Im trying to measure the time between 2 consecutive rising endges (Rising and Falling Edge together) on GPIO continuously but I did not find any leads. will appreciate the support.
Im trying to measure the time between 2 consecutive rising endges (Rising and Falling Edge together) on GPIO continuously but I did not find any leads. will appreciate the support.
after implementing the ppi example I start getting these values. But these values are in ms. How can I increase to nano seconds only the output so that i can capture upto 900 nano seconds
#include <stdint.h>
#include "nrf_delay.h"
#include "app_error.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
//nrf_drv_timer_us_to_ticks
#define PPI_EXAMPLE_TIMERS_us_PHASE_SHIFT_DELAY (1) // 1s = 10 * 100ms (Timer 0 interrupt)
#define PPI_EXAMPLE_TIMER0_us_INTERVAL (1) // Timer interval in milliseconds
#define PPI_EXAMPLE_TIMER1_us_INTERVAL (1) // Timer interval in milliseconds
#define PPI_EXAMPLE_TIMER2_us_INTERVAL (1) // Timer interval in milliseconds
static const nrf_drv_timer_t m_timer0 = NRF_DRV_TIMER_INSTANCE(0);
static const nrf_drv_timer_t m_timer1 = NRF_DRV_TIMER_INSTANCE(1);
static const nrf_drv_timer_t m_timer2 = NRF_DRV_TIMER_INSTANCE(2);
static nrf_ppi_channel_t m_ppi_channel1;
static nrf_ppi_channel_t m_ppi_channel2;
static volatile uint32_t m_counter;
static void timer0_event_handler(nrf_timer_event_t event_type, void * p_context)
{
++m_counter;
}
/* Timer event handler. Not used since Timer1 and Timer2 are used only for PPI. */
static void empty_timer_handler(nrf_timer_event_t event_type, void * p_context)
{
}
/** @brief Function for initializing the PPI peripheral.
*/
static void ppi_init(void)
{
uint32_t err_code = NRF_SUCCESS;
err_code = nrf_drv_ppi_init();
APP_ERROR_CHECK(err_code);
/* Configure 1st available PPI channel to stop TIMER0 counter on TIMER1 COMPARE[0] match,
* which is every even number of seconds.
*/
err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel1);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_assign(m_ppi_channel1,
nrf_drv_timer_event_address_get(&m_timer1,
NRF_TIMER_EVENT_COMPARE0),
nrf_drv_timer_task_address_get(&m_timer0,
NRF_TIMER_TASK_STOP));
APP_ERROR_CHECK(err_code);
/* Configure 2nd available PPI channel to start TIMER0 counter at TIMER2 COMPARE[0] match,
* which is every odd number of seconds.
*/
err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel2);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_assign(m_ppi_channel2,
nrf_drv_timer_event_address_get(&m_timer2,
NRF_TIMER_EVENT_COMPARE0),
nrf_drv_timer_task_address_get(&m_timer0,
NRF_TIMER_TASK_START));
APP_ERROR_CHECK(err_code);
// Enable both configured PPI channels
err_code = nrf_drv_ppi_channel_enable(m_ppi_channel1);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_enable(m_ppi_channel2);
APP_ERROR_CHECK(err_code);
}
/** @brief Function for Timer 0 initialization.
* @details Timer 0 will be stopped and started by Timer 1 and Timer 2 respectively using PPI.
* It is configured to generate an interrupt every 100ms.
*/
static void timer0_init(void)
{
// Check TIMER0 configuration for details.
nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
timer_cfg.frequency = NRF_TIMER_FREQ_16MHz;
ret_code_t err_code = nrf_drv_timer_init(&m_timer0, &timer_cfg, timer0_event_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&m_timer0,
NRF_TIMER_CC_CHANNEL0,
nrf_drv_timer_ms_to_ticks(&m_timer0,
PPI_EXAMPLE_TIMER0_us_INTERVAL),
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
true);
}
/** @brief Function for Timer 1 initialization.
* @details Initializes TIMER1 peripheral to generate an event every 2 seconds. The events are
* generated at even numbers of seconds after starting the example (2, 4, 6 ...) and they
* are used to stop TIMER0 via PPI: TIMER1->EVENT_COMPARE[0] triggers TIMER0->TASK_STOP.
