4.12 usb device

This example demonstrates how to use USB device interface and verify the driver of USB client. The MYD-AM335X series development board works as a TF card reader, it is connected to the USB host of PC with a USB mini B to USB A cable.

Hardware Preparation：

Hardware debugging environment to see chapter2.
One TF card
One USB mini B to USB A cable.

Board Type	MYD-AM335X	MYD-AM335X-Y	MYD-AM335X-J
MINI USB interface	J2	J3	J3
TF Card	J17	J12	J19

Software Preparation:

Linux Kernel 4.1.18
modprobe command

Test Steps:

After the MYD-AM335X series development is booted, connect it to the USB host interface of PC with a USB mini B to USB A cable, Insert the TF card to MYD-AM335X series development. Load the mass storage gadget driver as below:

# modprobe g_mass_storage stall=0 file=/dev/mmcblk0p1 removable=1
[  687.171803] udc musb-hdrc.0.auto: registering UDC driver [g_mass_storage]
[  687.179455] Mass Storage Function, version: 2009/09/11
[  687.184933] LUN: removable file: (no medium)
[  687.192157] lun0: open backing file: /dev/mmcblk0p1
[  687.197379] LUN: removable file: /dev/mmcblk0p1
[  687.202952] Number of LUNs=1
[  687.206057] g_mass_storage gadget: adding config #1 'Linux File-Backed Storage'/bf2a45cc
[  687.215260] Number of LUNs=1
[  687.219060] g_mass_storage gadget: I/O thread pid: 185
[  687.224576] g_mass_storage gadget: adding 'Mass Storage Function'/dc896b00 to config 'Linux File-Backed Storage'
/bf2a45cc
[  687.236802] g_mass_storage gadget: cfg 1/bf2a45cc speeds: high full
[  687.243534] g_mass_storage gadget:   interface 0 = Mass Storage Function/dc896b00
[  687.252005] g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11
[  687.259466] g_mass_storage gadget: userspace failed to provide iSerialNumber
[  687.266948] g_mass_storage gadget: g_mass_storage ready
[  687.273141] g_mass_storage musb-hdrc.0.auto: usb_gadget_udc_start

After g_mass_storage driver is loaded, a removable disk will be detected on PC. The content of this removable disk is just the same with the TF card.

Note: Beyond that, users can load different gadget modules to achieve different functions. such as g_ether is used to make a RNDIS network interface.

4.12 usb device

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