/***************************************************************************//**
* @brief Handle Endpoint 2 OUT transfer interrupt
* @note This function takes no parameters, but it uses the EP2OUT status
* variables stored in @ref myUsbDevice.ep2out.
******************************************************************************/
void handleUsbOut2Int(void)
{
uint8_t count;
USB_Status_TypeDef status;
bool xferComplete = false;
USB_SetIndex(2);
if (USB_EpnOutGetSentStall())
{
USB_EpnOutClearSentStall();
}
else if (USB_EpnGetOutPacketReady())
{
count = USB_EpOutGetCount();
// If USBD_Read() has not been called, return an error
if (myUsbDevice.ep2out.state != D_EP_RECEIVING)
{
myUsbDevice.ep2out.misc.bits.outPacketPending = true;
status = USB_STATUS_EP_ERROR;
}
// Check for overrun of user buffer
else if (myUsbDevice.ep2out.remaining < count)
{
myUsbDevice.ep2out.state = D_EP_IDLE;
myUsbDevice.ep2out.misc.bits.outPacketPending = true;
status = USB_STATUS_EP_RX_BUFFER_OVERRUN;
}
else
{
USB_ReadFIFO(2, count, myUsbDevice.ep2out.buf);
myUsbDevice.ep2out.misc.bits.outPacketPending = false;
myUsbDevice.ep2out.remaining -= count;
myUsbDevice.ep2out.buf += count;
if ((myUsbDevice.ep2out.remaining == 0) || (count != SLAB_USB_EP2OUT_MAX_PACKET_SIZE))
{
myUsbDevice.ep2out.state = D_EP_IDLE;
xferComplete = true;
}
status = USB_STATUS_OK;
USB_EpnClearOutPacketReady();
}
if (myUsbDevice.ep2out.misc.bits.callback == true)
{
if (xferComplete == true)
{
myUsbDevice.ep2out.misc.bits.callback = false;
}
USBD_XferCompleteCb(EP2OUT, status, count, myUsbDevice.ep2out.remaining);
}
}
}
/***************************************************************************//**
* @brief Reads and formats a setup packet
******************************************************************************/
static void USB_ReadFIFOSetup(void)
{
uint16_t MEM_MODEL_SEG *ptr = &myUsbDevice.setup;
USB_ReadFIFO(0, 8, (uint8_t *)ptr);
USB_Ep0ServicedOutPacketReady();
// Modify for Endian-ness of the compiler
ptr[1] = le16toh(ptr[1]);
ptr[2] = le16toh(ptr[2]);
ptr[3] = le16toh(ptr[3]);
}
// ----------------------------------------------------------------------------
// If Isochronous mode is enabled and the max packet size is greater than 255,
// break the FIFO reads up into multiple reads of 255 or less bytes.
// ----------------------------------------------------------------------------
void USB_ReadFIFOIso(uint8_t fifoNum, uint16_t numBytes, uint8_t *dat)
{
uint8_t numBytesRead;
// USB_ReadFIFO() accepts a maximum of 255 bytes. If the number of bytes to
// send is greated than 255, call USB_ReadFIFO() multiple times.
while (numBytes > 0)
{
numBytesRead = (numBytes > 255) ? 255 : numBytes;
USB_ReadFIFO(fifoNum, numBytesRead, dat);
numBytes -= numBytesRead;
dat += numBytesRead;
}
}
/***************************************************************************//**
* @brief Handles receive data phase on Endpoint 0
******************************************************************************/
void handleUsbEp0Rx(void)
{
uint8_t count;
USB_Status_TypeDef status;
bool callback = myUsbDevice.ep0.misc.bits.callback;
// Get the number of bytes received
count = USB_Ep0GetCount();
// If the call to USBD_Read() did not give a large enough buffer to hold this
// data, set the outPacketPending flag and signal an RX overrun.
if (myUsbDevice.ep0.remaining < count)
{
myUsbDevice.ep0.state = D_EP_IDLE;
myUsbDevice.ep0.misc.bits.outPacketPending = true;
status = USB_STATUS_EP_RX_BUFFER_OVERRUN;
}
else
{
USB_ReadFIFO(0, count, myUsbDevice.ep0.buf);
myUsbDevice.ep0.buf += count;
myUsbDevice.ep0.remaining -= count;
status = USB_STATUS_OK;
// If the last packet of the transfer is exactly the maximum EP0 packet
// size, we will must wait to receive a ZLP (zero-length packet) after the
// last data packet. This signals that the host has completed the transfer.
// Check for the ZLP packet case here.
if ((myUsbDevice.ep0.remaining == 0) && (count != USB_EP0_SIZE))
{
USB_Ep0SetLastOutPacketReady();
myUsbDevice.ep0.state = D_EP_IDLE;
myUsbDevice.ep0.misc.bits.callback = false;
}
else
{
// Do not call USB_Ep0SetLastOutPacketReady() until we get the ZLP.
USB_Ep0ServicedOutPacketReady();
}
}
// Make callback if requested
if (callback == true)
{
USBD_XferCompleteCb(EP0, status, count, myUsbDevice.ep0.remaining);
}
}
/***************************************************************************//**
* @brief Handle Endpoint 3 OUT transfer interrupt
* @details Endpoint 3 OUT is the only OUT endpoint that supports
* isochronous transfers.
* @note This function takes no parameters, but it uses the EP3OUT status
* variables stored in @ref myUsbDevice.ep3out.
******************************************************************************/
void handleUsbOut3Int(void)
{
#if (SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_ISOC)
uint16_t nextIdx;
#if (SLAB_USB_EP3OUT_MAX_PACKET_SIZE > 255)
uint16_t count;
#else
uint8_t count;
#endif // ( SLAB_USB_EP3OUT_MAX_PACKET_SIZE > 255 )
#else
uint8_t count;
#endif // ( SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_ISOC )
USB_Status_TypeDef status;
bool xferComplete = false;
USB_SetIndex(3);
if (USB_EpnOutGetSentStall())
{
USB_EpnOutClearSentStall();
}
else if (USB_EpnGetOutPacketReady())
{
count = USB_EpOutGetCount();
// If USBD_Read() has not been called, return an error
if (myUsbDevice.ep3out.state != D_EP_RECEIVING)
{
myUsbDevice.ep3out.misc.bits.outPacketPending = true;
status = USB_STATUS_EP_ERROR;
}
#if ((SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_BULK) || (SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_INTR))
// Check for overrun of user buffer
else if (myUsbDevice.ep3out.remaining < count)
{
myUsbDevice.ep3out.state = D_EP_IDLE;
myUsbDevice.ep3out.misc.bits.outPacketPending = true;
status = USB_STATUS_EP_RX_BUFFER_OVERRUN;
}
#endif
else
{
#if ((SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_BULK) || (SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_INTR))
USB_ReadFIFO(3, count, myUsbDevice.ep3out.buf);
myUsbDevice.ep3out.remaining -= count;
myUsbDevice.ep3out.buf += count;
if ((myUsbDevice.ep3out.remaining == 0) || (count != SLAB_USB_EP3OUT_MAX_PACKET_SIZE))
{
myUsbDevice.ep3out.state = D_EP_IDLE;
xferComplete = true;
}
#elif (SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_ISOC)
nextIdx = count + myUsbDevice.ep3outIsoIdx;
// In isochronous mode, a circular buffer is used to hold the data
// If the next index into the circular buffer passes the end of the
// buffer, make two calls to USB_ReadFIFOIso()
if (nextIdx > myUsbDevice.ep3out.remaining)
{
USB_ReadFIFOIso(3, myUsbDevice.ep3out.remaining - myUsbDevice.ep3outIsoIdx, &myUsbDevice.ep3out.buf[myUsbDevice.ep3outIsoIdx]);
myUsbDevice.ep3outIsoIdx = nextIdx - myUsbDevice.ep3out.remaining;
USB_ReadFIFOIso(3, myUsbDevice.ep3outIsoIdx, myUsbDevice.ep3out.buf);
}
else
{
USB_ReadFIFOIso(3, count, &myUsbDevice.ep3out.buf[myUsbDevice.ep3outIsoIdx]);
myUsbDevice.ep3outIsoIdx = nextIdx;
}
#endif // ( ( SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_BULK ) || ( SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_INTR ) )
myUsbDevice.ep3out.misc.bits.outPacketPending = false;
status = USB_STATUS_OK;
USB_EpnClearOutPacketReady();
}
if (myUsbDevice.ep3out.misc.bits.callback == true)
{
if (xferComplete == true)
{
myUsbDevice.ep3out.misc.bits.callback = false;
}
#if ((SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_BULK) || (SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_INTR))
USBD_XferCompleteCb(EP3OUT, status, count, myUsbDevice.ep3out.remaining);
#elif (SLAB_USB_EP3OUT_TRANSFER_TYPE == USB_EPTYPE_ISOC)
// In Isochronous mode, the meaning of the USBD_XferCompleteCb parameters changes:
// xferred is the number of bytes received in the last packet
// remaining is the current index into the circular buffer
USBD_XferCompleteCb(EP3OUT, status, count, myUsbDevice.ep3outIsoIdx);
#endif
}
}
}
