Description
Source
Call Graph
Start Line: 123
void LowLevelInit(void)
{
unsigned char i;
// If already running in sdram, PLL settings have already been done
#if !defined(sdram)
/* Initialize main oscillator
****************************/
AT91C_BASE_PMC->PMC_MOR = BOARD_OSCOUNT | AT91C_CKGR_MOSCEN;
while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS));
/* Initialize PLLA at 200MHz (198.656) */
AT91C_BASE_PMC->PMC_PLLAR = BOARD_CKGR_PLLA
| BOARD_PLLACOUNT
| BOARD_MULA
| BOARD_DIVA;
while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKA));
// Initialize PLLB for USB usage (if not already locked)
if (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKB)) {
AT91C_BASE_PMC->PMC_PLLBR = BOARD_USBDIV
| BOARD_CKGR_PLLB
| BOARD_PLLBCOUNT
| BOARD_MULB
| BOARD_DIVB;
while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKB));
}
/* Wait for the master clock if it was already initialized */
while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
/* Switch to fast clock
**********************/
/* Switch to main oscillator + prescaler */
AT91C_BASE_PMC->PMC_MCKR = BOARD_PRESCALER;
while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
/* Switch to PLL + prescaler */
AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLLA_CLK;
while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
#endif //#if !defined(sdram)
/* Initialize AIC
****************/
AT91C_BASE_AIC->AIC_IDCR = 0xFFFFFFFF;
AT91C_BASE_AIC->AIC_SVR[0] = (unsigned int) defaultFiqHandler;
for (i = 1; i < 31; i++) {
AT91C_BASE_AIC->AIC_SVR[i] = (unsigned int) defaultIrqHandler;
}
AT91C_BASE_AIC->AIC_SPU = (unsigned int) defaultSpuriousHandler;
// Unstack nested interrupts
for (i = 0; i < 8 ; i++) {
AT91C_BASE_AIC->AIC_EOICR = 0;
}
/* Watchdog initialization
*************************/
AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDDIS;
/* Remap
*******/
BOARD_RemapRam();
// Disable RTT and PIT interrupts (potential problem when program A
// configures RTT, then program B wants to use PIT only, interrupts
// from the RTT will still occur since they both use AT91C_ID_SYS)
AT91C_BASE_RTTC->RTTC_RTMR &= ~(AT91C_RTTC_ALMIEN | AT91C_RTTC_RTTINCIEN);
AT91C_BASE_PITC->PITC_PIMR &= ~AT91C_PITC_PITIEN;
#if defined(norflash)
BOARD_ConfigureNorFlash(BOARD_NORFLASH_DFT_BUS_SIZE);
#endif
}