USB Endpoints

[Kamikaze47]

Thanks nimonia,

Yeah I just use EP 1 for my usb programs and it seems to always work. There is a lot of stuff out there on USB, but most of it's jargon and doesn't explain it easily.

I too have been messing with a HID keyboard interface and almost have it working.

I can mimic the Num lock, scroll lock, and caps lock leds on my test PCB when they're pressed on the main PC keyboard.

I can send the special keys (shift, control, GUI)

I can and send regular key chars but... I have a problem with the chars repeating. So if I press the key "J" for instances it keeps on sending, my program seems to be stuck in the DoUSBout out loop. I've tried sending a $00 code as a keystop but this doesn't work.

Have you run into this problem at all? Anyone else?
Cheers
Squib

----

OK I sussed this one out hrs after posting... always the way!

Squibcakes, could you post your code for using USBIN to receive the PC's packets with the keyboard LED status?

I'm also making a USB keyboard, and I've got the PIC->PC communication working perfectly, but struggling with the PC->PIC communication.

Thanks

[sirnoname]

look, here is a interrupt handler of keyboard LED on 16C745 / 765

' Define interrupt handler
DEFINE INTHAND usbint
' Assembly language interrupt handler
asm
; W, STATUS and PCLATH registers already saved, save FSR
usbint movf FSR, W
movwf fsave
; Check interrupt source and vector there
movlw high ServiceUSBInt
movwf PCLATH
btfsc PIR1, USBIF
call ServiceUSBInt
btfsc PIR2, USBIF
call ServiceUSBInt
; Restore saved registers
banksel UIR
movf 0xC8,w
clrf STATUS
movwf kbdLED
movf fsave, W
movwf FSR
movf psave, W
movwf PCLATH
swapf ssave, W
movwf STATUS
swapf wsave, F
swapf wsave, W

retfie ; Return from interrupt
endasm

before the kbdLED should be defined in Picbasic static (important !):
kbdLED VAR BYTE bank0 system

on 18F Chips the code have to be placed in the USB interrupt routine.
LEDs are using the EP0 control transfere.
To get pc->pic communication use a component device with a HID + Keyboard interface.