/**
  @page HID_RTOS USB Host Humain Interface (HID) RTOS example
  
  @verbatim
  ******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
  * @file    USB_Host/HID_RTOS/readme.txt
  * @author  MCD Application Team
  * @brief   Description of the USB Host HID RTOS example.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under Ultimate Liberty license
  * SLA0044, the "License"; You may not use this file except in compliance with
  * the License. You may obtain a copy of the License at:
  *                             www.st.com/SLA0044
  *
  ******************************************************************************
  @endverbatim

@par Example Description 

Use of the USB host application based on the HID class.

This is a typical example on how to use the STM32F105x/107x USB OTG Host peripheral to interact with an USB 
HID Device such as a Mouse or a Keyboard.

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.

When the application is started, the connected HID device (Mouse/Keyboard) is detected in HID mode and 
gets initialized. The STM32 MCU behaves as a HID Host, it enumerates the device and extracts VID, PID, 
manufacturer name, Serial number and product name information and displays it on the LCD screen. 
This example is based on interacting with a HID device (Mouse/Keyboard). It creates a normal 
priority thread, that executes a HID routine.

A menu is displayed and the user can select any operation from the menu using the Joystick buttons:
 - "Start HID" operation starts the appropriate HID application to the attached HID Device.
   - "Start Mouse / Re-Initialize" operation starts Mouse HID example. Moving the mouse will move
    the pointer in the display rectangle and if a button is pressed, the corresponding rectangle will be
    highlighted in Blue.
   - "Start Keyboard / Clear" operation starts Keyboard HID example. Taped Keyboard characters are 
   displayed on the LCD screen.
 - "Re-Enumerate" operation performs a new Enumeration of the device.

@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
      based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
      a peripheral ISR process, then 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.

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

@note In case of using an "AZERTY keyboard", user should add "AZERTY_KEYBOARD" define in the project Preprocessor.

For more details about the STM32Cube USB Host library, please refer to UM1720  
"STM32Cube USB Host library".


It is possible to fine tune needed USB Host features by modifying defines values in USBH configuration
file “usbh_conf.h” available under the project includes directory, in a way to fit the application
requirements, such as:
- Level of debug: USBH_DEBUG_LEVEL
                  0: No debug messages
                  1: Only User messages are shown
                  2: User and Error messages are shown
                  3: All messages and internal debug messages are shown
   By default debug messages are displayed on the debugger IO terminal; to redirect the Library
   messages on the LCD screen, lcd_log.c driver need to be added to the application sources.

Since this is an RTOS based example, built around FreeRTOS and CMSIS-OS wrapping layer common APIs,
the RTOS is enabled by setting, #define USBH_USE_OS      1

@note The FreeRTOS heap size configTOTAL_HEAP_SIZE defined in FreeRTOSConfig.h is set accordingly to the 
      OS resources memory requirements of the application with +10% margin and rounded to the upper Kbyte boundary.

For more details about FreeRTOS implementation on STM32Cube, please refer to UM1722 "Developing Applications 
on STM32Cube with RTOS".

@par Directory contents

  - USB_Host/HID_RTOS/Src/main.c                  Main program
  - USB_Host/HID_RTOS/Src/system_stm32f1xx.c      STM32F1xx system clock configuration file
  - USB_Host/HID_RTOS/Src/stm32f1xx_it.c          Interrupt handlers
  - USB_Host/HID_RTOS/Src/menu.c                  HID State Machine
  - USB_Host/HID_RTOS/Src/usbh_conf.c             General low level driver configuration
  - USB_Host/HID_RTOS/Src/mouse.c                 HID mouse functions file
  - USB_Host/HID_RTOS/Src/keybaord.c              HID keyboard functions file
  - USB_Host/HID_RTOS/Inc/main.h                  Main program header file
  - USB_Host/HID_RTOS/Inc/stm32f1xx_it.h          Interrupt handlers header file
  - USB_Host/HID_RTOS/Inc/lcd_log_conf.h          LCD log configuration file
  - USB_Host/HID_RTOS/Inc/stm32f1xx_hal_conf.h    HAL configuration file
  - USB_Host/HID_RTOS/Inc/usbh_conf.h             USB Host driver Configuration file
  - USB_Host/HID_RTOS/Inc/FreeRTOSConfig.h              FreeRTOS Module Configuration file
 

@par Hardware and Software environment

  - This example runs on STM32F107xx/STM32F105xx devices.
    
  - This example has been tested with STMicroelectronics STM3210C-EVAL RevC 
    evaluation boards and can be easily tailored to any other supported device 
    and development board.

  - STM3210C-EVAL RevC Set-up
    - Plug a USB device mouse or keyboard into the STM3210C-EVAL board 
      through 'USB micro A-Male to A-Female' cable


@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>
 */
