Is the "NRF_POWER->DCDCEN" equal to to "sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE)" ?

[zqclzz]

Hi, Nordic:

I'm testing the DC/DC function as to reduce the radio current. I have done the DC/DC test using pca10028 DK with the code below (SD v2.0.1, SDK11) :

void main(void)

{

 NRF_POWER->DCDCEN = 1;

//NRF_RADIO->TASKS_TXEN = 1;

 NRF_RADIO->TASKS_RXEN = 1;

 NRF_RADIO->TASKS_START = 1;

 while(1);

}

When using "NRF_POWER->DCDCEN = 1" the radio current does reduce to about 14ma, not using "NRF_POWER->DCDCEN = 1" the radio current is about 17ma.

But using "sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE)" instead of "NRF_POWER->DCDCEN = 1", the radio current has no improvement, still keeping about 17ma.

which one should I use in my code to enable the DC/DC function, "NRF_POWER->DCDCEN = 1" or "sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE)" ?

If using "sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE)" , where should I place the code, before ble_stack_init() or behind ble_stack_init()?

Thanks,

Try

[Stefan Birnir Sverrisson]

Hi

Functions starting with sd_* are calls to softdevice wrapper and should be used only after you enable the softdevice. If you enable the dcdc before enabling the softdevice, use NRF_POWER->DCDCEN = 1. I find it good practice to enable the DCDC at the start of the code before initializing the softdevice with NRF_POWER->DCDCEN = 1. More dcdc info is on this thread.