//------------------------------------------------------------------------------
/// 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;
}
//------------------------------------------------------------------------------
// 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);
}
}
}
}
//------------------------------------------------------------------------------
/// 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;
}
//------------------------------------------------------------------------------
/// 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;
}
}
//------------------------------------------------------------------------------
/// Returns 1 if no transfer is currently pending on the given channel;
/// otherwise, returns 0.
/// \param channel Channel number.
//------------------------------------------------------------------------------
U8 DMAD_IsFinished(U8 channel)
{
if(dmad.transfers[channel].transferSize > 0)
{
return 0;
}
else
{
DMA_DisableChannel(channel);
return 1;
}
}
//------------------------------------------------------------------------------
/// Returns 1 if no transfer is currently pending on the given dwChannel;
/// otherwise, returns 0.
/// \param dwChannel Channel number.
//------------------------------------------------------------------------------
extern uint32_t DMAD_IsFinished( uint32_t dwChannel )
{
assert( dwChannel <= DMA_CHANNEL_NUM ) ;
if ( dmad.transfers[dwChannel].transferSize > 0 )
{
return 0 ;
}
else
{
DMA_DisableChannel( DMAC, dwChannel ) ;
return 1 ;
}
}
//------------------------------------------------------------------------------
// 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.
}
//------------------------------------------------------------------------------
/// 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.
}
}
}
}
int main(void)
{
facilitatePowersaving();
// Configure switches
PORTCFG.MPCMASK = 0xff; // Configure several PINxCTRL registers at the same time
SWITCHPORT.PIN0CTRL = (SWITCHPORT.PIN0CTRL & ~PORT_OPC_gm) | PORT_OPC_PULLUP_gc; //Enable pull-up to get a defined level on the switches
SWITCHPORT.DIRCLR = 0xff; // Set port as input
// Configure LEDs
PORTCFG.MPCMASK = 0xff; // Configure several PINxCTRL registers at the same time
LEDPORT.PIN0CTRL = PORT_INVEN_bm; // Invert input to turn the leds on when port output value is 1
LEDPORT.DIRSET = 0xff; // Set port as output
LEDPORT.OUT = 0x00; // Set initial value
// Set up ADCB0 on PB0 to read temp sensor. More of this can be achieved by using driver from appnote AVR1300
PORTQ.PIN2CTRL = (PORTQ.PIN2CTRL & ~PORT_OPC_gm) | PORT_OPC_PULLDOWN_gc; // This pin must be grounded to "enable" NTC-resistor
PORTB.DIRCLR = PIN0;
PORTB.PIN0CTRL = (PORTB.PIN0CTRL & ~PORT_OPC_gm);
ADC_CalibrationValues_Load(&ADCB); // Load factory calibration data for ADC
ADCB.CH0.CTRL = (ADCB.CH0.CTRL & ~ADC_CH_INPUTMODE_gm) | ADC_CH_INPUTMODE_SINGLEENDED_gc; // Single ended input
ADCB.CH0.MUXCTRL = (ADCB.CH0.MUXCTRL & ~ADC_CH_MUXPOS_gm) | ADC_CH_MUXPOS_PIN0_gc; // Pin 0 is input
ADCB.REFCTRL = (ADCB.REFCTRL & ~ADC_REFSEL_gm) | ADC_REFSEL_VCC_gc; // Internal AVCC/1.6 as reference
ADCB.CTRLB |= ADC_FREERUN_bm; // Free running mode
ADCB.PRESCALER = (ADCB.PRESCALER & ~ADC_PRESCALER_gm) | ADC_PRESCALER_DIV512_gc; // Divide clock by 1024.
ADCB.CTRLB = (ADCB.CTRLB & ~ADC_RESOLUTION_gm) | ADC_RESOLUTION_8BIT_gc; // Set 8 bit resolution
ADCB.CTRLA |= ADC_ENABLE_bm; // Enable ADC
// Set up DMA CH0 to transfer from ADC to LEDS. We only read low byte.
DMA_Enable();
DMA_SetupBlock(
&DMA.CH0,
(void const *) &(ADCB.CH0RES),
DMA_CH_SRCRELOAD_NONE_gc,
DMA_CH_SRCDIR_FIXED_gc,
(void const *) &(LEDPORT.OUT),
DMA_CH_DESTRELOAD_NONE_gc,
DMA_CH_DESTDIR_FIXED_gc,
1,
DMA_CH_BURSTLEN_1BYTE_gc,
0,
true
);
DMA_EnableSingleShot( &DMA.CH0 );
DMA_SetTriggerSource( &DMA.CH0, DMA_CH_TRIGSRC_ADCB_CH0_gc ); // ADC Channel 0 is trigger source.
// Set up interrupt on button 0, or else we can't come back from IDLE
SWITCHPORT.INTCTRL = (SWITCHPORT.INTCTRL & ~PORT_INT0LVL_gm) | PORT_INT0LVL_LO_gc;
SWITCHPORT.INT0MASK = SWITCHMASK_ACTIVE;
SWITCHPORT.PIN0CTRL = (SWITCHPORT.PIN0CTRL & ~PORT_ISC_gm) | PORT_ISC_FALLING_gc;
// Enable low interrupt level in PMIC and enable global interrupts.
PMIC.CTRL |= PMIC_LOLVLEN_bm;
sei();
// Main loop.
while (1) {
if ((SWITCHPORT.IN & SWITCHMASK_ACTIVE) == 0x00)
{
// Button 0 pressed. Enter ACTIVE mode again.
DMA_DisableChannel( &DMA.CH0 );
SLEEP.CTRL &= ~SLEEP_SEN_bm; // Disable sleep. sleep() is now ineffective.
} else if ((SWITCHPORT.IN & SWITCHMASK_IDLE) == 0x00)
{
// Button 1 pressed. Enter Idle mode
DMA_EnableChannel( &DMA.CH0 );
// Set and enable sleep.
SLEEP.CTRL = (SLEEP.CTRL & ~SLEEP_SMODE_gm) | SLEEP_SMODE_IDLE_gc;
SLEEP.CTRL |= SLEEP_SEN_bm; // Enable sleep.
} else if (SLEEP.CTRL & SLEEP_SEN_bm) {
// We are in wanting-to-sleep mode, but were awake.
sleep();
} else {
// Do active sampling and transfer of ADC data.
LEDPORT.OUT = ADCB.CH0RES & 0xFF;
}
}
}
