void rtcInit(void){
SUPC->SUPC_CR = SUPC_CR_KEY(0xA5) | SUPC_CR_XTALSEL_CRYSTAL_SEL; //enable oscillator
RTC->RTC_IDR = 0x1f;
RTC->RTC_IER = RTC_IER_SECEN; //enable interrupt
NVIC_EnableIRQ(RTC_IRQn);
}
/**
* \brief Switch slow clock source selection to external 32k (Xtal or Bypass) oscillator.
* This function disables the PLLs.
*
* \note Switching sclk back to 32krc is only possible by shutting down the VDDIO power supply.
*
* \param ul_bypass 0 for Xtal, 1 for bypass.
*/
void supc_switch_sclk_to_32kxtal(Supc *p_supc, uint32_t ul_bypass)
{
/* Set Bypass mode if required */
if (ul_bypass == 1) {
p_supc->SUPC_MR |= SUPC_MR_KEY(SUPC_KEY) | SUPC_MR_OSCBYPASS;
}
p_supc->SUPC_CR |= SUPC_CR_KEY(SUPC_KEY) | SUPC_CR_XTALSEL;
}
/**
* \brief Enable Backup Mode.
* Enter condition: WFE/(VROFF bit = 1) + (SLEEPDEEP bit = 1)
*/
void pmc_enable_backupmode(void)
{
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
#if SAM4S
SUPC->SUPC_CR = SUPC_CR_KEY(0xA5u) | SUPC_CR_VROFF_STOP_VREG;
#else
__WFE();
#endif
}
/**
* \brief Enable Backup Mode. Enter condition: WFE/(VROFF bit = 1) +
* (SLEEPDEEP bit = 1)
*/
void pmc_enable_backupmode(void)
{
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
#if (SAM4S || SAM4E || SAM4N)
SUPC->SUPC_CR = SUPC_CR_KEY(SUPC_KEY_VALUE) | SUPC_CR_VROFF_STOP_VREG;
#else
__WFE();
#endif
}
/**
* \brief Switch slow clock source selection to external 32k (Xtal or Bypass).
*
* \note This function disables the PLLs.
*
* \note Switching SCLK back to 32krc is only possible by shutting down the VDDIO
* power supply.
*
* \param ul_bypass 0 for Xtal, 1 for bypass.
*/
void pmc_switch_sclk_to_32kxtal(uint32_t ul_bypass)
{
/* Set Bypass mode if required */
if (ul_bypass == 1) {
SUPC->SUPC_MR |= SUPC_MR_KEY(SUPC_KEY_VALUE) |
SUPC_MR_OSCBYPASS;
}
SUPC->SUPC_CR |= SUPC_CR_KEY(SUPC_KEY_VALUE) | SUPC_CR_XTALSEL;
}
/* TBD: move it to SUPC driver. */
extern void SUPC_SelectExtCrystal32K(void)
{
/* Select XTAL 32k instead of internal slow RC 32k for slow clock */
if ( (SUPC->SUPC_SR & SUPC_SR_OSCSEL) != SUPC_SR_OSCSEL_CRYST )
{
SUPC->SUPC_CR = SUPC_CR_KEY(0xA5u) | SUPC_CR_XTALSEL_CRYSTAL_SEL;
while( !(SUPC->SUPC_SR & SUPC_SR_OSCSEL) );
}
}
void pmc_sleep(int sleep_mode)
{
switch (sleep_mode) {
case SAM_PM_SMODE_SLEEP_WFI:
case SAM_PM_SMODE_SLEEP_WFE:
#if (SAM4S || SAM4E)
SCB->SCR &= (uint32_t)~SCR_SLEEPDEEP;
cpu_irq_enable();
__WFI();
break;
#else
PMC->PMC_FSMR &= (uint32_t)~PMC_FSMR_LPM;
SCB->SCR &= (uint32_t)~SCR_SLEEPDEEP;
cpu_irq_enable();
if (sleep_mode == SAM_PM_SMODE_SLEEP_WFI)
__WFI();
else
__WFE();
break;
#endif
case SAM_PM_SMODE_WAIT: {
uint32_t mor, pllr0, pllr1, mckr;
cpu_irq_disable();
b_is_fastrc_used = true;
pmc_save_clock_settings(&mor, &pllr0, &pllr1, &mckr);
/* Enter wait mode */
cpu_irq_enable();
pmc_enable_waitmode();
cpu_irq_disable();
pmc_restore_clock_setting(mor, pllr0, pllr1, mckr);
b_is_fastrc_used = false;
if (callback_clocks_restored) {
callback_clocks_restored();
callback_clocks_restored = NULL;
}
cpu_irq_enable();
break;
}
case SAM_PM_SMODE_BACKUP:
SCB->SCR |= SCR_SLEEPDEEP;
#if (SAM4S || SAM4E)
SUPC->SUPC_CR = SUPC_CR_KEY(0xA5u) | SUPC_CR_VROFF_STOP_VREG;
cpu_irq_enable();
__WFI() ;
#else
cpu_irq_enable();
__WFE() ;
#endif
break;
}
}
void clock_init(void)
{
uint32_t timeout;
/* Disable watchdog */
WDT_MR = BV(WDT_WDDIS);
