[libhid-discuss] inquiry about writing to data location with specific Report ID
Charles Lepple
clepple at ghz.cc
Mon Jul 7 12:52:38 UTC 2008
On Jul 7, 2008, at 1:27 AM, Aadit Shrestha wrote:
> I have tried different Input Paths as specified in your example for
> the
> Phidgets Quad ServoController, but I have not quite gotten it right.
The problem here is that the HID descriptor uses the same usage and
usage page for some of the report IDs.
By the way, it is always a good idea to mention which version of the
library you are using (0.2.16, SVN revision, etc.)
Also, according to the HID descriptor (which may be wrong in this
regard as well), you should only be reading and writing one byte at a
time. (The max transfer size for the endpoints is two bytes to
accommodate the report ID as well as the single byte of data.)
> I have tried different things but I seem to end up with report ID
> 0x00 and
> report ID 0x01, and never with the desired report ID 0x02.
> This is the part I have added to your program for write and read.
> -----------
> int const PATH_IN[2] = { 0xff000000,0xff000000};
> int const PATH_OUT[2] = {0xff000000,0xff000000};
> char const PACKET[1] = {0x02,0x04};
> printf("From here ================================================
> \n");
>
> ret = hid_set_output_report(hid, PATH_IN, PATHLEN, PACKET,
> SEND_PACKET_LEN);
>
> if (ret != HID_RET_SUCCESS)
> {
> fprintf(stderr, "hid_set_output_report failed with return code %d
> \n", ret);
> }
>
> unsigned char const RECV_PACKET_LEN = 2;
> //char packet[RECV_PACKET_LEN];
> char packet[2];
> usleep(71000);
> ret = hid_get_input_report(hid, PATH_OUT, PATHLEN, packet,
> RECV_PACKET_LEN);
>
> if (ret != HID_RET_SUCCESS)
> {
> fprintf(stderr, "hid_get_input_report failed with return code %d
> \n", ret);
> }
> printf("To here ================================================ \n");
>
>
> --------------------
> Snippet from the output ....
> TRACE: hid_prepare_report_descriptor(): initialising the report
> descriptor
> for USB device 001/008[0]...
> TRACE: hid_prepare_report_descriptor(): retrieving report
> descriptor for
> USB device 001/008[0]...
> NOTICE: hid_prepare_report_descriptor(): successfully initialised
> report
> descriptor for USB device 001/008[0].
> TRACE: hid_prepare_parser(): setting up the HID parser for USB device
> 001/008[0]...
> TRACE: hid_reset_parser(): resetting the HID parser for USB device
> 001/008[0]...
> TRACE: hid_prepare_parser(): dumping the raw report descriptor
> TRACE: hid_prepare_parser(): 0x000: 0x06 0x00 0xff 0x09 0x00 0xa1
> 0x01 0x06
>
> TRACE: hid_prepare_parser(): 0x008: 0x00 0xff 0x85 0x01 0x09 0x00
> 0x15 0x00
>
> TRACE: hid_prepare_parser(): 0x010: 0x26 0xff 0x00 0x75 0x08 0x95
> 0x01 0x81
>
> TRACE: hid_prepare_parser(): 0x018: 0x02 0x09 0x00 0x75 0x08 0x95
> 0x01 0x91
>
> TRACE: hid_prepare_parser(): 0x020: 0x02 0x85 0x02 0x09 0x00 0x75
> 0x08 0x95
>
> TRACE: hid_prepare_parser(): 0x028: 0x01 0x81 0x02 0x09 0x00 0x75
> 0x08 0x95
>
> TRACE: hid_prepare_parser(): 0x030: 0x01 0x91 0x02 0x85 0x03 0x09
> 0x00 0x15
>
> TRACE: hid_prepare_parser(): 0x038: 0x00 0x26 0xff 0x00 0x75 0x08
> 0x95 0x01
>
> TRACE: hid_prepare_parser(): 0x040: 0x81 0x02 0x09 0x00 0x75 0x08
> 0x95 0x01
>
> TRACE: hid_prepare_parser(): 0x048: 0x91 0x02 0xc0
> TRACE: hid_prepare_parser(): parsing the HID tree of USB device
> 001/008[0]...
> NOTICE: hid_prepare_parser(): successfully set up the HID parser
> for USB
> device 001/008[0].
> NOTICE: hid_force_open(): successfully opened USB device 001/008[0].
> device identification of HIDInterface 001/008[0]:
> dev_handle: 0x0804e0c0
> device: 0x0804d048
> location: 001/008
> manufacturer: Innovative Experiment
> product: U-Board USB1.0/1.1 Interface
> serial number: V1.00
> TRACE: hid_reset_parser(): resetting the HID parser for USB device
> 001/008[0]...
> TRACE: hid_dump_tree(): iterating the parse tree for USB device
> 001/008[0]...
> parse tree of HIDInterface 001/008[0]:
> path: 0xff000000.0xff000000; type: 0x80
> path: 0xff000000.0xff000000; type: 0x90
> path: 0xff000000.0xff000000; type: 0x80
> path: 0xff000000.0xff000000; type: 0x90
> path: 0xff000000.0xff000000; type: 0x80
> path: 0xff000000.0xff000000; type: 0x90
> TRACE: hid_reset_parser(): resetting the HID parser for USB device
> 001/008[0]...
> From here ================================================
> TRACE: hid_set_output_report(): looking up report ID...
> TRACE: hid_prepare_parse_path(): preparing search path of depth 2
> for parse
> tree of USB device 001/008[0]...
