main copy.c

旋转16个LED灯控制程序

    
    spieeprom_read(tChar,fleds,2);		// the top 2 bytes
    spieeprom_read(bChar,fleds+2,2);	// and the bottom 2
    
    #ifdef SMOOTHSCROLL

      spieeprom_read(sChar,fleds+4,2);	// and the scroll characters

    #endif

	// However, we do have a fancy trick of our own.  If we are
	// smooth scrolling, then we clock out an extra line_shift
	// BITS, thus implementing the smooth scrolling
	
    #ifdef SMOOTHSCROLL

	  clock_scroll(line_shift);			// send 0-15 extra bits..
	
    #else

      clock_scroll(0);					// just send the 4 bytes
    
    #endif

  }

  // *** PORTB &= ~0x2;
  
}

// Interrupt 0 executes when the button is pressed.

// QUESTION: unlike the pixel output interrupt, this one
// doesn't sei().  Why?

SIGNAL (SIG_INT0) {
  
  // Wait until button no longer pressed
  
  while (! (BUTTON_PIN & _BV(BUTTON))) {
  }
  
  if (sensor_timer.bytes.high_byte == 0xFF) {
    
    // so in this instance, we set the watchdog to reset us
    
    sensor_timer.bytes.high_byte = 0x00;
      
    // Re-enable the watchdog timer, then loop until
    // it fires off.
      
    WDTCSR = _BV(WDE);
    for (;;);
      
  } else {
      
    // We want to shut everything down.  Setting sensor_timer
    // to the pin value will cause both the communications
    // loop and the regular timeout loop in the main() to
    // give up, which results in the device going to sleep.
      
    sensor_timer.bytes.high_byte = 0xFF;
      
  }

}

// Interrupt 1 executes when the hall effect sensor fires

// QUESTION: unlike the pixel output interrupt, this one
// doesn't sei().  Why?

SIGNAL (SIG_INT1) {
  
  #if NUM_LINES > 0

    uint8_t cLine;		// temp var used in scroll code
 
  #endif
  
  #ifdef DYNAMIC
  
  	uint8_t dCode;		// temp var mostly used in dynamic code
  	
  #else					// also needed in this case
  
    #if NUM_LINES > 0
    
      uint8_t dCode;
      
    #endif
    
  #endif

  // make sure we don't get bitten by the watchdog
  
  asm("wdr");

  // *** PORTB |= 0x8;

  // The first issue we need to deal with when the hall-effect
  // sensor tells us it sees the magnet is to avoid doing any
  // processing if we get an interrupt too soon after the previous
  // interrupt.
  
  // hall_debounce is incremented by TIMER0, which fires every 3ms
  // or so.  At the current setting of 4, this means that at least
  // 15ms must elapse per trigger, which translates to about 4000
  // rpm.
  
  if (hall_debounce > HALL_DEBOUNCE_THRESH) {


  // We know the number of ms since the last hall sensor trigger
  // and there are 128 radial 'pixels' per sweep so divide to get
  // the necessary ms between the pixel interrupts
    
  // QUESTION: 128 or 256?
    
  // Then we just make TIMER1 trigger at that rate!
    
  // Reset the Timer Count Register for TIMER1 to 0, so it will
  // begin counting up.
    
  TCNT1 = 0;
    
  // sensor_timer contains the number of TIMER0 interrupts since
  // the last time we updated TIMER1.  If it has a reasonable
  // value, then we use it to reset the TIMER1 clock.
    
