NAME

       owll  OWLL_WRITE_ONE,  OWLL_WRITE_ZERO,  OWLL_READ_DATA,  OWLL_REASET_AND_PRESENCE — Dallas Semiconductor
       1-Wire Link Layer Interface

SYNOPSIS

       int
       OWLL_WRITE_ONE(device_t lldev, struct ow_timing *timing);

       int
       OWLL_WRITE_ZERO(device_t lldev, struct ow_timing *timing);

       int
       OWLL_READ_DATA(device_t lldev, struct ow_timing *timing, int *bit);

       int
       OWLL_RESET_AND_PRESENCE(device_t lldev, struct ow_timing *timing, int *bit);

DESCRIPTION

       The owll interface provides access to the link layer of the Dallas Semiconductor 1-Wire from upper layers
       of the protocol.

       OWLL_WRITE_ONE() and OWLL_WRITE_ZERO() writes a one bit or a zero bit respectively on the 1-Wire bus.

       OWLL_READ_DATA() reads one bit from the 1-Wire bus.  This is often referred to as a “Read Time  Slot”  in
       the 1-Wire device data sheets.

       The  OWLL_RESET_AND_PRESENCE()  function starts a reset sequence and detects if any device(s) are present
       on the bus.  This is the beginning of all 1-Wire transactions.

NOTES

       This interface is intended to be used only by the  ow(4)  device  to  talk  to  the  low-level  bus.   By
       convention,  the  device  that  implements  this interface is called owc(4).  Only devices that implement
       own(9) should call these interfaces.

SEE ALSO

       ow(4), owc(4), own(9)

LEGAL

       1-Wire is a registered trademark of Maxim Integrated Products, Inc.

HISTORY

       The owll driver first appeared in FreeBSD 11.0.

AUTHORS

       The owll device driver and this manual page were written by Warner Losh.

Debian                                         September 22, 2016                                        OWLL(9)