*/
static void timer1_init(void)
{
// Check TIMER1 configuration for details.
nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
timer_cfg.frequency = NRF_TIMER_FREQ_16MHz;
ret_code_t err_code = nrf_drv_timer_init(&m_timer1, &timer_cfg, empty_timer_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&m_timer1,
NRF_TIMER_CC_CHANNEL0,
nrf_drv_timer_ms_to_ticks(&m_timer1,
PPI_EXAMPLE_TIMER1_us_INTERVAL),
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
false);
}
/** @brief Function for Timer 2 initialization.
* @details Initializes TIMER2 peripheral to generate an event every 2 seconds. The events are
* generated at odd numbers of seconds after starting the example (3, 5, 7 ...) and they
* are used to start TIMER0 via PPI: TIMER2->EVENT_COMPARE[0] triggers TIMER0->TASK_START.
*/
static void timer2_init(void)
{
// Check TIMER2 configuration for details.
nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
timer_cfg.frequency = NRF_TIMER_FREQ_16MHz;
ret_code_t err_code = nrf_drv_timer_init(&m_timer2, &timer_cfg, empty_timer_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&m_timer2,
NRF_TIMER_CC_CHANNEL0,
nrf_drv_timer_ms_to_ticks(&m_timer2,
PPI_EXAMPLE_TIMER2_us_INTERVAL),
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
false);
}
/**
* @brief Function for application main entry.
*/
int main(void)
{
uint32_t old_val = 0;
uint32_t err_code;
err_code = NRF_LOG_INIT(NULL);
APP_ERROR_CHECK(err_code);
NRF_LOG_DEFAULT_BACKENDS_INIT();
ppi_init();
timer0_init(); // Timer used to increase m_counter every 100ms.
timer1_init(); // Timer to generate events on even number of seconds - stopping Timer 0
timer2_init(); // Timer to generate events on odd number of seconds - starting Timer 0
NRF_LOG_INFO("PPI example started.");
// Start clock.
nrf_drv_timer_enable(&m_timer0);
/* Below delay is implemented to ensure that Timer0 interrupt will execute before PPI action.
* Please be aware that such solution was tested only in this simple example code. In case
* of more complex systems with higher level interrupts this may lead to not correct timers
* synchronization.
*/
nrf_delay_us(1);
nrf_drv_timer_enable(&m_timer1);
m_counter = (uint32_t)-PPI_EXAMPLE_TIMERS_us_PHASE_SHIFT_DELAY;
// Timer 2 will start one second after Timer 1 (m_counter will equal 0 after 1s)
// while (m_counter != 0)
// {
// just wait
//}
nrf_drv_timer_enable(&m_timer2);
while (true)
{
uint32_t counter = m_counter;
if (old_val != counter)
{
old_val = counter;
NRF_LOG_INFO("Current count: %u", counter);
NRF_LOG_FLUSH();
}
}
}
/** @} */
#include <stdint.h>
#include "nrf_delay.h"
#include "app_error.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
//nrf_drv_timer_us_to_ticks
#define PPI_EXAMPLE_TIMERS_us_PHASE_SHIFT_DELAY (1) // 1s = 10 * 100ms (Timer 0 interrupt)
#define PPI_EXAMPLE_TIMER0_us_INTERVAL (1) // Timer interval in milliseconds
#define PPI_EXAMPLE_TIMER1_us_INTERVAL (1) // Timer interval in milliseconds
#define PPI_EXAMPLE_TIMER2_us_INTERVAL (1) // Timer interval in milliseconds
static const nrf_drv_timer_t m_timer0 = NRF_DRV_TIMER_INSTANCE(0);
static const nrf_drv_timer_t m_timer1 = NRF_DRV_TIMER_INSTANCE(1);
static const nrf_drv_timer_t m_timer2 = NRF_DRV_TIMER_INSTANCE(2);
static nrf_ppi_channel_t m_ppi_channel1;
static nrf_ppi_channel_t m_ppi_channel2;
static volatile uint32_t m_counter;
static void timer0_event_handler(nrf_timer_event_t event_type, void * p_context)
{
++m_counter;
}
/* Timer event handler. Not used since Timer1 and Timer2 are used only for PPI. */
static void empty_timer_handler(nrf_timer_event_t event_type, void * p_context)
{
}
/** @brief Function for initializing the PPI peripheral.
*/
static void ppi_init(void)
{
uint32_t err_code = NRF_SUCCESS;
err_code = nrf_drv_ppi_init();
APP_ERROR_CHECK(err_code);
/* Configure 1st available PPI channel to stop TIMER0 counter on TIMER1 COMPARE[0] match,
* which is every even number of seconds.
