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/*
* Copyright (c) 2022 - 2024, Nordic Semiconductor ASA
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*
* 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 the copyright holder nor the names of its
* contributors 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.
*/
#include <nrfx_example.h>
#include <nrfx_timer.h>
#define NRFX_LOG_MODULE EXAMPLE
#define NRFX_EXAMPLE_CONFIG_LOG_ENABLED 1
#define NRFX_EXAMPLE_CONFIG_LOG_LEVEL 3
#include <nrfx_log.h>
/**
* @defgroup nrfx_timer_counter_example Counter example
* @{
* @ingroup nrfx_timer_examples
*
* @brief Example showing basic functionality of nrfx_timer driver in Timer Mode and Counter Mode.
*
* @details Application initializes nrfx_timer driver. The @ref timer_handler() is executed
* regularly after specified time ( @ref TIME_TO_WAIT_MS ). Moreover, @ref timer_handler()
* is executed when the counter value is equal to @ref COUNTER_MAX_VAL.
*/
/** @brief Symbol specifying timer instance to be used in timer mode (T). */
#define TIMER_T_INST_IDX 0
/** @brief Symbol specifying timer instance to be used in counter mode (C). */
#define TIMER_C_INST_IDX 1
/** @brief Symbol specifying time in milliseconds to wait for handler execution. */
#define TIME_TO_WAIT_MS 1000UL
/** @brief Symbol specifying maximum value of the timer. */
#define TIMER_MAX_VAL 3UL
/** @brief Symbol specifying maximum value of the counter. */
#define COUNTER_MAX_VAL 3UL
/** @brief Symbol specifying the initial value of the timer. */
#define TIMER_START_VAL 1UL
/** @brief Global variable that is used to increment the value of a counter. */
static volatile bool m_counter_inc_flag = false;
/**
* @brief Function for handling TIMER driver events.
*
* @param[in] event_type Timer event.
* @param[in] p_context General purpose parameter set during initialization of
* the timer. This parameter can be used to pass
* additional information to the handler function, for
* example, the timer ID. In this example p_context is used to
* pass address of Timer instance that calls this handler.
*/
static void timer_handler(nrf_timer_event_t event_type, void * p_context)
{
nrfx_timer_t * timer_inst = p_context;
static uint32_t timer_val = TIMER_START_VAL;
/* Creating timer driver instances to ensure that timer_X_inst.instance_id field matches
* timer_inst->instance_id. For example if user enables only timer2 with timer1 and timer0
* disabled, then timer2->instance_id == 0.
*/
nrfx_timer_t timer_t_inst = NRFX_TIMER_INSTANCE(TIMER_T_INST_IDX);
nrfx_timer_t timer_c_inst = NRFX_TIMER_INSTANCE(TIMER_C_INST_IDX);
if (timer_inst->instance_id == timer_t_inst.instance_id)
{
/* Configuring timer to count form TIMER_START_VAL to TIMER_MAX_VAL */
NRFX_LOG_INFO("Timer: %u", timer_val);
(timer_val == TIMER_MAX_VAL) ? timer_val = TIMER_START_VAL : timer_val++;
if (timer_val == TIMER_START_VAL)
{
m_counter_inc_flag = true;
}
}
else if (timer_inst->instance_id == timer_c_inst.instance_id)
{
NRFX_LOG_INFO("Counter finished");
}
}
/**
* @brief Function for application main entry.
*
* @return Nothing.
*/
int main(void)
{
nrfx_err_t status;
(void)status;
#if defined(__ZEPHYR__)
IRQ_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_TIMER_INST_GET(TIMER_T_INST_IDX)), IRQ_PRIO_LOWEST,
NRFX_TIMER_INST_HANDLER_GET(TIMER_T_INST_IDX), 0, 0);
IRQ_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_TIMER_INST_GET(TIMER_C_INST_IDX)), IRQ_PRIO_LOWEST,
NRFX_TIMER_INST_HANDLER_GET(TIMER_C_INST_IDX), 0, 0);
#endif
NRFX_EXAMPLE_LOG_INIT();
NRFX_LOG_INFO("Starting nrfx_timer basic counter example.");
NRFX_EXAMPLE_LOG_PROCESS();
/* Configuring timer instances, one in timer mode and one in counter mode.
