/**
* @brief USB reset routine.
* @details This function must be invoked when an USB bus reset condition is
* detected.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void _usb_reset(USBDriver *usbp) {
unsigned i;
/* State transition.*/
usbp->state = USB_READY;
/* Resetting internal state.*/
usbp->status = 0;
usbp->address = 0;
usbp->configuration = 0;
usbp->transmitting = 0;
usbp->receiving = 0;
/* Invalidates all endpoints into the USBDriver structure.*/
for (i = 0; i <= (unsigned)USB_MAX_ENDPOINTS; i++) {
usbp->epc[i] = NULL;
}
/* EP0 state machine initialization.*/
usbp->ep0state = USB_EP0_WAITING_SETUP;
/* Low level reset.*/
usb_lld_reset(usbp);
/* Notification of reset event.*/
_usb_isr_invoke_event_cb(usbp, USB_EVENT_RESET);
}
/**
* @brief USB reset routine.
* @details This function must be invoked when an USB bus reset condition is
* detected.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void _usb_reset(USBDriver *usbp) {
unsigned i;
usbp->state = USB_READY;
usbp->status = 0;
usbp->address = 0;
usbp->configuration = 0;
usbp->transmitting = 0;
usbp->receiving = 0;
/* Invalidates all endpoints into the USBDriver structure.*/
for (i = 0; i <= USB_MAX_ENDPOINTS; i++)
usbp->epc[i] = NULL;
/* EP0 state machine initialization.*/
usbp->ep0state = USB_EP0_WAITING_SETUP;
/* Low level reset.*/
usb_lld_reset(usbp);
}
/**
* @brief USB reset routine.
* @details This function must be invoked when an USB bus reset condition is
* detected.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void _usb_reset(USBDriver *usbp) {
unsigned i;
/* State transition.*/
usbp->state = USB_READY;
/* Resetting internal state.*/
usbp->status = 0;
usbp->address = 0;
usbp->configuration = 0;
usbp->transmitting = 0;
usbp->receiving = 0;
/* Invalidates all endpoints into the USBDriver structure.*/
for (i = 0; i <= (unsigned)USB_MAX_ENDPOINTS; i++) {
#if USB_USE_WAIT == TRUE
/* Signaling the event to threads waiting on endpoints.*/
if (usbp->epc[i] != NULL) {
osalSysLockFromISR();
if (usbp->epc[i]->in_state != NULL) {
osalThreadResumeI(&usbp->epc[i]->in_state->thread, MSG_RESET);
}
if (usbp->epc[i]->out_state != NULL) {
osalThreadResumeI(&usbp->epc[i]->out_state->thread, MSG_RESET);
}
osalSysUnlockFromISR();
}
#endif
usbp->epc[i] = NULL;
}
/* EP0 state machine initialization.*/
usbp->ep0state = USB_EP0_WAITING_SETUP;
/* Low level reset.*/
usb_lld_reset(usbp);
/* Notification of reset event.*/
_usb_isr_invoke_event_cb(usbp, USB_EVENT_RESET);
}
/**
* @brief Configures and activates the USB peripheral.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void usb_lld_start(USBDriver *usbp) {
if (usbp->state == USB_STOP) {
/* Clock activation.*/
#if STM32_USB_USE_USB1
if (&USBD1 == usbp) {
/* USB clock enabled.*/
rccEnableUSB(true);
/* Powers up the transceiver while holding the USB in reset state.*/
STM32_USB->CNTR = CNTR_FRES;
/* Enabling the USB IRQ vectors, this also gives enough time to allow
the transceiver power up (1uS).*/
#if STM32_USB1_HP_NUMBER != STM32_USB1_LP_NUMBER
nvicEnableVector(STM32_USB1_HP_NUMBER, STM32_USB_USB1_HP_IRQ_PRIORITY);
#endif
nvicEnableVector(STM32_USB1_LP_NUMBER, STM32_USB_USB1_LP_IRQ_PRIORITY);
/* Releases the USB reset.*/
STM32_USB->CNTR = 0;
}
#endif
/* Reset procedure enforced on driver start.*/
usb_lld_reset(usbp);
}
}