pulseIn error attiny13a

[yudimoss]

I'm trying to use pulseIn at attiny13a while at attiny85 has working with same code but there have problem when uploading the sketch with code "sg=pulseIn(2,HIGH);" //at attiny85 its work error mesage " exit status 1 too few arguments to function 'uint32_t pulseIn(uint8_t, uint8_t, uint32_t)' " When I put timeout in the code "sg=pulseIn(2,HIGH,1000000);" it can uploading but not work properly Can you help me how to use pulseIn at attiny13a? Thank you

[rosiakpiotr]

This is related to #30. I had the same problem, pulseIn was not returning expected values. To fix:

First step is to calibrate internal oscillator if it is used by writing to OSCCAL register (I found proper value by experimenting - setting pin to HIGH then waiting with delayMicroseconds for some time and then setting the PIN low, running that in loop; I then check against oscilloscope when the time from delayMicroseconds matches my scope measurements of pulse width).

Then I used code proposed in #30 yielding new pulseIn implementation:

uint32_t pulseInx(uint8_t pin, uint8_t state, uint32_t timeout) 
{  
  uint32_t width = 0; // Keep initialization out of time critical area
  
  // Convert the timeout from microseconds to a number of times through
  // the initial loop; it takes 16 clock cycles per iteration.
  uint32_t numloops = 0;
  uint32_t maxloops = microsecondsToClockCycles(timeout) >> 4; // Divide by 16

  // Wait for any previous pulse to end
  while (!!(PINB & _BV(pin)) == state)
  {
    if(numloops++ == maxloops) {return 0;}
    asm("nop \n");  
    asm("nop \n");
  }
  // Wait for the pulse to start
  while (!!(PINB & _BV(pin)) != state)
  {
    if(numloops++ == maxloops) {return 0;}
    asm("nop \n");  
    asm("nop \n");
    asm("nop \n");
  }
  // Wait for the pulse to stop This loop is 16 instructions long
  while (!!(PINB & _BV(pin)) == state)
  {
    if(numloops++ == maxloops) {return 0;}           
    width++;
    asm("nop \n");  
    asm("nop \n");  
    asm("nop \n"); 
  }

  // Convert the reading to microseconds. 
  return clockCyclesToMicroseconds(width << 4); // Same as multiplying by 16
}

I include that function in my code and refer to pulseInx instead of pulseIn. Very dirty solution and I am sure there are better but that got the job done for me so I called it a day.

Also make sure that CPU your frequency is set properly and matches F_CPU define.