Introduction

This examples demonstrates the use of TinyUSB DFU DEV Class driver. Its implements all the necessary callbacks that are required by TinyUSB DFU DEV class driver.
When user issues DFU download command then the application receives the data in a static buffer via USB DFU. Once the manifest state is completed the application sends the received data back to UART0.
When user issues DFU Upload command it sends the **"Hello world from AM64x-AM243x DFU! - Partition 0"** string back to the HOST PC.
refer USB2.0 DFU specs to konw more about USB 2.0 DFU class.

Note: The max buffer size is 4KB thus, as far as this example is concerned user can send at max 4KB of data.

To enable USB Logging for this example refer USB CDC Echo Example

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0_nortos
Toolchain	ti-arm-clang
Boards	am243x-evm, am243x-lp
Example folder	examples/usb/device/dfu

Steps to Run the Example

Build the example

When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)

HW Setup

AM243X-EVM

To test the application, one can use a Windows/Linux PC as a USB host
Connect the J24 on AM64x/AM243x EVM to the USB host

USB 2.0 Host/Device Connector

AM243X-LP

To test the application, one can use a Windows/Linux PC as a USB host
Connect the J10 on AM243x LP to the USB host
USB2.0 is validated from Type C connector

Note

The am243x-LP board is powered by the same J10 connector. It requires USB-type C port that has power delivery classification.

Thunderbolt
Battery behind USB logo. refer am243x-LP User Guide

USB Type-C Host/Device Connector

Run the example

Launch a CCS debug session and run the executable, see CCS Launch, Load and Run
When the application is running. Observer DFU device detected on HOST PC.
Open cmd in windows and terminal in case of Linux. Run Following command to detect whether the DFU device has been enumerated or not.

Windows
```
dfu-util -l 
```
Linux
```
sudo dfu-util -l 
```
If the enumeration is successful the following should be displayed on console.

AM64x-AM243x DFU Device detected.

If the DFU device is not detected then most probably the WinUSB driver is not installed.
refer "Install steps for dfu-util tools(windows)" in Download, Install and Setup SDK and Tools

DFU Download

Open COM port in windows and /dev/ttyUSBx in linux which opens console for UART0.

Once the DFU device is enumerated run the following command.

Windows

dfu-util -a 0 -i 0 -D test_data.txt

Linux

sudo dfu-util -a 0 -i 0 -D test_data.txt

The test_data.txt file contains a string data that is to be transfered.
Once the DFU transfer is completed following will be displayed on the terminal.

DFU Download command successful

Open UART0 serial port to observe the content of test_data.txt file displayed on same serial port.

Content of received file displayed on serial port.

DFU Upload

Run the following command to read the data from DFU device.