Re: [Uisp-dev] usb-parallel port adapter unit with uisp in linux?

[Wojtek Kaniewski]

Theodore A. Roth wrote:
> USB to serial adapters work in most cases. The cases that don't work are
> the DASA and DAPA type programmer dongles. You loose control of the
> individual pin levels when using USB adaptors (both serial and
> parallel). There might be some USB-to-rs232 or parallel dongles that can
> give you pin level control, but I haven't seen any (note: my USB
> experience is very limited).

almost every serial adapter lets you control DTR and RTS, but none of 
drivers in Linux 2.4 handles break on TXD, which leaves us with 2 
signals. and as DASA2 sets RST with break, i think that the pressing the 
reset switch in the target device before running uisp should do the trick.

besides, i've found only one parallel adapter in Linux source tree and 
it seems that it handles properly all required parport ioctls -- writing 
data and control port, reading status port.

disclaimer: i don't own any serial or paralle USB adapters, so this is 
just theory based on Linux source code review.

regards,
wojtek