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 ?
Re: USB Keyboard
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 ?
Warning I'm not a teacher
Re: USB Keyboard
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
You can use arrayCode: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
Code:For i = 0 To 20 USBBufferOut[2]= MyArray[i] call DoUsbOut IF USBBufferOut[2]=0 THEN EXIT Next i
Re: USB Keyboard
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
Last edited by Jerson; - 19th December 2021 at 03:43. Reason: removed signature
Re: USB Keyboard
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.Originally Posted by richard
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
Re: USB Keyboard
Along buffer size, you need to change in hid_desc.bas:
If I understand correctly. But I never had any luck with changing descriptor files.Code: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
Re: USB Keyboard
I think you can find some info in this series:
Look for nkey roll over descriptor...
Re: USB Keyboard
if i watch that first video again i could fool myself into believing that one day i might understand usb enough to actually get somewhere with it
great info pedja089
Warning I'm not a teacher
Re: USB Keyboard
Me too...There is no documentation of all these parameters...
Will watch the videos. Thanks for the info each and everyone.
Ioannis
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