DESK-MX6-L/Pheripherals/USB Host
< DESK-MX6-L
Revision as of 14:22, 16 July 2021 by U0009 (talk | contribs) (U0009 moved page AXEL Lite SOM/DESK-MX6-L/Pheripherals/USB Host to DESK-MX6-L/Pheripherals/USB Host: modifica gestione DESK come prodotto a se stante)
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Contents
Peripheral USB Host[edit | edit source]
The USB Host port requires to configure the USB VBUS regulator and the gpio used for enabling the 5V USB power switch.
Device tree configuration[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the AXEL Lite SOM:
From imx6qdl-axelcommon.dtsi:
regulators {
compatible = "simple-bus";
reg_usb_h1_vbus: usb_h1_vbus {
compatible = "regulator-fixed";
regulator-name = "usb_h1_vbus";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
gpio = <&gpio2 11 0>;
enable-active-high;
};
};
...
...
&usbh1 {
vbus-supply = <®_usb_h1_vbus>;
status = "okay";
};
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
When a USB peripheral is inserted, in the following example a memory mass storage device, the kernel recognizes the device (i.e. xlass, vendor id, product id, etc.)
root@desk-mx6:~# [ 635.250658] usb 1-1: new high-speed USB device number 3 using ci_hdrc [ 635.452905] usb 1-1: New USB device found, idVendor=18a5, idProduct=0302 [ 635.459662] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 635.468681] usb 1-1: Product: STORE N GO [ 635.473596] usb 1-1: Manufacturer: Verbatim [ 635.477809] usb 1-1: SerialNumber: CCYYMMDDHHmmSSNUFLQ9 [ 635.491337] usb-storage 1-1:1.0: USB Mass Storage device detected [ 635.497852] scsi host0: usb-storage 1-1:1.0 [ 638.418581] scsi 0:0:0:0: Direct-Access Verbatim STORE N GO 1100 PQ: 0 ANSI: 4 [ 638.429992] sd 0:0:0:0: [sda] 61069312 512-byte logical blocks: (31.3 GB/29.1 GiB) [ 638.444695] sd 0:0:0:0: [sda] Write Protect is off [ 638.453430] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 638.473696] sda: sda1 [ 638.481431] sd 0:0:0:0: [sda] Attached SCSI removable disk root@desk-mx6:~#
Additional information[edit | edit source]
If the root file system configuration does not automatically mount the partition, it is possible to mount the device using the following command:
root@desk-mx6:~# mkdir -p /mnt/usb root@desk-mx6:~# mount /dev/sda1 /mnt/usb [ 831.081734] FAT-fs (sda1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck. root@desk-mx6:~# ls -la /mnt/usb total 6756 drwxr-xr-x 3 root root 16384 Jan 1 1970 . drwxr-xr-x 4 root root 4096 Oct 7 16:33 .. drwxr-xr-x 2 root root 16384 Feb 26 2020 System Volume Information -rwxr-xr-x 1 root root 6881192 Mar 31 2020 uImage-4.14.98-xelk-5.0.0-rc2+gb0960b6 root@desk-mx6:~#
