Hi all:
I've been trying for about a week to write to the DS2406's EPROM using
OWFS. I realize that the bus master needs to have +12 VPP, and have
been working on this.
I currently am trying to write using:
echo "test" > memory
from within my owfs chip's directory. I get an error message from echo.
I have two bus masters: DS9490R (USB) and DS9097E ("passive"). The
9097E has the connecter for +12, which I've put on it. Unfortunately,
it looks like OWFS doesn't see it as the E version, but a version
which does not have +12 which I believe is responsible for it not
allowing me to write.
I have also opened up one of my 9094R's, lifted the VPP pin and
applied +12 externally. Unfortunately, I am still unable to write
through OWFS.
In all my endevors to write so far, the only sucess I've had is to
bring up my 9097E in windows (on a hardware serial port -- I found usb
serial adaptors don't work), and writing one nibble at a time (more
that that fail).
Based on reading the data sheet for the DS2490 (the chip the 9094R is
based on), it sounds like it may require a register or other setting
to be set to enable programming. I looked and looked through owfs and
read every piece of documentation I could find, but could not find any
information on setting the programming enabled info, or even
retreaving information on wether programming voltage is detected.
So, my questions:
1) how do I write to EPROMS requiring the +12VPP?
2) What adaptors have others sucessfully used?
3) Can I configure an adaptor such as the 9094R as write-enabled after
I physically modified it to include +12 VPP? Do I need to?
Any other relevent comments?
Thanks!
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