Hi Gary,
you use K21 I suggest you use KDS3.2 which is a free SW without code size limitation
Kinetis Design Studio Integrated Development Environment (IDE)|NXP
or you can also use CW10.7
CodeWarrior for Microcontrollers-Eclipse IDE|NXP
the CW special edition (free version) has 64KB code and data size limit for Kinetis E,L,M Series
for more information, see http://cache.nxp.com/files/soft_dev_tools/doc/fact_sheet/950-00437.pdf
Have a great day,
Jennie Zhang
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