DESK-MX6-L/Pheripherals/USB Host
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| 16/07/2021 | First DESK release | ||
| 03/03/2022 | DESK 3.0.0 release | ||
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.)
[ 293.085612] usb 1-1: new high-speed USB device number 2 using ci_hdrc [ 293.287458] usb 1-1: New USB device found, idVendor=0781, idProduct=5591, bcdDevice= 1.00 [ 293.287490] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 293.287509] usb 1-1: Product: SanDisk 3.2Gen1 [ 293.287525] usb 1-1: Manufacturer: USB [ 293.287541] usb 1-1: SerialNumber: 03017128082020175157 [ 293.289195] usb-storage 1-1:1.0: USB Mass Storage device detected [ 293.302275] scsi host0: usb-storage 1-1:1.0 [ 294.376862] scsi 0:0:0:0: Direct-Access USB SanDisk 3.2Gen1 1.00 PQ: 0 ANSI: 6 [ 294.379701] sd 0:0:0:0: [sda] 30031872 512-byte logical blocks: (15.4 GB/14.3 GiB) [ 294.381105] sd 0:0:0:0: [sda] Write Protect is off [ 294.381122] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00 [ 294.381838] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 294.439432] sda: sda1 [ 294.446425] sd 0:0:0:0: [sda] Attached SCSI removable disk
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/ root@desk-mx6:~# ls -la /mnt/usb/ total 24 drwxr-xr-x 3 root root 4096 Feb 24 14:16 . drwxr-xr-x 5 root root 4096 Feb 27 15:41 .. drwx------ 2 root root 16384 Feb 24 14:16 lost+found -rwxr-xr-x 1 root root 6881192 Feb 24 14:16 uImage
