Possibility to read the current timer value

RE: Possibility to read the current timer value

dacr — Thu, 17 Oct 2024 10:04:05 GMT

I will relay your feedback to the relevant teams.

RE: Possibility to read the current timer value

mthomas — Thu, 17 Oct 2024 10:02:21 GMT

Thanks for the reply

It would be nice to consider adding this in future releases

RE: Possibility to read the current timer value

dacr — Thu, 17 Oct 2024 09:35:47 GMT

Hi,

There is no possibility to read the current value of the timer. You can only know when the timer expires.

All the best,

Dan

RE: Possibility to read the current timer value

mthomas — Wed, 16 Oct 2024 13:37:59 GMT

Hi, I've already tried to read that register.

The value does not change while the timer is running (at least in General Purpose mode) :

npmx_timer_t *timer = npmx_timer_get(&m_npmx, 0);
const npmx_timer_config_t timer_cfg = {
    .prescaler = NPMX_TIMER_PRESCALER_SLOW,
    .mode = NPMX_TIMER_MODE_GENERAL_PURPOSE,
    .compare_value = 0xFFFFFF,
};
npmx_timer_config_set(timer, &timer_cfg);
npmx_timer_task_trigger(timer, NPMX_TIMER_TASK_ENABLE);

nrf_delay_ms(100);

uint8_t timer_buffer[3] = {0};
npmx_backend_register_read(m_npmx.p_backend, NPMX_REG_TO_ADDR(NPM_TIMER->TIMERHIBYTE), timer_buffer, 3);

uint32_t timer_value = (
    (timer_buffer[0] << 16) |
    (timer_buffer[1] <<  8) |
    (timer_buffer[2] <<  0)
);
NRF_LOG_INFO("Timer value: 0x%x", timer_value);

Output is: Timer value: 0xFFFFFF

RE: Possibility to read the current timer value

helsing — Wed, 16 Oct 2024 12:31:07 GMT

Edit: Sorry, no, this is not possible :) See comment from Dan.
Yes, you can read the current value of the nPM1300 timer by accessing the TIMERHIBYTE, TIMERMIDBYTE, and TIMERLOBYTE registers. These registers represent the most significant byte, middle byte, and least significant byte of the timer respectively.

TIMERHIBYTE: Address offset 0x8
TIMERMIDBYTE: Address offset 0x9
TIMERLOBYTE: Address offset 0xA

You will find more details on TIMER in the nPM1300 documentation:
https://docs.nordicsemi.com/bundle/ps_npm1300/page/chapters/core_components/timer/doc/frontpage.html