/**
* This is called by the interrupt handler
*/
void
usb_handle_transaction(struct usb_xfer_info *info)
{
enum usb_tok_pid pid = usb_get_xfer_pid(info);
struct usbd_ep_state_t *eps = &usb.ep_state[usb_get_xfer_ep(info)];
struct usbd_ep_pipe_state_t *s = &eps->pipe[usb_get_xfer_dir(info)];
switch (pid) {
case USB_PID_SETUP:
case USB_PID_OUT:
/**
* If we receive a SETUP transaction, but don't expect
* it (callback set to somewhere else), stall the EP.
*/
if (pid == USB_PID_SETUP && s->callback != usb_handle_control)
usb_handle_control_status(1);
else
usb_rx_next(s);
if (pid == USB_PID_SETUP)
usb_enable_xfers();
break;
case USB_PID_IN:
usb_tx_next(s);
break;
default:
break;
}
}
static void
submit_tx(struct usbd_ep_pipe_state_t *s)
{
/* usb_tx_next() flips the data toggle, so invert this here. */
s->data01 ^= 1;
usb_tx_next(s);
}
/**
* send USB data (IN device transaction)
*
* So far this function is specialized for EP 0 only.
*
* Returns: size to be transfered, or -1 on error.
*/
int
usb_tx(struct usbd_ep_pipe_state_t *s, const void *buf, size_t len, size_t reqlen, ep_callback_t cb, void *cb_data)
{
s->data_buf = (void *)buf;
s->transfer_size = len;
s->pos = 0;
s->callback = cb;
s->callback_data = cb_data;
if (s->transfer_size > reqlen)
s->transfer_size = reqlen;
if (s->transfer_size < reqlen && s->transfer_size % s->ep_maxsize == 0)
s->short_transfer = 1;
else
s->short_transfer = 0;
/* usb_tx_next() flips the data toggle, so invert this here. */
s->data01 ^= 1;
usb_tx_next(s);
return (s->transfer_size);
}
