functions:

  • ARM920T core
  • PCM Sound device
  • USB host/device interface
  • TFT LCD/STN LCD Controller (16bit, 640x480 maximum)
  • JTAG Port (is TRST Open Drain or Push Pull?)
  • ...

Smally Tiny12 CPU

There's also an Atmel Tiny12L MCU onboard. No idea what it's doing yet.

A guess is that it controls the booting of the main processor. The big processors often have built-in boot loaders that are accessed by setting pins high or low at reset. This can be controlled with links, but using a tiny processor makes more sense. It could for instance invoke the boot loader at start-up and check for a few seconds to see if there is any communication. If there is some, it lets the boot continue. If there is none it resets the processor, set the links to run mode and the starts the processor. This is much easier than opening the box and setting links/switches!

Flash

RAM

Schematic

This schematic (work in progress) is an amalgumation of information extracted from several disassembled radios, plus information extracted from the GPL'd source.

Source Data

Source files (schematic, drawings, etc...) can be found on the Source Files page.