diff options
Diffstat (limited to 'atmel-samd/asf4/samd51/hal/src/hal_timer.c')
| -rw-r--r-- | atmel-samd/asf4/samd51/hal/src/hal_timer.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/atmel-samd/asf4/samd51/hal/src/hal_timer.c b/atmel-samd/asf4/samd51/hal/src/hal_timer.c new file mode 100644 index 000000000..db0bbb8da --- /dev/null +++ b/atmel-samd/asf4/samd51/hal/src/hal_timer.c @@ -0,0 +1,263 @@ +/** + * \file + * + * \brief Timer functionality implementation. + * + * Copyright (C) 2014 - 2016 Atmel Corporation. All rights reserved. + * + * \asf_license_start + * + * \page License + * + * 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. The name of Atmel may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * 4. This software may only be redistributed and used in connection with an + * Atmel microcontroller product. + * + * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE + * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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. + * + * \asf_license_stop + * + */ + +#include "hal_timer.h" +#include <utils_assert.h> +#include <utils.h> +#include <hal_atomic.h> +#include <hpl_irq.h> + +/** + * \brief Driver version + */ +#define DRIVER_VERSION 0x00000001u + +/** + * \brief Timer flags + */ +#define TIMER_FLAG_QUEUE_IS_TAKEN 1 +#define TIMER_FLAG_INTERRUPT_TRIGERRED 2 + +static void timer_add_timer_task(struct list_descriptor *list, struct timer_task *const new_task, const uint32_t time); +static void timer_process_counted(struct _timer_device *device); + +/** + * \brief Initialize timer + */ +int32_t timer_init(struct timer_descriptor *const descr, void *const hw, struct _timer_hpl_interface *const func) +{ + ASSERT(descr && hw); + _timer_init(&descr->device, hw); + descr->time = 0; + descr->device.timer_cb.period_expired = timer_process_counted; + + return ERR_NONE; +} + +/** + * \brief Deinitialize timer + */ +int32_t timer_deinit(struct timer_descriptor *const descr) +{ + ASSERT(descr); + _timer_deinit(&descr->device); + + return ERR_NONE; +} + +/** + * \brief Start timer + */ +int32_t timer_start(struct timer_descriptor *const descr) +{ + ASSERT(descr); + if (_timer_is_started(&descr->device)) { + return ERR_DENIED; + } + _timer_start(&descr->device); + + return ERR_NONE; +} + +/** + * \brief Stop timer + */ +int32_t timer_stop(struct timer_descriptor *const descr) +{ + ASSERT(descr); + if (!_timer_is_started(&descr->device)) { + return ERR_DENIED; + } + _timer_stop(&descr->device); + + return ERR_NONE; +} + +/** + * \brief Set amount of clock cycler per timer tick + */ +int32_t timer_set_clock_cycles_per_tick(struct timer_descriptor *const descr, const uint32_t clock_cycles) +{ + ASSERT(descr); + _timer_set_period(&descr->device, clock_cycles); + + return ERR_NONE; +} + +/** + * \brief Add timer task + */ +int32_t timer_add_task(struct timer_descriptor *const descr, struct timer_task *const task) +{ + ASSERT(descr && task); + + descr->flags |= TIMER_FLAG_QUEUE_IS_TAKEN; + if (is_list_element(&descr->tasks, task)) { + descr->flags &= ~TIMER_FLAG_QUEUE_IS_TAKEN; + ASSERT(false); + return ERR_ALREADY_INITIALIZED; + } + task->time_label = descr->time; + timer_add_timer_task(&descr->tasks, task, descr->time); + + descr->flags &= ~TIMER_FLAG_QUEUE_IS_TAKEN; + if (descr->flags & TIMER_FLAG_INTERRUPT_TRIGERRED) { + CRITICAL_SECTION_ENTER() + descr->flags &= ~TIMER_FLAG_INTERRUPT_TRIGERRED; + _timer_set_irq(&descr->device); + CRITICAL_SECTION_LEAVE() + } + + return ERR_NONE; +} + +/** + * \brief Remove timer task + */ +int32_t timer_remove_task(struct timer_descriptor *const descr, const struct timer_task *const task) +{ + ASSERT(descr && task); + + descr->flags |= TIMER_FLAG_QUEUE_IS_TAKEN; + if (!is_list_element(&descr->tasks, task)) { + descr->flags &= ~TIMER_FLAG_QUEUE_IS_TAKEN; + ASSERT(false); + return ERR_NOT_FOUND; + } + list_delete_element(&descr->tasks, task); + + descr->flags &= ~TIMER_FLAG_QUEUE_IS_TAKEN; + if (descr->flags & TIMER_FLAG_INTERRUPT_TRIGERRED) { + CRITICAL_SECTION_ENTER() + descr->flags &= ~TIMER_FLAG_INTERRUPT_TRIGERRED; + _timer_set_irq(&descr->device); + CRITICAL_SECTION_LEAVE() + } + + return ERR_NONE; +} + +/** + * \brief Retrieve the amount of clock cycles in a tick + */ +int32_t timer_get_clock_cycles_in_tick(const struct timer_descriptor *const descr, uint32_t *const cycles) +{ + ASSERT(descr && cycles); + *cycles = _timer_get_period(&descr->device); + return ERR_NONE; +} + +/** + * \brief Retrieve the current driver version + */ +uint32_t timer_get_version(void) +{ + return DRIVER_VERSION; +} + +/** + * \internal Insert a timer task into sorted timer's list + * + * \param[in] head The pointer to the head of timer task list + * \param[in] task The pointer to task to add + * \param[in] time Current timer time + */ +static void timer_add_timer_task(struct list_descriptor *list, struct timer_task *const new_task, const uint32_t time) +{ + struct timer_task *it, *prev = NULL, *head = (struct timer_task *)list_get_head(list); + + if (!head) { + list_insert_as_head(list, new_task); + return; + } + + for (it = head; it; it = (struct timer_task *)list_get_next_element(it)) { + uint32_t time_left; + + if (it->time_label <= time) { + time_left = it->interval - (time - it->time_label); + } else { + time_left = it->interval - (0xFFFFFFFF - it->time_label) - time; + } + if (time_left >= new_task->interval) + break; + prev = it; + } + + if (it == head) { + list_insert_as_head(list, new_task); + } else { + list_insert_after(prev, new_task); + } +} + +/** + * \internal Process interrupts + */ +static void timer_process_counted(struct _timer_device *device) +{ + #pragma GCC diagnostic push + #pragma GCC diagnostic ignored "-Wcast-align" + struct timer_descriptor *timer = CONTAINER_OF(device, struct timer_descriptor, device); + #pragma GCC diagnostic pop + struct timer_task * it = (struct timer_task *)list_get_head(&timer->tasks); + uint32_t time = ++timer->time; + + if ((timer->flags & TIMER_FLAG_QUEUE_IS_TAKEN) || (timer->flags & TIMER_FLAG_INTERRUPT_TRIGERRED)) { + timer->flags |= TIMER_FLAG_INTERRUPT_TRIGERRED; + return; + } + + while (it && ((time - it->time_label) >= it->interval)) { + struct timer_task *tmp = it; + + list_remove_head(&timer->tasks); + if (TIMER_TASK_REPEAT == tmp->mode) { + tmp->time_label = time; + timer_add_timer_task(&timer->tasks, tmp, time); + } + it = (struct timer_task *)list_get_head(&timer->tasks); + + tmp->cb(tmp); + } +} |