plan9-gpl/sys/man/3/twsi

.TH TWSI 3 
.SH NAME
twsi - two-wire serial interface (TWSI) and inter-integrated circuit (I⁲C) interface
.SH SYNOPSIS
.B bind -a #⁲ /dev
.sp 0.3v
.B /dev/twsi*
.SH DESCRIPTION
The
.I twsi
device serves a one-level directory containing one file per TWSI or I⁲C bus.
Bytes written are transmitted on the bus;
bytes received from the bus are queued and delivered by reading.
Seeking to a given offset before reading or writing causes the
.I twsi
device to use that offset as a TWSI slave address for a subsequent
.IR read (2)
or
.IR write
call.
.SH FILES
.B #⁲/twsi*
.SH SOURCE
.B /sys/src/9/*/devtwsi.c
.SH BUGS
10-bit addressed devices are not supported.
.PP
No slave mode.
.PP
Setting the bus rate is not supported.