USB Keyboard

[Ioannis]

Thanks to your help I am making a progress after a lot of experimenting. Sure I do not understand the whole process but anyway...

I managed to enumerate the PIC and display on an open text file a short string of characters from an 8 byte buffer.

How can this buffer made bigger? I changed these in the main program

USBBufferSizeTX con 16                                                                                    
USBBufferSizeRX con 16
USBBufferCount Var Byte
USBBufferIn var byte[16]
USBBufferOut Var Byte[16]

but still sends only the half buffer.

Then I changed in the hid_desc.bas file this line

retlw	0x10		; This should be the size of the endpoint buffer

from 0x08 to 0x10 but still no joy. I attach the descriptor file.

Any idea?

Ioannis

P.S. I also changed

#define HID_INT_OUT_EP_SIZE 8

in the descriptor file to 16 but still sends 8 byte buffer...

[richard]

never tried it as hid kb but for a hid cdc anyway the data you need to send must be chunked into usb-tx buffer sized lumps
then sent a multiple usb transmissions.

what have you tried ?

[pedja089]

It is not so easy to change buffer. You must change descriptor file, not just length(If I understand usb correctly).

You can send one letter and modifier key at time.

Use this

 For i = 0 To 20	
                lookup i,[KEY_V, KEY_A, KEY_L, KEY_U, KEY_E, KEY_ENTER, 0], USBBufferOut[2]
                call DoUsbOut
                IF USBBufferOut[2]=0 THEN EXIT
            Next i

You can use array

 For i = 0 To 20	
                  USBBufferOut[2]= MyArray[i]
                call DoUsbOut
                IF USBBufferOut[2]=0 THEN EXIT
            Next i

[Jerson]

If you follow the HID descriptor fields, you will notice you need to change the report count for the report which has to carry more data. The endpoint buffer is just a holding place for the in/out data that is handled by the USB interrupt. I am not very conversant with HID at the moment, but can look it up as I have worked on HID keyboards with PSoC

[Ioannis]

what have you tried ?

I think every variable or constant I could find in the program and the descriptor file. One at a time or combination of them. The result was sending the 8 wide buffer all the time.

It is not so easy to change buffer. You must change descriptor file, not just length(If I understand usb correctly).

[/CODE]

Yes, I found the hard way...

I guess for now, your approach is the only way to do it. I thought I could escape with just a number change from 8 to 16!

Jerson, as I noted above, I did change all those variables related to the buffer size (all where at 8 bytes) within descriptor file, but nothing really worked.

Ioannis

[pedja089]

Along buffer size, you need to change in hid_desc.bas:

ReportDescriptor1
	retlw   0x05
	retlw   0x01    ; usage page (generic desktop)
	retlw   0x09
	retlw   0x06    ; usage (keyboard)
	retlw   0xA1
	retlw   0x01    ; collection (application)
	retlw   0x05
	retlw   0x07    ;   usage (Key codes)
	retlw   0x19
	retlw   0xE0    ;   usage minimum (224)
	retlw   0x29
	retlw   0xE7    ;   usage minimum (231)
	retlw   0x15
	retlw   0x00    ;     logical minimum (0)
	retlw   0x25
	retlw   0x01    ;     logical maximum (1)
	retlw   0x75
	retlw   0x01    ;     report size (1)
	retlw   0x95
	retlw   0x08    ;     report count (8)
	retlw   0x81
	retlw   0x02    ;     Input (data,variable,absolute)
	retlw   0x95
	retlw   0x01    ;     report count (1)
	retlw   0x75
	retlw   0x08    ;     report size (8)
	retlw   0x81
	retlw   0x01    ;     Input (constant)
	retlw   0x95
	retlw   0x05    ;     report count (5)
	retlw   0x75
	retlw   0x01    ;     report size (1)
	retlw   0x05
	retlw   0x08    ;     usage page (page# for leds)
	retlw   0x19
	retlw   0x01    ;     Usage minimum (1)
	retlw   0x29
	retlw   0x05    ;     Usage maximum (5)
	retlw   0x91
	retlw   0x02    ;     output (data,variable,absolute)
	retlw   0x95
	retlw   0x01    ;     report count (1)
	retlw   0x75
	retlw   0x03    ;     report size (3)
	retlw   0x91
	retlw   0x01    ;     output (constant)
	retlw   0x95
	retlw   0x06    ;     report count (6)
	retlw   0x75
	retlw   0x08    ;     report size (8)
	retlw   0x15
	retlw   0x00    ;     logical minimum (0)
	retlw   0x25
	retlw   0x65    ;     logical maximum (101)
	retlw   0x05
	retlw   0x07    ;     usage page (keycodes)
	retlw   0x19
	retlw   0x00    ;     usage minimum (0)
	retlw   0x29
	retlw   0x65    ;     usage maximum (101)
	retlw   0x81
	retlw   0x00    ;     input (data, array)	
	retlw   0xC0    ;   end collection
EndReportDescriptor1

