// Schedule an already filled-in transfer descriptor for execution on
// the given endpoint, waiting until the endpoint has finished.
void usb_endpoint_schedule_wait(
const usb_endpoint_t* const endpoint,
usb_transfer_descriptor_t* const td
) {
// Ensure that endpoint is ready to be primed.
// It may have been flushed due to an aborted transaction.
// TODO: This should be preceded by a flush?
while( usb_endpoint_is_ready(endpoint) );
td->next_dtd_pointer = USB_TD_NEXT_DTD_POINTER_TERMINATE;
usb_endpoint_prime(endpoint, td);
}
void usb_endpoint_schedule_no_int(
const usb_endpoint_t* const endpoint,
usb_transfer_descriptor_t* const td
) {
// Ensure that endpoint is ready to be primed.
// It may have been flushed due to an aborted transaction.
// TODO: This should be preceded by a flush?
while( usb_endpoint_is_ready(endpoint) );
// Configure a transfer.
td->total_bytes =
USB_TD_DTD_TOKEN_TOTAL_BYTES(16384)
/*| USB_TD_DTD_TOKEN_IOC*/
| USB_TD_DTD_TOKEN_MULTO(0)
| USB_TD_DTD_TOKEN_STATUS_ACTIVE
;
usb_endpoint_prime(endpoint, td);
}
// Schedule an already filled-in transfer descriptor for execution on
// the given endpoint, appending to the end of the endpoint's queue if
// there are pending TDs. Note that this requires that one knows the
// tail of the endpoint's TD queue. Moreover, the user is responsible
// for setting the TERMINATE bit of next_dtd_pointer if needed.
void usb_endpoint_schedule_append(
const usb_endpoint_t* const endpoint,
usb_transfer_descriptor_t* const tail_td,
usb_transfer_descriptor_t* const new_td
) {
bool done;
tail_td->next_dtd_pointer = new_td;
if (usb_endpoint_is_priming(endpoint)) {
return;
}
do {
USB0_USBCMD_D |= USB0_USBCMD_D_ATDTW;
done = usb_endpoint_is_ready(endpoint);
} while (!(USB0_USBCMD_D & USB0_USBCMD_D_ATDTW));
USB0_USBCMD_D &= ~USB0_USBCMD_D_ATDTW;
if(!done) {
usb_endpoint_prime(endpoint, new_td);
}
}
