nrf_drv_clock_lfclk_request required by freeRTOS but is part of legacy drivers

[cp52]

SDK 15.2

port_cmsis_systick.c 

void vPortSetupTimerInterrupt( void )
{
    /* Request LF clock */
    nrf_drv_clock_lfclk_request(NULL);

    /* Configure SysTick to interrupt at the requested rate. */
    nrf_rtc_prescaler_set(portNRF_RTC_REG, portNRF_RTC_PRESCALER);
    nrf_rtc_int_enable   (portNRF_RTC_REG, RTC_INTENSET_TICK_Msk);
    nrf_rtc_task_trigger (portNRF_RTC_REG, NRF_RTC_TASK_CLEAR);
    nrf_rtc_task_trigger (portNRF_RTC_REG, NRF_RTC_TASK_START);
    nrf_rtc_event_enable(portNRF_RTC_REG, RTC_EVTEN_OVRFLW_Msk);

    NVIC_SetPriority(portNRF_RTC_IRQn, configKERNEL_INTERRUPT_PRIORITY);
    NVIC_EnableIRQ(portNRF_RTC_IRQn);
}

 nrf_drv_clock_lfclk_request is part of the legacy drivers that will eventually be removed? 

Does this mean for FreeRTOS I need to keep using the legacy clock driver?

Is this likely to change?

[cp52]

Also another problem with this:

nrf_drv_clock.c

#if NRF_MODULE_ENABLED(NRF_CLOCK)

Is this meant to be enabled via the sdk_config? 

How do I enable it?

[Marjeris Romero]

Hi Ceri,

The nrf_drv_clock_lfclk_request is actually used as a wrapper and if you take a look inside the function you will see it uses nrfx_clock_lfclk_start to start timers. This is not likely to change in the near future.

To enable the NRF_CLOCK module in sdk_config.h, just search for the following lines of code:

// <e> NRF_CLOCK_ENABLED - nrf_drv_clock - CLOCK peripheral driver - legacy layer
//==========================================================
#ifndef NRF_CLOCK_ENABLED
#define NRF_CLOCK_ENABLED 1
#endif

You will also need to enabled the NRFX_CLOCK module in the same way.

Best Regards,

Marjeris

[cp52]

My point is that NRF_CLOCK is a type defined in nrf52.h.....

#if NRF_MODULE_ENABLED(NRF_CLOCK) therefore wont work?

Shouldnt this be :

nrf_drv_clock.c

#if NRF_MODULE_ENABLED(NRF_CLOCK_ENABLE)

Or have I mistaken some other working of the system?

This is a change 15.0 -> 15.1

 -#if NRF_MODULE_ENABLED(CLOCK) - 15.0
+#if NRF_MODULE_ENABLED(NRF_CLOCK)  - 15.1

[cp52]

Also what is the current stance on the nrf_drv_clock? 

The migration document says that we can not migrate completely to nrfx_clock.

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/hardware_drivers.html

Main difference that I can see is the clock_init has been changed to take in a clock handler.

[Marjeris Romero]

Hi,

NRF_MODULE_ENABLED is define in nordic_common.h:

#define NRF_MODULE_ENABLED(module) \
    ((defined(module ## _ENABLED) && (module ## _ENABLED)) ? 1 : 0)
#endif

Regards,

Marjeris