ebi.c

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/**************************************************************************/
#include "M4521.h"
 
 
void EBI_Open(uint32_t u32Bank, uint32_t u32DataWidth, uint32_t u32TimingClass, uint32_t u32BusMode, uint32_t u32CSActiveLevel)
{
    volatile uint32_t *pu32EBICTL  = (uint32_t *)((uint32_t)&EBI->CTL0 + (u32Bank * 0x10));
    volatile uint32_t *pu32EBITCTL = (uint32_t *)((uint32_t)&EBI->TCTL0 + (u32Bank * 0x10));
 
    if(u32DataWidth == EBI_BUSWIDTH_8BIT)
        *pu32EBICTL &= ~EBI_CTL0_DW16_Msk;
    else
        *pu32EBICTL |= EBI_CTL0_DW16_Msk;
 
    switch(u32TimingClass)
    {
    case EBI_TIMING_FASTEST:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL0_MCLKDIV_Msk | EBI_CTL0_TALE_Msk)) |
                      (EBI_MCLKDIV_1 << EBI_CTL0_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL0_CSPOLINV_Pos) | EBI_CTL0_EN_Msk;
        *pu32EBITCTL = 0x0;
        break;
 
    case EBI_TIMING_VERYFAST:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL0_MCLKDIV_Msk | EBI_CTL0_TALE_Msk)) |
                      (EBI_MCLKDIV_1 << EBI_CTL0_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL0_CSPOLINV_Pos) | EBI_CTL0_EN_Msk |
                      (0x3 << EBI_CTL0_TALE_Pos) ;
        *pu32EBITCTL = 0x03003318;
        break;
 
    case EBI_TIMING_FAST:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL0_MCLKDIV_Msk | EBI_CTL0_TALE_Msk)) |
                      (EBI_MCLKDIV_2 << EBI_CTL0_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL0_CSPOLINV_Pos) | EBI_CTL0_EN_Msk;
        *pu32EBITCTL = 0x0;
        break;
 
    case EBI_TIMING_NORMAL:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL0_MCLKDIV_Msk | EBI_CTL0_TALE_Msk)) |
                      (EBI_MCLKDIV_2 << EBI_CTL0_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL0_CSPOLINV_Pos) | EBI_CTL0_EN_Msk |
                      (0x3 << EBI_CTL0_TALE_Pos) ;
        *pu32EBITCTL = 0x03003318;
        break;
 
    case EBI_TIMING_SLOW:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL0_MCLKDIV_Msk | EBI_CTL0_TALE_Msk)) |
                      (EBI_MCLKDIV_2 << EBI_CTL0_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL0_CSPOLINV_Pos) | EBI_CTL0_EN_Msk |
                      (0x7 << EBI_CTL0_TALE_Pos) ;
        *pu32EBITCTL = 0x07007738;
        break;
 
    case EBI_TIMING_VERYSLOW:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL0_MCLKDIV_Msk | EBI_CTL0_TALE_Msk)) |
                      (EBI_MCLKDIV_4 << EBI_CTL0_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL0_CSPOLINV_Pos) | EBI_CTL0_EN_Msk |
                      (0x7 << EBI_CTL0_TALE_Pos) ;
        *pu32EBITCTL = 0x07007738;
        break;
 
    case EBI_TIMING_SLOWEST:
        *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL0_MCLKDIV_Msk | EBI_CTL0_TALE_Msk)) |
                      (EBI_MCLKDIV_8 << EBI_CTL0_MCLKDIV_Pos) |
                      (u32CSActiveLevel << EBI_CTL0_CSPOLINV_Pos) | EBI_CTL0_EN_Msk |
                      (0x7 << EBI_CTL0_TALE_Pos) ;
        *pu32EBITCTL = 0x07007738;
        break;
 
    default:
        *pu32EBICTL &= ~EBI_CTL0_EN_Msk;
        break;
    }
}
 
void EBI_Close(uint32_t u32Bank)
{
    volatile uint32_t *pu32EBICTL = (uint32_t *)((uint32_t)&EBI->CTL0 + (u32Bank * 0x10));
 
    *pu32EBICTL &= ~EBI_CTL0_EN_Msk;
}
 
void EBI_SetBusTiming(uint32_t u32Bank, uint32_t u32TimingConfig, uint32_t u32MclkDiv)
{
    volatile uint32_t *pu32EBICTL  = (uint32_t *)((uint32_t)&EBI->CTL0 + (u32Bank * 0x10));
    volatile uint32_t *pu32EBITCTL = (uint32_t *)((uint32_t)&EBI->TCTL0 + (u32Bank * 0x10));
 
    *pu32EBICTL = (*pu32EBICTL & ~EBI_CTL0_MCLKDIV_Msk) | (u32MclkDiv << EBI_CTL0_MCLKDIV_Pos);
    *pu32EBITCTL = u32TimingConfig;
}
 /* end of group EBI_EXPORTED_FUNCTIONS */
 /* end of group EBI_Driver */
 /* end of group Standard_Driver */
 
/*** (C) COPYRIGHT 2022 Nuvoton Technology Corp. ***/