1Kernel driver w1_ds2423 2======================= 3 4Supported chips: 5 6 * Maxim DS2423 based counter devices. 7 8supported family codes: 9 10 =============== ==== 11 W1_THERM_DS2423 0x1D 12 =============== ==== 13 14Author: Mika Laitio <lamikr@pilppa.org> 15 16Description 17----------- 18 19Support is provided through the sysfs w1_slave file. Each opening and 20read sequence of w1_slave file initiates the read of counters and ram 21available in DS2423 pages 12 - 15. 22 23Result of each page is provided as an ASCII output where each counter 24value and associated ram buffer is outpputed to own line. 25 26Each lines will contain the values of 42 bytes read from the counter and 27memory page along the crc=YES or NO for indicating whether the read operation 28was successful and CRC matched. 29If the operation was successful, there is also in the end of each line 30a counter value expressed as an integer after c= 31 32Meaning 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 the data read since the previous crc bytes 38 - 31 remaining bytes from the ram page 39 - crc=YES/NO indicating whether read was ok and crc matched 40 - c=<int> current counter value 41 42example from the successful read:: 43 44 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 45 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 46 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 47 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 48 49example from the read with crc errors:: 50 51 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 52 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 53 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 54 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 55