Raspberry Pi library for GPIO, 1-Wire, SPI, System Time Counter (STC) access. There have been provided APIs for handling various popular devices.
License: BSD 2-Clause "Simplified" License
Thank you for sharing your great library for Raspberry Pi!
Trying to read the temperature off a DS18B20, I'm having the following issue:
Reading the temperature through /dev interface is giving me:
cat //sys/bus/w1/devices/28-000006c5aefc/w1_slave
4b 01 4b 46 7f ff 05 10 e1 : crc=e1 YES
4b 01 4b 46 7f ff 05 10 e1 t=20687
librasp is also seeing that sensor:
./dsth_list2
w1 master [0x00000001]
DS18B20 [0xe9000006c5aefc28]; T:85.0
However, the temperature reading is different (wrong) in librasp reading. The true temperature is about 20,687°C as indicated in the /dev reading.
Do you have any idea what I might be doing wrong?
./dsth_list
Feb 15 12:52:41 DEBUG: [NLSCK:3]: -> netlink [header]: len:0x00000030 type:0x0003 flags:0x0000 seq:0x00000000 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000000 ack:0xffffffff len:0x000c flags:0x0000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x06 status:0x00 len:0x0000 id:0x00000000|0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x00000034 type:0x0003 flags:0x0000 seq:0x00000000 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000000 ack:0x00000001 len:0x0010 flags:0x6269
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x06 status:0x00 len:0x0004 id:0x6e696c2d|0x672d7875 data[hex bts]:01000000
w1 master [0x00000001]
Feb 15 12:52:41 DEBUG: [NLSCK:3]: -> netlink [header]: len:0x00000034 type:0x0003 flags:0x0000 seq:0x00000001 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000001 ack:0xffffffff len:0x0010 flags:0x0000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x04 status:0x00 len:0x0004 id:0x00000001|0x00000000 data[hex bts]:02000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x0000003c type:0x0003 flags:0x0000 seq:0x00000001 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000001 ack:0x00000002 len:0x0018 flags:0x0000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x04 status:0x00 len:0x000c id:0x00000001|0x00000000 data[hex bts]:0200080028fcaec5060000e9
Feb 15 12:52:41 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x00000034 type:0x0003 flags:0x0000 seq:0x00000001 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000001 ack:0xffffffff len:0x0010 flags:0x0000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x04 status:0x00 len:0x0004 id:0x00000001|0x00000000 data[hex bts]:02000000
DS18B20 [0xe9000006c5aefc28]; T:Feb 15 12:52:41 DEBUG: [NLSCK:3]: -> netlink [header]: len:0x0000003e type:0x0003 flags:0x0000 seq:0x00000002 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000002 ack:0xffffffff len:0x001a flags:0x0000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x05 status:0x00 len:0x000e id:0xc5aefc28|0xe9000006 data[hex bts]:04000a00beffffffffffffffffff
Feb 15 12:52:41 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x00000024 type:0x0003 flags:0x0000 seq:0x00000000 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000000|0x00000000 seq:0x00000000 ack:0x00000000 len:0x0000 flags:0x0000; filtered out: no w1 msg
Feb 15 12:52:41 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x0000003e type:0x0003 flags:0x0000 seq:0x00000002 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000002 ack:0x00000003 len:0x001a flags:0x0000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x05 status:0x00 len:0x000e id:0xc5aefc28|0xe9000006 data[hex bts]:04000a00be50054b467fff0c101c
Feb 15 12:52:41 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x00000034 type:0x0003 flags:0x0000 seq:0x00000002 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000002 ack:0xffffffff len:0x0010 flags:0x0000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x05 status:0x00 len:0x0004 id:0xc5aefc28|0xe9000006 data[hex bts]:04000000
Feb 15 12:52:41 DEBUG: [dsth_probe] DS therm resolution: 12-bit
Feb 15 12:52:41 DEBUG: [NLSCK:3]: -> netlink [header]: len:0x00000035 type:0x0003 flags:0x0000 seq:0x00000003 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000003 ack:0xffffffff len:0x0011 flags:0x0000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x05 status:0x00 len:0x0005 id:0xc5aefc28|0xe9000006 data[hex bts]:0400010044
Feb 15 12:52:41 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x00000024 type:0x0003 flags:0x0000 seq:0x00000000 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000000|0x00000000 seq:0x00000000 ack:0x00000000 len:0x0000 flags:0x0000; filtered out: no w1 msg
Feb 15 12:52:41 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x00000035 type:0x0003 flags:0x0000 seq:0x00000003 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000003 ack:0x00000004 len:0x0011 flags:0x0000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x05 status:0x00 len:0x0005 id:0xc5aefc28|0xe9000006 data[hex bts]:0400010044
Feb 15 12:52:41 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x00000034 type:0x0003 flags:0x0000 seq:0x00000003 pid:0x00000000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000003 ack:0xffffffff len:0x0010 flags:0x0000
Feb 15 12:52:41 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x05 status:0x00 len:0x0004 id:0xc5aefc28|0xe9000006 data[hex bts]:04000000
Feb 15 12:52:42 DEBUG: [NLSCK:3]: -> netlink [header]: len:0x0000003e type:0x0003 flags:0x0000 seq:0x00000004 pid:0x00000000
Feb 15 12:52:42 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000004 ack:0xffffffff len:0x001a flags:0x0000
Feb 15 12:52:42 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x05 status:0x00 len:0x000e id:0xc5aefc28|0xe9000006 data[hex bts]:04000a00beffffffffffffffffff
Feb 15 12:52:42 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x00000024 type:0x0003 flags:0x0000 seq:0x00000000 pid:0x00000000
Feb 15 12:52:42 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000000|0x00000000 seq:0x00000000 ack:0x00000000 len:0x0000 flags:0x0000; filtered out: no w1 msg
Feb 15 12:52:42 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x0000003e type:0x0003 flags:0x0000 seq:0x00000004 pid:0x00000000
Feb 15 12:52:42 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000004 ack:0x00000005 len:0x001a flags:0x0000
Feb 15 12:52:42 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x05 status:0x00 len:0x000e id:0xc5aefc28|0xe9000006 data[hex bts]:04000a00be50054b467fff0c101c
Feb 15 12:52:42 DEBUG: [NLSCK:3]: <- netlink [header]: len:0x00000034 type:0x0003 flags:0x0000 seq:0x00000004 pid:0x00000000
Feb 15 12:52:42 DEBUG: [NLSCK:3]: nest. cn_msg [header]: id:0x00000003|0x00000001 seq:0x00000004 ack:0xffffffff len:0x0010 flags:0x0000
Feb 15 12:52:42 DEBUG: [NLSCK:3]: nest. w1_msg [header]: type:0x05 status:0x00 len:0x0004 id:0xc5aefc28|0xe9000006 data[hex bts]:04000000
Feb 15 12:52:42 DEBUG: [dsth_probe] temp-lsb:0x50, temp-hsb:0x05
85.0
Thank you very much in advance!
Martin
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