PORTS Forum
Ports and Interfaces => USB => Topic started by: ulao on December 13, 2018, 08:34:12 pm
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I have set up a USB device with the typical gamepad descriptors but I seem to have a payload mismatch of some sort here. I keep getting a usb babble errors. From what I can tell that meansI sent too much data. My report descriptor is 8 bytes but if I send 8 bytes it does not enumerate. I must send 9 to get an enumeration but with 9 I get the babble error.
This is how LUFA sends data.
Endpoint_Write_Stream_LE(&reportBuffer, sizeof(reportBuffer), NULL);
I must set my size to 9 to get the usb to enumerate
unsigned char reportBuffer[9];
This is my descriptor
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x05, // USAGE (Gamepad)
0xa1, 0x01, // COLLECTION (Application)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x01, // LOGICAL_MAXIMUM (1)
0x35, 0x00, // PHYSICAL_MINIMUM (0)
0x45, 0x01, // PHYSICAL_MAXIMUM (1)
0x75, 0x01, // REPORT_SIZE (1)
0x95, 0x0e, // REPORT_COUNT (14)
0x05, 0x09, // USAGE_PAGE (Button)
0x19, 0x01, // USAGE_MINIMUM (Button 1)
0x29, 0x0e, // USAGE_MAXIMUM (Button 14)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x95, 0x02, // REPORT_COUNT (2)
0x81, 0x01, // INPUT (Cnst,Ary,Abs)
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x25, 0x07, // LOGICAL_MAXIMUM (7)
0x46, 0x3b, 0x01, // PHYSICAL_MAXIMUM (315)
0x75, 0x04, // REPORT_SIZE (4)
0x95, 0x01, // REPORT_COUNT (1)
0x65, 0x14, // UNIT (Eng Rot:Angular Pos)
0x09, 0x39, // USAGE (Hat switch)
0x81, 0x42, // INPUT (Data,Var,Abs,Null)
0x65, 0x00, // UNIT (None)
0x95, 0x01, // REPORT_COUNT (1)
0x81, 0x01, // INPUT (Cnst,Ary,Abs)
0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (255)
0x46, 0xff, 0x00, // PHYSICAL_MAXIMUM (255)
0x09, 0x30, // USAGE (X)
0x09, 0x31, // USAGE (Y)
0x09, 0x32, // USAGE (Z)
0x09, 0x35, // USAGE (Rz)
0x75, 0x08, // REPORT_SIZE (8)
0x95, 0x04, // REPORT_COUNT (4)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x75, 0x08, // REPORT_SIZE (8)
0x95, 0x01, // REPORT_COUNT (1)
0x81, 0x01, // INPUT (Cnst,Ary,Abs)
0xc0, // END_COLLECTION
If I try top capture the error on enumeration I get pnp device state failed.
I can provide more data if needed.
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Agree that your report size is 8 bytes/64 bits. You're not using report IDs so no need to include that in the reportBuffer.
If you have any related example code, I would suggest looking at that for clues.
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Actually that is the issue, this was example (working ) code. All I did was put in the new descriptor. The old descriptor was 19 bytes. So all I did was changed the array from 19 to 8. I also made a change to the vid/pid.
This was the old descriptor.
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x05, // USAGE (Gamepad)
0xa1, 0x01, // COLLECTION (Application)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x01, // LOGICAL_MAXIMUM (1)
0x35, 0x00, // PHYSICAL_MINIMUM (0)
0x45, 0x01, // PHYSICAL_MAXIMUM (1)
0x75, 0x01, // REPORT_SIZE (1)
0x95, 0x0d, // REPORT_COUNT (13)
0x05, 0x09, // USAGE_PAGE (Button)
0x19, 0x01, // USAGE_MINIMUM (Button 1)
0x29, 0x0d, // USAGE_MAXIMUM (Button 13)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x95, 0x03, // REPORT_COUNT (3)
0x81, 0x01, // INPUT (Cnst,Ary,Abs)
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x25, 0x07, // LOGICAL_MAXIMUM (7)
0x46, 0x3b, 0x01, // PHYSICAL_MAXIMUM (315)
0x75, 0x04, // REPORT_SIZE (4)
0x95, 0x01, // REPORT_COUNT (1)
0x65, 0x14, // UNIT (Eng Rot:Angular Pos)
0x09, 0x39, // USAGE (Hat switch)
0x81, 0x42, // INPUT (Data,Var,Abs,Null)
0x65, 0x00, // UNIT (None)
0x95, 0x01, // REPORT_COUNT (1)
0x81, 0x01, // INPUT (Cnst,Ary,Abs)
0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (255)
0x46, 0xff, 0x00, // PHYSICAL_MAXIMUM (255)
0x09, 0x30, // USAGE (X)
0x09, 0x31, // USAGE (Y)
0x09, 0x32, // USAGE (Z)
0x09, 0x35, // USAGE (Rz)
0x75, 0x08, // REPORT_SIZE (8)
0x95, 0x04, // REPORT_COUNT (4)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x06, 0x00, 0xff, // USAGE_PAGE (Vendor Specific)
0x09, 0x20, // Unknown
0x09, 0x21, // Unknown
0x09, 0x22, // Unknown
0x09, 0x23, // Unknown
0x09, 0x24, // Unknown
0x09, 0x25, // Unknown
0x09, 0x26, // Unknown
0x09, 0x27, // Unknown
0x09, 0x28, // Unknown
0x09, 0x29, // Unknown
0x09, 0x2a, // Unknown
0x09, 0x2b, // Unknown
0x95, 0x0c, // REPORT_COUNT (12)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x0a, 0x21, 0x26, // Unknown
0x95, 0x08, // REPORT_COUNT (8)
0xb1, 0x02, // FEATURE (Data,Var,Abs)
0xc0, // END_COLLECTION
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I added a new pipe (out) and the issue went away.
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Thanks for reporting back!