Application note - CANbus on fitlet2 with FC-SCG running Linux
This application note applies to fitlet2 with FC-SCG FACET-Card running Linux. fitlet2 supports CAN if configured with the FC-SCG FACET.
The following application is required for the CAN bus functionality:
Simple CAN bus sniffer
Purposed for the following chain: FTDI232H <-> MCP2515.
Tested on Linux 4.14.41 (Debian sid)
libftdi1-1.4 via https://www.intra2net.com/en/developer/libftdi/repository.php libusb-1.0 via https://libusb.info/
sniff -- dynamically linked against mentioned libraries sniff.static -- statically linked executable
Prints received frames to STDOUT, sends to net frames gotten from STDIN. Options:
--can_bitrate Hz required CAN bus speed --can_osc Hz CAN clock oscillator frequency in fact
decimal modifiers 'k' and 'M' are allowed
--promiscuous  a given RX buffer is to receive all frames --rollover rollover mode for RX buffer 0 --mask :sid-eid acceptance mask for a mentioned RX buffer --filter :sid-eid acceptance filter
filters 0 and 1 are purposed for RX buffer 0 and the others for RX buffer 1
mask and filters format: n:sid-eid where: num number of mask or filter sid Standard identifier of mask/filter eid enhanced identifier of mask/filter
Omitted eid (if any) will be zeroed.
--sniff listen-only mode --showraw print out frames received/to be sent in hex
Allowed frame to be sent format:
- where "i" must be less than 8
For more detailed explanation of the mentioned options please read the MCP2515 datasheet:
MCP2515 CAN bus interface chip datasheet