USB Host
From ArmadeusWiki
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.
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
Starting the driver
- If /dev/sda1 does not exist, then create it:
# mknod /dev/sda1 b 8 1
- Create a mount directory "usbdisk"
# mkdir -m 777 /mnt/usbdisk
- 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
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
