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Problem with TWR-K64F120M and TWR-SER ethernet

Question asked by Kevin Alden on Jan 26, 2015
Latest reply on Jan 26, 2015 by Kevin Alden

I am having trouble getting the KSDK 1.1.0 lwIp ping demo running on the TWR-K64F120M.  I have set all the jumpers on the two boards according to this document:


I believe the intention is to configure TWR-SER for RMII and enable the 50MHz clock to be routed up to the K64.  With the jumpers in this configuration, I cannot get my program to main.  here is the gdb output:


(gdb) b main

Breakpoint 1 at 0x8df4: file /home/kalden/Freescale/KSDK_1.1.0/demos/lwip_ping_demo/ping_rtos/src/ping.c, line 286.

(gdb) c



Program received signal SIGTRAP, Trace/breakpoint trap.

0x00008f6c in SystemInit () at /home/kalden/Freescale/KSDK_1.1.0/platform/startup/MK64F12/system_MK64F12.c:237

237    while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) {



Now, If I remove J32 and connect J33 on the TWR-K64, the software seems to run as expected.  I just don't see any packets coming out of the board.  It is my understanding that populating J33 uses the K64 onboard clock.  J32 disables this and should use the 50MHz clock from TWR-SER.  Could I be missing a jumper setting somewhere?  I'm not sure where to go from here.