//------------------------------------------------------------------------------
// Local functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// This handler function must be called by the DMAC interrupt service routine.
/// Identifies which event was activated and calls the associated function.
//------------------------------------------------------------------------------
void DMAD_Handler()
{
unsigned int status;
unsigned char channel;
DmaTransfer *pTransfer;
status = DMA_GetStatus();
// Check if the buffer transfer completed is set.
if(status & AT91C_BTC)
{
// Scan each channel status.
for(channel = 0; channel < DMA_CHANNEL_NUM; channel++) {
if(!(status & (DMA_BTC << channel))){
continue;
}
dmad.transfers[channel].transferSize -= dmad.transfers[channel].bufSize;
// if next buffer is to be the last buffer in the transfer, then clear the automatic mode bit.
if(dmad.transfers[channel].transferSize <= dmad.transfers[channel].bufSize) {
DMA_ClearAutoMode(channel);
}
// Transfer finished
if(dmad.transfers[channel].transferSize == 0) {
pTransfer = &(dmad.transfers[channel]);
pTransfer->callback();
DMA_DisableIt(DMA_BTC << channel);
DMA_DisableChannel(channel);
}
else
{
// Write the KEEPON field to clear the STALL states.
DMA_KeeponChannel(channel);
}
}
}
}
//------------------------------------------------------------------------------
/// Starts buffer transfer on the given channel
/// \param channel Particular channel number.
/// \param size Total transfer size in byte.
/// \param callback Optional callback function.
/// \param polling Polling channel status enable.
//------------------------------------------------------------------------------
unsigned char DMAD_BufferTransfer(unsigned char channel,
unsigned int size,
DmaCallback callback,
unsigned char polling)
{
DmaTransfer *pTransfer = &(dmad.transfers[channel]);
// Check that no transfer is pending on the channel
if (pTransfer-> transferSize > 0 ) {
TRACE_ERROR("DAM transfer is already pending\n\r");
return DMAD_ERROR_BUSY;
}
pTransfer->status = DMAD_ERROR_BUSY;
pTransfer->transferSize = size;
pTransfer->callback = callback;
if(!polling){
DMA_EnableIt(DMA_BTC << channel);
}
// Enable the channel.
DMA_EnableChannel(channel);
if(polling){
while ((DMA_GetChannelStatus() & (DMA_ENA << channel)) == (DMA_ENA << channel));
pTransfer->callback();
DMA_DisableChannel(channel);
}
return 0;
}
//------------------------------------------------------------------------------
/// Starts buffer transfer on the given channel
/// \param channel Particular channel number.
/// \param size Total transfer size in byte.
/// \param callback Optional callback function.
/// \param polling Polling channel status enable.
//------------------------------------------------------------------------------
U8 DMAD_BufferTransfer(U8 channel, U32 size, DmaCallback callback, U8 polling)
{
DmaTransfer *pTransfer = &(dmad.transfers[channel]);
if (pTransfer-> transferSize > 0 ) // Check that no transfer is pending on the channel
{
DEBUG_MSG("DAM transfer is already pending");
return DMAD_ERROR_BUSY;
}
pTransfer->status = DMAD_ERROR_BUSY;
pTransfer->transferSize = size;
pTransfer->callback = callback;
if(!polling)
{
DMA_EnableIt(0x1 << channel);
}
DMA_EnableChannel(channel); // Enable the channel.
if(polling)
{
while ((DMA_GetChannelStatus() & (0x1 << channel)) == (0x1 << channel));
if (pTransfer->callback)
{
pTransfer->callback();
}
pTransfer->transferSize = 0;
DMA_DisableChannel(channel);
}
return 0;
}
//------------------------------------------------------------------------------
// Local functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// This handler function must be called by the DMAC interrupt service routine.
/// Identifies which event was activated and calls the associated function.