*/
err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel1);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_assign(m_ppi_channel1,
nrf_drv_timer_event_address_get(&m_timer1,
NRF_TIMER_EVENT_COMPARE0),
nrf_drv_timer_task_address_get(&m_timer0,
NRF_TIMER_TASK_STOP));
APP_ERROR_CHECK(err_code);
/* Configure 2nd available PPI channel to start TIMER0 counter at TIMER2 COMPARE[0] match,
* which is every odd number of seconds.
*/
err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel2);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_assign(m_ppi_channel2,
nrf_drv_timer_event_address_get(&m_timer2,
NRF_TIMER_EVENT_COMPARE0),
nrf_drv_timer_task_address_get(&m_timer0,
NRF_TIMER_TASK_START));
APP_ERROR_CHECK(err_code);
// Enable both configured PPI channels
err_code = nrf_drv_ppi_channel_enable(m_ppi_channel1);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_enable(m_ppi_channel2);
APP_ERROR_CHECK(err_code);
}
/** @brief Function for Timer 0 initialization.
* @details Timer 0 will be stopped and started by Timer 1 and Timer 2 respectively using PPI.
* It is configured to generate an interrupt every 100ms.
*/
static void timer0_init(void)
{
// Check TIMER0 configuration for details.
nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
timer_cfg.frequency = NRF_TIMER_FREQ_16MHz;
ret_code_t err_code = nrf_drv_timer_init(&m_timer0, &timer_cfg, timer0_event_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&m_timer0,
NRF_TIMER_CC_CHANNEL0,
nrf_drv_timer_ms_to_ticks(&m_timer0,
PPI_EXAMPLE_TIMER0_us_INTERVAL),
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
true);
}
/** @brief Function for Timer 1 initialization.
* @details Initializes TIMER1 peripheral to generate an event every 2 seconds. The events are
* generated at even numbers of seconds after starting the example (2, 4, 6 ...) and they
* are used to stop TIMER0 via PPI: TIMER1->EVENT_COMPARE[0] triggers TIMER0->TASK_STOP.
*/
static void timer1_init(void)
{
// Check TIMER1 configuration for details.
nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
timer_cfg.frequency = NRF_TIMER_FREQ_16MHz;
ret_code_t err_code = nrf_drv_timer_init(&m_timer1, &timer_cfg, empty_timer_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&m_timer1,
NRF_TIMER_CC_CHANNEL0,
nrf_drv_timer_ms_to_ticks(&m_timer1,
PPI_EXAMPLE_TIMER1_us_INTERVAL),
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
false);
}
/** @brief Function for Timer 2 initialization.
* @details Initializes TIMER2 peripheral to generate an event every 2 seconds. The events are
* generated at odd numbers of seconds after starting the example (3, 5, 7 ...) and they
* are used to start TIMER0 via PPI: TIMER2->EVENT_COMPARE[0] triggers TIMER0->TASK_START.
*/
static void timer2_init(void)
{
// Check TIMER2 configuration for details.
nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
timer_cfg.frequency = NRF_TIMER_FREQ_16MHz;
ret_code_t err_code = nrf_drv_timer_init(&m_timer2, &timer_cfg, empty_timer_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&m_timer2,
NRF_TIMER_CC_CHANNEL0,
nrf_drv_timer_ms_to_ticks(&m_timer2,
PPI_EXAMPLE_TIMER2_us_INTERVAL),
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
false);
}
/**
* @brief Function for application main entry.
*/
int main(void)
{
uint32_t old_val = 0;
uint32_t err_code;
err_code = NRF_LOG_INIT(NULL);
APP_ERROR_CHECK(err_code);
NRF_LOG_DEFAULT_BACKENDS_INIT();
ppi_init();
timer0_init(); // Timer used to increase m_counter every 100ms.
timer1_init(); // Timer to generate events on even number of seconds - stopping Timer 0
timer2_init(); // Timer to generate events on odd number of seconds - starting Timer 0
NRF_LOG_INFO("PPI example started.");
// Start clock.
nrf_drv_timer_enable(&m_timer0);
/* Below delay is implemented to ensure that Timer0 interrupt will execute before PPI action.
* Please be aware that such solution was tested only in this simple example code. In case
* of more complex systems with higher level interrupts this may lead to not correct timers
* synchronization.
