Hi Dominik,
Freescale provides USB Stack V4.1.1 includes KL25 USB CDC host example code.
Please download USB Stack v4.1.1 from below link:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MEDICALUSB&fpsp=1&tab=Design_Tools_Ta...
And the KL25 USB CDC Host example located at default path:
C:\Freescale\Freescale USB Stack v4.1.1\Source\Host\examples\cdc_serial\iar_ew\kinetis_l2k
Wish it helps.
best regards
Ma Hui
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