Difference between revisions of "USB Host"

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* Mount the USB Mass Storage device
 
* Mount the USB Mass Storage device
 
  # mount -t vfat /dev/sda1 /mnt/usbdisk
 
  # mount -t vfat /dev/sda1 /mnt/usbdisk
* Check what is present on the USB Mass Storage device
+
* Check what is present on the USB Mass Storage device:
 
  # ls -al /mnt/usbdisk
 
  # ls -al /mnt/usbdisk
 +
* And if it is well mounted (for example):
 +
# mount
 +
rootfs on / type rootfs (rw)
 +
/dev/root on / type jffs2 (rw)
 +
proc on /proc type proc (rw)
 +
devpts on /dev/pts type devpts (rw)
 +
tmpfs on /tmp type tmpfs (rw)
 +
sysfs on /sys type sysfs (rw)
 +
/dev/sda1 on /mnt/usbdisk type msdos (rw,fmask=0022,dmask=0022,codepage=cp437)
  
 
= USB Performances =
 
= USB Performances =

Revision as of 18:52, 29 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.

Using USB devices

USB keyboard/mouse (HID: Human Interface Device)

Driver installation

  • Add USB keyboard/mouse support in Linux:
$ 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 (for example):
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
  • To change keyboard keymap (by default us one):
# loadkmap < /etc/i18n/fr.kmap

Plug the mouse

  • you should see on console (for example):
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 / USB card reader / USB Hard Drive

Driver installation

  • Add USB Flash support in Linux:
$ 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)

Plug the device

  • You should see (for example):
usb 1-1.2: new high speed USB device using isp1761 and address 6
usb 1-1.2: configuration #1 chosen from 1 choice
scsi0 : SCSI emulation for USB Mass Storage devices
usb 1-1.2: reset high speed USB device using isp1761 and address 6
scsi 0:0:0:0: Direct-Access     Hama     Card Reader   CF 1.9C PQ: 0 ANSI: 0 CCS
sd 0:0:0:0: [sda] Attached SCSI removable disk

Additional configuration

  • If /dev/sdaX does not exist, then create it:
# mknod /dev/sda b 8 0
# mknod /dev/sda1 b 8 1
# mknod /dev/sda2 b 8 2
  • Create a mount directory "usbdisk"
# mkdir -m 777 /mnt/usbdisk

Mount the device

  • Mount the USB Mass Storage device
# mount -t vfat /dev/sda1 /mnt/usbdisk
  • Check what is present on the USB Mass Storage device:
# ls -al /mnt/usbdisk
  • And if it is well mounted (for example):
# mount
rootfs on / type rootfs (rw)
/dev/root on / type jffs2 (rw)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw)
tmpfs on /tmp type tmpfs (rw)
sysfs on /sys type sysfs (rw)
/dev/sda1 on /mnt/usbdisk type msdos (rw,fmask=0022,dmask=0022,codepage=cp437)

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