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! 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