USB Host
From ArmadeusWiki
Revision as of 12:07, 21 June 2008 by JulienB (Talk | contribs) (Split Host specific stuff to dedicated page)
How-To use the USB Host functionnality of Armadeus boards under Linux.
Contents
Controller
- 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
Driver installation
Adding USB keyboard support
make linux-menuconfig select Device Driver->HID Devices-> Generic HID support (kernel)
select Device Driver->HID Devices-> USB Human Interface Device (module)
Starting the driver
modprobe usbhid
USB Flash memory / USB key
Driver installation
Adding USB Flash support
make linux-menuconfig select Device Driver-> SCSI device support->SCSI device support (kernel)
select Device Driver-> SCSI device support->legacy /proc/scsi/ support (kernel)
select Device Driver-> SCSI device support->SCSI disk support (kernel)
select Device Driver-> USB support ->USB device filesystem (kernel)
select Device Driver-> USB support ->USB Mass Storage support (kernel)
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
