nRF52840 custom board k_sleep()

RE: nRF52840 custom board k_sleep()

qwertynoon — Mon, 18 Apr 2022 07:29:42 GMT

If you don't have 32kHz

#CLOCK_CONTROL
CONFIG_CLOCK_CONTROL=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n

on board then that makes a difference. Add the following lines to config

RE: nRF52840 custom board k_sleep()

zic123 — Sun, 17 Apr 2022 22:06:32 GMT

Thank you for providing the code.
I have tested it but I get the same result.

Do you maybe have any other tips?
I would like to add that the board only has a 32Mhz external oscillator and not an additional 32.768 kHz oscillator, which I see is optional, as it can use an HF clock for the LF clock. Is this maybe the problem? I just do not know if I should change something in .dts files or somewhere else.

Could you provide additional comment on why this k_sleep() "Arduino only way", as I see it being used in multiple examples and on boards that are not from Arduino, like nrf52840 DK?

Thank you in advance.

RE: nRF52840 custom board k_sleep()

qwertynoon — Wed, 13 Apr 2022 17:40:58 GMT

Hi!!!

Actually this way you go is for Arduino only.

Zephyr is RTOS - cool system.

Please try to use Zephyrs timers and use next code

void FLASH_handler()
{
    //do something every 1000ms
}

K_WORK_DEFINE(FLASH_timer_work, FLASH_handler);

void FLASH_timer_handler(struct k_timer *dummy)
{
    k_work_submit(&FLASH_timer_work);
}

K_TIMER_DEFINE(k_FLASH_timer, FLASH_timer_handler, NULL);

void main()
{
    k_timer_start(&k_FLASH_timer,  K_MSEC(1000), K_MSEC(1000));
}