mirror of https://gitee.com/openkylin/linux.git
48 lines
2.3 KiB
Plaintext
48 lines
2.3 KiB
Plaintext
Kernel driver w1_ds2423
|
|
=======================
|
|
|
|
Supported chips:
|
|
* Maxim DS2423 based counter devices.
|
|
|
|
supported family codes:
|
|
W1_THERM_DS2423 0x1D
|
|
|
|
Author: Mika Laitio <lamikr@pilppa.org>
|
|
|
|
Description
|
|
-----------
|
|
|
|
Support is provided through the sysfs w1_slave file. Each opening and
|
|
read sequence of w1_slave file initiates the read of counters and ram
|
|
available in DS2423 pages 12 - 15.
|
|
|
|
Result of each page is provided as an ASCII output where each counter
|
|
value and associated ram buffer is outpputed to own line.
|
|
|
|
Each lines will contain the values of 42 bytes read from the counter and
|
|
memory page along the crc=YES or NO for indicating whether the read operation
|
|
was successfull and CRC matched.
|
|
If the operation was successfull, there is also in the end of each line
|
|
a counter value expressed as an integer after c=
|
|
|
|
Meaning of 42 bytes represented is following:
|
|
- 1 byte from ram page
|
|
- 4 bytes for the counter value
|
|
- 4 zero bytes
|
|
- 2 bytes for crc16 which was calculated from the data read since the previous crc bytes
|
|
- 31 remaining bytes from the ram page
|
|
- crc=YES/NO indicating whether read was ok and crc matched
|
|
- c=<int> current counter value
|
|
|
|
example from the successfull read:
|
|
00 02 00 00 00 00 00 00 00 6d 38 00 ff ff 00 00 fe ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff crc=YES c=2
|
|
00 02 00 00 00 00 00 00 00 e0 1f 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff crc=YES c=2
|
|
00 29 c6 5d 18 00 00 00 00 04 37 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff crc=YES c=408798761
|
|
00 05 00 00 00 00 00 00 00 8d 39 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff crc=YES c=5
|
|
|
|
example from the read with crc errors:
|
|
00 02 00 00 00 00 00 00 00 6d 38 00 ff ff 00 00 fe ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff crc=YES c=2
|
|
00 02 00 00 22 00 00 00 00 e0 1f 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff crc=NO
|
|
00 e1 61 5d 19 00 00 00 00 df 0b 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff crc=NO
|
|
00 05 00 00 20 00 00 00 00 8d 39 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff crc=NO
|