Lines Matching +full:multi +full:- +full:word

1 .. SPDX-License-Identifier: GPL-2.0
7 by Wolfram Sang <wsa@sang-engineering.com> in 2020
11 easy to obtain). Examples include multi-master testing, and SMBus Host Notify
21 # echo "slave-testunit 0x1030" > /sys/bus/i2c/devices/i2c-0/new_device
23 After that, you will have a write-only device listening. Reads will just return
24 an 8-bit version number of the testunit. When writing, the device consists of 4
25 8-bit registers and all must be written to start a testcase, i.e. you must
28 0x00 CMD   - which test to trigger
29 0x01 DATAL - configuration byte 1 for the test
30 0x02 DATAH - configuration byte 2 for the test
31 0x03 DELAY - delay in n * 10ms until test is started
33 Using 'i2cset' from the i2c-tools package, the generic command looks like:
35 # i2cset -y <bus_num> <testunit_address> <CMD> <DATAL> <DATAH> <DELAY> i
45 --------
50    DATAL - address to read data from (lower 7 bits, highest bit currently unused)
51    DATAH - number of bytes to read
53 This is useful to test if your bus master driver is handling multi-master
59 # i2cset -y 0 0x30 0x01 0x50 0x80 0x05 i
62    DATAL - low byte of the status word to send
63    DATAH - high byte of the status word to send
66 status word is currently ignored in the Linux Kernel. Example to send a
69 # i2cset -y 0 0x30 0x02 0x42 0x64 0x01 i