Re: command line

Andrew Zabolotny wrote:

>On Mon, 23 Feb 2004 20:42:39 +0100
>alain2210@free.fr wrote:
>
>
>
>>finally after a lot of trial, I found that for beeing able to write on
>>the command line the GPIO24_Level must be 1....
>>
>>
>Ok, I've updated h2200.c to always power-on the RS-232 transceiver. It's
>sad we don't know a way to detect the cable insertion event without
>enabling transceiver power.
>
>However, it looks like there exist a way and wince knows it, since
>GPIO80 is 0 in wince when serial cable is not plugged in. This means it
>knows how to detect the cable plug-in event and it enables the RS232
>transceiver power. Maybe it's connected to one of HAMCOP GPIO pins,
>I don't know.
>
>
>
The transceiver is a MAX3243. (datasheet available www.maxim-ic.com).
Reviewing the H22xx schematics, output R2OUTB of the transceiver is the
non-inverting receiver output (active in shutdown) and is tied to PXA
GPIO4. This one should change state even when the transceiver is shut
down, according to the spec. The actual DCD is wired to FF UART DCD,
gpio36. Note that the non-inverting DCD should be inverted from the
actual DCD, which is active low, according to signal names anyway.

Jamey
Received on Mon Feb 23 21:24:57 2004