*/
nrf_delay_us(1);
nrf_drv_timer_enable(&m_timer1);
m_counter = (uint32_t)-PPI_EXAMPLE_TIMERS_us_PHASE_SHIFT_DELAY;
// Timer 2 will start one second after Timer 1 (m_counter will equal 0 after 1s)
// while (m_counter != 0)
// {
// just wait
//}
nrf_drv_timer_enable(&m_timer2);
while (true)
{
uint32_t counter = m_counter;
if (old_val != counter)
{
old_val = counter;
NRF_LOG_INFO("Current count: %u", counter);
NRF_LOG_FLUSH();
}
}
}
/** @} */
I changed the frequency from 31250Hz to 16MHz, but resolution did not get affected. The one more thing I did not uses LFCLK (crystal) as this was the optional for custom board.
Hi,
You may try this code instead:
/**
* Copyright (c) 2014 - 2021, 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, except as embedded into a Nordic
* Semiconductor ASA integrated circuit in a product or a software update for
* such product, 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 its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
* Nordic Semiconductor ASA integrated circuit.
*
* 5. Any software provided in binary form under this license must not be reverse
* engineered, decompiled, modified and/or disassembled.
*
* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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 <stdint.h>
#include "nrf_delay.h"
#include "app_error.h"
#include "boards.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"
#include "nrf_drv_gpiote.h"
#include "nrf_delay.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
/* Signal generator output */
#define SIG_OUT_PIN 26
#define SIG_OUT_INTERVAL_US 1
#define SIG_INPUT_PIN 27
static const nrf_drv_timer_t m_timer1 = NRF_DRV_TIMER_INSTANCE(1);
static const nrf_drv_timer_t m_timer2 = NRF_DRV_TIMER_INSTANCE(2);
static const nrf_drv_timer_t m_timer3 = NRF_DRV_TIMER_INSTANCE(3);
static volatile bool m_sample_pending;
/* Timer event handler. Not used since Timer1 and Timer2 are used only for PPI. */
static void empty_timer_handler(nrf_timer_event_t event_type, void * p_context)
{
}
static void signal_capture_handler(nrf_timer_event_t event_type, void * p_context)
{
uint32_t err_code;
uint32_t timer_ticks;
timer_ticks = nrf_drv_timer_capture(&m_timer3, NRF_TIMER_CC_CHANNEL0);
NRF_LOG_INFO("Signal period: " NRF_LOG_FLOAT_MARKER " us", NRF_LOG_FLOAT((float)timer_ticks/16.0f));
nrf_drv_timer_clear(&m_timer3);
nrf_drv_timer_clear(&m_timer2);
m_sample_pending = false;
nrf_drv_gpiote_in_event_disable(SIG_INPUT_PIN);
}
void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
}
static void log_init(void)
{
uint32_t err_code = NRF_LOG_INIT(NULL);
APP_ERROR_CHECK(err_code);
NRF_LOG_DEFAULT_BACKENDS_INIT();
}
static void hf_clock_start(void)
{
/* Start HFXO for better accuracy */
NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
NRF_CLOCK->TASKS_HFCLKSTART = 1;
while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0)
{};
}
static void signal_generator_start(void)
{
uint32_t err_code;
uint32_t out_task_addr;
uint32_t timer_evt0_addr;
nrf_ppi_channel_t ppi_channel;
nrf_drv_gpiote_out_config_t signal_out = GPIOTE_CONFIG_OUT_TASK_TOGGLE(true);
nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
/* Configure timer and output signal */
err_code = nrf_drv_timer_init(&m_timer1, &timer_cfg, empty_timer_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&m_timer1,
NRF_TIMER_CC_CHANNEL0,
nrfx_timer_us_to_ticks(&m_timer1, SIG_OUT_INTERVAL_US),
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
false);
timer_evt0_addr = nrf_drv_timer_compare_event_address_get(&m_timer1,NRF_TIMER_CC_CHANNEL0);
/* Configure GPIOTE task */
err_code = nrf_drv_gpiote_out_init(SIG_OUT_PIN, &signal_out);
APP_ERROR_CHECK(err_code);
out_task_addr = nrf_drv_gpiote_out_task_addr_get(SIG_OUT_PIN);
nrf_drv_gpiote_out_task_enable(SIG_OUT_PIN);
/* Connect timer event to GPIOTE task through PPI */
err_code = nrf_drv_ppi_channel_alloc(&ppi_channel);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_assign(ppi_channel, timer_evt0_addr, out_task_addr);
