/**
  ******************************************************************************
  * @file    fsmc_nor.c
  * @author  MCD Application Team
  * @version V3.4.0
  * @date    29-June-2012
  * @brief   This file provides a set of functions needed to drive the M29W128FL,
  *          M29W128GL and S29GL128P NOR memories mounted on STM3210E-EVAL board.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "fsmc_nor.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define Bank1_NOR2_ADDR       ((uint32_t)0x64000000)

/* Delay definition */   
#define BlockErase_Timeout    ((uint32_t)0x00A00000)
#define ChipErase_Timeout     ((uint32_t)0x30000000) 
#define Program_Timeout       ((uint32_t)0x00001400)

/* Private macro -------------------------------------------------------------*/
#define ADDR_SHIFT(A) (Bank1_NOR2_ADDR + (2 * (A)))
#define NOR_WRITE(Address, Data)  (*(__IO uint16_t *)(Address) = (Data))

/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name  : FSMC_NOR_Init
* Description    : Configures the FSMC and GPIOs to interface with the NOR memory.
*                  This function must be called before any write/read operation
*                  on the NOR.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void FSMC_NOR_Init(void)
{
  FSMC_NORSRAMInitTypeDef  FSMC_NORSRAMInitStructure;
  FSMC_NORSRAMTimingInitTypeDef  p;
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | 
                         RCC_APB2Periph_GPIOF | RCC_APB2Periph_GPIOG, ENABLE);

  /*-- GPIO Configuration ------------------------------------------------------*/
  /* NOR Data lines configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_8 | GPIO_Pin_9 |
                                GPIO_Pin_10 | GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 |
                                GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 |
                                GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_Init(GPIOE, &GPIO_InitStructure);

  /* NOR Address lines configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 |
                                GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_12 | GPIO_Pin_13 |
                                GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_Init(GPIOF, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 |
                                GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;                            
  GPIO_Init(GPIOG, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6;
  GPIO_Init(GPIOE, &GPIO_InitStructure);

  /* NOE and NWE configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  /* NE2 configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_Init(GPIOG, &GPIO_InitStructure);

  /*-- FSMC Configuration ----------------------------------------------------*/
  p.FSMC_AddressSetupTime = 0x02;
  p.FSMC_AddressHoldTime = 0x00;
  p.FSMC_DataSetupTime = 0x05;
  p.FSMC_BusTurnAroundDuration = 0x00;
  p.FSMC_CLKDivision = 0x00;
  p.FSMC_DataLatency = 0x00;
  p.FSMC_AccessMode = FSMC_AccessMode_B;

  FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM2;
  FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
  FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_NOR;
  FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;
  FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;
  FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
  FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;
  FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;
  FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;
  FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;
  FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;
  FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
  FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &p;
  FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &p;

  FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);

  /* Enable FSMC Bank1_NOR Bank */
  FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM2, ENABLE);
}

/******************************************************************************
* Function Name  : FSMC_NOR_ReadID
* Description    : Reads NOR memory's Manufacturer and Device Code.
* Input          : - NOR_ID: pointer to a NOR_IDTypeDef structure which will hold
*                    the Manufacturer and Device Code.
* Output         : None
* Return         : None
*******************************************************************************/
void FSMC_NOR_ReadID(NOR_IDTypeDef* NOR_ID)
{
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x0090);

  NOR_ID->Manufacturer_Code = *(__IO uint16_t *) ADDR_SHIFT(0x0000);
  NOR_ID->Device_Code1 = *(__IO uint16_t *) ADDR_SHIFT(0x0001);
  NOR_ID->Device_Code2 = *(__IO uint16_t *) ADDR_SHIFT(0x000E);
  NOR_ID->Device_Code3 = *(__IO uint16_t *) ADDR_SHIFT(0x000F);
}

