Difference between revisions of "DESK-MX8M-L/Peripherals/USB1 OTG"
| Line 80: | Line 80: | ||
</pre> | </pre> | ||
| − | ===Accessing the peripheral=== | + | ===Accessing the peripheral MITO 8M Mini=== |
| − | |||
| − | |||
====Linux messages at boot time==== | ====Linux messages at boot time==== | ||
| Line 97: | Line 95: | ||
<pre class="workstation-terminal"> | <pre class="workstation-terminal"> | ||
| − | root@desk- | + | root@desk-mx8mm:~# dd if=/dev/zero of=mass_storage count=256 bs=1M |
256+0 records in | 256+0 records in | ||
256+0 records out | 256+0 records out | ||
| Line 103: | Line 101: | ||
root@desk-mx8mp:~# mkfs.msdos mass_storage | root@desk-mx8mp:~# mkfs.msdos mass_storage | ||
mkfs.fat 4.1 (2017-01-24) | mkfs.fat 4.1 (2017-01-24) | ||
| − | root@desk- | + | root@desk-mx8mm:~# mkdir loop |
| − | root@desk- | + | root@desk-mx8mm:~# mount -o loop mass_storage loop |
| − | root@desk- | + | root@desk-mx8mm:~# echo "Test USB OTG with mass storage device" > loop/usb.txt |
| − | root@desk- | + | root@desk-mx8mm:~# umount loop |
| − | root@desk- | + | root@desk-mx8mm:~# |
</pre> | </pre> | ||
Revision as of 14:08, 16 February 2023
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| 2.0.0 | Feb 2023 | DESK-MX8M-L-2.0.0 | |
Contents
Peripheral USB OTG[edit | edit source]
Device tree configuration[edit | edit source]
ORCA SOM[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the ORCA SOM:
From imx8mp-mito8mplus-cb1001.dts:
...
...
&usb3_phy0 {
vbus-power-supply = <&ptn5110>;
fsl,phy-tx-vref-tune = <6>;
fsl,phy-tx-rise-tune = <0>;
fsl,phy-tx-preemp-amp-tune = <3>;
fsl,phy-comp-dis-tune = <7>;
fsl,pcs-tx-deemph-3p5db = <0x21>;
fsl,phy-pcs-tx-swing-full = <0x7f>;
status = "okay";
};
&usb3_0 {
status = "okay";
};
&usb_dwc3_0 {
dr_mode = "host";
status = "okay";
port {
usb3_drd_sw: endpoint {
remote-endpoint = <&typec_dr_sw>;
};
};
};
MITO 8M Mini[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the MITO 8M Mini:
From imx8mm-mito8mmini.dts:
&usbotg1 {
dr_mode = "otg";
picophy,pre-emp-curr-control = <3>;
picophy,dc-vol-level-adjust = <7>;
disable-over-current;
srp-disable;
hnp-disable;
adp-disable;
status = "okay";
};
Accessing the peripheral MITO 8M Mini[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 4.954820] usb_otg_vbus: disabling ... ...
Usage with mass-storage[edit | edit source]
root@desk-mx8mm:~# dd if=/dev/zero of=mass_storage count=256 bs=1M 256+0 records in 256+0 records out 268435456 bytes (268 MB, 256 MiB) copied, 0.844688 s, 318 MB/s root@desk-mx8mp:~# mkfs.msdos mass_storage mkfs.fat 4.1 (2017-01-24) root@desk-mx8mm:~# mkdir loop root@desk-mx8mm:~# mount -o loop mass_storage loop root@desk-mx8mm:~# echo "Test USB OTG with mass storage device" > loop/usb.txt root@desk-mx8mm:~# umount loop root@desk-mx8mm:~#
then insert the g_mass_storage kernel module driver enabling an Windows PC to see it as a removable device
root@desk-mx8mp:~# modprobe g_mass_storage removable=y file=mass_storage [ 891.807023] Mass Storage Function, version: 2009/09/11 [ 891.813145] LUN: removable file: (no medium) [ 891.818901] LUN: removable file: /home/root/mass_storage [ 891.824754] Number of LUNs=1 [ 891.827901] g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11 [ 891.834955] g_mass_storage gadget: userspace failed to provide iSerialNumber [ 891.842109] g_mass_storage gadget: g_mass_storage ready root@desk-mx8mp:~#
Once the USB cable is connected to the PC, the kernel prints the following messages:
root@desk-mx6:~# [ 892.036840] g_mass_storage gadget: high-speed config #1: Linux File-Backed Storage
and the Windows PC activate the driver and the disk is available as a Drive Unit (with the usb.txt file available).
