Steve Beaver
October 31st 03, 03:03 PM
Just a guess but EEPROM can be very slow indeed. Depending on the exact part
number, it may not even be possible to change a single location in the chip.
This means that you have to read the entire contents (or a large part) of
the chip, change the value you need to update and then write it all back
again. This is a real pain and can take several seconds to complete.
I would suggest you wait about a minute before turning off the device so
that it has time to go through this procedure.
Most programmer will display some thing like "Updating . . " while the
update is in progress and the "Done" when complete so that you know what is
going on.
Steve
"Peter" > wrote in message
...
> Hi,
>
> I've had a Shadin Microflo for a year and a half, and it has what
> looks like a hardware or software bug: after setting a new FOB figure,
> waiting for it to save it, turning off power, turning power back on,
> it has lost the new FOB setting and has reverted to the original FOB
> setting which was there before I started to change it.
>
> There is a strong correlation between how long the unit has been ON
> (or OFF) since the FOB was set, and losing the data: the longer one
> waits, the less likely it is to get lost.
>
> I have now had FOUR of these changed (under warranty) and they all do
> it. Sometimes one has to set the FOB (at fill-up time) ten times or
> more before it "sticks" in the memory.
>
> Shadin always respond with a standard reply asking for serial number
> and other into and don't acknowledge any knowledge of this. They have
> however confirmed that there is no battery which might go flat, so I
> assume it is an EEPROM/FLASH, in which case (I have designed lots of
> electronic products) it would appear a pretty serious "feature".
>
> Has anyone else seen this?
>
>
> Peter.
> --
> Return address is invalid to help stop junk mail.
> E-mail replies to but remove the X and the Y.
> Please do NOT copy usenet posts to email - it is NOT necessary.
number, it may not even be possible to change a single location in the chip.
This means that you have to read the entire contents (or a large part) of
the chip, change the value you need to update and then write it all back
again. This is a real pain and can take several seconds to complete.
I would suggest you wait about a minute before turning off the device so
that it has time to go through this procedure.
Most programmer will display some thing like "Updating . . " while the
update is in progress and the "Done" when complete so that you know what is
going on.
Steve
"Peter" > wrote in message
...
> Hi,
>
> I've had a Shadin Microflo for a year and a half, and it has what
> looks like a hardware or software bug: after setting a new FOB figure,
> waiting for it to save it, turning off power, turning power back on,
> it has lost the new FOB setting and has reverted to the original FOB
> setting which was there before I started to change it.
>
> There is a strong correlation between how long the unit has been ON
> (or OFF) since the FOB was set, and losing the data: the longer one
> waits, the less likely it is to get lost.
>
> I have now had FOUR of these changed (under warranty) and they all do
> it. Sometimes one has to set the FOB (at fill-up time) ten times or
> more before it "sticks" in the memory.
>
> Shadin always respond with a standard reply asking for serial number
> and other into and don't acknowledge any knowledge of this. They have
> however confirmed that there is no battery which might go flat, so I
> assume it is an EEPROM/FLASH, in which case (I have designed lots of
> electronic products) it would appear a pretty serious "feature".
>
> Has anyone else seen this?
>
>
> Peter.
> --
> Return address is invalid to help stop junk mail.
> E-mail replies to but remove the X and the Y.
> Please do NOT copy usenet posts to email - it is NOT necessary.