APP_ERROR_CHECK(err_code);
nrf_drv_ppi_channel_enable(ppi_channel);
/* Start signal generation */
nrf_drv_timer_enable(&m_timer1);
}
static void signal_input_sampling_init(void)
{
uint32_t err_code;
nrf_ppi_channel_t ppi_channel;
uint32_t gpiote_evt_addr;
uint32_t count_task_addr;
uint32_t timer_start_addr;
uint32_t timer_stop_addr;
uint32_t timer_evt0_addr;
uint32_t timer_evt1_addr;
nrf_drv_gpiote_in_config_t input_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(true);
nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
err_code = nrf_drv_gpiote_in_init(SIG_INPUT_PIN, &input_config, in_pin_handler);
APP_ERROR_CHECK(err_code);
gpiote_evt_addr = nrf_drv_gpiote_in_event_addr_get(SIG_INPUT_PIN);
timer_cfg.mode = NRF_TIMER_MODE_COUNTER;
err_code = nrf_drv_timer_init(&m_timer2, &timer_cfg, signal_capture_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_compare(&m_timer2,
NRF_TIMER_CC_CHANNEL0,
1,
false);
nrf_drv_timer_compare(&m_timer2,
NRF_TIMER_CC_CHANNEL1,
2,
true);
count_task_addr = nrf_drv_timer_task_address_get(&m_timer2, NRF_TIMER_TASK_COUNT);
timer_evt0_addr = nrf_drv_timer_compare_event_address_get(&m_timer2, NRF_TIMER_CC_CHANNEL0);
timer_evt1_addr = nrf_drv_timer_compare_event_address_get(&m_timer2, NRF_TIMER_CC_CHANNEL1);
nrf_drv_timer_enable(&m_timer2);
timer_cfg.mode = NRF_TIMER_MODE_TIMER;
err_code = nrf_drv_timer_init(&m_timer3, &timer_cfg, empty_timer_handler);
APP_ERROR_CHECK(err_code);
timer_start_addr = nrf_drv_timer_task_address_get(&m_timer3, NRF_TIMER_TASK_START);
timer_stop_addr = nrf_drv_timer_task_address_get(&m_timer3, NRF_TIMER_TASK_STOP);
err_code = nrf_drv_ppi_channel_alloc(&ppi_channel);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_assign(ppi_channel, gpiote_evt_addr, count_task_addr);
APP_ERROR_CHECK(err_code);
nrf_drv_ppi_channel_enable(ppi_channel);
err_code = nrf_drv_ppi_channel_alloc(&ppi_channel);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_assign(ppi_channel, timer_evt0_addr, timer_start_addr);
APP_ERROR_CHECK(err_code);
nrf_drv_ppi_channel_enable(ppi_channel);
err_code = nrf_drv_ppi_channel_alloc(&ppi_channel);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_assign(ppi_channel, timer_evt1_addr, timer_stop_addr);
APP_ERROR_CHECK(err_code);
nrf_drv_ppi_channel_enable(ppi_channel);
}
static void ppi_init(void)
{
uint32_t err_code = nrf_drv_ppi_init();
APP_ERROR_CHECK(err_code);
}
static void gpiote_init(void)
{
uint32_t err_code = nrf_drv_gpiote_init();
APP_ERROR_CHECK(err_code);
}
static void signal_input_sample(void)
{
if (!m_sample_pending)
{
nrf_drv_gpiote_in_event_enable(SIG_INPUT_PIN, false);
m_sample_pending = true;
}
}
/**
* @brief Function for application main entry.
*/
void main(void)
{
hf_clock_start();
log_init();
ppi_init();
gpiote_init();
signal_generator_start();
signal_input_sampling_init();
while (true)
{
if (NRF_LOG_PROCESS() == false)
{
//__WFE();
signal_input_sample();
nrf_delay_ms(1000);
}
}
}
/** @} */
Hi Vidar, Thanks for your reply and appreciate.
I tried this code but not able to see any results on the com port.
can you please help me to het it work.
Hi,
Did you verify that you are feeding the input signal into the correct pin (SIG_INPUT_PIN)? You can also connect SIG_INPUT_PIN to SIG_OUT_PIN externally to measure the frequency of the generated output signal.
I want to make an addition that I will measure 3 inputs on gpios. I was trying to test for 1, so that I will follow the same steps to implement for 3, but still trying to make it work for single. Thanks
I recommend you start with one input first to see if you can get it to work. You will not be able to sample a high-frequency input continuously or multiple inputs simultaneously anyway.
I recommend you start with one input first to see if you can get it to work. You will not be able to sample a high-frequency input continuously or multiple inputs simultaneously anyway.
yes im trying to make it work for 1 input on 1 gpio.
is it confirmed that I can't get a 3 frequencies on 3 different GPIO'S ???