/**
* @brief Initialize the system clock
*
* @return N/A
*
*/
static ALWAYS_INLINE void clkInit(void)
{
#ifdef CONFIG_CMU_HFCLK_HFXO
CMU_HFXOInit(&hfxoInit);
CMU_OscillatorEnable(cmuOsc_HFXO, true, true);
CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFXO);
CMU_OscillatorEnable(cmuOsc_HFRCO, false, false);
SystemHFXOClockSet(CONFIG_CMU_HFXO_FREQ);
#elif (defined CONFIG_CMU_HFCLK_LFXO)
CMU_LFXOInit(&lfxoInit);
CMU_OscillatorEnable(cmuOsc_LFXO, true, true);
CMU_ClockSelectSet(cmuClock_HF, cmuSelect_LFXO);
CMU_OscillatorEnable(cmuOsc_HFRCO, false, false);
SystemLFXOClockSet(CONFIG_CMU_LFXO_FREQ);
#elif (defined CONFIG_CMU_HFCLK_HFRCO)
/*
* This is the default clock, the controller starts with, so nothing to
* do here.
*/
#else
#error "Unsupported clock source for HFCLK selected"
#endif
/* Enable the High Frequency Peripheral Clock */
CMU_ClockEnable(cmuClock_HFPER, true);
#ifdef CONFIG_GPIO_GECKO
CMU_ClockEnable(cmuClock_GPIO, true);
#endif
}
//================================================================================
// HFXO_enter_DefaultMode_from_RESET
//================================================================================
extern void HFXO_enter_DefaultMode_from_RESET(void) {
// $[HFXO]
CMU->CTRL = (CMU->CTRL & ~_CMU_CTRL_HFXOMODE_MASK) | CMU_CTRL_HFXOMODE_XTAL;
CMU->CTRL = (CMU->CTRL & ~_CMU_CTRL_HFXOBOOST_MASK)
| CMU_CTRL_HFXOBOOST_50PCENT;
SystemHFXOClockSet(32000000);
// [HFXO]$
}
/***************************************************************************//**
* @brief
* Initialize the board.
*
* @details
*
* @note
*
******************************************************************************/
void rt_hw_board_init(void)
{
/* Chip errata */
CHIP_Init();
/* NVIC Configuration */
NVIC_Configuration();
/* Configure external oscillator */
SystemHFXOClockSet(EFM32_HFXO_FREQUENCY);
setupSWO();
/* Configure the SysTick */
SysTick_Configuration();
rt_hw_driver_init();
}
//================================================================================
// CMU_enter_DefaultMode_from_RESET
//================================================================================
extern void CMU_enter_DefaultMode_from_RESET(void) {
// $[High Frequency Clock Setup]
/* Initializing HFXO */
CMU_HFXOInit_TypeDef hfxoInit = CMU_HFXOINIT_DEFAULT;
CMU_HFXOInit(&hfxoInit);
/* Setting system HFXO frequency */
SystemHFXOClockSet(38400000);
/* Enable HFXO oscillator, and wait for it to be stable */
CMU_OscillatorEnable(cmuOsc_HFXO, true, true);
/* Skipping HFXO oscillator select, as it is auto-enabled and selected on EM0/EM1
* entry */
/* Set autostart behaviour */
CMU_HFXOAutostartEnable(0, true, true);
/* HFRCO not needed when using HFXO */
CMU_OscillatorEnable(cmuOsc_HFRCO, false, false);
// [High Frequency Clock Setup]$
// $[LE clocks enable]
/* Enable clock to LE modules */
CMU_ClockEnable(cmuClock_CORELE, true);
/* Initializing LFXO */
CMU_LFXOInit_TypeDef lfxoInit = CMU_LFXOINIT_DEFAULT;
lfxoInit.ctune = 32;
CMU_LFXOInit(&lfxoInit);
/* Enable LFXO oscillator, and wait for it to be stable */
CMU_OscillatorEnable(cmuOsc_LFXO, true, true);
/* Setting system LFXO frequency */
SystemLFXOClockSet(32768);
// [LE clocks enable]$
// $[LFACLK Setup]
/* Select LFXO as clock source for LFACLK */
CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFXO);
// [LFACLK Setup]$
// $[LFBCLK Setup]
/* Select LFXO as clock source for LFBCLK */
CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFXO);
// [LFBCLK Setup]$
// $[LFECLK Setup]
/* Select LFXO as clock source for LFECLK */
CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFXO);
// [LFECLK Setup]$
// $[Peripheral Clock enables]
/* Enable clock for HF peripherals */
CMU_ClockEnable(cmuClock_HFPER, true);
/* Enable clock for ADC0 */
CMU_ClockEnable(cmuClock_ADC0, true);
/* Enable clock for GPCRC */
CMU_ClockEnable(cmuClock_GPCRC, true);
/* Enable clock for LDMA */
CMU_ClockEnable(cmuClock_LDMA, true);
/* Enable clock for PRS */
CMU_ClockEnable(cmuClock_PRS, true);
/* Enable clock for RTCC */
CMU_ClockEnable(cmuClock_RTCC, true);
/* Enable clock for TIMER1 */
CMU_ClockEnable(cmuClock_TIMER1, true);
/* Enable clock for GPIO by default */
CMU_ClockEnable(cmuClock_GPIO, true);
// [Peripheral Clock enables]$
// $[Clock output]
/* Disable CLKOUT0 output */
CMU->CTRL = (CMU->CTRL & ~_CMU_CTRL_CLKOUTSEL0_MASK)
| CMU_CTRL_CLKOUTSEL0_DISABLED;
/* Disable CLKOUT1 output */
CMU->CTRL = (CMU->CTRL & ~_CMU_CTRL_CLKOUTSEL1_MASK)
| CMU_CTRL_CLKOUTSEL1_DISABLED;
// [Clock output]$
// $[CMU_IO]
/* Disable CLKOUT0 pin */
CMU->ROUTEPEN &= ~CMU_ROUTEPEN_CLKOUT0PEN;
/* Disable CLKOUT1 pin */
CMU->ROUTEPEN &= ~CMU_ROUTEPEN_CLKOUT1PEN;
// [CMU_IO]$
}
