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FRDM-KL25Z debugging too slow with Keil 5.1

Question asked by Al Niemi on Jul 16, 2014
Latest reply on Sep 15, 2014 by James Wnorowski

When single-stepping code (in flash) using the CMSIS-DAP Debugger on the FRDM-KL25Z with Keil 5.11 MDK it takes about 5 seconds
for each assembly-line to execute.  Any ideas on what would cause this to be so slow?  I am using the standard CMSIS and Device startup files when I create a new MKL25Z4 project.  
I should mention that debugging using the Pemicro OSJtag mode is fast enough, but then I lose some of the CMSIS features.  Keil Support says that this problem is likely on the FRDM-KL25Z board side and that I should just buy their ARM boards instead, which they claim work well in CMSIS-DAP mode.

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