//------------------------------------------------------------------------------
/// 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;
}
//------------------------------------------------------------------------------
/// Initializes the DMA controller.
/// \param dwChannel Particular dwChannel number
/// \param defaultHandler Using the default dmad interrupt handler.
//------------------------------------------------------------------------------
extern void DMAD_Initialize( uint32_t dwChannel, uint32_t defaultHandler )
{
uint32_t dwStatus ;
uint32_t dwFlag ;
/* Enable peripheral clock */
PMC_EnablePeripheral( ID_DMAC ) ;
/* Read the dwChannel handler status to ensure the channel is a free channel */
dwStatus = DMA_GetChannelStatus( DMAC ) ;
TRACE_INFO( "DMAD_Initialize dwChannel %x \n\r", dwChannel ) ;
assert( (dwStatus & (1 << dwChannel)) == 0 ) ;
/* Clear any pending interrupts on the channel */
DMA_GetStatus( DMAC ) ;
/* Disable the channel */
DMA_DisableChannel( DMAC, dwChannel ) ;
/* Disable the interrupt */
dwFlag = 0x3FFFFF ;
DMA_DisableIt( DMAC, dwFlag ) ;
/* Enable DMA */
DMA_Enable( DMAC ) ;
if ( defaultHandler )
{
NVIC_EnableIRQ( DMAC_IRQn ) ;
}
// Initialize transfer instance.
dmad.transfers[dwChannel].transferSize = 0;
}
//------------------------------------------------------------------------------
//./ Configure the DMA Channels: 0 RX, 1 TX.
//./ Channels are disabled after configure.
//------------------------------------------------------------------------------
static void configureDmaChannels(void)
{
// Enable DMA Peripheral
PERIPH_ENABLE(AT91C_ID_HDMA);
// Enable DMA
DMA_Enable();
// Free status
DMA_DisableIt(0xFFFFFFFF);
DMA_GetChannelStatus();
DMA_GetStatus();
DMA_DisableChannels((1 << DMA_CHANNEL_0) | (1 << DMA_CHANNEL_1));
// RX channel 0
DMA_SetConfiguration(DMA_CHANNEL_0,
AT91C_HDMA_SRC_PER_2
| AT91C_HDMA_DST_PER_2
| AT91C_HDMA_SRC_H2SEL_HW
| AT91C_HDMA_DST_H2SEL_SW
| AT91C_HDMA_SOD_ENABLE
| AT91C_HDMA_FIFOCFG_LARGESTBURST
);
// TX channel 1
DMA_SetConfiguration(DMA_CHANNEL_1,
AT91C_HDMA_SRC_PER_1
| AT91C_HDMA_DST_PER_1
| AT91C_HDMA_SRC_H2SEL_SW
| AT91C_HDMA_DST_H2SEL_HW
| AT91C_HDMA_SOD_ENABLE
| AT91C_HDMA_FIFOCFG_LARGESTBURST
);
}
//------------------------------------------------------------------------------
/// 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;
}
//------------------------------------------------------------------------------
/// Initializes the DMA controller.
/// \param channel Particular channel number
/// \param defaultHandler Using the default dmad interrupt handler.
//------------------------------------------------------------------------------
void DMAD_Initialize(unsigned char channel, unsigned char defaultHandler)
{
unsigned int status;
unsigned int flag;
// Enable peripheral clock
#if !defined(at91sam9rl64)
AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_HDMA;
#endif
// Read the channel handler status to ensure the channel is a free channel.
status = DMA_GetChannelStatus();
TRACE_INFO ("DMAD_Initialize channel %x \n\r", channel);
SANITY_CHECK(!(status & (1 << channel)));
// Clear any pending interrupts on the channel.
DMA_GetStatus();
// Disble the channel.
DMA_DisableChannel(channel);
// Disable the interrupt
flag = 0xffffff;
DMA_DisableIt(flag);
// Enable DMA.
DMA_Enable();
if(defaultHandler)
{
IRQ_ConfigureIT(AT91C_ID_HDMA, 0, DMAD_Handler);
IRQ_EnableIT(AT91C_ID_HDMA);
}
// Initialize transfer instance.
dmad.transfers[channel].transferSize = 0;
}
//------------------------------------------------------------------------------
/// Returns 1 if no transfer is currently pending on the given channel;
/// otherwise, returns 0.
/// \param channel Channel number.
//------------------------------------------------------------------------------
//unsigned char DMAD_IsFinished(unsigned char channel)
//{
// SANITY_CHECK(channel <= DMA_CHANNEL_NUM);
//
// if (dmad.transfers[channel].transferSize > 0) {
// return 0;
// }
// else {
// DMA_DisableChannel(channel);
// return 1;
// }
//}
unsigned char DMAD_IsFinished(unsigned char channel)
{
SANITY_CHECK(channel <= DMA_CHANNEL_NUM);
if ( (DMA_GetChannelStatus() & (DMA_ENA << channel)) == (DMA_ENA << channel)) {
return 0;
} else {
//DMA_DisableChannel(channel);
return 1;
}
}
//------------------------------------------------------------------------------
/// 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 ;
}