//*****************************************************************************
//
//! Start a DMA transfer and wait for it to finish.
//!
//! This function will perform the steps necessary to initiate a DMA transfer
//! It waits until the transfer is complete before returning to the caller.
//!
//! \param ulChannel DMA Channel
//!
//! \return Zero if there is no error
//
//*****************************************************************************
unsigned long
StartAndCompleteSWTransfer(unsigned long ulChannel)
{
unsigned long ulIdx;
//
// Clear interrupt status
//
MAP_uDMAIntClear(0xffffffff);
MAP_uDMAChannelRequest(ulChannel);
//
// Wait for the mode to change to stopped
//
ulIdx = 0;
while(MAP_uDMAChannelModeGet(ulChannel) != UDMA_MODE_STOP)
{
ulIdx++;
if(ulIdx > 200000)
{
break;
}
}
if(MAP_uDMAChannelIsEnabled(ulChannel))
{
UART_PRINT("Error, channel was enabled at end of transfer\n");
return 1;
}
UART_PRINT("Transfer complete \n\r");
return(0);
}
//*****************************************************************************
//
//! Start the DMA SW transfer
//!
//! \param None
//!
//! This function
//! 1. Starts the SW controlled uDMA transfer
//!
//! \return None.
//
//*****************************************************************************
void UDMAStartTransfer(unsigned long ulChannel)
{
//
// Request for channel transfer
//
MAP_uDMAChannelRequest(ulChannel);
}
//*****************************************************************************
//!
//! Initialize Scatter Gather DMA Transfer
//!
//! \param None
//!
//! \return None
//!
//*****************************************************************************
void
InitSGTransfer()
{
int i;
char * pvSrcBuf,*pvDstBuf;
//
// Source Buffer
//
pvSrcBuf=malloc(BUFF_SIZE);
if(pvSrcBuf == NULL)
{
UART_PRINT("Failed to allocate Src buffer\n\r");
return ;
}
for(i=0;i<BUFF_SIZE;i++)
*(pvSrcBuf+i)=i;
MAP_uDMAChannelAssign(UDMA_CH0_SW);
MAP_uDMAChannelAttributeDisable(UDMA_CH0_SW,UDMA_ATTR_ALTSELECT);
iDone=0;
pvDstBuf=malloc(BUFF_SIZE);
if(pvDstBuf == NULL)
{
UART_PRINT("Failed to allocate Dst buffer\n\r");
return ;
}
//
// Call to Set Up Scatter Gather Mode Transfer
//
SetupSGMemTransfer(UDMA_CH0_SW,pvSrcBuf,pvSrcBuf+BUFF_SIZE/2,
pvDstBuf,BUFF_SIZE/2);
MAP_uDMAChannelRequest(UDMA_CH0_SW);
//
// Checking for the Completion
//
while(!iDone);
//
// Checking Correctness of SG Transfer
//
if(memcmp(pvSrcBuf,pvDstBuf,BUFF_SIZE)==0)
UART_PRINT("SG Mode Memory to Memory Transfer Completed \n\r\n\r");
else
UART_PRINT("SG Mode Memory to Memory Transfer Failed! \n\r\n\r");
free(pvDstBuf);
}
