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SK-TDA4VM: 板子上CAN信号发送接受问题

Part Number: SK-TDA4VM

root@j721e-eaik:~# ip link set can0 type can bitrate 500000
root@j721e-eaik:~# ip link set can1 type can bitrate 500000
root@j721e-eaik:~#
root@j721e-eaik:~#
root@j721e-eaik:~#
root@j721e-eaik:~# ip link set up can0
root@j721e-eaik:~# ip link set up can1
root@j721e-eaik:~#
root@j721e-eaik:~#
root@j721e-eaik:~# candump can0 &

[1]1620

root@j721e-eaik:~# cansend can1 123#1122334455667788

后面没有回复,请问为什么