[libhid-discuss] inquiry about writing to data location with specific Report ID

Charles Lepple

2008-07-07 12:52:38 UTC

Post by Aadit Shrestha
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.)

Post by Aadit Shrestha
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].
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]...
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.
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.
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
bLength 9
bDescriptorType 2
wTotalLength 55
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4 Config 1
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 400mA
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
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
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
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
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
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,
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