Difference between revisions of "Application note - CANbus on fitlet2 with FC-SCG running Linux"
From fit-PC wiki
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*[https://fit-iot.com/files/download/fitlet2/sw/drivers/Linux/fitlet2-linux-FTDI-CAN-sniffer-master.tar.gz fitlet2 FTDI CAN sniffer] | *[https://fit-iot.com/files/download/fitlet2/sw/drivers/Linux/fitlet2-linux-FTDI-CAN-sniffer-master.tar.gz fitlet2 FTDI CAN sniffer] | ||
− | Simple CAN bus sniffer | + | ==Simple CAN bus sniffer== |
+ | |||
Purposed for the following chain: FTDI232H <-> MCP2515. | Purposed for the following chain: FTDI232H <-> MCP2515. | ||
Tested on Linux 4.14.41 (Debian sid) | Tested on Linux 4.14.41 (Debian sid) | ||
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sniff.static -- statically linked executable | sniff.static -- statically linked executable | ||
− | Usage: | + | '''Usage:''' |
Prints received frames to STDOUT, sends to net frames gotten from STDIN. | Prints received frames to STDOUT, sends to net frames gotten from STDIN. | ||
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Allowed frame to be sent format: | Allowed frame to be sent format: | ||
− | sid:paiload[0...i] | + | sid:paiload[0...i] |
− | sid-eid:paiload[0...i] | + | sid-eid:paiload[0...i] |
where i must be less than 8 | where i must be less than 8 | ||
For more detailed explanation of the mentioned options please read the MCP2515. | For more detailed explanation of the mentioned options please read the MCP2515. | ||
− | + | [http://ww1.microchip.com/downloads/en/DeviceDoc/20001801H.pdf CAN bus interface chip datasheet] | |
− | http://ww1.microchip.com/downloads/en/DeviceDoc/20001801H.pdf | + | |
Revision as of 11:42, 3 October 2018
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)
Prerequisites: libmpsse-1.3
libftdi1-1.4 via https://www.intra2net.com/en/developer/libftdi/repository.php libusb-1.0 via https://libusb.info/
Avaliable binaries:
sniff -- dynamically linked against mentioned libraries sniff.static -- statically linked executable
Usage:
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 [01] a given RX buffer is to receive all frames --rollover rollover mode for RX buffer 0 --mask [01]:sid-eid acceptance mask for a mentioned RX buffer --filter [012345]: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:
sid:paiload[0...i] sid-eid:paiload[0...i]
where i must be less than 8
For more detailed explanation of the mentioned options please read the MCP2515. CAN bus interface chip datasheet