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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.
*/
/**
* @defgroup drivers_periph_rtt RTT
* @ingroup drivers_periph
* @brief Low-level RTT (Real Time Timer) peripheral driver
*
* @{
* @file
* @brief Low-level RTT (Real Time Timer) peripheral driver interface
* definitions
*
* @author Thomas Eichinger <thomas.eichinger@fu-berlin.de>
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*/
#ifndef RTT_H
#define RTT_H
#include "periph_conf.h"
#ifdef __cplusplus
extern "C" {
#endif
/* guard file in case no RTT device was specified */
#if RTT_NUMOF
#ifndef RTT_FREQUENCY
#warning "RTT_FREQUENCY undefined. Set RTT_FREQUENCY to the number of ticks" \
"per second for the current architecture."
#endif
/**
* @brief Convert microseconds to rtt ticks
* @param[in] us number of microseconds
* @return rtt ticks
*/
#define RTT_US_TO_TICKS(us) ((uint32_t)((uint64_t)(us) * RTT_FREQUENCY / 1000000UL))
/**
* @brief Convert milliseconds to rtt ticks
* @param[in] ms number of milliseconds
* @return rtt ticks
*/
#define RTT_MS_TO_TICKS(ms) ( RTT_US_TO_TICKS((ms) * 1000) )
/**
* @brief Convert seconds to rtt ticks
* @param[in] sec number of seconds
* @return rtt ticks
*/
#define RTT_SEC_TO_TICKS(sec) ( RTT_MS_TO_TICKS((sec) * 1000) )
/**
* @brief Convert minutes to rtt ticks
* @param[in] min number of minutes
* @return rtt ticks
*/
#define RTT_MIN_TO_TICKS(min) ( RTT_SEC_TO_TICKS((min) * 60) )
/**
* @brief Convert rtt ticks to microseconds
* @param[in] ticks rtt ticks
* @return number of microseconds
*/
#define RTT_TICKS_TO_US(ticks) ((uint32_t)((uint64_t)(ticks) * 1000000UL / RTT_FREQUENCY))
/**
* @brief Convert rtt ticks to milliseconds
* @param[in] ticks rtt ticks
* @return number of milliseconds
*/
#define RTT_TICKS_TO_MS(ticks) (RTT_TICKS_TO_US(ticks) / 1000)
/**
* @brief Convert rtt ticks to seconds
* @param[in] ticks rtt ticks
* @return number of seconds
*/
#define RTT_TICKS_TO_SEC(ticks) (RTT_TICKS_TO_MS(ticks) / 1000)
/**
* @brief Convert rtt ticks to minutes
* @param[in] ticks rtt ticks
* @return number of minutes
*/
#define RTT_TICKS_TO_MIN(ticks) (RTT_TICKS_TO_SEC(ticks) / 60)
/**
* @brief Signature for the alarm callback
*
* @param[in] arg Optional argument which is passed to the
* callback
*/
typedef void(*rtt_cb_t)(void *arg);
/**
* @brief Initialize RTT module
*/
void rtt_init(void);
/**
* @brief Set a callback for the counter overflow event
*
* @param[in] cb Callback to execute on overflow
* @param[in] arg Argument passed to the callback
*/
void rtt_set_overflow_cb(rtt_cb_t cb, void *arg);
/**
* @brief Clear the overflow callback
*/
void rtt_clear_overflow_cb(void);
/**
* @brief Get the current RTT counter.
*
* @return Current value of the RTT counter
*/
uint32_t rtt_get_counter(void);
/**
* @brief Set the RTT counter to a specified value.
*
* @param[in] counter The value to set the RTT to.
*/
void rtt_set_counter(uint32_t counter);
/**
* @brief Set an alarm for RTT to the specified value.
*
* @param[in] alarm The value to trigger an alarm when hit
* @param[in] cb Callback executed when alarm is hit
* @param[in] arg Argument passed to callback when alarm is hit
*/
void rtt_set_alarm(uint32_t alarm, rtt_cb_t cb, void *arg);
/**
* @brief Get the value of a set alarm.
*
* If no alarm is set, the return value is arbitrary.
*
* @return Value the alarm is set to
*/
uint32_t rtt_get_alarm(void);
/**
* @brief Clear any set alarm, do nothing if nothing set
*/
void rtt_clear_alarm(void);
/**
* @brief Turn the RTT hardware module on
*/
void rtt_poweron(void);
/**
* @brief Turn the RTT hardware module off
*/
void rtt_poweroff(void);
#endif /* RTT_NUMOF */
#ifdef __cplusplus
}
#endif
#endif /* RTT_H */
/** @} */
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