Hi,
I am using a Raspberry 3B+ and a 2 Channel CAN BUS FD Shield with MCP2518FD and RTC. And use other one Raspberry 3B and other one 2 Channel CAN BUS FD Shield with MCP2518FD and RTC.
Default configuration using dtoverlay = seeed-can-fd-hat-v2 is:
can0 of 2 Channel CAN BUS FD Shield with MCP2518FD and RTC connects to can0 of other one 2 Channel CAN BUS FD Shield with MCP2518FD and RTC(can_0_h <===> can_0_h, can_0_l <===> can_0_l)
One Raspberry 3B+ uses the command:
$ cansend can0 123#1234
Error will occur
pi@raspberrypi:~ $ dmesg | grep spi
[ 11.271875] spi_master spi0: will run message pump with realtime priority
[ 11.298208] mcp251xfd spi0.1 can0: MCP2518FD rev0.0 (-RX_INT -MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD c:40.00MHz m:20.00MHz r:17.00MHz e:16.66MHz) successfully initialized.
[ 11.329832] mcp251xfd spi0.0 can1: MCP2518FD rev0.0 (-RX_INT -MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD c:40.00MHz m:20.00MHz r:17.00MHz e:16.66MHz) successfully initialized.
[ 246.853584] mcp251xfd spi0.1 can0: CRC read error at address 0x0010 (length=4, data=80 0c 23 19, CRC=0x2854) retrying.
[ 246.866056] mcp251xfd spi0.1 can0: CRC read error at address 0x0010 (length=4, data=80 aa 2a 19, CRC=0x16ac) retrying.
…
$ ifconfig -a
can0: flags=193<UP,RUNNING,NOARP> mtu 72
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 65536 (UNSPEC)
RX packets 1105741 bytes 8845928 (8.4 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 1105755 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 200
Other one Raspberry 3B uses the command:
$ candump can0 -x
Can’t receive any message.
How could I solve this problem?
If I use a Raspberry 3B+(or Raspberry 3B) and a 2 Channel CAN BUS FD Shield with MCP2518FD and RTC, connect the channels(
can_0_L <===> can_1_L, can_0_H <===> can_1_H)
Use the command:
$ cansend can0 123#1234
$ candump can1 -x
can1 RX - - 123 [2] 12 34
(I can receive the message)
Thank you