Revision as of 15:33, 25 June 2008

How-To use the USB Host functionnality of Armadeus boards under Linux.

Controller

To use USB devices on your Armadeus board, you will need to have a USB Host controller on your development board. Currently, only the DevFull has this functionnality. It is equipped with a USB 2.0 Host controller featuring three USB high speed ports.

To know how to install USB Host Linux driver for the DevFull, go here.

Using USB devices

USB keyboard/mouse (HID: Human Interface Device)

Driver installation

Adding USB keyboard support

$ make linux-menuconfig

select Device Drivers ---> [*] HID Devices  ---> <*>   Generic HID support  (static)
select Device Drivers ---> [*] HID Devices  ---> <M>   USB Human Interface Device (full HID) support  (module)

Starting the driver

# modprobe usbhid

Plug the keyboard

• you should see on console:

usb 1-1.1: new low speed USB device using isp1761 and address 3
usb 1-1.1: configuration #1 chosen from 1 choice
input: NOVATEK USB Keyboard as /class/input/input0
input: USB HID v1.10 Keyboard [NOVATEK USB Keyboard] on usb-platform-1.1
input: NOVATEK USB Keyboard as /class/input/input1
input: USB HID v1.10 Mouse [NOVATEK USB Keyboard] on usb-platform-1.1

Plug the mouse

• you should see on console:

usb 1-1.2: new low speed USB device using isp1761 and address 6
usb 1-1.2: configuration #1 chosen from 1 choice
input: Logitech USB-PS/2 Optical Mouse as /class/input/input6
input: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-platform-1.2

USB Flash memory / USB key

Driver installation

Adding USB Flash support

$ make linux-menuconfig

select Device Drivers  ---> SCSI device support  ---> <*> SCSI device support         (static)
select Device Drivers  ---> SCSI device support  ---> [*] legacy /proc/scsi/ support  (static)
select Device Drivers  ---> SCSI device support  ---> <*> SCSI disk support           (static)

select Device Drivers  ---> [*] USB support  ---> [*]   USB device filesystem     (static)
select Device Drivers  ---> [*] USB support  ---> <*>   USB Mass Storage support  (static)

Starting the driver

• if sda1 has not been previoulsy created

# mknod /dev/sda1 b 8 1

• create a mount directory "memstick"

# mkdir -m 777 /mnt/memstick

• mount the USB Flash device

# mount -t vfat /dev/sda1 /mnt/memstick

• check what is present on the USB Flash device

# ls -al /mnt/memstick

USB Performances

A performance test has been performed by means of the usb_perf.sh script.
A high speed USB stick (corsair memory flash voyager) has been used.

Test result (mean values): read -> 2980 kBytes/sec   write -> 2095 kBytes/sec

The maximal bandwidth has been also measured by using a scope and by tranferring 4096 octets from the USBstick to a buffer of a kernel driver

Result: ~10Mo/sec  

Links

• http://www.nxp.com/acrobat/datasheets/ISP1760_4.pdf
• http://www.nxp.com/acrobat_download/datasheets/ISP1761_4.pdf