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@ -1,207 +1,140 @@
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/*
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* Copyright (c) 2022 - 2024, Nordic Semiconductor ASA
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* All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <nrfx_example.h>
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#include <nrfx_timer.h>
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#include <nrf_gpio.h>
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#include <nrf_timer.h>
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#define NRFX_LOG_MODULE EXAMPLE
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#define NRFX_EXAMPLE_CONFIG_LOG_ENABLED 1
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#define NRFX_EXAMPLE_CONFIG_LOG_LEVEL 3
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#include <nrfx_log.h>
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#define TST_CLK_PIN 17 //this is led 0 pin on nrf52-dk
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#define FREQ_MEASURE_PIN 11
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/**
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* @defgroup nrfx_timer_counter_example Counter example
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* @{
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* @ingroup nrfx_timer_examples
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*
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* @brief Example showing basic functionality of nrfx_timer driver in Timer Mode and Counter Mode.
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*
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* @details Application initializes nrfx_timer driver. The @ref timer_handler() is executed
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* regularly after specified time ( @ref TIME_TO_WAIT_MS ). Moreover, @ref timer_handler()
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* is executed when the counter value is equal to @ref COUNTER_MAX_VAL.
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*/
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/** @brief Symbol specifying timer instance to be used in timer mode (T). */
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#define TIMER_T_INST_IDX 0
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/** @brief Symbol specifying timer instance to be used in counter mode (C). */
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#define TIMER_C_INST_IDX 1
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/** @brief Symbol specifying time in milliseconds to wait for handler execution. */
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#define TIME_TO_WAIT_MS 1000UL
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/** @brief Symbol specifying maximum value of the timer. */
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#define TIMER_MAX_VAL 3UL
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/** @brief Symbol specifying maximum value of the counter. */
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#define COUNTER_MAX_VAL 3UL
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/** @brief Symbol specifying the initial value of the timer. */
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#define TIMER_START_VAL 1UL
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/** @brief Global variable that is used to increment the value of a counter. */
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static volatile bool m_counter_inc_flag = false;
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/**
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* @brief Function for handling TIMER driver events.
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*
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* @param[in] event_type Timer event.
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* @param[in] p_context General purpose parameter set during initialization of
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* the timer. This parameter can be used to pass
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* additional information to the handler function, for
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* example, the timer ID. In this example p_context is used to
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* pass address of Timer instance that calls this handler.
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*/
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static void timer_handler(nrf_timer_event_t event_type, void * p_context)
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void gpio_clock_8m(uint32_t pin_number)
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{
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nrfx_timer_t * timer_inst = p_context;
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static uint32_t timer_val = TIMER_START_VAL;
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/* Creating timer driver instances to ensure that timer_X_inst.instance_id field matches
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* timer_inst->instance_id. For example if user enables only timer2 with timer1 and timer0
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* disabled, then timer2->instance_id == 0.
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*/
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nrfx_timer_t timer_t_inst = NRFX_TIMER_INSTANCE(TIMER_T_INST_IDX);
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nrfx_timer_t timer_c_inst = NRFX_TIMER_INSTANCE(TIMER_C_INST_IDX);
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NRF_TIMER0->PRESCALER = 0; // 16MHz
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NRF_TIMER0->SHORTS = TIMER_SHORTS_COMPARE0_CLEAR_Msk;
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NRF_TIMER0->CC[0] = 3; //1 for 16/2=8MHz for, 2 for 8/2=4MHz, 4 for 4/2=2MHz etc..