  // if ((sensor_timer.bytes.low_byte < 0xFF) && (sensor_timer.bytes.low_byte > 0x03)) {
  if ((sensor_timer.bytes.high_byte == 0x00) || (sensor_timer.bytes.low_byte > 0x03)) {
    
    // TIMER1 works differently from TIMER0.  It's a 16-bit timer
    // that apparently increments at the system clock rate.
    //
    // Because TIMER0 increments at 1/256 of the clock rate, and
    // fires the interrupt only when it overflows, sensor_timer
    // is incremented once ever 256*256 cycles.
    //
    // We want TIMER1 to fire off 256 times around the loop, so
    // we can display 256 lines of pixels.  We do this by putting
    // sensor_timer into the high byte of TIMER1's comparator
    // value, and the residual of TIMER0 (what it's counted up
    // to since the last time sensor_timer was incremented) into
    // the low byte, effectively a fractional value!
    //
    // Since TIMER0 is incrementing at 1/256 of the rate of TIMER1,
    // this results in TIMER1 firing off 256 times per rotation,
    // with excellent time resolution.
    //
    // I was quite touched by the elegance of how this works out;
    // it may be able to handle the extreme RPMs of BrightSaber
    // without modification...
      
    // Set the TIMER1 comparator value.  As a hack to Limor's hack,
    // reduce the timing a little bit so that the display doesn't
    // span the full 360 degrees, thus giving us a little more time
    // around hall-effect interrupt time to do things.  An attempt
    // to get more speed, it doesn't seem to help - so back to the
    // old way of doing things.
    
    // OCR1A = ((sensor_timer << 8) | TCNT0) - (sensor_timer);
    
    // OCR1A = ((sensor_timer << 8) | TCNT0);
    
    OCR1AH = sensor_timer.bytes.low_byte;
    OCR1AL = TCNT0;
    
    // Clear the residual of TIMER0
      
    TCNT0 = 0;

	// If we are in dynamic mode and want the rev counter, increment the rev counter
	
	#ifdef DYNAMIC_REVCOUNT
	
	  // Increment the 4 byte rev counter - stored in reverse
	  // byte order
		
	  dynamicREV[0]++;
	  dCode = 0;
	  
	  while (dynamicREV[dCode] > '9') {
		dynamicREV[dCode] = '0';
		if (dCode != 3) {
		  dynamicREV[++dCode]++;			// Dont'cha just love compressed C syntax...?
		}
      }
		
	#endif
	
	// if we have only 2 lines, then we never scroll
	// otherwise, we have to move between the lines.
	// The code for no scrolling is NUM_LINES = 0
	
    #if NUM_LINES > 0

      // Check the line timer; if it has reached a particular value
      // then increment line_shift.  When that reaches 16, wrap it
      // and increment cur_line.  This system lets us be a little
      // more flexible in our timing system, and permits long delays
      // in the scrolling.
    
      if (line_timer >= SCROLLSPEED) {
    
        line_timer = line_timer - SCROLLSPEED;	// reset in a safe way that retains any residual
        line_shift = (line_shift + 1) & 0x0f;	// increment line_shift
      
        if (line_shift == 0x00) {

	      // Move down 1 line in the line list, wrapping around
	  	  // Made the mistake of using % which isn't a good thing
	  	  // on a chip without mult/div...
	  	  
	      cur_line++;
	      
	      if (cur_line == NUM_LINES) {
	        cur_line = 0;
	      }
	  
	      // Move the new first line into topLine.  Index through the
	      // lineOffsets array
	      
	      dCode = pgm_read_byte(lineOffsets+cur_line);
	  
	      memcpy_P(topLine,lines+dCode,16);
	      
	      // If we are doing dynamic data, set it if there
	      // is such data in the line.
	      
	      #ifdef DYNAMIC
	      
	        dynamicType = 0x00;					// assume no dynamic data will be shown
	        
	        dCode = pgm_read_byte(dInfo+cur_line);
	        
	        if (dCode != 0) {
	          dynamicPtr = topLine + (dCode & 0x0F);
	          dynamicType = dCode;
	        }
	        
	      #endif
	  
	      // Get the second line, which may wrap, but since we have
	      // extra entries in lineOffsets, this is not a problem!
	  
	      cLine = cur_line + 1;
	      
	      dCode = pgm_read_byte(lineOffsets+cLine);

	      memcpy_P(botLine,lines+dCode,16);
		  
	      // If we are doing dynamic data, set it if there
	      // is such data in the line.
	      
