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
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