/*! \brief Main loop.
*
* Most of the action is interrupt driven. This loop only detects USB suspension.
*
* @return Never exits
*/
void main(void) {
init();
for(;;){
wait100us();
suspend_timer++;
if (suspend_timer>=SUSPEND_TIME) {
/* host is not sending keepalive signals, time to suspend all operation */
/* BDM is in idle mode when not communicating, so nothing to do there */
U16 i;
/* Acknowledge any pending interrupt and disable KBD interrupts; */
/* This will prevent RESET activity waking us up out of stop */
KBSCR = KBSCR_IMASKK_MASK | KBSCR_ACKK_MASK;
led_state=LED_OFF; /* switch the LED off */
GREEN_LED_OFF(); /* do it now, the interrupt which would do it normally is not going to come */
UIR0_SUSPND=1; /* suspend USB */
while (suspend_timer) asm(STOP); /* go to sleep, wait for USB resume or reset */
for (i=0;i<RESUME_RECOVERY;i++) wait100us(); /* wait for host to recover */
led_state=LED_ON; /* Switch the LED back on */
(void)bdm_init(); /* Reinitialise the BDM after wake-up as the device might */
/* have been disconected in the meantime; assume nothing */
}
}
unsigned int ReadADC(uint8_t Probe)
{
unsigned int U; /* return value (mV) */
uint8_t samples; /* loop counter */
unsigned long Value; /* ADC value */
uint8_t StartADCmsk; /* Bit mask to start the ADC */
Probe |= (1 << REFS0); /* use internal reference anyway */
#ifdef AUTOSCALE_ADC
sample:
#endif
ADMUX = Probe; /* set input channel and U reference */
#ifdef AUTOSCALE_ADC
/* if voltage reference changes, wait for voltage stabilization */
samples = (Probe & (1 << REFS1)); // get REFS1 bit flag
if (samples != ADCconfig.RefFlag) {
ADCconfig.RefFlag = samples; // update flag
// switch to 1.1V Reference
#ifdef NO_AREF_CAP
wait100us(); /* time for voltage stabilization */
#else
wait_about10ms(); /* time for voltage stabilization */
#endif
// always do one dummy read of ADC, 112us
StartADCwait(); /* start ADC and wait */
}
#endif
/* sample ADC readings */
Value = 0UL; /* reset sampling variable */
samples = 0; /* number of samples to take */
while (samples < ADCconfig.Samples) /* take samples */
{
StartADCwait();
/* start ADC and wait */
Value += ADCW; /* add ADC reading */
#ifdef AUTOSCALE_ADC
/* auto-switch voltage reference for low readings */
if ((samples == 4) && (ADCconfig.U_Bandgap > 255) && ((uint16_t)Value < 1024) && !(Probe & (1 << REFS1)))
{
Probe |= (1 << REFS1); /* select internal bandgap reference */
#if (PROCESSOR_TYP == 644) || (PROCESSOR_TYP == 1280)
Probe &= ~(1 << REFS0); /* ATmega640/1280/2560 1.1V Reference with REFS0=0 */
#endif
goto sample; /* re-run sampling */
}
#endif
samples++; /* one more done */
}
#ifdef AUTOSCALE_ADC
/* * convert ADC reading to voltage * - single sample: U = ADC reading * U_ref / 1024 */
/* get voltage of reference used */
if (Probe & (1 << REFS1))
U = ADCconfig.U_Bandgap; /* bandgap reference */
else
U = ADCconfig.U_AVCC; /* Vcc reference */
#else
U = ADCconfig.U_AVCC; /* Vcc reference */
#endif
/* convert to voltage; */
Value *= U; /* ADC readings * U_ref */
Value /= 1023; /* / 1024 for 10bit ADC */
/* de-sample to get average voltage */
Value /= ADCconfig.Samples;
U = (unsigned int) Value;
return U;
//return ((unsigned int)(Value / (1023 * (unsigned long)ADCconfig.Samples)));
}
