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/**
@page CDC_Standalone USB Host Communication Class (CDC) application
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file USB_Host/CDC_Standalone/readme.txt
* @author MCD Application Team
* @brief Description of the USB Host CDC application.
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2017 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:
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* this list of conditions and the following disclaimer.
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* 4. This software, including modifications and/or derivative works of this
* software, must execute solely and exclusively on microcontroller or
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*
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******************************************************************************
@endverbatim
@par Application Description
This application shows how to use the USB host application based on the Communication Class (CDC) on the STM32F4xx devices.
This is a typical application on how to use the STM32F4xx USB OTG Host peripheral to operate with an USB
CDC device application based on the two CDC transfer directions with a dynamic serial configuration:
- Transmission:
The user can select in the Host board, using the menu, a file among the ones
available on the SD and send it to the Device board. The content of the file could be visualized
through the Hyperterminal (the link configuration is imposed initially by the device and could be
checked using the configuration menu). Data to be transmitted is stored in CDC_TX_Buffer buffer.
- Reception:
The data entered by the user using the Hyperterminal in ASCII format are transferred by the device
board to the Host board and displayed on its LCD screen. The CDC_RX_Buffer is the buffer used for
data reception.
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 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 CDC device is detected in CDC mode and gets
initialized. The STM32 MCU behaves as a CDC 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 and the user can select any operation from the menu using the Joystick buttons:
- "Send Data" operation starts the Data Transmission.
- "Receive Data" operation starts the Data Reception.
- "Configuration" operation defines the desired Host CDC configuration (Baudrate,Parity, DataBit and StopBit)
The baudrate comes with a default value of 115,2 kbps (BAUDRATE = 115200).
- "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.
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
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.
@par Directory contents
- USB_Host/CDC_Standalone/Src/main.c Main program
- USB_Host/CDC_Standalone/Src/sd_diskio.c FatFS sd diskio driver implementation
- USB_Host/CDC_Standalone/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
- USB_Host/CDC_Standalone/Src/stm32f4xx_it.c Interrupt handlers
- USB_Host/CDC_Standalone/Src/menu.c CDC State Machine
- USB_Host/CDC_Standalone/Src/usbh_conf.c General low level driver configuration
- USB_Host/CDC_Standalone/Src/explorer.c Explore the uSD content
- USB_Host/CDC_Standalone/Src/cdc_configuration.c CDC settings State Machine
- USB_Host/CDC_Standalone/Src/cdc_receive.c CDC Receive State Machine
- USB_Host/CDC_Standalone/Src/cdc_send.c CDC Send State Machine
- USB_Host/CDC_Standalone/Inc/main.h Main program header file
- USB_Host/CDC_Standalone/Inc/sd_diskio.h FatFS sd diskio driver header file
- USB_Host/CDC_Standalone/Inc/stm32f4xx_it.h Interrupt handlers header file
- USB_Host/CDC_Standalone/Inc/lcd_log_conf.h LCD log configuration file
- USB_Host/CDC_Standalone/Inc/stm32f4xx_hal_conf.h HAL configuration file
- USB_Host/CDC_Standalone/Inc/usbh_conf.h USB Host driver Configuration file
- USB_Host/CDC_Standalone/Inc/ffconf.h FAT file system module configuration file
@par Hardware and Software environment
- This application runs on STM32F407xx/STM32F417xx devices.
- This application has been tested with STMicroelectronics STM324xG-EVAL RevC
evaluation boards and can be easily tailored to any other supported device
and development board.
- STM324xG-EVAL RevC Set-up
- Insert a microSD card into the STM324xG-EVAL uSD slot (CN6)
- Plug the CDC device into the STM324xG-EVAL board through 'USB micro A-Male
to B-Male' cable to the connector:
- CN9: to use USB High Speed (HS) with embedded PHY(U8)
Please ensure that jumper JP31 is fitted.
- CN8: to use USB Full Speed (FS)
Please ensure that jumpers JP16 and JP22 are in position 1-2.
@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:
- STM324xG-EVAL_USBH-HS: to configure the project for STM32F4xx devices using USB OTG HS peripheral
- STM324xG-EVAL_USBH-FS: to configure the project for STM32F4xx devices using USB OTG FS peripheral
- STM324xG-EVAL_USBH-HS-IN-FS: to configure the project for STM32F4xx devices using USB OTG HS peripheral In FS (using embedded PHY)
- Run the application
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
*/