Nordic stack and drivers for the mbed BLE API
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Diff: TARGET_MCU_NRF51822/sdk/source/libraries/timer/app_timer.h
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- 638:c90ae1400bf2
diff -r f7faad332abc -r c90ae1400bf2 TARGET_MCU_NRF51822/sdk/source/libraries/timer/app_timer.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TARGET_MCU_NRF51822/sdk/source/libraries/timer/app_timer.h Wed Sep 14 14:39:43 2016 +0100 @@ -0,0 +1,297 @@ +/* + * Copyright (c) Nordic Semiconductor ASA + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, this + * list of conditions and the following disclaimer in the documentation and/or + * other materials provided with the distribution. + * + * 3. Neither the name of Nordic Semiconductor ASA nor the names of other + * contributors to this software may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +/** @file + * + * @defgroup app_timer Application Timer + * @{ + * @ingroup app_common + * + * @brief Application timer functionality. + * + * @details This module enables the application to create multiple timer instances based on the RTC1 + * peripheral. Checking for time-outs and invokation of user time-out handlers is performed + * in the RTC1 interrupt handler. List handling is done using a software interrupt (SWI0). + * Both interrupt handlers are running in APP_LOW priority level. + * + * @details When calling app_timer_start() or app_timer_stop(), the timer operation is just queued, + * and the software interrupt is triggered. The actual timer start/stop operation is + * executed by the SWI0 interrupt handler. Since the SWI0 interrupt is running in APP_LOW, + * if the application code calling the timer function is running in APP_LOW or APP_HIGH, + * the timer operation will not be performed until the application handler has returned. + * This will be the case, for example, when stopping a timer from a time-out handler when not using + * the scheduler. + * + * @details Use the USE_SCHEDULER parameter of the APP_TIMER_INIT() macro to select if the + * @ref app_scheduler should be used or not. Even if the scheduler is + * not used, app_timer.h will include app_scheduler.h, so when + * compiling, app_scheduler.h must be available in one of the compiler include paths. + */ + +#ifndef APP_TIMER_H__ +#define APP_TIMER_H__ + +#include <stdint.h> +#include <stdbool.h> +#include <stdio.h> +#include "app_error.h" +#include "app_util.h" +#include "compiler_abstraction.h" + +#define APP_TIMER_CLOCK_FREQ 32768 /**< Clock frequency of the RTC timer used to implement the app timer module. */ +#define APP_TIMER_MIN_TIMEOUT_TICKS 5 /**< Minimum value of the timeout_ticks parameter of app_timer_start(). */ + +#define APP_TIMER_NODE_SIZE 32 /**< Size of app_timer.timer_node_t (used to allocate data). */ +#define APP_TIMER_USER_OP_SIZE 24 /**< Size of app_timer.timer_user_op_t (only for use inside APP_TIMER_BUF_SIZE()). */ +#define APP_TIMER_USER_SIZE 8 /**< Size of app_timer.timer_user_t (only for use inside APP_TIMER_BUF_SIZE()). */ +#define APP_TIMER_INT_LEVELS 3 /**< Number of interrupt levels from where timer operations may be initiated (only for use inside APP_TIMER_BUF_SIZE()). */ + +/**@brief Compute number of bytes required to hold the application timer data structures. + * + * @param[in] OP_QUEUE_SIZE Size of queues holding timer operations that are pending execution. + * Note that due to the queue implementation, this size must be one more + * than the size that is actually needed. + * + * @return Required application timer buffer size (in bytes). + */ +#define APP_TIMER_BUF_SIZE(OP_QUEUE_SIZE) \ + ( \ + ( \ + APP_TIMER_INT_LEVELS \ + * \ + (APP_TIMER_USER_SIZE + ((OP_QUEUE_SIZE) + 1) * APP_TIMER_USER_OP_SIZE) \ + ) \ + ) + +/**@brief Convert milliseconds to timer ticks. + * + * This macro uses 64-bit integer arithmetic, but as long as the macro parameters are + * constants (i.e. defines), the computation will be done by the preprocessor. + * + * When using this macro, ensure that the + * values provided as input result in an output value that is supported by the + * @ref app_timer_start function. For example, when the ticks for 1 ms is needed, the + * maximum possible value of PRESCALER must be 6, when @ref APP_TIMER_CLOCK_FREQ is 32768. + * This will result in a ticks value as 5. Any higher value for PRESCALER will result in a + * ticks value that is not supported by this module. + * + * @param[in] MS Milliseconds. + * @param[in] PRESCALER Value of the RTC1 PRESCALER register (must be the same value that was + * passed to APP_TIMER_INIT()). + * + * @return Number of timer ticks. + */ +#define APP_TIMER_TICKS(MS, PRESCALER)\ + ((uint32_t)ROUNDED_DIV((MS) * (uint64_t)APP_TIMER_CLOCK_FREQ, ((PRESCALER) + 1) * 1000)) + +typedef struct app_timer_t { uint32_t data[CEIL_DIV(APP_TIMER_NODE_SIZE, sizeof(uint32_t))]; } app_timer_t; + +/**@brief Timer ID type. + * Never declare a variable of this type, but use the macro @ref APP_TIMER_DEF instead.