OWLL(9)                FreeBSD Kernel Developer's Manual               OWLL(9)

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.

FreeBSD 13.1-RELEASE-p6       September 22, 2016       FreeBSD 13.1-RELEASE-p6