//------------------------------------------------------------------------------
extern void DMAC_IrqHandler( void )
{
uint32_t dwStatus ;
uint32_t dwChannel ;
DmaTransfer *pTransfer ;
dwStatus = DMA_GetStatus( DMAC ) ;
// Check if the buffer transfer completed is set.
if ( dwStatus & (DMAC_EBCISR_BTC0|DMAC_EBCISR_BTC1|DMAC_EBCISR_BTC2|DMAC_EBCISR_BTC3|DMAC_EBCISR_BTC4|DMAC_EBCISR_BTC5) )
{
// Scan each dwChannel status.
for ( dwChannel = 0 ; dwChannel < DMA_CHANNEL_NUM ; dwChannel++ )
{
if ( !(dwStatus & (DMAC_EBCISR_BTC0 << dwChannel)) )
{
continue ;
}
dmad.transfers[dwChannel].transferSize -= dmad.transfers[dwChannel].bufSize ;
// if next buffer is to be the last buffer in the transfer, then clear the automatic mode bit.
if ( dmad.transfers[dwChannel].transferSize <= dmad.transfers[dwChannel].bufSize )
{
DMA_ClearAutoMode( DMAC, dwChannel ) ;
}
// Transfer finished
if ( dmad.transfers[dwChannel].transferSize == 0 )
{
pTransfer = &(dmad.transfers[dwChannel]) ;
pTransfer->callback() ;
DMA_DisableIt( DMAC, DMAC_EBCIDR_BTC0 << dwChannel ) ;
DMA_DisableChannel( DMAC, dwChannel ) ;
}
else
{
// Write the KEEPON field to clear the STALL states.
DMA_KeeponChannel( DMAC, dwChannel ) ;
}
}
}
}
//------------------------------------------------------------------------------
/// Starts buffer transfer on the given dwChannel
/// \param dwChannel Particular dwChannel number.
/// \param size Total transfer size in byte.
/// \param callback Optional callback function.
/// \param polling Polling dwChannel status enable.
//------------------------------------------------------------------------------
extern uint32_t DMAD_BufferTransfer( uint32_t dwChannel, uint32_t dwSize,
DmaCallback callback, uint32_t dwPolling )
{
DmaTransfer *pTransfer = &(dmad.transfers[dwChannel]) ;
// Check that no transfer is pending on the dwChannel
if ( pTransfer-> transferSize > 0 )
{
TRACE_ERROR( "DAM transfer is already pending\n\r" ) ;
return DMAD_ERROR_BUSY ;
}
pTransfer->status = DMAD_ERROR_BUSY ;
pTransfer->transferSize = dwSize ;
pTransfer->callback = callback ;
if ( dwPolling == 0 )
{
DMA_EnableIt( DMAC, DMA_BTC << dwChannel ) ;
}
// Enable the dwChannel.
DMA_EnableChannel( DMAC, dwChannel ) ;
if ( dwPolling != 0 )
{
while ( (DMA_GetChannelStatus( DMAC ) & (DMAC_CHSR_ENA0 << dwChannel)) == (DMAC_CHSR_ENA0 << dwChannel)) ;
if ( pTransfer->callback )
{
pTransfer->callback() ;
}
pTransfer->transferSize = 0 ;
DMA_DisableChannel( DMAC, dwChannel ) ;
}
return 0 ;
}
//------------------------------------------------------------------------------
/// This handler function must be called by the DMAC interrupt service routine.
/// Identifies which event was activated and calls the associated function.
//------------------------------------------------------------------------------
void DMAD_Handler()
{
U32 status;
U8 channel;
DmaTransfer *pTransfer;
status = DMA_GetStatus();
if(status & (0xFF)) // Check if the buffer transfer completed is set.
{
for(channel = 0; channel < 8; channel++) // Scan each channel status.
{
if(!(status & (0x1 << channel)))
{
continue;
}
dmad.transfers[channel].transferSize -= dmad.transfers[channel].bufSize;
if(dmad.transfers[channel].transferSize <= dmad.transfers[channel].bufSize) // if next buffer is to be the last buffer in the transfer, then clear the automatic mode bit.
{
DMA_ClearAutoMode(channel);
}
if(dmad.transfers[channel].transferSize == 0) // Transfer finished
{
pTransfer = &(dmad.transfers[channel]);
pTransfer->callback();
DMA_DisableIt(0x1 << channel);
DMA_DisableChannel(channel);
}
else
{
DMA_KeeponChannel(channel); // Write the KEEPON field to clear the STALL states.
}
}
}
}