> TRACE: hid_prepare_parse_path(): search path prepared for parse
> tree of USB
> device 001/008[0].
> NOTICE: hid_find_object(): found requested item.
> TRACE: hid_set_output_report(): sending report ID 0x01 (length: 2)
> to USB
> device 001/008[0]...
> NOTICE: hid_set_output_report(): successfully sent report to USB
> device
> 001/008[0].
> TRACE: hid_get_input_report(): looking up report ID...
> TRACE: hid_prepare_parse_path(): preparing search path of depth 2
> for parse
> tree of USB device 001/008[0]...
> TRACE: hid_prepare_parse_path(): search path prepared for parse
> tree of USB
> device 001/008[0].
> NOTICE: hid_find_object(): found requested item.
> TRACE: hid_get_input_report(): retrieving report ID 0x01 (length:
> 2) from
> USB device 001/008[0]...
> WARNING: hid_get_input_report(): failed to retrieve report from USB
> device
> 001/008[0]:error sending control message: Broken pipe.
> hid_get_input_report failed with return code 20
> To here ================================================
> TRACE: hid_close(): closing USB device 001/008[0]...
> TRACE: hid_close(): closing handle of USB device 001/008[0]...
> NOTICE: hid_close(): successfully closed USB device 001/008[0].
> ---------------------------------------
>
>
> Below is the output of lsusb -v
> ----------------
> minSOSpy:/home/aadit/USB# lsusb -d 04d8:0fff -v
>
> Bus 001 Device 008: ID 04d8:0fff Microchip Technology, Inc.
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 1.00
> bDeviceClass 0 (Defined at Interface level)
> bDeviceSubClass 0
> bDeviceProtocol 0
> bMaxPacketSize0 8
> idVendor 0x04d8 Microchip Technology, Inc.
> idProduct 0x0fff
> bcdDevice 1.00
> iManufacturer 1 Innovative Experiment
> iProduct 2 U-Board USB1.0/1.1 Interface
> iSerial 3 V1.00
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 55
> bNumInterfaces 1
> bConfigurationValue 1
> iConfiguration 4 Config 1
> bmAttributes 0xa0
> (Bus Powered)
> Remote Wakeup
> MaxPower 400mA
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 4
> bInterfaceClass 3 Human Interface Devices
> bInterfaceSubClass 0 No Subclass
> bInterfaceProtocol 0 None
> iInterface 5 Interface 0
> HID Device Descriptor:
> bLength 9
> bDescriptorType 33
> bcdHID 1.00
> bCountryCode 0 Not supported
> bNumDescriptors 1
> bDescriptorType 34 Report
> wDescriptorLength 75
> Report Descriptor: (length is 75)
> Item(Global): Usage Page, data= [ 0x00 0xff ] 65280
> (null)
> Item(Local ): Usage, data= [ 0x00 ] 0
> (null)
> Item(Main ): Collection, data= [ 0x01 ] 1
> Application
> Item(Global): Usage Page, data= [ 0x00 0xff ] 65280
> (null)
> Item(Global): Report ID, data= [ 0x01 ] 1
> Item(Local ): Usage, data= [ 0x00 ] 0
> (null)
> Item(Global): Logical Minimum, data= [ 0x00 ] 0
> Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Report Count, data= [ 0x01 ] 1
> Item(Main ): Input, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position
> Non_Volatile
> Bitfield
> Item(Local ): Usage, data= [ 0x00 ] 0
> (null)
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Report Count, data= [ 0x01 ] 1
> Item(Main ): Output, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position
> Non_Volatile
> Bitfield
> Item(Global): Report ID, data= [ 0x02 ] 2
> Item(Local ): Usage, data= [ 0x00 ] 0
> (null)
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Report Count, data= [ 0x01 ] 1
> Item(Main ): Input, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position
> Non_Volatile
> Bitfield
> Item(Local ): Usage, data= [ 0x00 ] 0
> (null)
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Report Count, data= [ 0x01 ] 1
> Item(Main ): Output, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position
> Non_Volatile
> Bitfield
> Item(Global): Report ID, data= [ 0x03 ] 3
> Item(Local ): Usage, data= [ 0x00 ] 0
> (null)
> Item(Global): Logical Minimum, data= [ 0x00 ] 0
> Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Report Count, data= [ 0x01 ] 1
> Item(Main ): Input, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position
> Non_Volatile
> Bitfield
> Item(Local ): Usage, data= [ 0x00 ] 0
> (null)
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Report Count, data= [ 0x01 ] 1
> Item(Main ): Output, 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 0x0002 1x 2 bytes
> bInterval 10
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x01 EP 1 OUT
> bmAttributes 3
> Transfer Type Interrupt
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0002 1x 2 bytes
> bInterval 10
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x82 EP 2 IN
> bmAttributes 3
> Transfer Type Interrupt
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0002 1x 2 bytes
> bInterval 10
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x02 EP 2 OUT
> bmAttributes 3
> Transfer Type Interrupt
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0002 1x 2 bytes
> bInterval 10
> Device Status: 0x0000
> (Bus Powered)
>
> ---------------------
> Can anyone tell me how to first write 1-byte into the data
> corresponding to
> ReportID 0x02 and the read from the same location after a delay.
> I apologize for sending a long message with so many details. I am
> sincerely
> hoping that someone can point me the right direction.
> Thanks and regards,
> _______________________________________________
> libhid-discuss mailing list
> libhid-discuss at lists.alioth.debian.org
> http://lists.alioth.debian.org/mailman/listinfo/libhid-discuss
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