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NRF_TIMER0->BITMODE = (TIMER_BITMODE_BITMODE_16Bit << TIMER_BITMODE_BITMODE_Pos);
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//using config [1] since [0]
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NRF_GPIOTE->CONFIG[1] = GPIOTE_CONFIG_MODE_Task | (pin_number << GPIOTE_CONFIG_PSEL_Pos) |
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(GPIOTE_CONFIG_POLARITY_Toggle << GPIOTE_CONFIG_POLARITY_Pos);
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if (timer_inst->instance_id == timer_t_inst.instance_id)
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{
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/* Configuring timer to count form TIMER_START_VAL to TIMER_MAX_VAL */
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NRFX_LOG_INFO("Timer: %u", timer_val);
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(timer_val == TIMER_MAX_VAL) ? timer_val = TIMER_START_VAL : timer_val++;
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/*Connect TIMER event to GPIOTE out task*/
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NRF_PPI->CHEN |= 1 << 3;
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*(&(NRF_PPI->CH3_EEP)) = (uint32_t) &NRF_TIMER0->EVENTS_COMPARE[0];
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*(&(NRF_PPI->CH3_TEP)) = (uint32_t) &NRF_GPIOTE->TASKS_OUT[1];
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NRF_PPI->CHENSET |= 1 << 3;
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if (timer_val == TIMER_START_VAL)
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{
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m_counter_inc_flag = true;
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/*Starts clock signal*/
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NRF_TIMER0->TASKS_START = 1;
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}
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}
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else if (timer_inst->instance_id == timer_c_inst.instance_id)
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static void timer_init() //gate timer
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{
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NRFX_LOG_INFO("Counter finished");
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NRF_TIMER1->TASKS_STOP = 1; //trigger stop
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NRF_TIMER1->MODE = TIMER_MODE_MODE_Timer; //mode timer
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NRF_TIMER1->PRESCALER = 8; // Fhck / 2^8
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//total gate time of timer 62500 - 1s
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NRF_TIMER1->CC[0] = 62501; //end gate count
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NRF_TIMER1->CC[1] = 1; //start gate count. don't start at 0 to no start on clear.
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NRF_TIMER1->BITMODE = (TIMER_BITMODE_BITMODE_16Bit << TIMER_BITMODE_BITMODE_Pos);
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NRF_TIMER1->TASKS_CLEAR = 1; //trigger zero timer
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NRF_TIMER1->INTENSET = (TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos); //interrupt on end gate count
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NRF_TIMER1->EVENTS_COMPARE[0] = 0; //rest event flag for gate end
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NRF_TIMER1->EVENTS_COMPARE[1] = 0; //rest event flag for gate start
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}
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static void counter_init() //actual counter
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{
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NRF_TIMER2->TASKS_STOP = 1; //trigger stop
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NRF_TIMER2->MODE = TIMER_MODE_MODE_Counter; //counter
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NRF_TIMER2->BITMODE = (TIMER_BITMODE_BITMODE_24Bit << TIMER_BITMODE_BITMODE_Pos);
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NRF_TIMER2->TASKS_CLEAR = 1; //trigger zero counter
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NRF_TIMER2->EVENTS_COMPARE[0] = 0; //reset event for compare
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}
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//counter input pin setting
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static void gpiote_init(uint32_t pin)
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{
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NRF_GPIOTE->CONFIG[0] = 0x01 << 0; // MODE: Event
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NRF_GPIOTE->CONFIG[0] |= pin << 8; // Pin number
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NRF_GPIOTE->CONFIG[0] |= GPIOTE_CONFIG_POLARITY_LoToHi << 16; // Event rising edge
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}
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//hardware trigger: stop of counter on event of end timer1 gate
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static void ppi_timer_stop_counter_init()
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{
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NRF_PPI->CHEN |= 1 << 2; //channel
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*(&(NRF_PPI->CH2_EEP)) = (uint32_t)&NRF_TIMER1->EVENTS_COMPARE[0]; //attach end gate event
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*(&(NRF_PPI->CH2_TEP)) = (uint32_t)&NRF_TIMER2->TASKS_STOP; //to counter stop trigger
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NRF_PPI->CHENSET |= 1 << 2; //set channel
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}
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//hardware trigger: start of counter on event of begin timer1 (gate) event.gate
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static void ppi_timer_start_counter_init()
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{
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NRF_PPI->CHEN |= 1 << 4;// channel
