Gadget Serial Driver



< USB Gadget
  • 1USB serial gadget

Now Browse and select Android Gadget CDC Driver and press open. Select the device driver, you went to install for this hardware, select ‘’Android Gadget VCOM Driver’’ Press Next. The Wizard is ready to install your hardware, press next. Windows Security, click the Install this driver software anyway. Now it takes a few minutes.

  1. The Serial Gadget talks to the Linux-USB generic serial driver. This driver supports a CDC-ACM module option, which can be used to interoperate with MS-Windows hosts or with the Linux-USB cdc-acm driver.
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This gadget allows your devices act as a serial port device. The gadget serial driver talks over USB to either a CDC ACM driver or a generic USB serial driver running on a host PC. This guide demonstrates a way to use the gadget driver as a poor man's serial port debugging tool. One downside of this approach is that the driver does not activate immediately when booting the kernel. The early boot messages (bootloader, kernel) will not be printed via this serial device, but the kernel messages can be accessed e.g. via 'dmesg' in case the system is able to boot to the command prompt.

Kernel support

Currently, the g_serial module is not compiled as part of default kernel configuration. Here we assume the user wants to compile the support in the kernel, not as a module

Make sure you use the dual role mode for MUSB unless the device tree configuration has been updated accordingly. Otherwise the system might fail to set up the device, complaining about an invalid or missing 'dr_mode' property.

You can now continue following manual build howto to continue kernel compilation and installation.

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Preparing the gadget device

The serial device shows up as /dev/ttyGS0 on the gadget device. You can redirect kernel messages to this device by changing the kernel command line:

In case the host machine runs Linux, the serial device might show up as /dev/ttyACM0 or something similar. You can use minicom to communicate with the gadget device:

See also

Some experiments with USB serial gadget here https://forum.armbian.com/index.php/topic/1735-tutorial-use-armbian-to-set-up-rpi-zero-for-g-serial-connection/

Retrieved from 'http://linux-sunxi.org/index.php?title=USB_Gadget/Serial&oldid=20533'
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  • 2Audio Gadget Driver 1.0

This document explains how to enable and use the audio gadget driver, this driver allows to use you board as a audio gadget device for either to work as a audio capture device such as a microphone or to work as an audio receiver device such as speakers.

This driver comes by default into the kernel and is compatible with the USB Audio Class specification 1.0. The current driver allows audio playback mode only and comes wired to the sound system so it automatically uses the default audio decoder to reproduce the audio that is coming from the host machine.

Enabling the audio gadget driver

1. Go to you SDK and open the configuration window make config

2. Go to

and activate the Inventra Highspeed Dual Role Controller (TI, ADI, ..) option to be built in the kernel (press space util it shows a * symbol on it).

Once you have selected it you have to change the Driver Mode option to USB Peripheral (gadget stack).

3. Now activate the USB Gadget Support option (check it as built in the kernel) on

4. Go to

and change the USB Peripheral Controller option to Inventra HDRC USB Peripheral (TI, ADI, ..).

5. Activate the USB Gadget Drivers option as a module (M) in

6. Activate the Audio Gadget (EXPERIMENTAL) option as a module (M) in

7. Save the changes and exit from the configuration window.

8. Built your SDK (make).

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Using the audio gadget driver

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Once you have built the driver it is ready to be used. In this example we are using the LeopardBoard DM368. Before start your board you need to change its jumper configuration to device mode instead of host mode, you can do that by removing the jumper J1 and installing jumper between Pin1 and Pin2 on J4.

Gadget

After booting up the board you can see the following output

High definition audio device install. This package installs the software (Realtek audio driver) to enable the following device. Realtek High Definition Audio DriverApplicable for T430, T430i, T430s, T430si, T530, T530i, W530, X230, X230i, X230 Tablet, X230i Tablet, X1 Carbon. This download provides the Realtek. High Definition Audio Driver for the 3.5mm audio jack on the Intel® NUC Kits NUC8i7HxKx. This audio driver is required if you plan to connect a microphone or headset to the audio jack or want to use the TOSLINK connection on the back of the Intel NUC. Not sure if this is the right driver for your Intel® NUC?

Driver

Then in the board's terminal you must load the audio gadget module by running the following command

If everything is fine you will see an output like this

This way the module has been loaded and the driver is ready to be used. In order to test it you can connect the board to a PC using a USB cable and send an audio streaming to the board.

Once you have connected the board to the PC you can see if it was recognized correctly by running the following command:

the you will get an output like this

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Gadget Serial Driver For Android

So you can see that the board as been detected as a Linux USB Audio Gadget with ID 1. Now we can playback an audio file using the audio gadget device by running the following command:

Be aware that you must use the same hardware ID we got for the gadget device. After that you will be able to hear the audio content in your board's audio output.

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