DESK-MP1-L/Peripherals/USB Host
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| 2023/08/02 | DESK-MP1-L-1.0.0 release | ||
Contents
Peripheral USB Host[edit | edit source]
Device tree configuration[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the ETRA SOM:
From kernel device tree stm32mp157a-dcsb5000dd1r.dts:
...
...
&usbh_ehci{
status = "okay";
/* USER CODE BEGIN usbh_ehci */
phys = <&usbphyc_port0>;
phy-names = "usb";
/* USER CODE END usbh_ehci */
};
&usbh_ohci{
status = "okay";
/* USER CODE BEGIN usbh_ohci */
/* USER CODE END usbh_ohci */
};
&usbphyc{
status = "okay";
/* USER CODE BEGIN usbphyc */
/* USER CODE END usbphyc */
};
&usbphyc_port0{
status = "okay";
/* USER CODE BEGIN usbphyc_port0 */
phy-supply = <&vdd_usb>;
connector {
compatible = "usb-a-connector";
vbus-supply = <&vbus_sw>;
};
/* USER CODE END usbphyc_port0 */
};
...
...
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.)
[ 496.159495] usb 2-1: new high-speed USB device number 2 using ehci-platform [ 496.368878] usb-storage 2-1:1.0: USB Mass Storage device detected [ 496.379336] scsi host0: usb-storage 2-1:1.0 [ 496.846840] usbcore: registered new interface driver uas [ 497.441374] scsi 0:0:0:0: Direct-Access USB SanDisk 3.2Gen1 1.00 PQ: 0 ANSI: 6 [ 497.453487] sd 0:0:0:0: [sda] 60125184 512-byte logical blocks: (30.8 GB/28.7 GiB) [ 497.461344] sd 0:0:0:0: [sda] Write Protect is off [ 497.464745] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00 [ 497.472234] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 497.488444] sd 0:0:0:0: Attached scsi generic sg0 type 0 [ 497.507380] sda: sda1 [ 497.603592] 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-mp1:~# mkdir -p /mnt/usb root@desk-mp1:~# mount /dev/sda1 /mnt/usb/ root@desk-mp1:~# ls -la /mnt/usb/ total 24 drwxr-xr-x 3 root root 16384 Jan 1 1970 . drwxr-xr-x 4 root root 4096 Jul 28 13:38 .. drwx------ 2 root root 16384 Jul 28 08:54 lost+found -rw-r--r-- 1 root root 8765832 Jul 28 08:54 uImage