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*(&(NRF_PPI->CH4_EEP)) = (uint32_t)&NRF_TIMER1->EVENTS_COMPARE[1]; //attach gate start event
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*(&(NRF_PPI->CH4_TEP)) = (uint32_t)&NRF_TIMER2->TASKS_START; //to counter start trigger
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NRF_PPI->CHENSET |= 1 << 4;
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}
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static void ppi_gpiote_counter_init()
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//hardware attachment for the gpiote that was selected above
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{
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NRF_PPI->CHEN |= 1 << 1;
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*(&(NRF_PPI->CH1_EEP)) = (uint32_t)&NRF_GPIOTE->EVENTS_IN[0]; //attach pin change
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*(&(NRF_PPI->CH1_TEP)) = (uint32_t)&NRF_TIMER2->TASKS_COUNT;//to one count
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NRF_PPI->CHENSET |= 1 << 1;
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}
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//gate end interrupt handler. Count is done at hardware and percice interrupt execution isnt critical
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void TIMER1_IRQHandler(void)
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{
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if (NRF_TIMER1->EVENTS_COMPARE[0] != 0) //end gate event
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{
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NRF_TIMER1->EVENTS_COMPARE[0] = 0; //reset end gate flag
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NRF_TIMER1->EVENTS_COMPARE[1] = 0; //reset start gate flag
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NRF_TIMER2->TASKS_CAPTURE[0] = 1; //trigger get counter value
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printk("cc: %dHz\n", NRF_TIMER2->CC[0]); //report to serial console
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NRF_TIMER1->TASKS_CLEAR = 1; //reset timer
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NRF_TIMER2->TASKS_CLEAR = 1; //reset counter
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NRF_TIMER1->TASKS_START = 1; //start next count gate
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}
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}
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/**
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* @brief Function for application main entry.
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*
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* @return Nothing.
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*/
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int main(void)
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{
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nrfx_err_t status;
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(void)status;
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NVIC_EnableIRQ(TIMER1_IRQn); //enable timer1 interrupt
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IRQ_DIRECT_CONNECT(TIMER1_IRQn, 3, TIMER1_IRQHandler, 0); //link interrupt flag to handler
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NVIC_SetPriority(TIMER1_IRQn, 3); //set interrupt execution priority
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#if defined(__ZEPHYR__)
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IRQ_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_TIMER_INST_GET(TIMER_T_INST_IDX)), IRQ_PRIO_LOWEST,
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NRFX_TIMER_INST_HANDLER_GET(TIMER_T_INST_IDX), 0, 0);
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IRQ_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_TIMER_INST_GET(TIMER_C_INST_IDX)), IRQ_PRIO_LOWEST,
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NRFX_TIMER_INST_HANDLER_GET(TIMER_C_INST_IDX), 0, 0);
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#endif
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struct device *dev;//port container for gpio management
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dev = device_get_binding("GPIO_14"); //button SW1
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/**/
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//nrf_gpio_cfg(dev, FREQ_MEASURE_PIN, NRF_GPIO_DIR_INPUT|GPIO_ACTIVE_HIGH|GPIO_PULL_DOWN); //p0.11 freq in
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nrf_gpio_cfg_input(14, NRF_GPIO_PIN_PULLUP);
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NRFX_EXAMPLE_LOG_INIT();
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//init freq count hardware
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counter_init();
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timer_init();
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gpiote_init(FREQ_MEASURE_PIN);
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ppi_gpiote_counter_init();
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ppi_timer_stop_counter_init();
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ppi_timer_start_counter_init();
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NRFX_LOG_INFO("Starting nrfx_timer basic counter example.");
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NRFX_EXAMPLE_LOG_PROCESS();
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//test clock hardware
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gpio_clock_8m(TST_CLK_PIN);
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/* Configuring timer instances, one in timer mode and one in counter mode.
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* Assigning their own addresses to p_context variable - in order to reference them
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* in timer_handler() function. Setting frequency to the base frequency value of the
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* specified timer instance.