/*******************************************************************************
* Function Name  : FSMC_NOR_EraseBlock
* Description    : Erases the specified Nor memory block.
* Input          : - BlockAddr: address of the block to erase.
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_EraseBlock(uint32_t BlockAddr)
{
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x0080);
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);
  NOR_WRITE((Bank1_NOR2_ADDR + BlockAddr), 0x30);

  return (FSMC_NOR_GetStatus(BlockErase_Timeout));
}

/*******************************************************************************
* Function Name  : FSMC_NOR_EraseChip
* Description    : Erases the entire chip.
* Input          : None                      
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_EraseChip(void)
{
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x0080);
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x0010);

  return (FSMC_NOR_GetStatus(ChipErase_Timeout));
}

/******************************************************************************
* Function Name  : FSMC_NOR_WriteHalfWord
* Description    : Writes a half-word to the NOR memory. 
* Input          : - WriteAddr : NOR memory internal address to write to.
*                  - Data : Data to write. 
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_WriteHalfWord(uint32_t WriteAddr, uint16_t Data)
{
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x00A0);
  NOR_WRITE((Bank1_NOR2_ADDR + WriteAddr), Data);

  return (FSMC_NOR_GetStatus(Program_Timeout));
}

/*******************************************************************************
* Function Name  : FSMC_NOR_WriteBuffer
* Description    : Writes a half-word buffer to the FSMC NOR memory. 
* Input          : - pBuffer : pointer to buffer. 
*                  - WriteAddr : NOR memory internal address from which the data 
*                    will be written.
*                  - NumHalfwordToWrite : number of Half words to write. 
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_WriteBuffer(uint16_t* pBuffer, uint32_t WriteAddr, uint32_t NumHalfwordToWrite)
{
  NOR_Status status = NOR_ONGOING; 

  do
  {
    /* Transfer data to the memory */
    status = FSMC_NOR_WriteHalfWord(WriteAddr, *pBuffer++);
    WriteAddr = WriteAddr + 2;
    NumHalfwordToWrite--;
  }
  while((status == NOR_SUCCESS) && (NumHalfwordToWrite != 0));
  
  return (status); 
}

/*******************************************************************************
* Function Name  : FSMC_NOR_ProgramBuffer
* Description    : Writes a half-word buffer to the FSMC NOR memory. This function 
*                  must be used only with S29GL128P NOR memory.
* Input          : - pBuffer : pointer to buffer. 
*                  - WriteAddr: NOR memory internal address from which the data 
*                    will be written.
*                  - NumHalfwordToWrite: number of Half words to write.
*                    The maximum allowed value is 32 Half words (64 bytes).
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_ProgramBuffer(uint16_t* pBuffer, uint32_t WriteAddr, uint32_t NumHalfwordToWrite)
{       
  uint32_t lastloadedaddress = 0x00;
  uint32_t currentaddress = 0x00;
  uint32_t endaddress = 0x00;

  /* Initialize variables */
  currentaddress = WriteAddr;
  endaddress = WriteAddr + NumHalfwordToWrite - 1;
  lastloadedaddress = WriteAddr;

  /* Issue unlock command sequence */
  NOR_WRITE(ADDR_SHIFT(0x00555), 0x00AA);

  NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);  

  /* Write Write Buffer Load Command */
  NOR_WRITE(ADDR_SHIFT(WriteAddr), 0x0025);
  NOR_WRITE(ADDR_SHIFT(WriteAddr), (NumHalfwordToWrite - 1));

  /* Load Data into NOR Buffer */
  while(currentaddress <= endaddress)
  {
    /* Store last loaded address & data value (for polling) */
    lastloadedaddress = currentaddress;
 
    NOR_WRITE(ADDR_SHIFT(currentaddress), *pBuffer++);
    currentaddress += 1; 
  }

  NOR_WRITE(ADDR_SHIFT(lastloadedaddress), 0x29);
  
  return(FSMC_NOR_GetStatus(Program_Timeout));
}

/******************************************************************************
* Function Name  : FSMC_NOR_ReadHalfWord
* Description    : Reads a half-word from the NOR memory. 
* Input          : - ReadAddr : NOR memory internal address to read from.
* Output         : None
* Return         : Half-word read from the NOR memory
*******************************************************************************/
uint16_t FSMC_NOR_ReadHalfWord(uint32_t ReadAddr)
{
  NOR_WRITE(ADDR_SHIFT(0x00555), 0x00AA); 
  NOR_WRITE(ADDR_SHIFT(0x002AA), 0x0055);  
  NOR_WRITE((Bank1_NOR2_ADDR + ReadAddr), 0x00F0 );