	      #ifdef DYNAMIC
	      
	        dCode = pgm_read_byte(dInfo+cLine);
	        
	        if (dCode != 0) {
	          dynamicPtr = botLine + (dCode & 0x0F);
	          dynamicType = dCode;
	        }
	        
	      #endif
	  
		  #ifdef SMOOTHSCROLL

	        // get the third line, which may wrap..
	  
	        cLine++;
	      
	        dCode = pgm_read_byte(lineOffsets+cLine);

	        memcpy_P(scrollLine,lines+dCode,16);
	    	
	        // If we are doing dynamic data, set it if there
	        // is such data in the line.
	      
	        #ifdef DYNAMIC
	      
	          dCode = pgm_read_byte(dInfo+cLine);
	        
	          if (dCode != 0) {
	            dynamicPtr = scrollLine + (dCode & 0x0F);
	            dynamicType = dCode;
	       	  }
	        
	        #endif
	  
		  #endif
		
        }
    
      }

    #else

      // we could do this just once when the app initializes, but
      // for now, let's do it here.  Later we'll move it.
    
      // Note that when there are only two lines, there is no
      // need for the lineOffset array, and it is not used.
      
	  cur_line = line_shift = 0;

	  memcpy_P(topLine,lines,16);
	  memcpy_P(botLine,lines+16,16);
	
	  #ifdef DYNAMIC
	      
	    dCode = pgm_read_byte(dInfo);
	        
	    if (dCode != 0) {
	       dynamicPtr = topLine + (dCode & 0x0F);
	       dynamicType = dCode;
	    }
	        
	    dCode = pgm_read_byte(dInfo+1);
	        
	    if (dCode != 0) {
	       dynamicPtr = botLine + (dCode & 0x0F);
	       dynamicType = dCode;
	    }
	        
	  #endif
	
    #endif

    // Set the character and pixel numbers so they will overflow
    // on the next pixel interrupt, and cause the correct data to
    // be loaded.
    
    // If we are not doing halfshifts, this is simple.
    
    #ifndef HALFSHIFT
    
      charNum = 31;		// will wrap to 0, the first char.  Not set to 15 as you might
    					// expect, because when it hits 15 again, the pixel output
    					// routine will shut down.  But (31+1) mod 16 = (15+1) mod 16...
      pixelNum = 15;		// will wrap to 0, the first pixel
    
    #else
    
      // If doing half-shifts, we need to check the first byte of each buffer
      // and adjust things if it says to do a half-shift
      
      // if not shifted
      
      if ((topLine[0] & 0x80) == 0x00) {
      
        charNum = 31;
        pixelNum = 15;
        
      } else {
      
        charNum = 0;		// shifted, so start in middle of first char
        pixelNum = 7;
        topLine[0] &= 0x7F;	// and clear hi bit!
        
      }
      
      // repeat for bottom line
      
      if ((botLine[0] & 0x80) == 0x00) {
      
        charNum2 = 31;
        pixelNum2 = 15;
        
      } else {
      
        charNum2 = 0;
        pixelNum2 = 7;
        botLine[0] &= 0x7F;
        
      }
      
      // and for scroll buffer
      
      #ifdef SMOOTHSCROLL
      
        if ((scrollLine[0] & 0x80) == 0x00) {
      
          charNum3 = 31;
          pixelNum3 = 15;
        
        } else {
      
          charNum3 = 0;
          pixelNum3 = 7;
          scrollLine[0] &= 0x7F;
        
        }

      #endif
      
    #endif
    
    // Start TIMER1 on its merry way...
      
    TCCR1B |= _BV(CS10);		// increment at clock/1
    TIMSK |= _BV(OCIE1A);		// enable interrupt when it matches OCR1A
    
  } else {
    
    // Since we don't have a valid setting for the rotation