3 twsi - two-wire serial interface (TWSI) and inter-integrated circuit (IC) interface
11 device serves a one-level directory containing one file per TWSI or IC bus.
12 Bytes written are transmitted on the bus;
13 bytes received from the bus are queued and delivered by reading.
14 Seeking to a given offset before reading or writing causes the
16 device to use that offset as a TWSI slave address for a subsequent
24 .B /sys/src/9/*/devtwsi.c
26 10-bit addressed devices are not supported.
30 Setting the bus rate is not supported.