Hi all,
I'm on kernel 2.6.36.2 and I'm trying to connect to some custom
hardware which uses a PIC 18f14k50 microcontroller to allow
communication over USB. The PIC is programmed to behave like a
serial port and I would like to have it show up as /dev/ttyXXX
so I can use the standard open/reader/write/close/etc system
calls.
The device is definitely connected and lsusb says this:
Bus 001 Device 010: ID 04d8:000a Microchip Technology, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x04d8 Microchip Technology, Inc.
idProduct 0x000a
bcdDevice 1.00
iManufacturer 1
iProduct 2
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 67
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 0
CDC Header:
bcdCDC 1.10
CDC ACM:
bmCapabilities 0x02
line coding and serial state
CDC Union:
bMasterInterface 0
bSlaveInterface 1
CDC Call Management:
bmCapabilities 0x00
bDataInterface 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 2
In earlier versions of kernel, this device was handled by the
cdc-acm module, but in this kernel, that module doesn't want
to talk to the PIC. I have tried hacking the cdc-acm module
to explicitly look for this VID/PID, but that still hasn't
helped. There are no interesting or useful dmesgs either.
Any clues on how to further debug this? Pointers?
Thanks,
Erik
--
=======================
erik de castro lopo
senior design engineer
bCODE
suite 1, level 10
71 macquarie street
sydney nsw 2000
australia
tel +61 (0)2 9954 4411
fax +61 (0)2 9954 4422
www.bcode.com
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