rtt.h

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/*
 * Copyright (C) 2014 Thomas Eichinger <thomas.eichinger@fu-berlin.de>
 *
 * This file is subject to the terms and conditions of the GNU Lesser General
 * Public License v2.1. See the file LICENSE in the top level directory for more
 * details.
 */
 
#ifndef PERIPH_RTT_H
#define PERIPH_RTT_H
 
#include <stdint.h>
 
#include "periph_conf.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifdef DOXYGEN
#define RTT_FREQUENCY
#endif
 
#ifdef DOXYGEN
#define RTT_MAX_VALUE
#endif
 
#ifndef RTT_MIN_OFFSET
#define RTT_MIN_OFFSET (2U)
#endif
 
/* Allow mock-RTT for unit tests */
#ifdef MOCK_RTT_FREQUENCY
#undef RTT_FREQUENCY
#define RTT_FREQUENCY MOCK_RTT_FREQUENCY
#else
#ifndef RTT_FREQUENCY
#warning "RTT_FREQUENCY undefined. Set RTT_FREQUENCY to the number of ticks " \
         "per second for the current architecture."
#endif
#endif
 
/* Allow mock-RTT for unit tests */
#ifdef MOCK_RTT_MAX_VALUE
#undef RTT_MAX_VALUE
#define RTT_MAX_VALUE MOCK_RTT_MAX_VALUE
#else
#ifndef RTT_MAX_VALUE
#warning "RTT_MAX_VALUE is undefined. Set RTT_MAX_VALUE to the maximum value " \
         "for the RTT counter, ensure it is (2^n - 1)."
#endif
#endif
 
#define RTT_US_TO_TICKS(us)     (RTT_SEC_TO_TICKS(us) / 1000000UL)
 
#define RTT_MS_TO_TICKS(ms)     (RTT_SEC_TO_TICKS(ms) / 1000UL)
 
#define RTT_SEC_TO_TICKS(sec)   (sec * RTT_FREQUENCY)
 
#define RTT_MIN_TO_TICKS(min)   (RTT_SEC_TO_TICKS((min) * 60))
 
#define RTT_TICKS_TO_US(ticks)  ((uint64_t)(ticks) * 1000000UL / RTT_FREQUENCY)
 
#define RTT_TICKS_TO_MS(ticks)  (RTT_TICKS_TO_US(ticks) / 1000)
 
#define RTT_TICKS_TO_SEC(ticks)  (RTT_TICKS_TO_MS(ticks) / 1000)
 
#define RTT_TICKS_TO_MIN(ticks)  (RTT_TICKS_TO_SEC(ticks) / 60)
 
typedef void(*rtt_cb_t)(void *arg);
 
void rtt_init(void);
 
void rtt_set_overflow_cb(rtt_cb_t cb, void *arg);
 
void rtt_clear_overflow_cb(void);
 
uint32_t rtt_get_counter(void);
 
void rtt_set_counter(uint32_t counter);
 
void rtt_set_alarm(uint32_t alarm, rtt_cb_t cb, void *arg);
 
uint32_t rtt_get_alarm(void);
 
void rtt_clear_alarm(void);
 
void rtt_poweron(void);
 
void rtt_poweroff(void);
 
#ifdef __cplusplus
}
#endif
 
#endif /* PERIPH_RTT_H */