LowLevelInit
Default mainpageat91libboardsat91sam9260-ekLowLevelInit
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
}