Ver 0.14

o Added compile option to place 601Hz signal on PD3 to use for timing calibration
o Deleted watchdog ISR.
o Minor cleanup

Arduino-microfox/Arduino-microfox.ino

@@ -214,7 +214,7 @@ void doSynchronization(void);
 
 /* Set compare match register for 1hz increments
  ************************************************************
- ** USE THIS TO FIX BOARD PROCESSOR CLOCK ERROR
+ ** USE THIS TO CALIBRATE FOR BOARD PROCESSOR CLOCK ERROR
  ************************************************************/
 	/* first testing found bad drift relative to a gps stable clock (iphone timer) is was 10 seconds in about 50 minutes
 	 * Today I measured the Arduino nano 16 Mhz clock and it was 16.050 MHz. Yes 50 Khz high!!
@@ -237,6 +237,9 @@ void doSynchronization(void);
 	TCCR2A = 0;
 	TCCR2B = 0;
 	TCCR2A |= (1 << WGM21);                             /* set Clear Timer on Compare Match (CTC) mode with OCR2A setting the top */
+#if CAL_SIGNAL_ON_PD3
+		TCCR2A |= (1 << COM2B0);                        /* Toggle OC2B (PD3) on compare match */
+#endif /* CAL_SIGNAL_ON_PD3 */
 	TCCR2B |= (1 << CS22) | (1 << CS21) | (1 << CS20);  /* 1024 Prescaler */
 	OCR2A = 0x0C;                                       /* set frequency to ~300 Hz (0x0c) */
 	/* Use system clock for Timer/Counter2 */
@@ -415,35 +418,6 @@ ISR(PCINT2_vect)
 }
 
 
-/***********************************************************************
- * Watchdog Timeout ISR
- *
- * The Watchdog timer helps prevent lockups due to hardware problems.
- * It is especially helpful in this application for preventing I2C bus
- * errors from locking up the foreground process.
- ************************************************************************/
-ISR(WDT_vect)
-{
-	static uint8_t limit = 10;
-
-/*	g_i2c_not_timed_out = FALSE;    / * unstick I2C * / */
-
-	/* Don't allow an unlimited number of WD interrupts to occur without enabling
-	 * hardware resets. But a limited number might be required during hardware
-	 * initialization. */
-/*	if(!g_enableHardwareWDResets && limit)
- *	{
- *		WDTCSR |= (1 << WDIE);  / * this prevents hardware resets from occurring * /
- *	} */
-
-	if(limit)
-	{
-		limit--;
-/*		g_last_error_code = ERROR_CODE_WD_TIMEOUT; */
-	}
-}
-
-
 /***********************************************************************
  * USART Rx Interrupt ISR
  *
@@ -683,6 +657,7 @@ ISR(USART_UDRE_vect)
 	}
 }   /* End of UART Tx ISR */
 
+
 /***********************************************************************
  * Timer/Counter2 Compare Match B ISR
  *

Arduino-microfox/defs.h

@@ -28,6 +28,7 @@
 
 // #define COMPILE_FOR_ATMELSTUDIO7
 #define HARDWARE_EXTERNAL_DIP_PULLUPS_INSTALLED FALSE
+#define CAL_SIGNAL_ON_PD3 FALSE
 
 #ifdef COMPILE_FOR_ATMELSTUDIO7
 	#include <avr/io.h>
@@ -61,7 +62,7 @@
 
 /******************************************************
  * Set the text that gets displayed to the user */
-#define SW_REVISION "0.13"
+#define SW_REVISION "0.14"
 
 //#define TRANQUILIZE_WATCHDOG
 

Arduino-microfox/linkbus.cpp

@@ -49,7 +49,6 @@ static const char textHelp[][23] = { "\nCommands:\n",
 									 "  RST - Reset\n",
 									 "  SPD - ID code speed\n",
 									 "  STA - Start tones\n",
-									 "  SYN - Sync on/off\n",
 									 "  TEM - Temperature\n",
 									 "  VER - S/W version\n" };