Talk:Hardware
Barracuda Revisions
The Logik IR100 I own has a Barracuda board marked 'ISSUE D'. It has a number of differences from the board shown in this wiki. The ATMEL chip has been replaced by a PIC12f508. The large chip marked 32C55 is not present (though the pads still exist) and there are a handful of extra resistors/capacitors/empty pads.
I suspect that the PIC/ATMEL chips may hold the serial number and possibly take part in the encryption scheme used to talk to the Reciva server.
I would also be interested to know what HW Version numbers other radios display (from the Configure -> <Version> -> <Hardware> menu). The Logik IR100 show 1012. Rdk 16:55, 8 March 2007 (CET)
Onboard PCM
Is the audio really onboard? The output of dmesg says there is a Wolfson wm8721 on the I2C and IIS buses. Jpr 11:50, 4 May 2007 (CEST)
Atmel/PIC
Is it possible the Atmel/PIC holds the device serial number/handles the crypto associated with the reciva:// protocol? Noodles, 22 July 2007
That's exactly what I believe. The PIC must hold the serial number since I've removed the flash from mine, replaced it with another and I still have the same serial. I suspect the PIC also holds a key - possibly in a similar fashion to a GSM SIM card. A random challenge from the Reciva servers is passed to the PIC, the PIC generates a response and a ciphering key maybe? Of course the PIC could be used to perform all the encryption/decryption itself but that would seem to be an unnecessary bottleneck. --Rdk 19:30, 13 August 2007 (CEST)
Test Points
I replied to Trumpton regarding the pr5/pr6/pr7 testpoints shown on the board outline picture on my internetradiohack blog, but thought I ought to mention it here too.
I was looking to identify which (if any) of the testpoints were for JTAG after removing the S3C2410 processor. At the same time I also checked out the cluster of 3 testpoints labelled pr5, pr6 and pr7 that were hoped to be a serial port. Unfortunately that doesn't seem to be the case they seem to be:
pr5 - L16/UEXTCLK/GPH8
pr6 - J11/EXTCLK
pr7 - J17/nBATT_FLT
Bearing in mind that all the useful flash chip pins appear as testpoints on the board - maybe the nBATT_FLT is used to prevent the processor from powering up and contending the pins used by the flash so that it may be programmed in situ with an external programmer. --Rdk 20:07, 13 August 2007 (CEST)