Repeatitive Timer and Edge Counter in nRF5340

[mexco]

I need repetitive Timer and Edge Counter in my application. There is is a single Timer Peripheral that can be used either as a Timer or Counter.  As well, further in counter mode, it is required to count both edges pe second. SO, how can all these be achieved ?

[Sigurd]

Hi,

I believe I have some code here that does what you describe:

https://github.com/sigurdnev/ncs-playground/blob/master/samples/pulse_detector/src/main.c

[mexco]

I copied some code from the link of example given by you as in attached text file. When, build the error shown in image occurs.

Gulzar Singh

  

Fullscreen tmr.txt Download

//*******
#include <nrfx_timer.h>
#include <nrfx_gpiote.h>
#include <helpers/nrfx_gppi.h>
#if defined(DPPI_PRESENT)
#include <nrfx_dppi.h>
#else
#include <nrfx_ppi.h>
#endif
//***********
#define INPUT_PIN 26
#define COUNT_READ_INTERVAL 2000
static const nrfx_timer_t m_timer_count = NRFX_TIMER_INSTANCE(0);

static const nrfx_timer_t m_timer_read  = NRFX_TIMER_INSTANCE(1);
//******************************************************************************************
void timer_handler_count(nrf_timer_event_t event_type, void * p_context)
{

}

void timer_handler_read(nrf_timer_event_t event_type, void * p_context)
{
    uint32_t count = nrfx_timer_capture_get(&m_timer_count, NRF_TIMER_CC_CHANNEL0);
	uint32_t avg_freq = 0;
    if(count > 0)
    {
	   avg_freq = (1000*count)/COUNT_READ_INTERVAL;
	   printk("Average freq: %d [Hz]\n",avg_freq);
    }
	printk("C: %d\n",count);
}
/**
 * @brief Function for configuring: INPUT_PIN pin for input sensing
 */
static void gpiote_init(void)
{
    nrfx_err_t err;
	
	/* Connect GPIOTE_0 IRQ to nrfx_gpiote_irq_handler */
	//IRQ_CONNECT(DT_IRQN(DT_NODELABEL(gpiote)),
	//	    DT_IRQ(DT_NODELABEL(gpiote), priority),
	//	    nrfx_isr, nrfx_gpiote_irq_handler, 0);
			
	/* Initialize GPIOTE (the interrupt priority passed as the parameter
	 * here is ignored, see nrfx_glue.h).
	 */
	err = nrfx_gpiote_init(0);
	if (err != NRFX_SUCCESS) {
		printk("nrfx_gpiote_init error: %08x", err);
		return;
	}
	
	nrfx_gpiote_in_config_t const in_config = {
		.sense = NRF_GPIOTE_POLARITY_LOTOHI,
		.pull = NRF_GPIO_PIN_NOPULL,
		.is_watcher = false,
		.hi_accuracy = true,
		.skip_gpio_setup = false,
	};

	err = nrfx_gpiote_in_init(INPUT_PIN, &in_config, NULL);
	if (err != NRFX_SUCCESS) {
		printk("nrfx_gpiote_in_init error: %08x", err);
		return;
	}
	
	nrfx_gpiote_in_event_enable(INPUT_PIN, false);
	

}
static void timer_init(void)
{
	// Configure m_timer_count for counting of low to high events on GPIO
	nrfx_err_t          err;
	nrfx_timer_config_t timer_cfg = {
		.mode      = NRF_TIMER_MODE_LOW_POWER_COUNTER,
		.bit_width = NRF_TIMER_BIT_WIDTH_32,
		.p_context = NULL,
	};

	err = nrfx_timer_init(&m_timer_count, &timer_cfg, timer_handler_count);
	if (err != NRFX_SUCCESS) {
		printk("nrfx_timer_init failed with: %d\n", err);
	}
	// Configure m_timer_read for reading the counter timer at a given interval COUNT_READ_INTERVAL
    timer_cfg.mode = NRF_TIMER_MODE_TIMER;
    err = nrfx_timer_init(&m_timer_read, &timer_cfg, timer_handler_read);
    if (err != NRFX_SUCCESS) {
		printk("nrfx_timer_init failed with: %d\n", err);
	}
		
	nrfx_timer_extended_compare(&m_timer_read,
		NRF_TIMER_CC_CHANNEL0,
		nrfx_timer_ms_to_ticks(&m_timer_read, COUNT_READ_INTERVAL),
		NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
		true);
	
