What is the minimum Timer interval for nRF52832

[enkavak]

Hello,

      I'm using nRF5 SDK with version 15 and nRF52832 IC. I want to sample some data with 3200Hz sampling rate. I can set the timer minimum 1ms Which means 1000Hz. How can I adjust the Timer for microSecond values.

Best Regards

[enkavak]

I can only share some parts of my code

void timer_led_event_handler(nrf_timer_event_t event_type, void* p_context)
{
    switch (event_type)
    {
        case NRF_TIMER_EVENT_COMPARE0:
        {
            nrf_gpio_pin_toggle(17);
        }
        break;

        default:
            //Do nothing.
            break;
    }
}


static void TimerInit1(void)
{

    nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
    err_code = nrf_drv_timer_init(&TIMER_LED, &timer_cfg, timer_led_event_handler);
    APP_ERROR_CHECK(err_code);
    time_ticks = nrf_drv_timer_ms_to_ticks(&TIMER_LED, time_ms);
    nrf_drv_timer_extended_compare(&TIMER_LED, NRF_TIMER_CC_CHANNEL0, time_ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
    nrf_drv_timer_enable(&TIMER_LED);
}

[AmbystomaLabs]

Are you using the soft device?

[enkavak]

Yes, I am using the SoftDevice.

[AmbystomaLabs]

Well no ISR approach will work for you anyway when using the SD.  As I pointed out above, you cannot do this with an ISR while using the SD. Please re-read my prior response.

Since you can only do it completely in hardware ie, ppi/gpiote there will not likely be an example specific to your needs.  Also, you will have to give a lot more information about the source and type of data for anyone to help.

[enkavak]

I want to sample some data with 3200Hz sampling rate from SPI interface. There is an accelerometer connected via SPI interface.

How do I need to configure the ppi ?