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  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2How to Install
    1. 2.1 Update the FreeRTOS Version in the TivaWare Directory
    2. 2.2 Adding FreeRTOS Hardware Driver Files for TM4C LaunchPads
  5. 3Architecture for TM4C FreeRTOS Examples
    1. 3.1 Proper Clock Configuration
    2. 3.2 How to use Hardware Interrupts Alongside the FreeRTOS Kernel
    3. 3.3 Code Composer Studio Debug Support for FreeRTOS
  6. 4Example Project Walkthroughs
    1. 4.1 Download and Import the Examples
    2. 4.2 USB Examples
      1. 4.2.1 usb_dev_bulk
      2. 4.2.2 usb_dev_cdcserial
      3. 4.2.3 usb_dev_keyboard
    3. 4.3 Ethernet Examples
      1. 4.3.1 enet_lwip
        1. 4.3.1.1 Running enet_lwip Example
      2. 4.3.2 enet_io
        1. 4.3.2.1 Running enet_io Example
  7. 5References

4.2.1 usb_dev_bulk

This example configures the USB peripheral to function as a USB device in bulk mode. In order to observe USB bulk transfers, an additional program is needed which communicates with USB bulk devices. A USB bulk example program is provided as part of TivaWare and can be downloaded from the SW-TM4C tool page. The software package to install the USB bulk example program is titled SW-USB-win-2.2.0.295.msi. After installing the program, navigate to the installation folder and find usb_bulk_example.exe. On opening, the application looks to connect to a TM4C USB device, so have the usb_dev_bulk example project loaded and running before starting the demo application.

In this example, only one task is created to handle the USB bulk data transfers. A counting semaphore is used to allow the USB handler to indicate when data has been received through the bulk interface. Once data is received, the task is unblocked and it will read out the received data and then echo it back over USB bulk while inverting the casing of any letters. When used with the usb_bulk_examples.exe program, data sent will be displayed in 255 byte packets as that is the maximum size of individual USB bulk packets under the USB 2.0 Full Speed standard. Messages larger than 255 bytes can be sent, and will be received across multiple returned packets.