* Assigning their own addresses to p_context variable - in order to reference them
* in timer_handler() function. Setting frequency to the base frequency value of the
* specified timer instance.
*/
nrfx_timer_t timer_t_inst = NRFX_TIMER_INSTANCE(TIMER_T_INST_IDX);
uint32_t base_frequency = NRF_TIMER_BASE_FREQUENCY_GET(timer_t_inst.p_reg);
nrfx_timer_config_t config = NRFX_TIMER_DEFAULT_CONFIG(base_frequency);
config.bit_width = NRF_TIMER_BIT_WIDTH_32;
config.p_context = &timer_t_inst;
status = nrfx_timer_init(&timer_t_inst, &config, timer_handler);
NRFX_ASSERT(status == NRFX_SUCCESS);
nrfx_timer_t timer_c_inst = NRFX_TIMER_INSTANCE(TIMER_C_INST_IDX);
config.frequency = NRF_TIMER_BASE_FREQUENCY_GET(timer_c_inst.p_reg);
config.mode = NRF_TIMER_MODE_COUNTER;
config.p_context = &timer_c_inst;
status = nrfx_timer_init(&timer_c_inst, &config, timer_handler);
NRFX_ASSERT(status == NRFX_SUCCESS);
NRFX_LOG_INFO("Time between timer ticks: %lu ms", TIME_TO_WAIT_MS);
/* Creating variable desired_ticks to store the output of nrfx_timer_ms_to_ticks function. */
uint32_t desired_ticks = nrfx_timer_ms_to_ticks(&timer_t_inst, TIME_TO_WAIT_MS);
/* Setting the timer (in timer mode) channel NRF_TIMER_CC_CHANNEL0 in the extended compare
* mode to clear the timer and trigger an interrupt if internal counter register is equal
* to desired_ticks.
*/
nrfx_timer_extended_compare(&timer_t_inst, NRF_TIMER_CC_CHANNEL0, desired_ticks,
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
/* Setting the timer (in counter mode) channel NRF_TIMER_CC_CHANNEL0 in the extended compare
* mode to stop the timer and trigger an interrupt if internal counter register is equal
* to COUNTER_MAX_VAL.
*/
nrfx_timer_extended_compare(&timer_c_inst, NRF_TIMER_CC_CHANNEL0, COUNTER_MAX_VAL,
NRF_TIMER_SHORT_COMPARE0_STOP_MASK, true);
nrfx_timer_enable(&timer_c_inst);
nrfx_timer_enable(&timer_t_inst);
NRFX_LOG_INFO("Timer status: %s",
nrfx_timer_is_enabled(&timer_t_inst) ? "enabled" : "disabled");
NRFX_LOG_INFO("Counter status: %s",
nrfx_timer_is_enabled(&timer_c_inst) ? "enabled" : "disabled");
uint32_t timer_c_curr_val = 0;
while (1)
{
if (m_counter_inc_flag)
{
nrfx_timer_increment(&timer_c_inst);
timer_c_curr_val = nrfx_timer_capture(&timer_c_inst, NRF_TIMER_CC_CHANNEL1);
NRFX_LOG_INFO("Counter: %u / %lu", timer_c_curr_val, COUNTER_MAX_VAL);
m_counter_inc_flag = false;
if (timer_c_curr_val >= COUNTER_MAX_VAL)
{
nrfx_timer_disable(&timer_t_inst);
nrfx_timer_disable(&timer_c_inst);
NRFX_LOG_INFO("Timer status: %s",
nrfx_timer_is_enabled(&timer_t_inst) ? "enabled" : "disabled");
NRFX_LOG_INFO("Counter status: %s",
nrfx_timer_is_enabled(&timer_c_inst) ? "enabled" : "disabled");
}
}
NRFX_EXAMPLE_LOG_PROCESS();
}
}
/** @} */
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