DESK-MX6UL-L/Peripherals/USB Host
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| DESK-MX6UL-L 3.0.0 release | |||
| 2023/05/04 | DESK-MX6UL-L 4.0.0 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 ULite SOM:
From imx6ul-axelulite-cb003a.dts:
reg_usb_otg1_vbus: regulator@2 {
compatible = "regulator-fixed";
reg = <2>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usb_otg1>;
regulator-name = "usb_otg1_vbus";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
gpio = <&gpio1 18 GPIO_ACTIVE_HIGH>;
enable-active-high;
};
...
...
&usbotg1 {
vbus-supply = <®_usb_otg1_vbus>;
disable-over-current;
dr_mode = "host";
status = "okay";
};
...
...
&iomuxc {
pinctrl-0 = <&pinctrl_hog_gpios>;
imx6ul-axelulite {
...
...
pinctrl_usb_otg1: usbotg1grp {
fsl,pins = <
MX6UL_PAD_UART1_CTS_B__GPIO1_IO18 0x10b0 /* HOST PWR */
MX6UL_PAD_GPIO1_IO03__GPIO1_IO03 0x10b0 /* HOST OC */
>;
};
};
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.)
[ 199.668004] usb 1-1: new high-speed USB device number 2 using ci_hdrc [ 199.876433] usb 1-1: New USB device found, idVendor=13fe, idProduct=6700, bcdDevice= 1.10 [ 199.876545] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 199.876604] usb 1-1: Product: USB DISK 3.0 [ 199.876647] usb 1-1: Manufacturer: Wilk [ 199.876690] usb 1-1: SerialNumber: 07012533C2BE5935 [ 199.897372] usb-storage 1-1:1.0: USB Mass Storage device detected [ 199.918075] scsi host0: usb-storage 1-1:1.0 [ 200.961571] scsi 0:0:0:0: Direct-Access Wilk USB DISK 3.0 PMAP PQ: 0 ANSI: 6 [ 200.976402] sd 0:0:0:0: [sda] 60628992 512-byte logical blocks: (31.0 GB/28.9 GiB) [ 200.977682] sd 0:0:0:0: [sda] Write Protect is off [ 200.977729] sd 0:0:0:0: [sda] Mode Sense: 45 00 00 00 [ 200.989604] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 201.200618] sda: sda1 sda2 [ 201.214974] 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-mx6ul-axelulite:~# mkdir -p /mnt/usbApr root@desk-mx6ul-axelulite:~# mount /dev/sda1 /mnt/usb/ root@desk-mx6ul-axelulite:~# ls -la /mnt/usb/ total 24 drwxr-xr-x 3 root root 4096 Apr 1 14:16 . drwxr-xr-x 4 root root 4096 Apr 3 18:15 .. drwx------ 2 root root 16384 Apr 3 14:16 lost+found -rwxr-xr-x 1 root root 6881192 Apr 3 14:16 uImage
