AVR Freaks

Has someone used timer1 input compare triggered by analog compare?

Now the setup working is:
TCCR1B=0x04
TIMSK1=0x20
ACSR=0x0E

// Analog Comparator initialization
// Analog Comparator: On
// Digital input buffers on AIN0: Off, AIN1: Off
DIDR1=0x03;
// Analog Comparator Input Capture by Timer/Counter 1: On
ACSR=0x04;
ADCSRB=0x00;
...
			TCCR1A = 0;						// Normal mode, no connected pins

			TCCR1B =	(1 << ICES1) |		// Input capture edge select--rising
						(1 << CS10);	 	// Normal mode; prescaler of 1
...
					// Set up the ICP on timer1, routed from analog comparator
					TIFR1 = (1 << ICF1);	// clear any previous trigger ...
					TIMSK1 |= (1 << ICIE1);	// ... and go!

No I don't use analog input compare int. Correct.

A deeper reading of data sheet (page 243 and 115) seems timer1 handles as not mutual exclusion the two source.
ICP1 pin is always connected to Timer1 internal icp circuit and analog compare int source may be connected, like or logic gate...

I'm wrong?

#include 
#include 
#include 

volatile uint8_t compf = 0;
volatile uint8_t captf = 0;

ISR(ANALOG_COMP_vect) {
  compf = 1;
}

ISR(TIMER1_CAPT_vect) {
  captf = 1;
}

int __attribute__ ((__OS_main__)) main(void) {

  // Debug serial (use your own routines)
  serial_configure();

  // ICP1 and AIN1 outputs
  DDRD |= (1<<PD7);
  DDRB |= (1<<PB0);
  
  // Mode 0, prescaler = 256, capture on falling edge
  TCCR1B = (1<<CS12);
  TIMSK1 = (1<<ICIE1);
  
  // AIN0 = Vbg, ACO to input capture
  ACSR = (1<<ACBG) | (1<<ACIE) | (1<<ACIC) | (1<<ACIS1);
  
  // Clear all flags before beginning
  TIFR1 = (1<<ICF1);
  ACSR |= (1<<ACI);
  sei();
  
  // Loop
  while(1) {
    // Report
    printf("AIN1=%d ICP1=%d ACSR=0x%02X ICR1=0x%04X compf=%d captf=%d\r\n",
           !!(PIND&(1<<PD7)), !!(PINB&(1<<PB0)), ACSR, ICR1, compf, captf);
    // Clear flags
    compf = 0;
    captf = 0;
    PIND = (1<<PD7);  // Toggle AIN1
    //PINB = (1<<PB0);  // Toggle ICP1
  }

}

AIN1=0 ICP1=0 ACSR=0x6E ICR1=0x0000 compf=0 captf=0
AIN1=1 ICP1=0 ACSR=0x4E ICR1=0x0F00 compf=1 captf=1
AIN1=0 ICP1=0 ACSR=0x6E ICR1=0x0F00 compf=0 captf=0
AIN1=1 ICP1=0 ACSR=0x4E ICR1=0x2D03 compf=1 captf=1

    //PIND = (1<<PD7);  // Toggle AIN1
    PINB = (1<<PB0);  // Toggle ICP1

AIN1=0 ICP1=0 ACSR=0x6E ICR1=0x0000 compf=0 captf=0
AIN1=0 ICP1=1 ACSR=0x6E ICR1=0x0000 compf=0 captf=0
AIN1=0 ICP1=0 ACSR=0x6E ICR1=0x0000 compf=0 captf=0
AIN1=0 ICP1=1 ACSR=0x6E ICR1=0x0000 compf=0 captf=0

Then I have to disable ICP1 int when I have to change PORTB.0 clear Int flag and re-arm it...

Good job ATMEL! :evil:

///////////////////////////////////////////////////////////////////////////////

Good job ATMEL reference to indicate the clear explanation how works analog comparator ICP1 on data sheet.

16.2.1 Registers
The Timer/Counter (TCNT1), Output Compare Registers (OCR1A/B), and Input Capture Register (ICR1) are all 16-bit registers. ...

The Input Capture Register can capture the Timer/Counter value at a given external (edge triggered) event on either the Input Capture pin (ICP1) or on the Analog Comparator pins (See ”Analog Comparator” on page 239) The Input Capture unit includes a digital filtering unit (Noise Canceler) for reducing the chance of capturing noise spikes.

An Input Capture can be triggered by software by controlling the port of the ICP1 pin.

Cleared this, I discover

Code:
ACSR&=~(1<<ACIC)