> Dan,
> You are in the best condition to judge, but the PIO controls (sense, PIO,
> latch) should work. At least if the datasheet is accurate.

Hi Paul,

I am also not successful, the log says:

--- OneWireQuery done
  DEBUG: Selecting a path (and device) path=/42.577402000000/PIO.A SN=42 57 74 
02 00 00 00 63 last path=00 00 00 00 00 00 00 00
   DATA: DS9490_reset
   DATA: DS9490_reset: ok
  DEBUG:   Transaction select = 0
  DEBUG:   Transaction send = 0
  DEBUG:   Transaction readin = 0
  DEBUG:   Transaction end = 0
  DEBUG: FS_r_given_bus FS_r_local return=-22
  DEBUG: FS_r_given_bus return -22
  DEBUG: READ_POSTPOSTPARSE: /42.577402000000/PIO.A return -22
  DEBUG: READ_POSTPARSE /42.577402000000/PIO.A return -22
  DEBUG: FS_OWQ_destroy of /42.577402000000/PIO.A
  DEBUG: ParsedName_destroy /42.577402000000/PIO.A
   unique: 180, error: -22 (Invalid argument), outsize: 16
unique: 181, opcode: RELEASE (18), nodeid: 16, insize: 64
RELEASE[0] flags: 0x8000
   CALL: RELEASE path=/42.577402000000/PIO.A
   unique: 181, error: 0 (Success), outsize: 16


It have just updated from CVS and it is the same.

The problem occures in owfs/module/owlib/src/c/ow_read.c
on line 352 (I think), the call:

    if ( pn->selected_filetype->read == NO_READ_FUNCTION )
        return -ENOTSUP;

says, that there is no function defined for reading. But as I see, the
function is defined, I don't know why it has value eq to NO_READ_FUNCTION.



cheers
dan



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