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lf clock config prove of concept

pull/2234/head
Andrzej Puzdrowski 2016-07-19 09:37:42 +02:00
parent 9745eff74c
commit d99843745b
1 changed files with 25 additions and 1 deletions
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26
hal/targets/cmsis/TARGET_NORDIC/TARGET_NRF5/TARGET_MCU_NRF51822/system_nrf51.c
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@ -104,8 +104,32 @@ void SystemInit(void)
*(uint32_t volatile *)0x4006EC14 = 0xC0;
}
#define NRF_LF_SRC_XTAL 2
#define NRF_LF_SRC_SYNTH 3
#define NRF_LF_SRC_RC 4
//MBED_CONF_APP_NORDIC_NRF_LF_CLOCK_SRC
#if MBED_CONF_APP_NORDIC_NRF_LF_CLOCK_SRC == NRF_LF_SRC_SYNTH
#define CLOCK_LFCLKSRC_SRC_TO_USE (CLOCK_LFCLKSRC_SRC_Synth)
#warning synhetic clock
#elif MBED_CONF_APP_NORDIC_NRF_LF_CLOCK_SRC == NRF_LF_SRC_XTAL
#define CLOCK_LFCLKSRC_SRC_TO_USE (CLOCK_LFCLKSRC_SRC_Xtal)
#warning crystal clock
#elif MBED_CONF_APP_NORDIC_NRF_LF_CLOCK_SRC == NRF_LF_SRC_RC // and undefined
#define CLOCK_LFCLKSRC_SRC_TO_USE (CLOCK_LFCLKSRC_SRC_RC)
#warning RC clock
#else
#error Bad LFCLK configuration. Declare proper source through mbed configuration.
#endif
#undef NRF_LF_SRC_XTAL
#undef NRF_LF_SRC_SYNTH
#undef NRF_LF_SRC_RC
// Start the external 32khz crystal oscillator.
NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
//NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_TO_USE << CLOCK_LFCLKSRC_SRC_Pos);
NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
NRF_CLOCK->TASKS_LFCLKSTART = 1;