  return (*(__IO uint16_t *)((Bank1_NOR2_ADDR + ReadAddr)));
}

/*******************************************************************************
* Function Name  : FSMC_NOR_ReadBuffer
* Description    : Reads a block of data from the FSMC NOR memory.
* Input          : - pBuffer : pointer to the buffer that receives the data read 
*                    from the NOR memory.
*                  - ReadAddr : NOR memory internal address to read from.
*                  - NumHalfwordToRead : number of Half word to read.
* Output         : None
* Return         : None
*******************************************************************************/
void FSMC_NOR_ReadBuffer(uint16_t* pBuffer, uint32_t ReadAddr, uint32_t NumHalfwordToRead)
{
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);
  NOR_WRITE((Bank1_NOR2_ADDR + ReadAddr), 0x00F0);

  for(; NumHalfwordToRead != 0x00; NumHalfwordToRead--) /* while there is data to read */
  {
    /* Read a Halfword from the NOR */
    *pBuffer++ = *(__IO uint16_t *)((Bank1_NOR2_ADDR + ReadAddr));
    ReadAddr = ReadAddr + 2; 
  }  
}

/******************************************************************************
* Function Name  : FSMC_NOR_ReturnToReadMode
* Description    : Returns the NOR memory to Read mode.
* Input          : None
* Output         : None
* Return         : NOR_SUCCESS
*******************************************************************************/
NOR_Status FSMC_NOR_ReturnToReadMode(void)
{
  NOR_WRITE(Bank1_NOR2_ADDR, 0x00F0);

  return (NOR_SUCCESS);
}

/******************************************************************************
* Function Name  : FSMC_NOR_Reset
* Description    : Returns the NOR memory to Read mode and resets the errors in
*                  the NOR memory Status Register.
* Input          : None
* Output         : None
* Return         : NOR_SUCCESS
*******************************************************************************/
NOR_Status FSMC_NOR_Reset(void)
{
  NOR_WRITE(ADDR_SHIFT(0x00555), 0x00AA); 
  NOR_WRITE(ADDR_SHIFT(0x002AA), 0x0055); 
  NOR_WRITE(Bank1_NOR2_ADDR, 0x00F0); 

  return (NOR_SUCCESS);
}

/******************************************************************************
* Function Name  : FSMC_NOR_GetStatus
* Description    : Returns the NOR operation status.
* Input          : - Timeout: NOR programming Timeout
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_GetStatus(uint32_t Timeout)
{ 
  uint16_t val1 = 0x00, val2 = 0x00;
  NOR_Status status = NOR_ONGOING; 
  uint32_t timeout = Timeout;

  /* Poll on NOR memory Ready/Busy signal ------------------------------------*/
  while((GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_6) != RESET) && (timeout > 0)) 
  {
    timeout--;
  }

  timeout = Timeout;
  
  while((GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_6) == RESET) && (timeout > 0))   
  {
    timeout--;
  }
  
  /* Get the NOR memory operation status -------------------------------------*/
  while((Timeout != 0x00) && (status != NOR_SUCCESS))
  {
    Timeout--;

	  /* Read DQ6 and DQ5 */
    val1 = *(__IO uint16_t *)(Bank1_NOR2_ADDR);
    val2 = *(__IO uint16_t *)(Bank1_NOR2_ADDR);

    /* If DQ6 did not toggle between the two reads then return NOR_Success */
    if((val1 & 0x0040) == (val2 & 0x0040)) 
    {
      return NOR_SUCCESS;
    }

    if((val1 & 0x0020) != 0x0020)
    {
      status = NOR_ONGOING;
    }

    val1 = *(__IO uint16_t *)(Bank1_NOR2_ADDR);
    val2 = *(__IO uint16_t *)(Bank1_NOR2_ADDR);
    
    if((val1 & 0x0040) == (val2 & 0x0040)) 
    {
      return NOR_SUCCESS;
    }
    else if((val1 & 0x0020) == 0x0020)
    {
      return NOR_ERROR;
    }
  }

  if(Timeout == 0x00)
  {
    status = NOR_TIMEOUT;
  } 

  /* Return the operation status */
  return (status);
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
