/**
* @brief Default EP0 OUT callback.
* @details This function is used by the low level driver as default handler
* for EP0 OUT events.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number, always zero
*
* @notapi
*/
void _usb_ep0out(USBDriver *usbp, usbep_t ep) {
(void)ep;
switch (usbp->ep0state) {
case USB_EP0_RX:
/* Receive phase over, sending the zero sized status packet.*/
usbp->ep0state = USB_EP0_SENDING_STS;
usbPrepareTransmit(usbp, 0, NULL, 0);
chSysLockFromIsr();
usbStartTransmitI(usbp, 0);
chSysUnlockFromIsr();
return;
case USB_EP0_WAITING_STS:
/* Status packet received, it must be zero sized, invoking the callback
if defined.*/
if (usbGetReceiveTransactionSizeI(usbp, 0) != 0)
break;
if (usbp->ep0endcb != NULL)
usbp->ep0endcb(usbp);
usbp->ep0state = USB_EP0_WAITING_SETUP;
return;
default:
;
}
/* Error response, the state machine goes into an error state, the low
level layer will have to reset it to USB_EP0_WAITING_SETUP after
receiving a SETUP packet.*/
usb_lld_stall_in(usbp, 0);
usb_lld_stall_out(usbp, 0);
_usb_isr_invoke_event_cb(usbp, USB_EVENT_STALLED);
usbp->ep0state = USB_EP0_ERROR;
}
/**
* @brief Default data received callback.
* @details The application must use this function as callback for the OUT
* data endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*/
void mscDataReceived(USBDriver *usbp, usbep_t ep) {
size_t n;
n = usbGetReceiveTransactionSizeI(usbp, ep);
switch (msc_state) {
case MSC_IDLE:
if ((n != sizeof(msccbw_t)) || (CBW.dCBWSignature != MSC_CBW_SIGNATURE))
goto stall_out; /* 6.6.1 */
/* Decoding SCSI command.*/
if (msc_decode(usbp)) {
if (CBW.dCBWDataTransferLength == 0) {
CSW.bCSWStatus = MSC_CSW_STATUS_FAILED;
CSW.dCSWDataResidue = 0;
msc_sendstatus(usbp);
return;
}
goto stall_both;
}
/* Commands with zero transfer length, 5.1.*/
if (CBW.dCBWDataTransferLength == 0) {
msc_sendstatus(usbp);
return;
}
/* Transfer direction.*/
if (CBW.bmCBWFlags & 0x80) {
/* IN, Device to Host.*/
msc_state = MSC_DATA_IN;
}
else {
/* OUT, Host to Device.*/
msc_state = MSC_DATA_OUT;
}
break;
case MSC_DATA_OUT:
break;
default:
;
}
return;
stall_out:
msc_state = MSC_ERROR;
chSysLockFromIsr();
usbStallReceiveI(usbp, ep);
chSysUnlockFromIsr();
return;
stall_both:
msc_state = MSC_ERROR;
chSysLockFromIsr();
usbStallTransmitI(usbp, ep);
usbStallReceiveI(usbp, ep);
chSysUnlockFromIsr();
return;
}
/**
* @brief Default EP0 OUT callback.
* @details This function is used by the low level driver as default handler
* for EP0 OUT events.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number, always zero
*
* @notapi
*/
void _usb_ep0out(USBDriver *usbp, usbep_t ep) {
(void)ep;
switch (usbp->ep0state) {
case USB_EP0_RX:
/* Receive phase over, sending the zero sized status packet.*/
usbp->ep0state = USB_EP0_SENDING_STS;
#if (USB_EP0_STATUS_STAGE == USB_EP0_STATUS_STAGE_SW)
usbPrepareTransmit(usbp, 0, NULL, 0);
osalSysLockFromISR();
(void) usbStartTransmitI(usbp, 0);
osalSysUnlockFromISR();
#else
usb_lld_end_setup(usbp, ep);
#endif
return;
case USB_EP0_WAITING_STS:
/* Status packet received, it must be zero sized, invoking the callback
if defined.*/
#if (USB_EP0_STATUS_STAGE == USB_EP0_STATUS_STAGE_SW)
if (usbGetReceiveTransactionSizeI(usbp, 0) != 0U) {
break;
}
#endif
if (usbp->ep0endcb != NULL) {
usbp->ep0endcb(usbp);
}
usbp->ep0state = USB_EP0_WAITING_SETUP;
return;
case USB_EP0_WAITING_SETUP:
case USB_EP0_TX:
case USB_EP0_WAITING_TX0:
case USB_EP0_SENDING_STS:
/* All the above are invalid states in the IN phase.*/
osalDbgAssert(false, "EP0 state machine error");
/* Falling through is intentional.*/
case USB_EP0_ERROR:
/* Error response, the state machine goes into an error state, the low
level layer will have to reset it to USB_EP0_WAITING_SETUP after
receiving a SETUP packet.*/
usb_lld_stall_in(usbp, 0);
usb_lld_stall_out(usbp, 0);
_usb_isr_invoke_event_cb(usbp, USB_EVENT_STALLED);
usbp->ep0state = USB_EP0_ERROR;
return;
default:
osalDbgAssert(false, "EP0 state machine invalid state");
}
}
