This is a good point. It would make more sense if they were named trivially. The names vary a little bit from the DS1923, DS1922, and DS1921, so this may be the origin for some of the confusion and variation.
Colin On 12/11/2014 17:56, Csillag Kristof wrote: > Coliln, > > Thank you for the reference. > (I am already reading that document.) > > The only confusion (for a newbie) is that the names exposed by OWFS are > not trivially associated with the names described in the datasheet. > > (OWFS has fields like "running", "clear", "enabled", "easystart", while > the device has "MIP", "EM", EMCLR", etc.) > > So one needs to translate the language of the data sheet to the terms > used by OWFS. (And OWFS does some of the steps automatically...) > > I'll report back with something that is (hopefully) consumable for > everyone, as soon as I get it working. > > Kristof > > On 2014-12-12 02:52, Colin Reese wrote: >> Kristof, >> >> Sorry to sound like a broken record, but this is all in the datasheet. >> See, for example, here: >> >> http://datasheets.maximintegrated.com/en/ds/DS1921H-DS1921Z.pdf >> >> You cannot change mission parameters while a mission is active >> (rollover, for example). This must be done when no mission is active. >> The parameters are read-only during a mission. >> >> "Running" I assume refers to the Mission In Progress parameter, which >> you may write zero to to stop a mission, but cannot write 1 to to start >> one (this is done with Enable Mission). >> >> See pages 9 and 14 of the datasheet for help starting a mission, and >> page 36 for a stepwise example. >> >> Colin >> >> >> On 12/11/2014 17:32, Csillag Kristof wrote: >>> 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! 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