TOC
nRF SDK16 timer
头文件
声明timer变量
APP_TIMER_DEF(closeLockTimer);
timer回调函数
/**@brief Function for close the lock
*
* @details this is the timer callback function
* for a delay time to close the lock
*/
static void unlock_timeOutCallBack(void *arg)
{
UNUSED_PARAMETER(arg);
bsp_board_led_off(LEDBUTTON_LED);
}
创建timer
/**@brief Function for creating a timer instance.
*
* @param[in] p_timer_id Pointer to timer identifier.
* @param[in] mode Timer mode.
* @param[in] timeout_handler Function to be executed when the timer expires.
*
* @retval NRF_SUCCESS If the timer was successfully created.
* @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid.
* @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or
* the timer is running.
*
* @note This function does the timer allocation in the caller's context. It is also not protected
* by a critical region. Therefore care must be taken not to call it from several interrupt
* levels simultaneously.
* @note The function can be called again on the timer instance and will re-initialize the instance if
* the timer is not running.
* @attention The FreeRTOS and RTX app_timer implementation does not allow app_timer_create to
* be called on the previously initialized instance.
*/
ret_code_t app_timer_create(app_timer_id_t const * p_timer_id,
app_timer_mode_t mode,
app_timer_timeout_handler_t timeout_handler);
app_timer_create(&closeLockTimer, APP_TIMER_MODE_SINGLE_SHOT, unlock_timeOutCallBack);
启动timer
/**@brief Function for starting a timer.
*
* @param[in] timer_id Timer identifier.
* @param[in] timeout_ticks Number of ticks (of RTC1, including prescaling) to time-out event
* (minimum 5 ticks).
* @param[in] p_context General purpose pointer. Will be passed to the time-out handler when
* the timer expires.
*
* @retval NRF_SUCCESS If the timer was successfully started.
* @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid.
* @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or the timer
* has not been created.
* @retval NRF_ERROR_NO_MEM If the timer operations queue was full.
*
* @note The minimum timeout_ticks value is 5.
* @note For multiple active timers, time-outs occurring in close proximity to each other (in the
* range of 1 to 3 ticks) will have a positive jitter of maximum 3 ticks.
* @note When calling this method on a timer that is already running, the second start operation
* is ignored.
*/
ret_code_t app_timer_start(app_timer_id_t timer_id, uint32_t timeout_ticks, void * p_context);
define UNLOCK_PERIOD APP_TIMER_TICKS(5000)
app_timer_start(closeLockTimer, UNLOCK_PERIOD, NULL);
