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STM32F103 usb example not working

Question asked by aruns06 on Mar 16, 2015
Latest reply on Mar 17, 2015 by Chinzei.Tsuneo
I'm trying to run a sample USB (memory) program present in Keil IDE. The source is located in C:\Keil\ARM\Boards\ST\CQ-STARM2\USBMem. As per the description, after loading the program,  the  USB Memory is automatically recognized by the host PC running Windows which will load a generic Mass Storage driver. I'm can compile and upload the program. After that I reset the hardware and plugged the USB (Mini) cable but nothing happens. As per the description the board is designed to run on 'STM32F103VB' controller. but I am using STM32F103RB. Also the example is designed for 'CQ-STARM2' Evaluation Board. But I 'm using a customized hardware. Where PA12 -D+ ,PA11-D-. In the sample program I never saw
the GPIO pins PA12 and PA11 configured. Any suggestions?