How to modify the low-speed crystal oscillator type and power supply mode in the code？

[Август]

NCS2.7.0

board：nrf54L15

We need a hardware to equip the nrf54l15 hardware, such as using internal or external low-speed crystal, power supply method is DCDC or LDO, etc.

Just like the old SDK, you can modify these in the code, but ncs can change it in the configuration file.

eg：

1. burn param to uicr

2. read uicr param 

3. code set param（xtal rc or dcdc ldo）

 

 change dcdc or ldo

old SDK

sd_power_dcdc_mode_set （NRF_POWER_DCDC_ENABLE ）

change xtal or rc

old SDK

I can modify clock_lf_cfg to decide whether to use internal or external crystal.

sd_softdevice_enable （＆clock_lf_cfg，app_error_fault_handler）；

I found that ncs uses clock control, but I don't know how to change it. Please give me some suggestions.

I tried restarting the clock this way but I don't know if it's possible.

[Einar Thorsrud]

Hi,

Please update the question to English (See point 4 in Nordic DevZone Terms of Service).

[Август]

I am sorry, it changed to English.

[Einar Thorsrud]

Hi,

To use LFRC instead of LFXO use this in your Kconfig (for instance in prj.conf or in a board configuratin file if you have that for your custom board):

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y

(The DK borad files will use crystal by default, by setting CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=y)

To use DCDC, include BOARD_ENABLE_DCDC=y in the configuration when using nRF Connect SDK 2.7.0 or earlier. Also use the following for nRF54L (and other boards in main or SDK 2.8.0 or later):

&vregmain {
	status = "okay";
	regulator-initial-mode = <NRF5X_REG_MODE_DCDC>;
};

(If using LDO use NRF5X_REG_MODE_LDO instead of  NRF5X_REG_MODE_DCDC).

[Август]

Hi,

   Thanks for your quick response. 

   I need an interface to modify the low speed crystal type.

   Because our project one firmware is needed for multiple hardware.

  eg：

void main (void)
{
    /* dcdc */
    uint8_t dcdc_type = 0;
    dcdc_type = read_dcdc_type_from_flash(); /* just a example */
    NRF_REGULATORS->VREGMAIN.DCDCEN = dcdc_type;
    
    /* xtal or rc(ppm) */
    
}

[Август]

One firmware for multiple hardware
For example, a hardware with an external low-speed crystal oscillator and dcdc
a hardware with an external low-speed crystal oscillator and ldo
a hardware without an external low-speed crystal oscillator and dcdc
a hardware without an external low-speed crystal oscillator and ldo