nrf9160 DK thread not running

RE: nrf9160 DK thread not running

Martin Lesund — Fri, 06 Mar 2020 10:36:04 GMT

Hi Praveen,

Yes, there is.

Please use this Synchronization sample as a reference on how you can make Threads and how you can synchronize.

I've made a version based on the said sample that achieves what you are trying to do:

/* main.c - Hello World demo */

/*
 * Copyright (c) 2012-2014 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr.h>
#include <sys/printk.h>
#include <device.h>
#include <drivers/gpio.h>

/*
 * The hello world demo has two threads that utilize semaphores and sleeping
 * to take turns printing a greeting message at a controlled rate. The demo
 * shows both the static and dynamic approaches for spawning a thread; a real
 * world application would likely use the static approach for both threads.
 */


/* Change this if you have an LED connected to a custom port */
#ifndef DT_ALIAS_LED0_GPIOS_CONTROLLER
#define DT_ALIAS_LED0_GPIOS_CONTROLLER 	LED0_GPIO_PORT
#endif
#ifndef DT_ALIAS_LED1_GPIOS_CONTROLLER
#define DT_ALIAS_LED1_GPIOS_CONTROLLER 	LED1_GPIO_PORT
#endif


#define PORT0	 DT_ALIAS_LED0_GPIOS_CONTROLLER
#define PORT1	 DT_ALIAS_LED1_GPIOS_CONTROLLER


/* Change this if you have an LED connected to a custom pin */
#define LED0    DT_ALIAS_LED0_GPIOS_PIN
#define LED1    DT_ALIAS_LED1_GPIOS_PIN


/* size of stack area used by each thread */
#define STACKSIZE 1024

/* scheduling priority used by each thread */
#define PRIORITY 7

/* delay between greetings (in ms) */
#define SLEEPTIME 500


void blink(const char *port, u32_t sleep_ms, u32_t led, u32_t id)
{
	int cnt = 0;
	struct device *gpio_dev;

	gpio_dev = device_get_binding(port);
	__ASSERT_NO_MSG(gpio_dev != NULL);
	gpio_pin_configure(gpio_dev, led, GPIO_DIR_OUT);

	while (1) {
		gpio_pin_write(gpio_dev, led, cnt % 2);
		k_sleep(sleep_ms);
		cnt++;
	}
}


void blink1(void)
{
	blink(PORT0, 400, LED0, 0);
}

void blink2(void)
{
	k_sleep(400);
	blink(PORT1, 400, LED1, 1);
}


/*
 * @param my_name      thread identification string
 * @param my_sem       thread's own semaphore
 * @param other_sem    other thread's semaphore
 */
void helloLoop(const char *my_name,
	       struct k_sem *my_sem, struct k_sem *other_sem)
{
	const char *tname;

	while (1) {
		/* take my semaphore */
		k_sem_take(my_sem, K_FOREVER);

		/* say "hello" */
		tname = k_thread_name_get(k_current_get());
		if (tname == NULL) {
			printk("%s: Hello World from %s!\n",
				my_name, CONFIG_BOARD);
		} else {
			printk("%s: Hello World from %s!\n",
				tname, CONFIG_BOARD);
		}

		/* wait a while, then let other thread have a turn */
		k_sleep(SLEEPTIME);
		k_sem_give(other_sem);
	}
}

/* define semaphores */

K_SEM_DEFINE(threadA_sem, 1, 1);	/* starts off "available" */
K_SEM_DEFINE(threadB_sem, 0, 1);	/* starts off "not available" */


/* threadB is a dynamic thread that is spawned by threadA */

void threadB(void *dummy1, void *dummy2, void *dummy3)
{
	ARG_UNUSED(dummy1);
	ARG_UNUSED(dummy2);
	ARG_UNUSED(dummy3);
	blink1();
	/* invoke routine to ping-pong hello messages with threadA */
	helloLoop(__func__, &threadB_sem, &threadA_sem);
}

K_THREAD_STACK_DEFINE(threadB_stack_area, STACKSIZE);
static struct k_thread threadB_data;

/* threadA is a static thread that is spawned automatically */

void threadA(void *dummy1, void *dummy2, void *dummy3)
{
	ARG_UNUSED(dummy1);
	ARG_UNUSED(dummy2);
	ARG_UNUSED(dummy3);

	/* spawn threadB */
	k_tid_t tid = k_thread_create(&threadB_data, threadB_stack_area,
			STACKSIZE, threadB, NULL, NULL, NULL,
			PRIORITY, 0, K_NO_WAIT);
	blink2();
	k_thread_name_set(tid, "thread_b");

	/* invoke routine to ping-pong hello messages with threadB */
	helloLoop(__func__, &threadA_sem, &threadB_sem);
}

K_THREAD_DEFINE(thread_a, STACKSIZE, threadA, NULL, NULL, NULL,
		PRIORITY, 0, K_NO_WAIT);

RE: nrf9160 DK thread not running

praveenpalaparthi — Fri, 06 Mar 2020 09:25:40 GMT

Hi Martin,

Anything wrong in my example code?

Please suggest me

regards,

Praveen Palaparthi

RE: nrf9160 DK thread not running

Martin Lesund — Wed, 04 Mar 2020 12:35:22 GMT

Hi Praveen,
Please check the documentation for how to "Spawn a Thread".
There you see that the thread is created outside the main() function.

Here is a suggestion on how you could set up your main() function.

RE: nrf9160 DK thread not running

praveenpalaparthi — Wed, 04 Mar 2020 10:08:27 GMT

Hi Martin,

Thank you very much for your response.

If I create thread in run time by using K_THREAD_DEFINE I am able to turn ON led's alternatively.

I am not able to create thread if I create in main() thread \ function as done in my code example by calling k_thread_create() function.

In my application, we will have one main() function in which we do initialization and create task/threads and one infinite loop as shown below.

void main(void)

{

……

…..

initialization of peripherals();

…...

…..

create task/threads1

create task/threads2

create task/threads3

while(1);

}

My question is cant we create a thread in void main (void) function? If yes how to create thread?

RE: nrf9160 DK thread not running

Martin Lesund — Wed, 04 Mar 2020 09:29:15 GMT

Hi Praveen,

There is a generic sample [Basic Thread Example] on how you can achieve exactly this in the zephyr repo.

If you change the sleep interval in Blink1 and Blink2 to match:

e.g.

void blink1(void)
{
	blink(PORT0, 400, LED0, 0);
}

void blink2(void)
{
	blink(PORT1, 400, LED1, 1);
}

and change the initialization of one of the Threads to have the same delay so the LEDs can alternate.

e.g.

K_THREAD_DEFINE(blink1_id, STACKSIZE, blink1, NULL, NULL, NULL,
		PRIORITY, 0, 400);

Please check out the documentation for Threads and Scheduling for more details and information on how to use this.

Best regards,
Martin L.