[fpc-pascal] USB Human Interface Devices

[James Richters]

DATA!!!!!!!!!!!!!!


Running "i:\programming\libusbxhid\libusbhid_test.exe "
Found 15 devices attached
8086:A36D, bus: 1, address: 0
8087:0AAA, bus: 1, address: 5
0424:2734, bus: 1, address: 51
1D50:6015, bus: 1, address: 38
1B1C:0C15, bus: 1, address: 7
10CE:EB93, bus: 1, address: 47
Found device with vid:pid 4302:60307 at idx:5!
Device instance found: 1  at idx:5!
05E3:0610, bus: 1, address: 3
04E8:61F5, bus: 1, address: 18
1B1C:0C10, bus: 1, address: 4
0424:274C, bus: 1, address: 46
047D:1020, bus: 1, address: 45
1B1C:1B4F, bus: 1, address: 43
1A40:0101, bus: 1, address: 50
0C45:7403, bus: 1, address: 36
10C4:EA60, bus: 1, address: 30
Index of device 4302:60307=5
Device opened. Next I must claim the interface.
Freeing device list with 15 devices
USB device list freed. good boy!
device attempting go clear halt on ep $81
libusb: error [hid_clear_halt] unable to match endpoint to an open interface - cannot clear
clear halt failed
driver inactive - can claim interface
getting configuration....
active config:1
Claiming interface.....fingers crossed...
Interface claimed ... yay!
received:8 bytes from device
04,7F,. ,. ,0F,12,. ,1A,
received:8 bytes from device
. ,69,. ,. ,. ,13,. ,08,
received:8 bytes from device
. ,D3,. ,. ,. ,. ,01,92,
received:8 bytes from device
. ,8F,. ,. ,. ,. ,00,8A,
received:8 bytes from device
. ,2B,. ,. ,. ,. ,. ,0A,
Interface released. Phew..
Heap dump by heaptrc unit of i:\programming\libusbxhid\libusbhid_test.exe
401 memory blocks allocated : 18362/20440
401 memory blocks freed     : 18362/20440
0 unfreed memory blocks : 0
True heap size : 196608 (160 used in System startup)
True free heap : 196448


Yay I FINALLY got somewhere with this thing!!!   Thanks for the example Stefan!   I have a python example of how to decode the meaning of the incoming data, that's how I figured out that it sends 8 bytes at a time.  

Is there a way I can read data from the device with a timeout instead of just waiting forever for it?  It doesn't send anything unless I push a button, but I need to do other things like update the LCD if I am not pushing a button.   My python example uses a function called hid.read(size,timeout) so I'm trying to do something similar.  This is going to be a console application when I am done, do I don't have a way to do anything else, so a timeout would work best.

I'm also trying to figure out how to write to the LCD...
Here is the python code the outputs stuff to the device:

    # send feature report, but breaks it into 7 byte packets
    def write(self, data):
        n = 0
        n += self.hid.send_feature_report(data[0:7], 0x06)
        n += self.hid.send_feature_report(data[7:14], 0x06)
        n += self.hid.send_feature_report(data[14:21], 0x06)
        n += self.hid.send_feature_report(data[21:28], 0x06)
        n += self.hid.send_feature_report(data[28:35], 0x06)
        n += self.hid.send_feature_report(data[35:42], 0x06)
        return n

I think there is a bug because 7 bytes would be data[0..6] and it would not duplicate byte 7.... but the 0x06 must tell it to send from bytes 0 to 6... but anyway, regardless of that, how do I do something like hid.send_feature_report?

I'm guessing that libusbhid_set_report() is maybe something similar?   But it has parameters for reportType and reportNum... any clue what to put there?  Or is this not even the right function?   I thought maybe putting HID_REPORT_TYPE_FEATURE  would mean to send a feature report?  But reportNum I have no idea... I stuck a 1 in there just to see and tried:
libusbhid_set_report(device_context,HID_REPORT_TYPE_FEATURE,1,7,hidOutData[0..6]);
but then I get:
libusb: warning [_hid_set_report] mismatched report ID (data is FE, parameter is 01)
control transfer to usb device failed!

$FE is what I have in hidOutData[0], but I'm not sure what it wants for a report id?  

I put my attempt on Github here:
https://github.com/Zaaphod/libusbxhid

Can you tell me where to get libusb_1.0_X86.dll  ?    I had the x64 version from the sample Jean sent me, but I would like to make my program work on 32bit machines as well.

Thanks to everyone for the help with this!  I really appreciate it.

James