RE: How to enable HFCLK in ZephyrOS (nRF Connect SDK 1.9)

Elfving — Fri, 22 Apr 2022 13:31:44 GMT

Hello, and thanks for your patience on this issue during the Easter Holiday.

Unfortunately I don't have many suggestions for how to get this to work. This is a hacky solution for something that shouldn't really be possible. For questions about it, please ask on github.

Regards,

Elfving

RE: How to enable HFCLK in ZephyrOS (nRF Connect SDK 1.9)

ozanoner — Fri, 08 Apr 2022 21:41:14 GMT

Thanks for the link, Elfving. It sounds very promising but unfortunately I couldn't run my test app successfully. In my test app, I tried to add a simple k_timer and a periodic timeout handler in which led0 toggles.

The prj.conf file sets the config as in the link you've shared. (actually there is another one for nrf52840 here: github.com/.../28469

CONFIG_NRF_RTC_TIMER=n
CONFIG_CORTEX_M_SYSTICK=y
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=64000000
CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000000

And main.c:

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

static struct gpio_dt_spec led = GPIO_DT_SPEC_GET_OR(DT_ALIAS(led0), gpios,
													 {0});

void my_timer_handler(struct k_timer *dummy)
{
	gpio_pin_toggle(led.port, led.pin);
}

K_TIMER_DEFINE(my_timer, my_timer_handler, NULL);

void main(void)
{
	int ret = 0;
	if (led.port && !device_is_ready(led.port))
	{
		printk("Error %d: LED device %s is not ready; ignoring it\n",
			   ret, led.port->name);
		led.port = NULL;
	}
	if (led.port)
	{
		ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT);
		if (ret != 0)
		{
			printk("Error %d: failed to configure LED device %s pin %d\n",
				   ret, led.port->name, led.pin);
			led.port = NULL;
		}
		else
		{
			printk("Set up LED at %s pin %d\n", led.port->name, led.pin);
		}
	}

	k_timer_start(&my_timer, K_SECONDS(1), K_SECONDS(1));
}

I see the led0 initialization is done on the serial output but I can't see led0 blinks.

When I comment out all prf.conf lines, which means when RTC is active as the clock source, the app starts to work as expected, ie led0 blinks. So apparently I'm missing something.

In another application, I tested k_msleep(1) and this doesn't work either. The app never passes the sleep line, which suggests the underlying timer doesn't work.

Any suggestion about how I can correct the configuration? Or anything else that can help with that?

Many thanks,

Ozan

RE: How to enable HFCLK in ZephyrOS (nRF Connect SDK 1.9)

Elfving — Fri, 08 Apr 2022 16:07:02 GMT

Hello Vedat,

Unfortunately, I don't think so. Though there was a bit of a hacky solution discussed here that might deserve a look.

Regards,

Elfving