/**
  @page HID_Standalone USB Device Humain Interface (HID) example

  @verbatim
  ******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
  * @file    USB_Device/HID_Standalone/readme.txt
  * @author  MCD Application Team
  * @version V1.5.0
  * @date    14-April-2017
  * @brief   Description of the USB HID example.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright  2016 STMicroelectronics International N.V. 
  * All rights reserved.</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without 
  * modification, are permitted, provided that the following conditions are met:
  *
  * 1. Redistribution of source code must retain the above copyright notice, 
  *    this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  *    this list of conditions and the following disclaimer in the documentation
  *    and/or other materials provided with the distribution.
  * 3. Neither the name of STMicroelectronics nor the names of other 
  *    contributors to this software may be used to endorse or promote products 
  *    derived from this software without specific written permission.
  * 4. This software, including modifications and/or derivative works of this 
  *    software, must execute solely and exclusively on microcontroller or
  *    microprocessor devices manufactured by or for STMicroelectronics.
  * 5. Redistribution and use of this software other than as permitted under 
  *    this license is void and will automatically terminate your rights under 
  *    this license. 
  *
  * THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS" 
  * AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT 
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
  * PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
  * RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT 
  * SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  @endverbatim

@par Example Description

This application shows how to use the USB device application based on the Humain Interface (HID).

This is a typical example on how to use the USB peripheral in Device mode with HID class V1.11
following the "Device Class Definition for Human Interface Devices (HID) Version 1.11
Jun 27, 2001". The example is built around the USB device library and emulate the joystick by moving 
the host mouse pointer horizontally.

This example supports the remote wakeup feature (the ability to bring the USB suspended bus back
to the active condition), and the Key button is used as the remote wakeup source.

By default, in Windows OS, the USB mouse Power Management feature is turned off. This setting
is different from classic PS/2 computer functionality. To enable the Wake up from  standby
option, user has to manually turn on the Power Management feature for the USB mouse.

To enable the wake from standby option for the USB mouse, the following steps have to be followed:
 - Start "Device Manager",
 - Select "Mice and other pointing devices",
 - Select the "HID-compliant mouse" device (make sure that PID &VID are equal to 0x5710 & 0x0483 respectively)
 - Right click and select "Properties",
 - Select "Power Management" tab,
 - Finally click to select "Allow this device to wake the computer" check box.

The function GetPointerData() is responsible to move the mouse cursor automatically,
which can be easily customized (square, circle...).
In this application the cursor is moving forward and backward in an infinite loop.
 
At the beginning of the main program the HAL_Init() function is called to reset all the peripherals,
initialize the Flash interface and the systick. The user is provided with the SystemClock_Config()
function to configure the system clock (SYSCLK) to run at 72 MHz. The Full Speed (FS) USB module uses
internally a 48-MHz clock, which is generated from an integrated PLL.

@note To reduce the example footprint, the toolchain dynamic allocation is replaced by a static allocation
      by returning the address of a pre-defined static buffer with the HID class structure size.

@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
      based on the the SysTick ISR. Thus if HAL_Delay() is called from a peripheral ISR process, the SysTick interrupt 
      must have higher priority (numerically lower) than the peripheral interrupt, Otherwise the caller ISR process 
      will be blocked. To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function 
	  or statically define it in the HAL configuration file through the "TICK_INT_PRIORITY" define.

@note The application needs to ensure that the SysTick time base is set to 1 millisecond
      to have correct HAL configuration.

@par Directory contents

  - USB_Device/HID_Standalone/Src/main.c                  Main program
  - USB_Device/HID_Standalone/Src/system_stm32f1xx.c      STM32F1xx system clock configuration file
  - USB_Device/HID_Standalone/Src/stm32f1xx_it.c          Interrupt handlers
  - USB_Device/HID_Standalone/Src/usbd_conf.c             General low level driver configuration
  - USB_Device/HID_Standalone/Src/usbd_desc.c             USB device HID descriptor
  - USB_Device/HID_Standalone/Inc/main.h                  Main program header file
  - USB_Device/HID_Standalone/Inc/stm32f1xx_it.h          Interrupt handlers header file
  - USB_Device/HID_Standalone/Inc/stm32f1xx_hal_conf.h    HAL configuration file
  - USB_Device/HID_Standalone/Inc/usbd_conf.h             USB device driver Configuration file
  - USB_Device/HID_Standalone/Inc/usbd_desc.h             USB device MSC descriptor header file

@par Hardware and Software environment

  - This example runs on STM32F1xx devices.
    
  - This example has been tested with STM32F103RB-Nucleo Rev C board and can be
    easily tailored to any other supported device and development board.
	
  - STM32F103RB-Nucleo RevC Set-up
    Since there is no USB 2.0 Full speed connector (Type B) on the nucleo board, user has to make 
	his own USB shield daughter board with a USB connector and plug it on top of the  CN8 and CN9 
	connectors of the STM32F103RB-Nucleo. The USB connector has to be connected to the USB device associated GPIOs
	as follows:
       - USB-DP (D+ of the USB connector) <======> PA12 (Nucleo board)
	       Make sure to connect a 1.5KOhm pull up to USB-DP PA12 pin (permanent pull-up)
       - USB-DM (D- of the USB connector) <======> PA11 (Nucleo board)
	To improve EMC performance (noise immunity and signal integrity), it is recommended to connect a 100nF
	ceramic capacitor to the USB VDD pin.
	Make sure a 1.5KOhm pull up is connected to USB-DP PA12 pin (permanent pull-up). 

@par How to use it ?

In order to make the program work, you must do the following:
 - Open your preferred toolchain
 - Rebuild all files and load your image into target memory
 - Run the example

 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */
