/**
*
* This is the Receive handler function for examples 1 and 2.
* It will increment a shared counter, receive and validate the frame.
*
* @param RxRingPtr is a pointer to the DMA ring instance.
*
* @return None.
*
* @note None.
*
******************************************************************************/
static void RxIntrHandler(XLlDma_BdRing * RxRingPtr)
{
u32 IrqStatus;
/* Read pending interrupts */
IrqStatus = XLlDma_BdRingGetIrq(RxRingPtr);
/* Acknowledge pending interrupts */
XLlDma_BdRingAckIrq(RxRingPtr, IrqStatus);
/* If error interrupt is asserted, raise error flag, reset the
* hardware to recover from the error, and return with no further
* processing.
*/
if ((IrqStatus & XLLDMA_IRQ_ALL_ERR_MASK)) {
DeviceErrors++;
TemacUtilErrorTrap ("LlDma: Error: IrqStatus & XLLDMA_IRQ_ALL_ERR_MASK");
XLlDma_Reset(&DmaInstance);
return;
}
/*
* If Reception done interrupt is asserted, call RX call back function
* to handle the processed BDs and then raise the according flag.
*/
if ((IrqStatus & (XLLDMA_IRQ_DELAY_MASK | XLLDMA_IRQ_COALESCE_MASK))) {
RxCallBack(RxRingPtr);
}
}
/**
* This function initializes a DMA engine. This function must be called
* prior to using a DMA engine. Initialization of a engine includes setting
* up the register base address, setting up the instance data, and ensuring the
* hardware is in a quiescent state.
*
* @param InstancePtr is a pointer to the DMA engine instance to be worked on.
* @param BaseAddress is where the registers for this engine can be found.
* If address translation is being used, then this parameter must
* reflect the virtual base address.
* @return None.
*
*****************************************************************************/
void XLlDma_Initialize(XLlDma * InstancePtr, u32 BaseAddress)
{
/* Setup the instance */
memset(InstancePtr, 0, sizeof(XLlDma));
InstancePtr->RegBase = BaseAddress;
/* Initialize the ring structures */
InstancePtr->TxBdRing.RunState = XST_DMA_SG_IS_STOPPED;
InstancePtr->TxBdRing.ChanBase = BaseAddress + XLLDMA_TX_OFFSET;
InstancePtr->TxBdRing.IsRxChannel = 0;
InstancePtr->RxBdRing.RunState = XST_DMA_SG_IS_STOPPED;
InstancePtr->RxBdRing.ChanBase = BaseAddress + XLLDMA_RX_OFFSET;
InstancePtr->RxBdRing.IsRxChannel = 1;
/* Reset the device and return */
XLlDma_Reset(InstancePtr);
}
