OK, so here is some feedback.
I can confirm that writing a value to Easystart starts a measurement:
- It sets delay to 0
- It set frequency to the same value that was written to Easystart
- It clears previous samples
- It clears rollover
- It starts the mission.
- (It probably also starts the clock, but I can't confirm that,
because I started it already manually.)
I have one problem though: I can't seem to be able to figure out how to
start a measurement with rollover.
- Easystart starts is w/o rollover.
- If I just enable rollover, it stops the running mission.
- If I simply try to launch the mission by any of the intuitive ways,
it won't start.
(I am trying these:
- writing 0 to delay
- writing a value into frequency
- writing YES into running
)
So I guess there is a sequence of things I must to to start a
measurement with rollover...
Any help would be appreciated.
(Next thing I will do, I'll look at the source code for easystart to
figure out the sequence for rollover.)
Kristof
On 2014-12-09 01:58, Paul Alfille wrote:
>
> Yes. Easystart is a convenience function. Otherwise there are a number
> of steps needed in sequence to start a measurement and a risk of
> bricking the device if the oscillator isn't started first. I'll admit
> I haven't looked at the thermochrons in some years so testing would be
> wise (and feedback welcome).
>
> On Dec 8, 2014 3:10 PM, "Jan Kandziora" <j...@gmx.de
> <mailto:j...@gmx.de>> wrote:
>
> Am 08.12.2014 um 19:14 schrieb Csillag Kristof:
> > On 2014-12-08 18:35, Colin Reese wrote:
> >> Check the datasheet. These parameters are well-documented.
> >
> > I tried to.
> >
> > I looked at http://datasheets.maximintegrated.com/en/ds/DS1921G.pdf
> >
> > It does not seem to contain the word "easystart".
> >
> >From owfs/module/owlib/src/c/ow_1921.c:
>
> static ZERO_OR_ERROR FS_easystart(struct one_wire_query *owq)
> {
> /* write 0x020E -- 0x0214 */
> BYTE data[] = { 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, };
>
> /* clear memory */
> RETURN_BAD_IF_BAD( OW_clearmemory(PN(owq))) ;
>
> /* Stop clock, no rollover, no delay, temp alarms on, alarms
> cleared */
> if ( BAD( OW_w_mem(data, 7, 0x020E, PN(owq)) ) ) {
> return -EINVAL;
> }
>
> return GB_to_Z_OR_E( OW_startmission(OWQ_U(owq), PN(owq)) );
> }
>
>
> When easystart is written (anything), this function writes clears the
> chip memory and writes 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 into
> 0x020e at further.
>
> It sets -EOSC, TLS, THS in the control register and clears the
> temperature, start delay and status registers.
>
> Kind regards
>
> Jan
>
>
> ------------------------------------------------------------------------------
> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> from Actuate! Instantly Supercharge Your Business Reports and
> Dashboards
> with Interactivity, Sharing, Native Excel Exports, App Integration
> & more
> Get technology previously reserved for billion-dollar
> corporations, FREE
>
> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk
> _______________________________________________
> Owfs-developers mailing list
> Owfs-developers@lists.sourceforge.net
> <mailto:Owfs-developers@lists.sourceforge.net>
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
>
>
>
> ------------------------------------------------------------------------------
> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
> with Interactivity, Sharing, Native Excel Exports, App Integration & more
> Get technology previously reserved for billion-dollar corporations, FREE
> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk
>
>
> _______________________________________________
> Owfs-developers mailing list
> Owfs-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
------------------------------------------------------------------------------
Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
from Actuate! Instantly Supercharge Your Business Reports and Dashboards
with Interactivity, Sharing, Native Excel Exports, App Integration & more
Get technology previously reserved for billion-dollar corporations, FREE
http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk
_______________________________________________
Owfs-developers mailing list
Owfs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/owfs-developers
