I have 2 frdm k64 development boards and I am trying to use CAN bus for making communication happen between the boards. For this I tried flexcan_loopback example in MCUXpressoIDE_10.2.1_795. In the readme part it I saw that PTB16 and PTB17 are to be connected. I couldnt find the pins PTB16 and PTB17 in the board. Can I know from where the output of those pins## taken. Thank You.