If I understand correctly. But I never had any luck with changing descriptor files.

[pedja089]

I think you can find some info in this series:



Look for nkey roll over descriptor...

[Ioannis]

Along buffer size, you need to change in hid_desc.bas:

ReportDescriptor1
	retlw   0x05
	retlw   0x01    ; usage page (generic desktop)
	retlw   0x09
	retlw   0x06    ; usage (keyboard)
	retlw   0xA1
	retlw   0x01    ; collection (application)
	retlw   0x05
	retlw   0x07    ;   usage (Key codes)
	retlw   0x19
	retlw   0xE0    ;   usage minimum (224)
	retlw   0x29
	retlw   0xE7    ;   usage minimum (231)
	retlw   0x15
	retlw   0x00    ;     logical minimum (0)
	retlw   0x25
	retlw   0x01    ;     logical maximum (1)
	retlw   0x75
	retlw   0x01    ;     report size (1)
	retlw   0x95
	retlw   0x08    ;     report count (8)
	retlw   0x81
	retlw   0x02    ;     Input (data,variable,absolute)
	retlw   0x95
	retlw   0x01    ;     report count (1)
	retlw   0x75
	retlw   0x08    ;     report size (8)
	retlw   0x81
	retlw   0x01    ;     Input (constant)
	retlw   0x95
	retlw   0x05    ;     report count (5)
	retlw   0x75
	retlw   0x01    ;     report size (1)
	retlw   0x05
	retlw   0x08    ;     usage page (page# for leds)
	retlw   0x19
	retlw   0x01    ;     Usage minimum (1)
	retlw   0x29
	retlw   0x05    ;     Usage maximum (5)
	retlw   0x91
	retlw   0x02    ;     output (data,variable,absolute)
	retlw   0x95
	retlw   0x01    ;     report count (1)
	retlw   0x75
	retlw   0x03    ;     report size (3)
	retlw   0x91
	retlw   0x01    ;     output (constant)
	retlw   0x95
	retlw   0x06    ;     report count (6)
	retlw   0x75
	retlw   0x08    ;     report size (8)
	retlw   0x15
	retlw   0x00    ;     logical minimum (0)
	retlw   0x25
	retlw   0x65    ;     logical maximum (101)
	retlw   0x05
	retlw   0x07    ;     usage page (keycodes)
	retlw   0x19
	retlw   0x00    ;     usage minimum (0)
	retlw   0x29
	retlw   0x65    ;     usage maximum (101)
	retlw   0x81
	retlw   0x00    ;     input (data, array)	
	retlw   0xC0    ;   end collection
EndReportDescriptor1

If I understand correctly. But I never had any luck with changing descriptor files.

Me too... There is no documentation of all these parameters...

Will watch the videos. Thanks for the info each and everyone.
Ioannis