Why can't I stop this timer

RE: Why can't I stop this timer

duxinglang — Wed, 26 May 2021 03:05:11 GMT

Hi,thanks for you reply! I will look at the documents.

I have tried to perform these tasks in a workqueue, but the fact is that must be finished before a task processing will be the next mission, in many cases, our application needs to start at the same time, for example when connected to the network to send data, also will be required to open the GPS, in order to avoid this kind of waiting, so I didn't set up three job queue.

RE: Why can't I stop this timer

Didrik Rokhaug — Tue, 25 May 2021 14:21:13 GMT

Hi, and sorry for the late answer.

Why do you need three workqueues? In most cases, one should be enough (just make sure you avoid deadlocks by having one task wait for another).

As for how to send messages between threads, I recommend you read through Zephyr's documentation about the different kernel services: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/reference/kernel/index.html#

There you will find different solutions ranging from simple semaphores, to more complex solutions such as message queues, mailboxess and pipes.

RE: Why can't I stop this timer

duxinglang — Fri, 21 May 2021 02:15:38 GMT

Thanks for your help, I found that it seems to be the problem caused by multiple threads, actually in a single thread, the timer works correctly. So, this raises the question of how do I pass messages between different threads? I have three work queues started in my current application, and I find that in addition to interruptions, I often have problems transferring messages between them.

RE: Why can't I stop this timer

Didrik Rokhaug — Fri, 14 May 2021 14:58:42 GMT

Hi,

This code works for me, using NCS v1.5.0:

#include <zephyr.h>
#include <kernel.h>

void timer_handler(struct k_timer *timer) {
	printk("Timer handler\n");
}

K_TIMER_DEFINE(my_timer, timer_handler, NULL);

void main(void)
{
	printk("Timer stop test\n");
	printk("Starting timer\n");
	k_timer_start(&my_timer, K_MSEC(300), K_NO_WAIT);
	printk("Stopping timer\n");
	k_timer_stop(&my_timer);
	printk("Timer stopped\n");
}

Are you sure k_timer_stop() is called, or that the timer hasn't been restarted?

Best regards,

Didrik