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USB Mice & Keyboards

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jlackey

213 Posts

Posted - 14 Aug 2003 : 13:02:13

USB Host Controller

Except for the GraphicsClient+, all our boards include a USB host controller to communicate with USB devices.

The linux kernel interacts with the host controller using a host controller driver. For many of our boards, this driver is included in the kernel source code. The driver can be built into the kernel by enabling the following configuration options using 'make menuconfig':

The AGX uses a different host controller and requires a module, instead. Check Linux Downloads and Documents for availability.

USB Human Interface Devices (HID)

To support USB mice and keyboards, a couple of other options also need to be enabled:

This ties USB mice and keyboards to the Input Device Interface. The Input Device Interface is enabled with these options:

All these options are enabled by default in the latest version of the linux kernel (and most older versions, too). The precompiled kernels also have these options enabled.

Using a USB Mouse

To use a USB mouse, you'll need a device node in your root file system. The node for mouse input devices can be created using:

mknod /dev/input/mice c 13 63This node already exists in our ramdisk.

You can test the mouse using:

cat /dev/input/miceIf you get "garbage" characters on the console when you wiggle the mouse, it works.

You can use gpm with the following options:

gpm -t ps2 -m /dev/input/mice
Using a USB Keyboard

You can use a USB keyboard to provide input to a console on the LCD by running:

getty 38400 tty1 &

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