1 Kernel driver w1_ds2423
2 =======================
3
4 Supported chips:
5
6 * Maxim DS2423 based counter devices.
7
8 supported family codes:
9
10 =============== ====
11 W1_THERM_DS2423 0x1D
12 =============== ====
13
14 Author: Mika Laitio <lamikr@pilppa.org>
15
16 Description
17 -----------
18
19 Support is provided through the sysfs w1_slave
20 read sequence of w1_slave file initiates the r
21 available in DS2423 pages 12 - 15.
22
23 Result of each page is provided as an ASCII ou
24 value and associated ram buffer is outpputed t
25
26 Each lines will contain the values of 42 bytes
27 memory page along the crc=YES or NO for indica
28 was successful and CRC matched.
29 If the operation was successful, there is also
30 a counter value expressed as an integer after
31
32 Meaning of 42 bytes represented is following:
33
34 - 1 byte from ram page
35 - 4 bytes for the counter value
36 - 4 zero bytes
37 - 2 bytes for crc16 which was calculated from
38 - 31 remaining bytes from the ram page
39 - crc=YES/NO indicating whether read was ok a
40 - c=<int> current counter value
41
42 example from the successful read::
43
44 00 02 00 00 00 00 00 00 00 6d 38 00 ff ff 00
45 00 02 00 00 00 00 00 00 00 e0 1f 00 ff ff 00
46 00 29 c6 5d 18 00 00 00 00 04 37 00 ff ff 00
47 00 05 00 00 00 00 00 00 00 8d 39 ff ff ff ff
48
49 example from the read with crc errors::
50
51 00 02 00 00 00 00 00 00 00 6d 38 00 ff ff 00
52 00 02 00 00 22 00 00 00 00 e0 1f 00 ff ff 00
53 00 e1 61 5d 19 00 00 00 00 df 0b 00 ff ff 00
54 00 05 00 00 20 00 00 00 00 8d 39 ff ff ff ff
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.