Hello -
This is my first post to this newsletter. I have been trying to write
host software to communicate with a low-speed USB PIC Microcontroller.
The device is configured to send and receive 32 byte reports. The
designer of the usb project has code writen in Windows Pascal
(Delphi?) to control the device. The code is a rework from the code
generated by EasyHID. Here is my output of lsusb:
------------------------------------------------------------
llamabox hqct # lsusb -d 04d8:000a -vvvv
Bus 001 Device 002: ID 04d8:000a Microchip Technology, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x04d8 Microchip Technology, Inc.
idProduct 0x000a
bcdDevice 0.01
iManufacturer 1 Datalex
iProduct 2 Car-Radio
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 41
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 3 Human Interface Devices
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.01
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 47
Report Descriptor: (length is 47)
Item(Global): Usage Page, data= [ 0xa0 0xff ] 65440
(null)
Item(Local ): Usage, data= [ 0x01 ] 1
(null)
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Local ): Usage, data= [ 0x03 ] 3
(null)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x00 0xff ] 65280
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x20 ] 32
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0x04 ] 4
(null)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x00 0xff ] 65280
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x20 ] 32
Item(Main ): Output, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0x05 ] 5
(null)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x00 0xff ] 65280
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x02 ] 2
Item(Main ): Feature, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
------------------------------------------------------------
I originally tried using a HIDDEV device. I could not figure out how
to write to the device properly. Looking at the source shows that
write() is implemented to return an error. The documentation is too
ambiguous for me to figure out how to write properly... I couldn't get
HIDIOCSREPORT to work properly at all. I have read a good deal of the
USB HID papers even.
I tried writing a kernel module based around usb-skel.c. I was able to
change the state of the device noticibly, but I haven't been able to
recreate it. So, this has only happened once. I change the skeleton
to write to the interrupt endpoints instead of using bulk transfer
since that is not supported.
I have even tried using libhid and that hasn't worked. The path I
have tried for writing is:
{ 0xffa00001, 0xffa00003 }
This has not worked, from what I could tell, at all. I have even tried
using three different functions for writing while using the libhid
approach: hid_set_output_report(), usb_interrupt_write(), and
hid_interrupt_write().
I have tried restarting the computer and device between almost every
test. Has anyone been able to communicate with a PIC or a comparable
HID device? All I want is to send a 32 byte report.
I will post sources if requested, I'm not sure how much they would help though.
Thank you,
Paul
------------------------------------------------------------
llamabox hqct # cat /proc/bus/usb/devices
[...]
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=04d8 ProdID=000a Rev= 0.01
S: Manufacturer=Datalex
S: Product=Car-Radio
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=03(HID ) Sub=00 Prot=00 Driver=(none)
E: Ad=81(I) Atr=03(Int.) MxPS= 64 Ivl=1ms
E: Ad=01(O) Atr=03(Int.) MxPS= 64 Ivl=1ms
-------------------------------------------------------
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