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mcu/nrf51: Fix low frequency clock selection #3161

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merged 1 commit into from
Mar 8, 2024
Merged

mcu/nrf51: Fix low frequency clock selection #3161

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18 changes: 7 additions & 11 deletions hw/mcu/nordic/nrf51xxx/src/hal_system.c
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Original file line number Diff line number Diff line change
Expand Up @@ -69,32 +69,28 @@ hal_debugger_connected(void)
void
hal_system_clock_start(void)
{
#if MYNEWT_VAL(XTAL_32768) || MYNEWT_VAL(XTAL_RC) || \
MYNEWT_VAL(XTAL_32768_SYNTH)
#if MYNEWT_VAL(MCU_LFCLK_SOURCE)
uint32_t regmsk;
uint32_t regval;
uint32_t clksrc;

regmsk = CLOCK_LFCLKSTAT_STATE_Msk | CLOCK_LFCLKSTAT_SRC_Msk;
regval = CLOCK_LFCLKSTAT_STATE_Running << CLOCK_LFCLKSTAT_STATE_Pos;

#if MYNEWT_VAL(XTAL_32768)
#if MYNEWT_VAL_CHOICE(MCU_LFCLK_SOURCE, LFXO)
regval |= CLOCK_LFCLKSTAT_SRC_Xtal << CLOCK_LFCLKSTAT_SRC_Pos;
clksrc = CLOCK_LFCLKSRC_SRC_Xtal;
#endif

#if MYNEWT_VAL(XTAL_32768_SYNTH)
#elif MYNEWT_VAL_CHOICE(MCU_LFCLK_SOURCE, LFSYNTH)
regval |= CLOCK_LFCLKSTAT_SRC_Synth << CLOCK_LFCLKSTAT_SRC_Pos;
clksrc = CLOCK_LFCLKSRC_SRC_Synth;
#endif

#if MYNEWT_VAL(XTAL_RC)
#elif MYNEWT_VAL_CHOICE(MCU_LFCLK_SOURCE, LFRC)
regval |= CLOCK_LFCLKSTAT_SRC_RC << CLOCK_LFCLKSTAT_SRC_Pos;
clksrc = CLOCK_LFCLKSRC_SRC_RC;
#else
#error Unknown LFCLK source selected
#endif


#if MYNEWT_VAL(XTAL_32768_SYNTH)
#if MYNEWT_VAL_CHOICE(MCU_LFCLK_SOURCE, LFSYNTH)
/* Must turn on HFLCK for synthesized 32768 crystal */
if ((NRF_CLOCK->HFCLKSTAT & CLOCK_HFCLKSTAT_STATE_Msk) !=
(CLOCK_HFCLKSTAT_STATE_Running << CLOCK_HFCLKSTAT_STATE_Pos)) {
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