//------------------------------------------------------------------------------
/// 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;
}
//------------------------------------------------------------------------------
// 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);
}
}
}
}
//------------------------------------------------------------------------------
//./ 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
);
}
//------------------------------------------------------------------------------
/// 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;
}
//------------------------------------------------------------------------------
// 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 ) ;
}
}
}
}
//------------------------------------------------------------------------------
/// Initializes the DMA controller.
/// \param channel Particular channel number
/// \param defaultHandler Using the default dmad interrupt handler.
//------------------------------------------------------------------------------
void DMAD_Initialize(U8 channel, U8 defaultHandler)
{
// U32 status;
U32 flag;
// status = DMA_GetChannelStatus(); // Read the channel handler status to ensure the channel is a free channel.
// DEBUG_MSG("DMAD_Initialize channel: %x, Status: %x", channel, status);
DMA_GetStatus(); // Clear any pending interrupts on the channel.
DMA_DisableChannel(channel); // Disble the channel.
flag = 0xffffff;
DMA_DisableIt(flag); // Disable the interrupt
DMA_Enable(); // Enable DMA.
if(defaultHandler)
{
IRQ_PeriConf(21, 0, DMAD_Handler);
IRQ_PeriEn(21);
}
dmad.transfers[channel].transferSize = 0; // Initialize transfer instance.
}
//------------------------------------------------------------------------------
/// 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.
}
}
}
}
