123 lines
6.2 KiB
Plaintext
123 lines
6.2 KiB
Plaintext
/**
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@page CDC_Standalone USB Host Communication Class (CDC) example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file USB_Host/CDC_Standalone/readme.txt
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* @author MCD Application Team
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* @brief Description of the USB Host CDC example.
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under Ultimate Liberty license
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* SLA0044, the "License"; You may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* www.st.com/SLA0044
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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Use of the USB host application based on the CDC class.
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This is a typical example on how to use the STM32F10x USB OTG Host peripheral to operate with an USB
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CDC device application based on the two CDC transfer directions with a dynamic serial configuration:
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- Transmission:
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The user can select in the Host board, using the menu, a file among the ones
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available on the SD and send it to the Device board. The content of the file could be visualized
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through the Hyperterminal (the link configuration is imposed initially by the device and could be
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checked using the configuration menu). Data to be transmitted is stored in CDC_TX_Buffer buffer.
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- Reception:
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The data entered by the user using the Hyperterminal in ASCII format are transferred by the device
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board to the Host board and displayed on its LCD screen. The CDC_RX_Buffer is the buffer used for
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data reception.
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At the beginning of the main program the HAL_Init() function is called to reset all the peripherals,
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initialize the Flash interface and the systick. The user is provided with the SystemClock_Config()
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function to configure the system clock (SYSCLK) to run at 72 MHz. The Full Speed (FS) USB module uses
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internally a 48-MHz clock, which is generated from an integrated PLL.
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When the application is started, the connected USB CDC device is detected in CDC mode and gets
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initialized. The STM32 MCU behaves as a CDC Host, it enumerates the device and extracts VID, PID,
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manufacturer name, Serial no and product name information and displays it on the LCD screen.
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A menu is displayed and the user can select any operation from the menu using the Joystick buttons:
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- "Send Data" operation starts the Data Transmission.
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- "Receive Data" operation starts the Data Reception.
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- "Configuration" operation defines the desired Host CDC configuration (Baudrate,Parity, DataBit and StopBit)
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The baudrate comes with a default value of 115,2 kbps (BAUDRATE = 115200).
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- "Re-Enumerate" operation performs a new Enumeration of the device.
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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For more details about the STM32Cube USB Host library, please refer to UM1720
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"STM32Cube USB Host library".
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It is possible to fine tune needed USB Host features by modifying defines values in USBH configuration
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file <20>usbh_conf.h<> available under the project includes directory, in a way to fit the application
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requirements, such as:
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- Level of debug: USBH_DEBUG_LEVEL
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0: No debug messages
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1: Only User messages are shown
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2: User and Error messages are shown
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3: All messages and internal debug messages are shown
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By default debug messages are displayed on the debugger IO terminal; to redirect the Library
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messages on the LCD screen, lcd_log.c driver need to be added to the application sources.
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@par Directory contents
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- USB_Host/CDC_Standalone/Src/main.c Main program
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- USB_Host/CDC_Standalone/Src/system_stm32f1xx.c STM32F10x system clock configuration file
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- USB_Host/CDC_Standalone/Src/stm32f1xx_it.c Interrupt handlers
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- USB_Host/CDC_Standalone/Src/menu.c CDC State Machine
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- USB_Host/CDC_Standalone/Src/usbh_conf.c General low level driver configuration
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- USB_Host/CDC_Standalone/Src/explorer.c Explore the uSD content
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- USB_Host/CDC_Standalone/Src/cdc_configuration.c CDC settings State Machine
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- USB_Host/CDC_Standalone/Src/cdc_receive.c CDC Receive State Machine
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- USB_Host/CDC_Standalone/Src/cdc_send.c CDC Send State Machine
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- USB_Host/CDC_Standalone/Inc/main.h Main program header file
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- USB_Host/CDC_Standalone/Inc/stm32f1xx_it.h Interrupt handlers header file
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- USB_Host/CDC_Standalone/Inc/lcd_log_conf.h LCD log configuration file
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- USB_Host/CDC_Standalone/Inc/stm32f1xx_hal_conf.h HAL configuration file
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- USB_Host/CDC_Standalone/Inc/usbh_conf.h USB Host driver Configuration file
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- USB_Host/CDC_Standalone/Inc/ffconf.h FatFs Module Configuration file
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@par Hardware and Software environment
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- This example runs on STM32F107xx devices.
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- This example has been tested with STMicroelectronics STM3210C-EVAL RevC
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evaluation boards and can be easily tailored to any other supported device
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and development board.
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- STM3210C-EVAL RevC Set-up
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- Insert a microSD card into the STM3210C-EVAL uSD slot (CN16)
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- Plug the CDC device into the STM3210C-EVAL board through 'USB micro A-Male
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to B-Male' cable to the connector CN2.
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the example
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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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