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> 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
> 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
