cycle_counter.h File Reference

AVR functions for busy-wait delay loops.

Copyright (c) 2011-2018 Microchip Technology Inc. and its subsidiaries.

#include <compiler.h>

Convenience functions for busy-wait delay loops
#define	delay_cycles   __portable_avr_delay_cycles
	Delay program execution for a specified number of CPU cycles. More...
#define	cpu_ms_2_cy(ms, f_cpu)   (((uint64_t)(ms) * (f_cpu) / 6 + 999) / 1e3)
	Convert milli-seconds into CPU cycles. More...
#define	cpu_us_2_cy(us, f_cpu)   (((uint64_t)(us) * (f_cpu) / 6 + 999999ul) / 1e6)
	Convert micro-seconds into CPU cycles. More...
#define	cpu_delay_ms(delay, f_cpu)   delay_cycles((uint64_t)cpu_ms_2_cy(delay, f_cpu))
	Delay program execution for a specified number of milliseconds. More...
#define	cpu_delay_us(delay, f_cpu)   delay_cycles((uint64_t)cpu_us_2_cy(delay, f_cpu))
	Delay program execution for a specified number of microseconds. More...
static __always_optimize void	__portable_avr_delay_cycles (unsigned long n)

#define cpu_delay_ms	(		delay,
			f_cpu
	)		delay_cycles((uint64_t)cpu_ms_2_cy(delay, f_cpu))

Delay program execution for a specified number of milliseconds.

Parameters

delay	number of milliseconds to wait
f_cpu	CPU frequency in Hertz

#define cpu_delay_us	(		delay,
			f_cpu
	)		delay_cycles((uint64_t)cpu_us_2_cy(delay, f_cpu))

Delay program execution for a specified number of microseconds.

Parameters

delay	number of microseconds to wait
f_cpu	CPU frequency in Hertz

#define cpu_ms_2_cy	(		ms,
			f_cpu
	)		(((uint64_t)(ms) * (f_cpu) / 6 + 999) / 1e3)

Convert milli-seconds into CPU cycles.

Parameters

ms	number of milliseconds
f_cpu	CPU frequency in Hertz

Returns

the converted number of CPU cycles

#define cpu_us_2_cy	(		us,
			f_cpu
	)		(((uint64_t)(us) * (f_cpu) / 6 + 999999ul) / 1e6)

Convert micro-seconds into CPU cycles.

Parameters

ms	number of microseconds
f_cpu	CPU frequency in Hertz

Returns

the converted number of CPU cycles

#define delay_cycles   __portable_avr_delay_cycles

Delay program execution for a specified number of CPU cycles.

Parameters

n	number of CPU cycles to wait

static __always_optimize void __portable_avr_delay_cycles ( unsigned long  n )

inlinestatic

References barrier.