calib_values.h

Go to the documentation of this file.

/* This file has been prepared for Doxygen automatic documentation generation.*/
#ifndef __CALIB_VALUES_H__
#define __CALIB_VALUES_H__

//#define CALIBRATION_METHOD_BINARY_WITHOUT_NEIGHBOR
//#define CALIBRATION_METHOD_SIMPLE

#define CALIBRATION_FREQUENCY 1000000

#define XTAL_FREQUENCY 32768
#define EXTERNAL_TICKS 100               // ticks on XTAL. Modify to increase/decrease accuracy

#define FALSE 0
#define TRUE 1
#define RUNNING 0
#define FINISHED 1
#define DEFAULT_OSCCAL_MASK        0x00  // Lower half and
#define DEFAULT_OSCCAL_MASK_HIGH   0x80  // upper half for devices with splitted OSCCAL register

#include "device_specific.h"

#define DEFAULT_OSCCAL_HIGH ((1 << (OSCCAL_RESOLUTION - 1)) | DEFAULT_OSCCAL_MASK_HIGH)
#define INITIAL_STEP         (1 << (OSCCAL_RESOLUTION - 2))
#define DEFAULT_OSCCAL      ((1 << (OSCCAL_RESOLUTION - 1)) | DEFAULT_OSCCAL_MASK)

// **** Functions implemented as macros to avoid function calls
#define PREPARE_CALIBRATION() \
calStep = INITIAL_STEP; \
calibration = RUNNING;

#define COMPUTE_COUNT_VALUE() \
countVal = ((EXTERNAL_TICKS*CALIBRATION_FREQUENCY)/(XTAL_FREQUENCY*LOOP_CYCLES));

// Set up timer to be ASYNCHRONOUS from the CPU clock with a second EXTERNAL 32,768kHz CRYSTAL driving it. No prescaling on asynchronous timer.
#define SETUP_ASYNC_TIMER() \
ASSR |= (1<<ASYNC_TIMER); \
ASYNC_TIMER_CONTROL_REGISTER = (1<<NO_PRESCALING);




// For ATmega64 and ATmega128, 8 nop instructions must be run after a
// change in OSCCAL to ensure stability (See errata in datasheet).
// For all other devices, one nop instruction should be run to let
// the RC oscillator stabilize.
// The NOP() macro takes care of this.
#if defined(__AT90Mega64__) | defined(__ATmega64__) | \
    defined(__AT90Mega128__) | defined(__ATmega128__)

#define NOP() \
__no_operation(); \
__no_operation(); \
__no_operation(); \
__no_operation(); \
__no_operation(); \
__no_operation(); \
__no_operation(); \
__no_operation();


#else
#define NOP() __no_operation()
#endif

// Absolute value macro.
#define ABS(var) (((var) < 0) ? -(var) : (var));

#endif

---