/**
* @brief Generic endpoint OUT handler.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
static void otg_epout_handler(USBDriver *usbp, usbep_t ep) {
stm32_otg_t *otgp = usbp->otg;
uint32_t epint = otgp->oe[ep].DOEPINT;
/* Resets all EP IRQ sources.*/
otgp->oe[ep].DOEPINT = epint;
if ((epint & DOEPINT_STUP) && (otgp->DOEPMSK & DOEPMSK_STUPM)) {
/* Setup packets handling, setup packets are handled using a
specific callback.*/
_usb_isr_invoke_setup_cb(usbp, ep);
}
if ((epint & DOEPINT_XFRC) && (otgp->DOEPMSK & DOEPMSK_XFRCM)) {
/* Receive transfer complete.*/
USBOutEndpointState *osp = usbp->epc[ep]->out_state;
if (osp->rxsize < osp->totsize) {
/* In case the transaction covered only part of the total transfer
then another transaction is immediately started in order to
cover the remaining.*/
osp->rxsize = osp->totsize - osp->rxsize;
osp->rxcnt = 0;
usb_lld_prepare_receive(usbp, ep);
chSysLockFromIsr();
usb_lld_start_out(usbp, ep);
chSysUnlockFromIsr();
}
else {
/* End on OUT transfer.*/
_usb_isr_invoke_out_cb(usbp, ep);
}
}
}
/**
* @brief Prepares for a receive transaction on an OUT endpoint.
* @post The endpoint is ready for @p usbStartReceiveI().
* @note This function can be called both in ISR and thread context.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
* @param[out] buf buffer where to copy the received data
* @param[in] n transaction size
*
* @special
*/
void usbPrepareReceive(USBDriver *usbp, usbep_t ep, uint8_t *buf, size_t n) {
USBOutEndpointState *osp = usbp->epc[ep]->out_state;
osp->rxqueued = false;
osp->mode.linear.rxbuf = buf;
osp->rxsize = n;
osp->rxcnt = 0;
usb_lld_prepare_receive(usbp, ep);
}
/**
* @brief Prepares for a receive transaction on an OUT endpoint.
* @post The endpoint is ready for @p usbStartReceiveI().
* @note This function can be called both in ISR and thread context.
* @note The queue must have enough free space to accommodate the
* specified transaction size rounded to the next packet size
* boundary. For example if the transaction size is 1 and the
* packet size is 64 then the queue must have space for at least
* 64 bytes.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
* @param[in] iqp input queue to be filled with incoming data
* @param[in] n transaction size
*
* @special
*/
void usbPrepareQueuedReceive(USBDriver *usbp, usbep_t ep,
input_queue_t *iqp, size_t n) {
USBOutEndpointState *osp = usbp->epc[ep]->out_state;
osp->rxqueued = true;
osp->mode.queue.rxqueue = iqp;
osp->rxsize = n;
osp->rxcnt = 0;
usb_lld_prepare_receive(usbp, ep);
}