hi Patrick,
PIO property is driving the output state. reading to this property is done
without accessing the chip.
to know the actual input state, read sensed property.
Pascal
2011/3/29 p4trykx <p4tr...@o2.pl>
> Hello
> I was looking at the code ow_2408.c and I have 2 questions regarding Hobby
> boards LCD.
>
> First: how does the initialization works. I see that there is some check
> if the initialization took place
> Cache_Get_SlaveSpecific....
> but what if I loose power and the LCD resets. Could OWFS somehow figure
> out that LCD needs to be restarted?
> I know there is no read back from the LCD possible but maybe some info
> from latches could be useful.
> Or maybe the Cache_Get... expires after some time and the LCD gets
> reinitialized regardless every few minutes?
>
> Second: I noticed that there is are macros
> #define NIBBLE_TWO(x) (((x)<<4)&0xF0) and others
>
> the 0 in 0xF0 is responsible for resetting three unused PIO (0,1,2) on
> DS2408. I thought of a modification that would check the state of those
> PIOs set by the user and sending the required states. As I mention in some
> previous posts I connected the backlight to PIO.0 and I have to renew it
> after every write to the display. Now I use a hardware workaround
> (transistors with a capacitor).
>
> If i set some PIO I can read the state without querying the bus and DS2408.
> printf "1" > /mnt/owfs/XXXXXXX/PIO.0
> and then when I read it
> cat /mnt/owfs/XXXXXXX/PIO.0
> OWFS gets the value form cache?
>
> Could I somehow check this in ow_2408.c?
>
> --
> p4trykx
>
>
> ------------------------------------------------------------------------------
> Enable your software for Intel(R) Active Management Technology to meet the
> growing manageability and security demands of your customers. Businesses
> are taking advantage of Intel(R) vPro (TM) technology - will your software
> be a part of the solution? Download the Intel(R) Manageability Checker
> today! http://p.sf.net/sfu/intel-dev2devmar
> _______________________________________________
> Owfs-developers mailing list
> Owfs-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
--
Pascal
www.brain4home.eu
to subscribe, send a mail to <list-subscr...@brain4home.eu>
------------------------------------------------------------------------------
Enable your software for Intel(R) Active Management Technology to meet the
growing manageability and security demands of your customers. Businesses
are taking advantage of Intel(R) vPro (TM) technology - will your software
be a part of the solution? Download the Intel(R) Manageability Checker
today! http://p.sf.net/sfu/intel-dev2devmar
_______________________________________________
Owfs-developers mailing list
Owfs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/owfs-developers
