nRF51822 use without external oscillator

[MaxRPEng]

Hello,

i found a few articels about it but none of them where helpfull for me.

I just want to use my nRF51822 Module from Raytac without an external 32khz oszillator.
I tried a few examples without success.

I use SDK 12.3, my application is build up from the ble_app_template.

Is there any good documentation about that? I just want a solution to change my code to get it running without an external quarz.

Thanks a lot

Best regards

Max

[bjorn-spockeli]

HI Max, 

you need to set the NRF_CLOCK_LFCLKSRC configuration , defined in pca10028.h, to use the NRF_CLOCK_LF_SRC_RC and not the NRF_CLOCK_LF_SRC_XTAL, i.e 

#define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_RC, \
.rc_ctiv = 16 \
.rc_temp_ctiv = 2, \
.xtal_accuracy = 0}

Best regards
Bjørn

[MaxRPEng]

Hello,

it works well, thank you so much.
by the way where can i find informations like these? it is for a nrf beginner not easy to get started whith basics like that.

[drutis]

can it be used without 16mhz external oscillator too ?

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