Hi, Wang,
The SDK1.2 is very old, pls download the latest one SDK2.0 from the website:
http://www.nxp.com/ksdk
For the FlexCAN example, pls refer to the example:
C:\Freescale\SDK2.0_K64F\boards\frdmk64f\driver_examples\flexcan\loopback_transfer\kds
there is readme.txt which says:
"
To demonstrates this example, only one board is needed. The exmaple will config one FlexCAN Message
Buffer to Rx Message Buffer and the other FlexCAN Message Buffer to Tx Message Buffer with same ID.
After that, the exmaple will send a CAN Message from the Tx Message Buffer to the Rx Message Buffer
throuth internal loopback interconnector and print out the Message payload to terminal."
If you change the receiving ID so that the receiving ID and transmitting ID are different, it is okay.
Hope it can help you
BR
Xiangjun Rong