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/**
@page DynamicSwitch_Standalone USB Host Dynamic Switch application
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file USB_Host/DynamicSwitch_Standalone/readme.txt
* @author MCD Application Team
* @brief Description of the USB Host Dynamic Switch application.
******************************************************************************
*
* Copyright (c) 2017 STMicroelectronics. All rights reserved.
*
* 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 Application Description
This application is a part of the USB Host Library package using STM32Cube firmware. It describes how to use
dynamically switch, on the same port, between available USB host applications on the STM32F4xx devices.
The USBH_RegisterClass() API is provided by the USB Host Library to load the class driver. In this
application MSC, HID and AUDIO classes are loaded and the user can start his application depending on the
connected device.
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 168 MHz. The Full Speed (FS) USB module uses
internally a 48-MHz clock, which is generated from an integrated PLL. In the High Speed (HS) mode the
USB clock (60 MHz) is driven by the ULPI.
It's worth noting that the system clock (SYSCLK) can be configured, depending on the used USB Core:
- SYSCLK is set to 168 MHz: for FS Core (FS or HS-IN-FS), because used embedded PHY
requires 48 MHz clock, achieved only when system clock
is set to 168 MHz.
- SYSCLK is set to 180 MHz: for only HS Core, since no embedded PHY is used.
When the application is started, the connected USB device is detected in the appropriate mode
(MSC/HID/AUDIO) and gets initialized. The STM32 MCU behaves as a (MSC/HID/AUDIO) Host, it enumerates the
device and extracts VID, PID, manufacturer name, Serial no and product name information and displays it
on the LCD screen.
A menu is displayed depending on the connected device and the user can select any operation from the
menu using the Joystick buttons.
@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.
For more details about the STM32Cube USB Host library, please refer to UM1720
"STM32Cube USB Host library".
@par USB Library Configuration
To select the appropriate USB Core to work with, user must add the following macro defines within the
compiler preprocessor (already done in the preconfigured projects provided with this application):
- "USE_USB_HS" when using USB High Speed (HS) Core
- "USE_USB_FS" when using USB Full Speed (FS) Core
- "USE_USB_HS" and "USE_USB_HS_IN_FS" when using USB High Speed (HS) Core in FS mode
It is possible to fine tune needed USB Host features by modifying defines values in USBH configuration
file <20>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.
- Number of supported classes: USBH_MAX_NUM_SUPPORTED_CLASS
@par Keywords
Connectivity, USB_Host, MSC, HID, AUDIO, Full-Speed, High-Speed, LCD, SD Card, Mass Storage, FatFS
@par Directory contents
- USB_Host/DynamicSwitch_Standalone/Src/main.c Main program
- USB_Host/DynamicSwitch_Standalone/Src/usbh_diskio_dma.c FatFS usbh diskio driver implementation
- USB_Host/DynamicSwitch_Standalone/Src/sd_diskio.c FatFS sd diskio driver implementation
- USB_Host/DynamicSwitch_Standalone/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
- USB_Host/DynamicSwitch_Standalone/Src/stm32f4xx_it.c Interrupt handlers
- USB_Host/DynamicSwitch_Standalone/Src/menu.c Main Menu State Machine
- USB_Host/DynamicSwitch_Standalone/Src/usbh_conf.c General low level driver configuration
- USB_Host/DynamicSwitch_Standalone/Src/usbh_diskio.c USB diskio interface for FatFs
- USB_Host/DynamicSwitch_Standalone/Src/msc_explorer.c Explore the USB flash disk content
- USB_Host/DynamicSwitch_Standalone/Src/file_operations.c Write/read file on the disk
- USB_Host/DynamicSwitch_Standalone/Src/msc_menu.c MSC State Machine
- USB_Host/DynamicSwitch_Standalone/Src/hid_menu.c HID State Machine
- USB_Host/DynamicSwitch_Standalone/Src/audio_menu.c AUDIO State Machine
- USB_Host/DynamicSwitch_Standalone/Src/audio_explorer.c Explore the uSD content
- USB_Host/DynamicSwitch_Standalone/Src/audio.c Audio Out (playback) interface API
- USB_Host/DynamicSwitch_Standalone/Src/mouse.c HID mouse functions
- USB_Host/DynamicSwitch_Standalone/Src/keyboard.c HID keyboard functions
- USB_Host/DynamicSwitch_Standalone/Inc/main.h Main program header file
- USB_Host/DynamicSwitch_Standalone/Inc/usbh_diskio_dma.h FatFS usbh diskio driver header file
- USB_Host/DynamicSwitch_Standalone/Inc/sd_diskio.h FatFS sd diskio driver header file
- USB_Host/DynamicSwitch_Standalone/Inc/stm32f4xx_it.h Interrupt handlers header file
- USB_Host/DynamicSwitch_Standalone/Inc/lcd_log_conf.h LCD log configuration file
- USB_Host/DynamicSwitch_Standalone/Inc/stm32f4xx_hal_conf.h HAL configuration file
- USB_Host/DynamicSwitch_Standalone/Inc/usbh_conf.h USB Host driver Configuration file
- USB_Host/DynamicSwitch_Standalone/Inc/ffconf.h FAT file system module configuration file
@par Hardware and Software environment
- This application runs on STM32F429xx/STM32F439xx devices.
- This application has been tested with STMicroelectronics STM324x9I-EVAL RevB
evaluation boards and can be easily tailored to any other supported device
and development board.
- STM324x9I-EVAL RevB Set-up
- Insert a microSD card containing .Wav audio file into the STM324x9I-EVAL uSD slot (CN17)
- Plug the USB device into the STM324x9I-EVAL board through 'USB micro A-Male
to A-Female' cable to the connector:
- CN9 : to use USB High Speed (HS) with embedded PHY(U7)
- CN14: to use USB Full Speed (FS)
Please ensure that jumper JP16 is not fitted.
- CN15: to use USB HS-IN-FS.
Note that some FS signals are shared with the HS ULPI bus, so some PCB rework is needed.
For more details, refer to section 2.8 USB OTG2 HS & FS in UM1667
@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
- In the workspace toolbar select the project configuration:
- STM324x9I-EVAL_USBH-HS: to configure the project for STM32F4xx devices using USB OTG HS peripheral
- STM324x9I-EVAL_USBH-FS: to configure the project for STM32F4xx devices using USB OTG FS peripheral
- STM324x9I-EVAL_USBH-HS-IN-FS: to configure the project for STM32F4xx devices and use USB OTG HS
peripheral In FS (using embedded PHY).
- Run the application
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
*/