*/ +typedef app_timer_t * app_timer_id_t; + +/** + * @brief Create a timer identifier and statically allocate memory for the timer. + * + * @param timer_id Name of the timer identifier variable that will be used to control the timer. + */ +#define APP_TIMER_DEF(timer_id) \ + static app_timer_t timer_id##_data = { {0} }; \ + static const app_timer_id_t timer_id = &timer_id##_data + + +/**@brief Application time-out handler type. */ +typedef void (*app_timer_timeout_handler_t)(void * p_context); + +/**@brief Type of function for passing events from the timer module to the scheduler. */ +typedef uint32_t (*app_timer_evt_schedule_func_t) (app_timer_timeout_handler_t timeout_handler, + void * p_context); + +/**@brief Timer modes. */ +typedef enum +{ + APP_TIMER_MODE_SINGLE_SHOT, /**< The timer will expire only once. */ + APP_TIMER_MODE_REPEATED /**< The timer will restart each time it expires. */ +} app_timer_mode_t; + +/**@brief Initialize the application timer module. + * + * @details This macro handles dimensioning and allocation of the memory buffer required by the timer, + * making sure that the buffer is correctly aligned. It will also connect the timer module + * to the scheduler (if specified). + * + * @note This module assumes that the LFCLK is already running. If it is not, the module will + * be non-functional, since the RTC will not run. If you do not use a SoftDevice, you + * must start the LFCLK manually. See the rtc_example's lfclk_config() function + * for an example of how to do this. If you use a SoftDevice, the LFCLK is started on + * SoftDevice init. + * + * + * @param[in] PRESCALER Value of the RTC1 PRESCALER register. This will decide the + * timer tick rate. Set to 0 for no prescaling. + * @param[in] OP_QUEUES_SIZE Size of queues holding timer operations that are pending execution. + * @param[in] SCHEDULER_FUNC Pointer to scheduler event handler + * + * @note Since this macro allocates a buffer, it must only be called once (it is OK to call it + * several times as long as it is from the same location, for example, to do a re-initialization). + */ +/*lint -emacro(506, APP_TIMER_INIT) */ /* Suppress "Constant value Boolean */ +#define APP_TIMER_INIT(PRESCALER, OP_QUEUES_SIZE, SCHEDULER_FUNC) \ + do \ + { \ + static uint32_t APP_TIMER_BUF[CEIL_DIV(APP_TIMER_BUF_SIZE((OP_QUEUES_SIZE) + 1), \ + sizeof(uint32_t))]; \ + uint32_t ERR_CODE = app_timer_init((PRESCALER), \ + (OP_QUEUES_SIZE) + 1, \ + APP_TIMER_BUF, \ + SCHEDULER_FUNC); \ + APP_ERROR_CHECK(ERR_CODE); \ + } while (0) + + + +/**@brief Function for initializing the timer module. + * + * Normally, initialization should be done using the APP_TIMER_INIT() macro, because that macro will both + * allocate the buffers needed by the timer module (including aligning the buffers correctly) + * and take care of connecting the timer module to the scheduler (if specified). + * + * @param[in] prescaler Value of the RTC1 PRESCALER register. Set to 0 for no prescaling. + * @param[in] op_queues_size Size of queues holding timer operations that are pending + * execution. Note that due to the queue implementation, this size must + * be one more than the size that is actually needed. + * @param[in] p_buffer Pointer to memory buffer for internal use in the app_timer + * module. The size of the buffer can be computed using the + * APP_TIMER_BUF_SIZE() macro. The buffer must be aligned to a + * 4 byte boundary. + * @param[in] evt_schedule_func Function for passing time-out events to the scheduler. Point to + * app_timer_evt_schedule() to connect to the scheduler. Set to NULL + * to make the timer module call the time-out handler directly from + * the timer interrupt handler. + * + * @retval NRF_SUCCESS If the module was initialized successfully. + * @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid (buffer not aligned to a 4 byte + * boundary or NULL). + */ +uint32_t app_timer_init(uint32_t prescaler, + uint8_t op_queues_size, + void * p_buffer, + app_timer_evt_schedule_func_t evt_schedule_func); + +/**@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. + */ +uint32_t app_timer_create(app_timer_id_t const * p_timer_id, + app_timer_mode_t mode, + app_timer_timeout_handler_t timeout_handler); + +/**@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. + */ +uint32_t app_timer_start(app_timer_id_t timer_id, uint32_t timeout_ticks, void * p_context); + +/**@brief Function for stopping the specified timer. + * + * @param[in] timer_id Timer identifier. + * + * @retval NRF_SUCCESS If the timer was successfully stopped. + * @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. + */ +uint32_t app_timer_stop(app_timer_id_t timer_id); + +/**@brief Function for stopping all running timers. + * + * @retval NRF_SUCCESS If all timers were successfully stopped. + * @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized. + * @retval NRF_ERROR_NO_MEM If the timer operations queue was full. + */ +uint32_t app_timer_stop_all(void); + +/**@brief Function for returning the current value of the RTC1 counter. + * + * @param[out] p_ticks Current value of the RTC1 counter. + * + * @retval NRF_SUCCESS If the counter was successfully read. + */ +uint32_t app_timer_cnt_get(uint32_t * p_ticks); + +/**@brief Function for computing the difference between two RTC1 counter values. + * + * @param[in] ticks_to Value returned by app_timer_cnt_get(). + * @param[in] ticks_from Value returned by app_timer_cnt_get(). + * @param[out] p_ticks_diff Number of ticks from ticks_from to ticks_to. + * + * @retval NRF_SUCCESS If the counter difference was successfully computed. + */ +uint32_t app_timer_cnt_diff_compute(uint32_t ticks_to, + uint32_t ticks_from, + uint32_t * p_ticks_diff); + +#endif // APP_TIMER_H__ + +/** @} */