Copyright (c) 2015 M. Warner Losh
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$FreeBSD: stable/11/share/man/man9/owll.9 336346 2018-07-16 15:02:21Z kevans $

.Dd July 20, 2015 .Dt OWLL 9 .Os .Sh NAME .Nm owll .Nm OWLL_WRITE_ONE , .Nm OWLL_WRITE_ZERO , .Nm OWLL_READ_DATA , .Nm OWLL_REASET_AND_PRESENCE .Nd Dallas Semiconductor 1-Wire Link Layer Interface .Sh SYNOPSIS .Ft int .Fn OWLL_WRITE_ONE "device_t lldev" "struct ow_timing *timing" .Ft int .Fn OWLL_WRITE_ZERO "device_t lldev" "struct ow_timing *timing" .Ft int .Fn OWLL_READ_DATA "device_t lldev" "struct ow_timing *timing" "int *bit" .Ft int .Fn OWLL_RESET_AND_PRESENCE "device_t lldev" "struct ow_timing *timing" "int *bit" .Sh DESCRIPTION The .Nm interface provides access to the link layer of the Dallas Semiconductor 1-Wire from upper layers of the protocol.

p .Fn OWLL_WRITE_ONE and .Fn OWLL_WRITE_ZERO writes a one bitor a zero bit respectively on the 1-Wire bus.

p .Fn OWLL_READ_DATA reads one bit from the 1-Wire bus. This is often referred to as a .Dq Read Time Slot in the 1-Wire device data sheets.

p The .Fn 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. .Sh NOTES This interface is intended to be used only by the .Xr ow 4 device to talk to the low-level bus. By convention, the device that implements this interface is called .Xr owc 4 . Only devices that implement .Xr own 9 should call these interfaces. .Sh SEE ALSO .Xr ow 4 , .Xr owc 4 , .Xr own 9 .Sh LEGAL .Tn 1-Wire is a registered trademark of Maxim Integrated Products, Inc. .Sh HISTORY The .Nm driver first appeared in .Fx 11.0 . .Sh AUTHORS The .Nm device driver and this manual page were written by .An Warner Losh .