	
	IRQ_CONNECT(TIMER1_IRQn, NRFX_TIMER_DEFAULT_CONFIG_IRQ_PRIORITY,
		nrfx_timer_1_irq_handler, NULL, 0);
	IRQ_CONNECT(TIMER2_IRQn, NRFX_TIMER_DEFAULT_CONFIG_IRQ_PRIORITY,
		nrfx_timer_2_irq_handler, NULL, 0);
	
	nrfx_timer_clear(&m_timer_count);
	nrfx_timer_clear(&m_timer_read);
	
	nrfx_timer_enable(&m_timer_count);
	nrfx_timer_enable(&m_timer_read);
		
}
void ppi_init()
{
    nrfx_err_t err;
	
	/* Allocate a (D)PPI channel. */
#if defined(DPPI_PRESENT)
	uint8_t ppi_channel_1;
	uint8_t ppi_channel_2;
	
	err = nrfx_dppi_channel_alloc(&ppi_channel_1);
	err = nrfx_dppi_channel_alloc(&ppi_channel_2);
#else
	nrf_ppi_channel_t ppi_channel_1;
    nrf_ppi_channel_t ppi_channel_2;
	
	err = nrfx_ppi_channel_alloc(&ppi_channel_1);
	err = nrfx_ppi_channel_alloc(&ppi_channel_2);
#endif
	if (err != NRFX_SUCCESS) {
		printk("(D)PPI channel allocation error: %08x", err);
		return;
	}

	
	nrfx_gppi_channel_endpoints_setup(ppi_channel_1,
		nrf_gpiote_event_address_get(NRF_GPIOTE,
			nrfx_gpiote_in_event_get(INPUT_PIN)),
		nrf_timer_task_address_get(m_timer_count.p_reg,
			NRF_TIMER_TASK_COUNT));
			

	nrfx_gppi_channel_endpoints_setup(ppi_channel_2,
		nrf_timer_event_address_get(m_timer_read.p_reg,
			NRF_TIMER_EVENT_COMPARE0),
        nrf_timer_task_address_get(m_timer_count.p_reg, 
			NRF_TIMER_TASK_CAPTURE0));
	
	
    nrfx_gppi_fork_endpoint_setup(ppi_channel_2, nrf_timer_task_address_get(m_timer_count.p_reg,NRF_TIMER_TASK_CLEAR)); // Clear counter timer using (D)PPI.
 
	/* Enable (D)PPI channel. */
#if defined(DPPI_PRESENT)
	err = nrfx_dppi_channel_enable(ppi_channel_1);
	err = nrfx_dppi_channel_enable(ppi_channel_2);
#else
	err = nrfx_ppi_channel_enable(ppi_channel_1);
	err = nrfx_ppi_channel_enable(ppi_channel_2);
#endif
	if (err != NRFX_SUCCESS) {
		printk("Failed to enable (D)PPI channel, error: %08x", err);
		return;
	}
}
//************
void main()
{
	 gpiote_init();
	
        timer_init();
	
        ppi_init();
}

[Sigurd]

Try these timer instances instead:

static const nrfx_timer_t m_timer_count = NRFX_TIMER_INSTANCE(2);

static const nrfx_timer_t m_timer_read  = NRFX_TIMER_INSTANCE(3);

And set this in prj.conf

CONFIG_NRFX_TIMER2=y
CONFIG_NRFX_TIMER3=y