USB_Istr <-- USB_LP_CAN1_RX0_IRQHandler
|   CTR_LP
|   |   In0_Process
|   |   Setup0_Process
|   |   Out0_Process
|   |   (*pEpInt_OUT[EPindex-1])() -- Callback
|   |   |   EP1_OUT_Callback
|   |   |   |   GetENDPOINT
|   |   |   |   GetEPDblBuf0Count
|   |   |   |   GetEPDblBuf1Count
|   |   |   |   PMAToUserBufferCopy
|   |   |   EP2_OUT_Callback
|   |   |   EP3_OUT_Callback
|   |   |   EP4_OUT_Callback
|   |   |   EP5_OUT_Callback
|   |   |   EP6_OUT_Callback
|   |   |   EP7_OUT_Callback
|   |   (*pEpInt_IN[EPindex-1])()
|   |   |   EP1_IN_Callback
|   |   |   EP2_IN_Callback
|   |   |   EP3_IN_Callback
|   |   |   EP4_IN_Callback
|   |   |   EP5_IN_Callback
|   |   |   EP6_IN_Callback
|   |   |   EP7_IN_Callback            
|   Speaker_Reset -- Callback

Setup0_Process
|    NoData_Setup0
|    |    Standard_SetConfiguration
|    |    Standard_SetDeviceFeature
|    |    Standard_ClearFeature
|    |    Standard_SetInterface
|    |    |    Speaker_Get_Interface_Setting - **Callback** via Class_Get_Interface_Setting
|    |    |    Speaker_SetInterface - **Callback** via User_SetInterface
|    |    Standard_ClearFeature
|    |    Standard_SetEndPointFeature
|    |    Class_NoData_Setup
|    |    USB_StatusIn
|    Data_Setup0  
|    Post0_Process

USB_HP_CAN1_TX_IRQHandler / USB_HP_IRQHandler
|    CTR_HP();
|   |   (*pEpInt_OUT[EPindex-1])() -- Callback
|   |   |   EP1_OUT_Callback
|   |   |   |   GetENDPOINT
|   |   |   |   GetEPDblBuf0Count
|   |   |   |   GetEPDblBuf1Count
|   |   |   |   PMAToUserBufferCopy
|   |   |   EP2_OUT_Callback
|   |   |   EP3_OUT_Callback
|   |   |   EP4_OUT_Callback
|   |   |   EP5_OUT_Callback
|   |   |   EP6_OUT_Callback
|   |   |   EP7_OUT_Callback
|   |   (*pEpInt_IN[EPindex-1])()
|   |   |   EP1_IN_Callback
|   |   |   EP2_IN_Callback
|   |   |   EP3_IN_Callback
|   |   |   EP4_IN_Callback
|   |   |   EP5_IN_Callback
|   |   |   EP6_IN_Callback
|   |   |   EP7_IN_Callback          
 

USB_Init
|    Speaker_init - Callback
|    |    Get_SerialNum
|    |    PowerOn
|    |    |    USB_Cable_Config
|    |    USB_SIL_Init
|    |    |  _SetISTR
|    |    |  _SetCNTR

The usb_regs module implements the hardware abstraction layer, it offers a set of basic functions for accessing the USB-FS_Device peripheral registers.

All operations with endpoint registers can be obtained with the SetENDPOINT and GetENDPOINT functions. However, many functions are derived from these to offer the advantage of a direct action on a specific field.