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Problems implementing USB MSD bootloader on K20

Question asked by Primoz REBEC on Nov 29, 2013
Latest reply on Feb 25, 2014 by Primoz REBEC

Hi all,


i am trying to implement USB MSD device bootloader using Kinetis K20, CodeWarrior 10.4, processor expert and MQX lite OS. I think there is a problem with USB somewhere because my device is correctly enumerated and i can see file in BOOTOLOADER MSD drive when i attach my device to computer. Problem is when i try to write file to MSD drive. Windows reports timeout writing after few minutes. I did some debugging in MSD_Event_Callback function found in disk.c and figured out that USB_MSC_DEVICE_WRITE_REQUEST case is NEVER reached.  Any advice would be appreciated.