When I compiling the project downloaded from http://www.keil.com/download/list/arm.htm, I met: STM32_Init.c(4968): error: #20: identifier "GPIOF" is undefined STM32_Init.c(4974): error: #20: identifier "GPIOG" is undefined usbhw.c(92): error: #136: struct "<unnamed>" has no field "IPR" usbhw.c(93): error: #136: struct "<unnamed>" has no field "ISER", and after I deleted them and downloaded to the MCBSTM32 board, I saw an "unkonwn device" displayed in the screen after connected to my PC, anything wrong since it is said "The example is tesed with the Keil Evaluation Board MCBSTM32."