I found out that it is possible to create a very simple USB device with two
bulk endpoints with the g-serial kernel driver with ACM mode turned off:
*modprobe g-serial idVendor=0x18D1 idProduct=0x2D00 use_acm=0*
See attached "lsusb -v" output of the created gadget device. On the host
side, a very simple "Hello World" program works (to write "Hello World" to
the gadget, which can be read from /dev/ttyGS0 on the gadget side), see
attached source file.
But the IOIO does unfortunately not connect to this gadget. Do you have any
idea why? Does it require special endpoint addresses or other device
descriptor properties? Tried idProduct=0x2D01, but it does not work as well.
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#include <stdio.h>
#include <libusb.h>
int main(void)
{
libusb_context *ctx = NULL;
int r = libusb_init(&ctx); //initialize a library session
if(r < 0)
{
fprintf(stderr, "libusb_init failed: %d\n", r);
return 1;
}
libusb_set_debug(ctx, 3);
libusb_device_handle* dev = libusb_open_device_with_vid_pid(ctx, 0x18D1, 0x2D00);
if (!dev)
{
fprintf(stderr, "USB device with VID 0x18D1 / PID 0x2D00 not found or not accessible!\n");
return 1;
}
r = libusb_claim_interface(dev, 0);
if(r != 0)
{
fprintf(stderr, "libusb_claim_interface failed: %d\n", r);
return 1;
}
unsigned char data[] = "Hello World!";
int transferred = 0;
r = libusb_bulk_transfer(dev, 0x01, data, sizeof(data), &transferred, 1000);
if ((r != 0) || (transferred == 0))
{
fprintf(stderr, "libusb_bulk_transfer failed: %d\n", r);
return 1;
}
libusb_close(dev);
return 0;
}
Bus 001 Device 006: ID 18d1:2d00 Google Inc. Android-powered device
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.10
bDeviceClass 255 Vendor Specific Class
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x18d1 Google Inc.
idProduct 0x2d00 Android-powered device in accessory mode
bcdDevice 3.08
iManufacturer 1 Linux 3.8.13 with usb338x
iProduct 2 Gadget Serial v2.4
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4 Generic Serial config
bmAttributes 0xc0
Self Powered
MaxPower 2mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Binary Object Store Descriptor:
bLength 5
bDescriptorType 15
wTotalLength 22
bNumDeviceCaps 2
USB 2.0 Extension Device Capability:
bLength 7
bDescriptorType 16
bDevCapabilityType 2
bmAttributes 0x00000002
Link Power Management (LPM) Supported
SuperSpeed USB Device Capability:
bLength 10
bDescriptorType 16
bDevCapabilityType 3
bmAttributes 0x00
wSpeedsSupported 0x000f
Device can operate at Low Speed (1Mbps)
Device can operate at Full Speed (12Mbps)
Device can operate at High Speed (480Mbps)
Device can operate at SuperSpeed (5Gbps)
bFunctionalitySupport 1
Lowest fully-functional device speed is Full Speed (12Mbps)
bU1DevExitLat 1 micro seconds
bU2DevExitLat 500 micro seconds
Device Status: 0x0002
(Bus Powered)
Remote Wakeup Enabled
