/**
* \file
*
* \brief ARM functions for busy-wait delay loops
*
* Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
*
* \asf_license_start
*
* \page License
*
* Subject to your compliance with these terms, you may use Microchip
* software and any derivatives exclusively with Microchip products.
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* to your use of third party software (including open source software) that
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*
* THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
* WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
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/*
* Support and FAQ: visit Microchip Support
*/
#ifndef CYCLE_COUNTER_H_INCLUDED
#define CYCLE_COUNTER_H_INCLUDED
#include
#include
#ifdef __cplusplus
extern "C" {
#endif
/**
* \name Convenience functions for busy-wait delay loops
*
* @{
*/
/**
* \brief Delay loop to delay n number of cycles
* Delay program execution for at least the specified number of CPU cycles.
*
* \param n Number of cycles to delay
*/
static inline void delay_cycles(
const uint32_t n)
{
if (n > 0) {
SysTick->LOAD = n;
SysTick->VAL = 0;
while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk)) {
};
}
}
void delay_cycles_us(uint32_t n);
void delay_cycles_ms(uint32_t n);
/**
* \brief Delay program execution for at least the specified number of microseconds.
*
* \param delay number of microseconds to wait
*/
#define cpu_delay_us(delay) delay_cycles_us(delay)
/**
* \brief Delay program execution for at least the specified number of milliseconds.
*
* \param delay number of milliseconds to wait
*/
#define cpu_delay_ms(delay) delay_cycles_ms(delay)
/**
* \brief Delay program execution for at least the specified number of seconds.
*
* \param delay number of seconds to wait
*/
#define cpu_delay_s(delay) delay_cycles_ms(1000 * delay)
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /* CYCLE_COUNTER_H_INCLUDED */