On 02/01/2013 06:22 AM, Uwe Bonnes wrote:
Anders> When experimenting with an FT245R I found that bit 0 is the
Anders> culprit - when cleared, an FT245R is turned into an FT232R (or
Anders> so it seems). If you turn the bit back on, the functionality of
Anders> the FT245R is restored.
Anders> Unfortunately, there is no way (that I know of) to detect if a
Anders> chip is really an FT232R or an FT245R other than checking bit 0
Anders> of byte 0.
So libftdi has to carefully preserve bit 0 and should provide a user
override to change that value. The override is needed, when something went
wrong before.
I think this would be a good addition.
I tested with MProg to check the byte 0 bit mapping. By the way, MProg
works well in an XP virtual machine under Linux.
FT245R eeprom bits 2 & 3 of byte 0 are as follows:
bit 2 -- High-current I/O
bit 3 -- Load D2XX driver (VCP)
MProg refused to change the part to a FT232R so I couldn't test bit 0
with it. I didn't find any way in MProg to change the other bits.
Karl
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