USB Host

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.

• With an APF9328, 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
• On APF27 all the development boards will have at least 2 USB hosts (controllers are integrated in the i.MX27 processor).

Using USB devices

USB keyboard/mouse (HID: Human Interface Device)

Driver installation

• Add USB keyboard/mouse support in Linux:

$ make linux26-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 linux26-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 <--> Serial adapters

• See USB_to_serial_adapter

USB <--> WiFi adapters

• See USB_to_WiFi_adapter

Links

• Any links ?