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select 32MHz crystal if configured to do so #23

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select 32MHz crystal if configured to do so #23

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5 changes: 5 additions & 0 deletions source/nordic_sdk/components/toolchain/system_nrf51.c
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,11 @@ void SystemCoreClockUpdate(void)

void SystemInit(void)
{
#ifdef YOTTA_CFG_HARDWARE_CLOCKS_NRF_HFCLK_32MHZ
/* It's possible to use a 32MHz HF crystal */
NRF_CLOCK->XTALFREQ = (uint32_t)((CLOCK_XTALFREQ_XTALFREQ_32MHz << CLOCK_XTALFREQ_XTALFREQ_Pos) & CLOCK_XTALFREQ_XTALFREQ_Msk);
#endif

/* If desired, switch off the unused RAM to lower consumption by the use of RAMON register.
It can also be done in the application main() function. */

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