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stm324xg_eval usb_device_CDC_Standalone example porting to stm32f4discovery

Question asked by tag.aseok on Apr 28, 2015
I'm trying to port this usb_device_CDC_Standalone example to stm32f4discovery.
I changed mcu to stm32f407vgt and changed it's clock related configuration, then programmed it to stm32f4discovery, it worked without any problem. 
I have some questions about this example:
- HAL sram library is included, what is it's usage?
- I tried to make a project like that and source/header files myself, but it didn't work.
which of the source files(stm32cubef4 library) should be modified for it's proper operation?