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Franc Zabkar Franc Zabkar is offline
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Default Followup USB malfunction ? / Ezbus digital mixer /Ez-usb USB chip

On Sat, 22 May 2010 07:49:28 +0100, "N_Cook" put
finger to keyboard and composed:

Switching SDA line after 3 seconds still keeps the USB open but wrong
identity for the mixer firmware installer. Not had a chance to connect it up
to a pc but I'm assuming it will not software connect if expecting the mixer
VID/VID/endpoint. When next I have some time I will load the installer.exe
into hex_reader_XVI32 and see if I can swap VID / PID hex-codes to fool it
into thinking it is an EZbus rather than EZusb it is hooked to. Probably
checksummed there but simple enough to try.


You may be interested in IICUNI. It is a utility that controls I2C
devices from a PC parallel port. I suspect that you could program the
serial EEPROM in-circuit if you keep the EZ-USB chip quiet by holding
down its reset pin.

http://web.archive.org/web/200605110...ogs/iicuni.rar

I believe the EZ-USB datasheet should tell you how to compute the
checksum.

- Franc Zabkar
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