Posted on May 17, 2011 at 14:27> But, D+ pull-up resistor is connected to PA12 of MCU.
This OTG engine has on-chip pull-up resistor(s). You don't need any external one.
> I am setting this GPIO pin so that D+ pull-up resistor is enabled. Still, I could see that the device is not getting detected..
Check the voltage of D+ and D- lines. Do you see the pull-up voltage at one of these lines?
As Windows don't tell any USB hardware connection, I believe these lines are kept in low.
Maybe, the connection routine, which enables the external pull-up, is not called on your firmware.
Did you change the processor type on the header file, as follows?
The default is STM32F10X_XL. For STM32F107, STM32F10X_CL is chosen.
Or, as the tips suggests, add this definition to the compile option.
----------------- excerpt from the source code, from here ----------------
\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\stm32f10x.h
/* Uncomment the line below according to the target STM32 device used in your
application
*/
#if !defined (STM32F10X_LD) && !defined (STM32F10X_LD_VL) && !defined (STM32F10X_MD) && !defined (STM32F10X_MD_VL) && !defined (STM32F10X_HD) && !defined (STM32F10X_XL) && !defined (STM32F10X_CL)
/* #define STM32F10X_LD */ /*!< STM32F10X_LD: STM32 Low density devices */
/* #define STM32F10X_LD_VL */ /*!< STM32F10X_LD_VL: STM32 Low density Value Line devices */
/* #define STM32F10X_MD */ /*!< STM32F10X_MD: STM32 Medium density devices */
/* #define STM32F10X_MD_VL */ /*!< STM32F10X_MD_VL: STM32 Medium density Value Line devices */
/* #define STM32F10X_HD */ /*!< STM32F10X_HD: STM32 High density devices */
// #define STM32F10X_XL /*!< STM32F10X_XL: STM32 XL-density devices */ // <------ comment this line
#define STM32F10X_CL /*!< STM32F10X_CL: STM32 Connectivity line devices */ // <------ recover this line
#endif
/* Tip: To avoid modifying this file each time you need to switch between these
devices, you can define the device in your toolchain compiler preprocessor.
----------------- to here ----------------
Tsuneo
