CAN Notes

SocketCAN

socketcan.endpoints.1.interface = vcan0 socketcan.endpoints.1.events.enable = true socketcan.endpoints.1.events.enable = true socketcan.endpoints.1.filter.1.id = 0 socketcan.endpoints.1.filter.1.mask = 0

socketcan.endpoints.1.filter.1.id = 127 socketcan.endpoints.1.filter.1.mask = 0

socketcan.endpoints.1.filter.1.id = 127 socketcan.endpoints.1.filter.2.id = 52 socketcan.endpoints.1.filter.3.id = 64

---

$ sudo modprobe vcan $ sudo ip link add dev vcan0 type vcan $ sudo ip link set up vcan0

---

$ sudo apt-get install can-utils

$ candump vcan0 -i

---

CAN Byte Order

0x0102 0x08ab

Offset  Big  Little
0       01   02
1       02   01
2       08   ab
3       ab   08
4
5
6
7

        Bit
Byte 0  76543210
     1            0
     2            8
     3           16
     4           24
     5           32
     6           48
     7           56

---

<signalDefinition>
	<message id="127">
		<signal name="outsideTemperature">
			<data offset="0" length="12"/>
			<range min="0" max="123"/>
			<value physicalQuantity="temperature"
				   physicalUnit="degC"
				   type="signed"
				   slope="0.1"
				   intercept="-40"/>
		</signal>
	</message>
</signalDefinition>

Types: unsigned signed single double