Hello Eric,
Yes, the emWIN demo is only available with the FRDM board but you can use the SDK for the FRDM-K22F as reference for your project.
The board specific files are pin_mux.c/h board.c/h and clock_config.c/h, so you need to adapt these files to your custom board, for example, you may need to change the pins used for the intialization of your LCD, you can check this out at pin_mux.c in the I2C1_InitPins function of the SDK emwin_gui_demo.
Best regards,
Aldo.
