owner-nrf52sdk/nRF5_SDK_15.3.0/components/libraries/bootloader/nrf_bootloader_dfu_timers.h

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 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
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 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
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/**@file
 *
 * @defgroup nrf_bootloader_dfu_timers Timers for DFU in the bootloader
 * @{
 * @ingroup  nrf_bootloader
 */

#ifndef NRF_BOOTLOADER_DFU_TIMERS_H__
#define NRF_BOOTLOADER_DFU_TIMERS_H__

#include <stdint.h>

#ifdef __cplusplus
extern "C"
{
#endif

#define NRF_BOOTLOADER_MIN_TIMEOUT_TICKS (150) //!< The shortest timeout allowed. To avoid the timeout not being activated before the time has passed.

/**@brief Macro for converting milliseconds to timer ticks.
 *
 * @param[in]  ms  The milliseconds to convert.
 *
 * @return  @p ms converted to ticks.
 */
#define NRF_BOOTLOADER_MS_TO_TICKS(ms) ((((uint64_t)(ms) * 32768)) / 1000)

/**@brief Handler called on timeout of a timer requested by the watchdog.
 */
typedef void (*nrf_bootloader_dfu_timeout_callback_t)(void);


/**@brief Function for restarting the inactivity timer.
 *
 * @note Calling this function cancels any previous calls to this function.
 *
 * @param[in]  timeout_ticks  The number of ticks until reset. There are 32768 ticks per second.
 *                            If 0 is passed, the timer will be stopped and not restarted.
 * @param[in]  callback       Function to be called on timeout.
 */
void nrf_bootloader_dfu_inactivity_timer_restart(uint32_t                              timeout_ticks,
                                                 nrf_bootloader_dfu_timeout_callback_t callback);


/**@brief Function for initializing and starting a repeated timer for feeding the watchdog.
 *
 * @param[in] timeout_ticks  The number of ticks between each feeding of the watchdog. There are
 *                           32768 ticks per second.
 * @param[in] callback       Function called on every timeout.
 */
void nrf_bootloader_wdt_feed_timer_start(uint32_t                              timeout_ticks,
                                         nrf_bootloader_dfu_timeout_callback_t callback);


/**@brief Function for retrieving the number of ticks since the RTC was started.
 *
 * There are 32768 ticks per second. This value does not wrap, even when the RTC counter wraps.
 *
 * @note  The value can be 2^24 ticks too small if sampled immediately after the RTC counter wraps,
 *        but before the internal loop counter has been incremented.
 *
 * @return The number of ticks since the RTC was started.
 */
uint32_t nrf_bootloader_dfu_timer_counter_get(void);

#ifdef __cplusplus
}
#endif

#endif // NRF_BOOTLOADER_DFU_TIMERS_H__

/** @} */