ebi.c

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/**************************************************************************/
#include "NuMicro.h"

void EBI_Open(uint32_t u32Bank, uint32_t u32DataWidth, uint32_t u32TimingClass, uint32_t u32BusMode, uint32_t u32CSActiveLevel)
{
    uint32_t u32Index0 = (uint32_t)&EBI->CTL0 + (uint32_t)u32Bank * 0x10U;
    uint32_t u32Index1 = (uint32_t)&EBI->TCTL0 + (uint32_t)u32Bank * 0x10U;
    volatile uint32_t *pu32EBICTL  = (uint32_t *)( u32Index0 );
    volatile uint32_t *pu32EBITCTL = (uint32_t *)( u32Index1 );

    if(u32DataWidth == EBI_BUSWIDTH_8BIT)
    {
        *pu32EBICTL &= ~EBI_CTL_DW16_Msk;
    }
    else
    {
        *pu32EBICTL |= EBI_CTL_DW16_Msk;
    }

    *pu32EBICTL |= u32BusMode;

    switch(u32TimingClass)
    {
    case EBI_TIMING_FASTEST:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
                      (EBI_MCLKDIV_1 << EBI_CTL_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk;
        *pu32EBITCTL = 0x0U;
        break;

    case EBI_TIMING_VERYFAST:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
                      (EBI_MCLKDIV_1 << EBI_CTL_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk |
                      (0x3U << EBI_CTL_TALE_Pos) ;
        *pu32EBITCTL = 0x03003318U;
        break;

    case EBI_TIMING_FAST:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
                      (EBI_MCLKDIV_2 << EBI_CTL_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk;
        *pu32EBITCTL = 0x0U;
        break;

    case EBI_TIMING_NORMAL:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
                      (EBI_MCLKDIV_2 << EBI_CTL_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk |
                      (0x3U << EBI_CTL_TALE_Pos) ;
        *pu32EBITCTL = 0x03003318U;
        break;

    case EBI_TIMING_SLOW:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
                      (EBI_MCLKDIV_2 << EBI_CTL_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk |
                      (0x7U << EBI_CTL_TALE_Pos) ;
        *pu32EBITCTL = 0x07007738U;
        break;

    case EBI_TIMING_VERYSLOW:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
                      (EBI_MCLKDIV_4 << EBI_CTL_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk |
                      (0x7U << EBI_CTL_TALE_Pos) ;
        *pu32EBITCTL = 0x07007738U;
        break;

    case EBI_TIMING_SLOWEST:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
                      (EBI_MCLKDIV_8 << EBI_CTL_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk |
                      (0x7U << EBI_CTL_TALE_Pos) ;
        *pu32EBITCTL = 0x07007738U;
        break;

    default:
        *pu32EBICTL &= ~EBI_CTL_EN_Msk;
        break;
    }
}

void EBI_Close(uint32_t u32Bank)
{
    uint32_t u32Index = (uint32_t)&EBI->CTL0 + u32Bank * 0x10U;
    volatile uint32_t *pu32EBICTL = (uint32_t *)( u32Index );

    *pu32EBICTL &= ~EBI_CTL_EN_Msk;
}

void EBI_SetBusTiming(uint32_t u32Bank, uint32_t u32TimingConfig, uint32_t u32MclkDiv)
{
    uint32_t u32Index0 = (uint32_t)&EBI->CTL0 + (uint32_t)u32Bank * 0x10U;
    uint32_t u32Index1 = (uint32_t)&EBI->TCTL0 + (uint32_t)u32Bank * 0x10U;
    volatile uint32_t *pu32EBICTL  = (uint32_t *)( u32Index0 );
    volatile uint32_t *pu32EBITCTL = (uint32_t *)( u32Index1 );

    *pu32EBICTL = (*pu32EBICTL & ~EBI_CTL_MCLKDIV_Msk) | (u32MclkDiv << EBI_CTL_MCLKDIV_Pos);
    *pu32EBITCTL = u32TimingConfig;
}
 /* end of group EBI_EXPORTED_FUNCTIONS */
 /* end of group EBI_Driver */
 /* end of group Standard_Driver */

/*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/