/* Set 4 wait states for flash access, needed for higher CPU clock rates */
EEFC_FMR = EEFC_FMR_FWS(3);
// Select external slow clock
if (!(SUPC_SR & BV(SUPC_SR_OSCSEL)))
{
SUPC_CR = BV(SUPC_CR_XTALSEL) | SUPC_CR_KEY(0xA5);
while (!(SUPC_SR & BV(SUPC_SR_OSCSEL)));
}
// Initialize main oscillator
if (!(CKGR_MOR & BV(CKGR_MOR_MOSCSEL)))
{
CKGR_MOR = CKGR_MOR_KEY(0x37) | BOARD_OSC_COUNT | BV(CKGR_MOR_MOSCRCEN) | BV(CKGR_MOR_MOSCXTEN);
timeout = CLOCK_TIMEOUT;
while (!(PMC_SR & BV(PMC_SR_MOSCXTS)) && --timeout);
}
// Switch to external oscillator
CKGR_MOR = CKGR_MOR_KEY(0x37) | BOARD_OSC_COUNT | BV(CKGR_MOR_MOSCRCEN) | BV(CKGR_MOR_MOSCXTEN) | BV(CKGR_MOR_MOSCSEL);
timeout = CLOCK_TIMEOUT;
while (!(PMC_SR & BV(PMC_SR_MOSCSELS)) && --timeout);
PMC_MCKR = (PMC_MCKR & ~(uint32_t)PMC_MCKR_CSS_MASK) | PMC_MCKR_CSS_MAIN_CLK;
timeout = CLOCK_TIMEOUT;
while (!(PMC_SR & BV(PMC_SR_MCKRDY)) && --timeout);
// Initialize and enable PLL clock
CKGR_PLLR = evaluate_pll() | BV(CKGR_PLLR_STUCKTO1) | CKGR_PLLR_PLLCOUNT(0x1);
timeout = CLOCK_TIMEOUT;
while (!(PMC_SR & BV(PMC_SR_LOCK)) && --timeout);
PMC_MCKR = PMC_MCKR_CSS_MAIN_CLK;
timeout = CLOCK_TIMEOUT;
while (!(PMC_SR & BV(PMC_SR_MCKRDY)) && --timeout);
PMC_MCKR = PMC_MCKR_CSS_PLL_CLK;
timeout = CLOCK_TIMEOUT;
while (!(PMC_SR & BV(PMC_SR_MCKRDY)) && --timeout);
/* Enable clock on PIO for inputs */
PMC_PCER = BV(PIOA_ID) | BV(PIOB_ID) | BV(PIOC_ID);
}
/**
* \brief Performs the low-level initialization of the chip.
* This includes EFC and master clock configuration.
* It also enable a low level on the pin NRST triggers a user reset.
*/
extern WEAK void LowLevelInit( void )
{
uint32_t timeout = 0;
/* Set 3 FWS for Embedded Flash Access */
EFC->EEFC_FMR = EEFC_FMR_FWS(3);
/* Select external slow clock */
if ((SUPC->SUPC_SR & SUPC_SR_OSCSEL) != SUPC_SR_OSCSEL_CRYST)
{
SUPC->SUPC_CR = (uint32_t)(SUPC_CR_XTALSEL_CRYSTAL_SEL | SUPC_CR_KEY(0xA5));
timeout = 0;
while (!(SUPC->SUPC_SR & SUPC_SR_OSCSEL_CRYST) );
}
/* Initialize main oscillator */
if ( !(PMC->CKGR_MOR & CKGR_MOR_MOSCSEL) )
{
PMC->CKGR_MOR = CKGR_MOR_KEY(0x37) | BOARD_OSCOUNT | CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN;
timeout = 0;
while (!(PMC->PMC_SR & PMC_SR_MOSCXTS) && (timeout++ < CLOCK_TIMEOUT));
}
/* Switch to 3-20MHz Xtal oscillator */
PMC->CKGR_MOR = CKGR_MOR_KEY(0x37) | BOARD_OSCOUNT | CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN | CKGR_MOR_MOSCSEL;
timeout = 0;
while (!(PMC->PMC_SR & PMC_SR_MOSCSELS) && (timeout++ < CLOCK_TIMEOUT));
PMC->PMC_MCKR = (PMC->PMC_MCKR & ~(uint32_t)PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK;
for ( timeout = 0; !(PMC->PMC_SR & PMC_SR_MCKRDY) && (timeout++ < CLOCK_TIMEOUT) ; );
/* Initialize PLLA */
PMC->CKGR_PLLAR = BOARD_PLLAR;
timeout = 0;
while (!(PMC->PMC_SR & PMC_SR_LOCKA) && (timeout++ < CLOCK_TIMEOUT));
/* Switch to main clock */
PMC->PMC_MCKR = (BOARD_MCKR & ~PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK;
for ( timeout = 0; !(PMC->PMC_SR & PMC_SR_MCKRDY) && (timeout++ < CLOCK_TIMEOUT) ; );
PMC->PMC_MCKR = BOARD_MCKR ;
for ( timeout = 0; !(PMC->PMC_SR & PMC_SR_MCKRDY) && (timeout++ < CLOCK_TIMEOUT) ; );
}
/**
* \brief Switch off the voltage regulator to put the device in backup mode.
*
* \param p_supc Pointer to a SUPC instance.
*/
void supc_enable_backup_mode(Supc *p_supc)
{
p_supc->SUPC_CR = SUPC_CR_KEY(SUPC_KEY) | SUPC_CR_VROFF;
}