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*/
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nrfx_timer_t timer_t_inst = NRFX_TIMER_INSTANCE(TIMER_T_INST_IDX);
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uint32_t base_frequency = NRF_TIMER_BASE_FREQUENCY_GET(timer_t_inst.p_reg);
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nrfx_timer_config_t config = NRFX_TIMER_DEFAULT_CONFIG(base_frequency);
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config.bit_width = NRF_TIMER_BIT_WIDTH_32;
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config.p_context = &timer_t_inst;
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status = nrfx_timer_init(&timer_t_inst, &config, timer_handler);
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NRFX_ASSERT(status == NRFX_SUCCESS);
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nrfx_timer_t timer_c_inst = NRFX_TIMER_INSTANCE(TIMER_C_INST_IDX);
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config.frequency = NRF_TIMER_BASE_FREQUENCY_GET(timer_c_inst.p_reg);
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config.mode = NRF_TIMER_MODE_COUNTER;
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config.p_context = &timer_c_inst;
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status = nrfx_timer_init(&timer_c_inst, &config, timer_handler);
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NRFX_ASSERT(status == NRFX_SUCCESS);
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NRFX_LOG_INFO("Time between timer ticks: %lu ms", TIME_TO_WAIT_MS);
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/* Creating variable desired_ticks to store the output of nrfx_timer_ms_to_ticks function. */
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uint32_t desired_ticks = nrfx_timer_ms_to_ticks(&timer_t_inst, TIME_TO_WAIT_MS);
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/* Setting the timer (in timer mode) channel NRF_TIMER_CC_CHANNEL0 in the extended compare
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* mode to clear the timer and trigger an interrupt if internal counter register is equal
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* to desired_ticks.
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*/
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nrfx_timer_extended_compare(&timer_t_inst, NRF_TIMER_CC_CHANNEL0, desired_ticks,
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NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
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/* Setting the timer (in counter mode) channel NRF_TIMER_CC_CHANNEL0 in the extended compare
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* mode to stop the timer and trigger an interrupt if internal counter register is equal
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* to COUNTER_MAX_VAL.
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*/
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nrfx_timer_extended_compare(&timer_c_inst, NRF_TIMER_CC_CHANNEL0, COUNTER_MAX_VAL,
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NRF_TIMER_SHORT_COMPARE0_STOP_MASK, true);
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nrfx_timer_enable(&timer_c_inst);
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nrfx_timer_enable(&timer_t_inst);
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NRFX_LOG_INFO("Timer status: %s",
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nrfx_timer_is_enabled(&timer_t_inst) ? "enabled" : "disabled");
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NRFX_LOG_INFO("Counter status: %s",
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nrfx_timer_is_enabled(&timer_c_inst) ? "enabled" : "disabled");
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uint32_t timer_c_curr_val = 0;
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while (1)
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{
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if (m_counter_inc_flag)
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{
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nrfx_timer_increment(&timer_c_inst);
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timer_c_curr_val = nrfx_timer_capture(&timer_c_inst, NRF_TIMER_CC_CHANNEL1);
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NRFX_LOG_INFO("Counter: %u / %lu", timer_c_curr_val, COUNTER_MAX_VAL);
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m_counter_inc_flag = false;
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if (timer_c_curr_val >= COUNTER_MAX_VAL)
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{
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nrfx_timer_disable(&timer_t_inst);
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nrfx_timer_disable(&timer_c_inst);
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NRFX_LOG_INFO("Timer status: %s",
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nrfx_timer_is_enabled(&timer_t_inst) ? "enabled" : "disabled");
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NRFX_LOG_INFO("Counter status: %s",
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nrfx_timer_is_enabled(&timer_c_inst) ? "enabled" : "disabled");
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//start freq count task
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NRF_TIMER1->TASKS_START = 1;
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while (1) {
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//manage loop
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}
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}
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NRFX_EXAMPLE_LOG_PROCESS();
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}
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}
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/** @} */
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Miguel Iglesias