/**************************************************************************//**
* @brief Main function
* This exmaple sets up the TIMER to trigger the ADC through PRS at a set
* interval. The ADC then sets a DMA request and the DMA fetches each sample
* until the a set number of samples have been received.
*****************************************************************************/
int main(void)
{
/* Initialize chip */
CHIP_Init();
/* Configuring clocks in the Clock Management Unit (CMU) */
setupCmu();
/* Configure DMA transfer from ADC to RAM */
setupDma();
/* Configure ADC Sampling and TIMER trigger through PRS. Start TIMER as well */
setupAdc();
/* Enter EM1 while DMA transfer is active to save power. Note that
* interrupts are disabled to prevent the ISR from being triggered
* after checking the transferActive flag, but before entering
* sleep. If this were to happen, there would be no interrupt to wake
* the core again and the MCU would be stuck in EM1. While the
* core is in sleep, pending interrupts will still wake up the
* core and the ISR will be triggered after interrupts are enabled
* again.
*/
while(1)
{
INT_Disable();
if ( transferActive )
{
EMU_EnterEM1();
}
INT_Enable();
/* Exit the loop if transfer has completed */
if ( !transferActive )
{
break;
}
}
/* Cleaning up after DMA transfers */
DMA_Reset();
/* Done */
while (1);
}
static void setup(void)
{
// Port setup
PORTD = KEY; //key pullup & led off
DDRD = LED; // led output
PORTB &= ~OUT1;
DDRB = OUT2 | SS;
TIMSK1 |= (1 << TOIE1); // Enable overflow interrupt
TCCR1B |= (1 << CS11); // Start timer at Fcpu/8
setupLine();
#ifdef ADC_ENABLED
setupAdc();
#endif //ADCENABLED
#ifdef GPS_ENABLED
setupGps();
#endif //GPS_ENABLED
sei();
}
