Timer0 Aux

frequency and ticks
Timer ticks to frequency and vice versa convertions
#define	timer0_uint16_ticks_to_freq100(ticks)   (timer_uint16_ticks_to_freq100(ticks, get_timer0_clock_divider(), get_frequency_divider_scale()))
	Convert ticks to timer frequency for timer0 multiplied by 100. More...
#define	timer0_frequency_to_ticks_unsafe(frequency)   (timer_frequency_to_ticks_unsafe(frequency, get_timer0_clock_divider(), get_frequency_divider_scale()))
	Unsafe approximation timer0 frequency corresponding to ticks. More...
#define	timer0_ticks_to_ms_usafe(ticks)   (timer_ticks_to_ms_usafe(ticks, get_timer0_clock_divider(), get_frequency_divider_scale()))
	Convert ticks count to ms. More...
#define	timer0_ms_to_ticks_usafe(ms)   (timer_ms_to_ticks_usafe(ms, get_timer0_clock_divider()))
	Convert milliseconds to timer0 ticks. More...

tick to frequency conversions
Timer ticks to overlow frequency and vice versa convertions
#define	timer2_ticks_to_ms_usafe(ticks)   (timer_ticks_to_ms_usafe(ticks, get_timer2_clock_divider(), get_frequency_divider_scale()))
	Convert ticks count to ms. More...

UART baud rate to ticks
UART baud rate to timer ticks to overlow frequency and vice versa convertions
#define	timer2_ms_to_ticks_usafe(ms)   (timer_ms_to_ticks_usafe(ms, get_timer2_clock_divider()))
	Convert milliseconds to timer2 ticks. More...

Detailed Description

Functions and data structures for converting timer ticks to frequency and times for timer0.

Author

Michael Golovanov

Macro Definition Documentation

timer0_frequency_to_ticks_unsafe

#define timer0_frequency_to_ticks_unsafe

(

frequency

)

(timer_frequency_to_ticks_unsafe(frequency, get_timer0_clock_divider(), get_frequency_divider_scale()))

Unsafe approximation timer0 frequency corresponding to ticks.

ticks = get_master_clock_frequency() / (2 * get_timer0_clock_divider() * frequency))

Call this method after timer0 is initialized and MCU clock frequency divider scale is set.

This method doesnt analyze corner cases and overflow of result. Be careful.

Parameters

frequency

uint32_t frequency value in Hz. Should not be 0;

Returns

uint16_t timer0 ticks corresponding to frequency value

timer0_ms_to_ticks_usafe

#define timer0_ms_to_ticks_usafe

(

ms

)

(timer_ms_to_ticks_usafe(ms, get_timer0_clock_divider()))

Convert milliseconds to timer0 ticks.

1 ms = ((get_master_clock_frequency_high_part() + 26) >> get_frequency_divider_scale()) / timer_clock_divider

This routine doesnt check overflows. Its unsafe.

Parameters

ms	uint16_t ms to convert

Returns

uint16_t ticks count for milliseconds

timer0_ticks_to_ms_usafe

#define timer0_ticks_to_ms_usafe

(

ticks

)

(timer_ticks_to_ms_usafe(ticks, get_timer0_clock_divider(), get_frequency_divider_scale()))

Convert ticks count to ms.

This method doesnt analyze corner cases and overflow of result. Be careful.

Parameters

ticks

uint16_t ticks count

Returns

milliseconds time corresponing to timer ticks

timer0_uint16_ticks_to_freq100

#define timer0_uint16_ticks_to_freq100

(

ticks

)

(timer_uint16_ticks_to_freq100(ticks, get_timer0_clock_divider(), get_frequency_divider_scale()))

Convert ticks to timer frequency for timer0 multiplied by 100.

The output frequency = (SYSclk/timer_clock_divider)/((65536-ticks) * 2). Multiplication by 100 is used for get frequency value without using float numbers.

Call this method after timer0 is initialized and MCU clock frequency divider scale is set.

uint16 ticks used in mode 0, 1, 3. Low byte of ticks is used in mode 2.

Parameters

ticks

uint16_t timer ticks count to covert

Returns

uint32_t frequency multiplied by 100 corresponding to ticks count

timer2_ms_to_ticks_usafe

#define timer2_ms_to_ticks_usafe

(

ms

)

(timer_ms_to_ticks_usafe(ms, get_timer2_clock_divider()))

Convert milliseconds to timer2 ticks.

1 ms = ((get_master_clock_frequency_high_part() + 26) >> get_frequency_divider_scale()) / timer_clock_divider

This routine doesnt check overflows. Its unsafe.

Parameters

ms	uint16_t ms to convert

Returns

uint16_t ticks count for milliseconds

timer2_ticks_to_ms_usafe

#define timer2_ticks_to_ms_usafe

(

ticks

)

(timer_ticks_to_ms_usafe(ticks, get_timer2_clock_divider(), get_frequency_divider_scale()))

Convert ticks count to ms.

This method doesnt analyze corner cases and overflow of result. Be careful.

Parameters

ticks

uint16_t ticks count

Returns

milliseconds time corresponing to timer ticks