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/**************************************************************************//**
* @file ebi.c
* @brief External Bus Interface(EBI) driver source file
*
* SPDX-License-Identifier: Apache-2.0
* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include "NuMicro.h"
/** @addtogroup Standard_Driver Standard Driver
@{
*/
/** @addtogroup EBI_Driver EBI Driver
@{
*/
/** @addtogroup EBI_EXPORTED_FUNCTIONS EBI Exported Functions
@{
*/
/**
* @brief Initialize EBI for specify Bank
*
* @param[in] u32Bank Bank number for EBI. Valid values are:
* - \ref EBI_BANK0
* - \ref EBI_BANK1
* - \ref EBI_BANK2
* @param[in] u32DataWidth Data bus width. Valid values are:
* - \ref EBI_BUSWIDTH_8BIT
* - \ref EBI_BUSWIDTH_16BIT
* @param[in] u32TimingClass Default timing configuration. Valid values are:
* - \ref EBI_TIMING_FASTEST
* - \ref EBI_TIMING_VERYFAST
* - \ref EBI_TIMING_FAST
* - \ref EBI_TIMING_NORMAL
* - \ref EBI_TIMING_SLOW
* - \ref EBI_TIMING_VERYSLOW
* - \ref EBI_TIMING_SLOWEST
* @param[in] u32BusMode Set EBI bus operate mode. Valid values are:
* - \ref EBI_OPMODE_NORMAL
* - \ref EBI_OPMODE_CACCESS
* - \ref EBI_OPMODE_ADSEPARATE
* @param[in] u32CSActiveLevel CS is active High/Low. Valid values are:
* - \ref EBI_CS_ACTIVE_HIGH
* - \ref EBI_CS_ACTIVE_LOW
*
* @return None
*
* @details This function is used to open specify EBI bank with different bus width, timing setting and \n
* active level of CS pin to access EBI device.
* @note Write Buffer Enable(WBUFEN) and Extend Time Of ALE(TALE) are only available in EBI bank0 control register.
*/
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_8 << 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_16 << 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;
}
}
/**
* @brief Disable EBI on specify Bank
*
* @param[in] u32Bank Bank number for EBI. Valid values are:
* - \ref EBI_BANK0
* - \ref EBI_BANK1
* - \ref EBI_BANK2
*
* @return None
*
* @details This function is used to close specify EBI function.
*/
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;
}
/**
* @brief Set EBI Bus Timing for specify Bank
*
* @param[in] u32Bank Bank number for EBI. Valid values are:
* - \ref EBI_BANK0
* - \ref EBI_BANK1
* - \ref EBI_BANK2
* @param[in] u32TimingConfig Configure EBI timing settings, includes TACC, TAHD, W2X and R2R setting.
* @param[in] u32MclkDiv Divider for MCLK. Valid values are:
* - \ref EBI_MCLKDIV_1
* - \ref EBI_MCLKDIV_2
* - \ref EBI_MCLKDIV_4
* - \ref EBI_MCLKDIV_8
* - \ref EBI_MCLKDIV_16
* - \ref EBI_MCLKDIV_32
* - \ref EBI_MCLKDIV_64
* - \ref EBI_MCLKDIV_128
*
* @return None
*
* @details This function is used to configure specify EBI bus timing for access EBI device.
*/
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 */
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