MDK-Middleware v8 introduced the following changes:

General:
- MDK bundle with source code replaces MDK-Pro and MDK-Plus bundles with pre-built libraries.
- removed CORE component variants.
- added requirement for C compiler version 11 (C11).
- removed support for legacy Arm Compiler 5.
- removed support for CMSIS-RTOS version 1.
USB debug:
- changed source configuration file to header (USB_Debug.c -> USB_Debug.h).
USB Device specific:
- changed source configuration files to headers (USBD_Config_0..3.c -> USBD_Config_0..3.h).
USB Host specific:
- changed source configuration files to headers (USBH_Config_0..3.c -> USBH_Config_0..3.h).
- removed OHCI and EHCI drivers (moved to CMSIS-Driver pack).

The following sections show how to migrate projects from previous version of the MDK-Middleware (v7):

Component migration describes how to migrate the USB Component selection.
Configuration migration describes how to migrate the USB Component configuration.

Component migration

To migrate the USB Component make the following changes to component selection:

Keil::USB: select MDK bundle instead MDK-Pro or MDK-Plus bundle.
Keil::USB:CORE: deselect Debug or Release variant if one was selected.

Note

If the Event Recorder was used for debugging, please select the Event Recorder from the CMSIS-View pack instead the one from the ARM_Compiler pack.
USB Component requires C Compiler supporting C11 standard or higher.

If any other component is used, like Network or File System, please refer to its Migration Guide.

Configuration migration

if the USB_Debug.c file exists, then compare it with the new USB_Debug.h file and copy old values into the new file:
- if the old file does not exist then debugging was not configured previously
- note that USB Device Debug and USB Host Debug order has swapped in the new configuration file. width=90%

compare the existing USBD_Config_0..3.c files with the new USBD_Config_0..3.h files and copy old values into the new files: width=90%

compare the existing USBH_Config_0..3.c files with the new USBH_Config_0..3.h files and copy old values into the new files:
- the USBH_Config_0..3.h does not contain separate settings for Custom, OHCI or EHCI controllers anymore, so to migrate to the new configuration file note which Controller Interface was selected in the old USBH_Config_0..3.c file and copy appropriate controller's previous settings to the new configuration file.
- for Memory Pool Size update the new value by adding 128 since old setting did not include additional necessary space for memory pool internal operation. width=90%

Note: OHCI and EHCI drivers are not a part of the MDK-Middleware anymore but are distributed separately via the CMSIS-Driver pack, so please consult CMSIS-Driver documentation on configuring and using those drivers.