Internal settings

These constants should not be modified by user.

Macros
#define	CLASSB_TC_COUNT_REF
	TC count reference. More...
#define	CLASSB_TC_FREQ   (uint32_t)(F_CPU / CLASSB_TC_PRESCALER)
	TC frequency. More...
#define	CLASSB_TC_MAX_DIFF
	Maximum absolute difference between reference and estimated frequency. More...
#define	CLASSB_TC_MAX_OVF_COUNT
	TC maximum number of overflows. More...
#define	CLASSB_TC_PER   0xFFFF
	TC period. More...
#define	CLASSB_TC_PRESCALER_gc   LABEL(TC_CLKSEL_DIV, CLASSB_TC_PRESCALER, _gc)
	Label for the TC prescaler group configuration. More...
#define	CLASSB_TEST_TC   LABEL(TC, CLASSB_TC_MOD,)
	Label for the TC module. More...
#define	CLASSB_TEST_TC_OVF_vect   LABEL(TC, CLASSB_TC_MOD, _OVF_vect)
	Label for the overflow interrupt vector for the chosen TC. More...

#define CLASSB_TC_COUNT_REF

Value:

(uint32_t)(((1e0L * CLASSB_TC_FREQ) \
        * CLASSB_RTC_INT_PERIOD) / CLASSB_RTC_FREQ)

TC count reference.

This is the reference value for TC count within one RTC interrupt period. Reference = F_tc * Interrupt_Period_rtc / F_rtc This can overflow if CLASSB_TC_FREQ and CLASSB_RTC_INT_PERIOD are too large.

Note

Multiplying by 1e0L forces the preprocessor to do operations with higher precision.

Referenced by classb_freq_callback().

#define CLASSB_TC_FREQ   (uint32_t)(F_CPU / CLASSB_TC_PRESCALER)

TC frequency.

The frequency of the TC is F_CPU divided by the prescaling factor.

#define CLASSB_TC_MAX_DIFF

Value:

(uint32_t)((1e0L * CLASSB_TC_COUNT_REF \
        * CLASSB_TC_TOLERANCE) / 100UL)

Maximum absolute difference between reference and estimated frequency.

Note

Multiplying by 1e0L forces the preprocessor to do operations with higher precision.

Referenced by classb_freq_callback().

#define CLASSB_TC_MAX_OVF_COUNT

Value:

(uint16_t)((CLASSB_TC_COUNT_REF \
        + CLASSB_TC_MAX_DIFF) >> 16)

TC maximum number of overflows.

This is a limit for the number of TC overflows. If this is exceeded, the RTC is assumed to be faulty and the error handler called.

Referenced by classb_freq_tc_callback().

#define CLASSB_TC_PER   0xFFFF

TC period.

The 16-bit TC will generate an interrupt when the count reaches this value. The code is built counting that this is the largest possible value, i.e., 0xFFFF.

Referenced by classb_freq_setup_timer().

#define CLASSB_TC_PRESCALER_gc   LABEL(TC_CLKSEL_DIV, CLASSB_TC_PRESCALER, _gc)

Label for the TC prescaler group configuration.

Referenced by classb_freq_setup_timer().

#define CLASSB_TEST_TC   LABEL(TC, CLASSB_TC_MOD,)

Label for the TC module.

Referenced by classb_freq_callback(), and classb_freq_setup_timer().

#define CLASSB_TEST_TC_OVF_vect   LABEL(TC, CLASSB_TC_MOD, _OVF_vect)

Label for the overflow interrupt vector for the chosen TC.