STM32-FSMC-NOR FLASH

2018-04-17 来源：eefocus

一、基本概念（详细内容见st网站stm32应用笔记AN2784）

1. FSMC配置
控制一个NOR闪存存储器，需要FSMC提供下述功能：
●选择合适的存储块映射NOR闪存存储器：共有4个独立的存储块可以用于与NOR闪存、SRAM和PSRAM存储器接口，每个存储块都有一个专用的片选管脚。
●使用或禁止地址/数据总线的复用功能。
●选择所用的存储器类型：NOR闪存、SRAM或PSRAM。
●定义外部存储器的数据总线宽度：8或16位。
●使用或关闭同步NOR闪存存储器的突发访问模式。
●配置等待信号的使用：开启或关闭，极性设置，时序配置。
●使用或关闭扩展模式：扩展模式用于访问那些具有不同读写操作时序的存储器。
因为NOR闪存/SRAM控制器可以支持异步和同步存储器，用户只须根据存储器的参数配置使用到的参数。
FSMC提供了一些可编程的参数，可以正确地与外部存储器接口。依存储器类型的不同，有些参数是不需要的。
当使用一个外部异步存储器时，用户必须按照存储器的数据手册给出的时序数据，计算和设置下列参数：
●ADDSET：地址建立时间
●ADDHOLD：地址保持时间
●DATAST：数据建立时间
●ACCMOD：访问模式这个参数允许 FSMC可以灵活地访问多种异步的静态存储器。共有4种扩展模式允许以不同的时序分别读写存储器。在扩展模式下，FSMC_BTR用于配置读操作，FSMC_BWR用于配置写操作。(译注：如果读时序与写时序相同，只须使用FSMC_BTR即可。)
如果使用了同步的存储器，用户必须计算和设置下述参数：
●CLKDIV：时钟分频系数
●DATLAT：数据延时
如果存储器支持的话，NOR闪存的读操作可以是同步的，而写操作仍然是异步的。
当对一个同步的NOR闪存编程时，存储器会自动地在同步与异步之间切换；因此，必须正确地设置所有的参数。

2. 时序计算
如上所述，对于异步NOR闪存存储器或类似的存储，有不同的访问协议。首先要确定对特定存储器所需要使用的操作协议，选择的依据是不同的控制信号和存储器在读或写操作中的动作。
对于异步NOR闪存存储器，需要使用模式2协议。如果要使用的存储器有NADV信号，则需要使用扩展的模式B协议。
我们将使用模式2操作M29W128FL，不使用任何扩展模式，即读和写操作的时序是一样的。这时NOR闪存控制器需要3个时序参数：ADDSET、DATAST和ADDHOLD。
需要根据NOR闪存存储器的特性和STM32F10xxx的时钟HCLK来这些计算参数。
基于图3和图4的NOR闪存存储器访问时序，可以得到下述公式：
写或读访问时序是存储器片选信号的下降沿与上升沿之间的时间，这个时间可以由FSMC时序参数的函数计算得到：
写/读访问时间 = ((ADDSET + 1) + (DATAST + 1)) × HCLK
在写操作中，DATAST用于衡量写信号的下降沿与上升沿之间的时间参数：
写使能信号从低变高的时间 = tWP = DATAST × HCLK
为了得到正确的FSMC时序配置，下列时序应予以考虑：
●最大的读/写访问时间
●不同的FSMC内部延迟
●不同的存储器内部延迟
因此得到：
((ADDSET + 1) + (DATAST + 1)) × HCLK = max (tWC, tRC)
DATAST × HCLK = tWP
DATAST必须满足：
DATAST = (tAVQV + tsu(Data_NE) + tv(A_NE))/HCLK – ADDSET – 4
二、程序分析

/*-- FSMC Configuration ----------------------------------------------------*/
p.FSMC_AddressSetupTime = 0x05;     /*ADDSET 地址建立时间*/
p.FSMC_AddressHoldTime = 0x00;    /*ADDHOLD 地址保持时间*/
p.FSMC_DataSetupTime = 0x07;     /*DATAST 数据建立时间*/
p.FSMC_BusTurnAroundDuration = 0x00;   /*BUSTURN 总线返转时间*/
p.FSMC_CLKDivision = 0x00;      /*CLKDIV 时钟分频*/
p.FSMC_DataLatency = 0x00;     /*DATLAT 数据保持时间*/
p.FSMC_AccessMode = FSMC_AccessMode_B;   /*访问模式*/

/*NOR/SRAM的存储块，共4个选项*/

FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM2;

/*是否选择地址和数据复用数据线*/

FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;

/*连接到相应存储块的外部存储器类型*/

FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_NOR;

/*存储器数据总线宽度*/

FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;

/*使能或关闭同步NOR闪存存储器的突发访问模式设置是否使用迸发访问模式(应该就是连续读写模式吧)*/
FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;

/*设置WAIT信号的有效电平*/

FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;

/*设置是否使用环回模式*/
FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;

/*设置WAIT信号有效时机*/

FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;

/*设定是否使能写操作*/

FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;

/*设定是否使用WAIT信号*/

FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;

/*使能或关闭扩展模式，扩展模式用于访问具有不同读写操作时序的存储器，设定是否使用单独的写时序*/

FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;

/*设定是否使用异步等待信号*/

FSMC_NORSRAMInitStructure.FSMC_AsyncWait = FSMC_AsyncWait_Disable;

/*设定是否使用迸发写模式*/
FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;

/*设定读写时序*/

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); //
}

三、例程：STM32读写外NOR FLASH 存储器 39VF1601

1. fsmc_nor..c

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : fsmc_nor.c
* Author             : MCD Application Team
* Version            : V2.0.1
* Date               : 06/13/2008
* Description        : This file provides a set of functions needed to drive the
*                      M29W128FL, M29W128GL and S29GL128P NOR memories mounted
*                      on STM3210E-EVAL board.
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include 'fsmc_nor.h'

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define Bank1_NOR2_ADDR ((u32)0x64000000)

/* Delay definition */
#define BlockErase_Timeout    ((u32)0x00A00000)
#define ChipErase_Timeout     ((u32)0x30000000)
#define Program_Timeout       ((u32)0x00001400)

/* Private macro -------------------------------------------------------------*/
#define ADDR_SHIFT(A) (Bank1_NOR2_ADDR + (2 * (A)))
#define NOR_WRITE(Address, Data) (*(vu16 *)(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);

/* 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_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_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM2;    // NOR/SRAM的存储块，共4个选项
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable; // 是都选择地址和数据复用数据线
FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_NOR;   // 连接到相应存储块的外部存储器类型
FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b; //存储器数据总线宽度
FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;   // 使能或关闭同步NOR闪存存储器的突发访问模式
                       //设置是否使用迸发访问模式(应该就是连续读写模式吧)
FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;   //   设置WAIT信号的有效电平
FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;    // 设置是否使用环回模式
FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState; // 设置WAIT信号有效时机
FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable; //   设定是否使能写操作
FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;   //    设定是否使用WAIT信号
FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;  // 使能或关闭扩展模式，扩展模式用于访问具有不同读写操作时序的存储器
                    // 设定是否使用单独的写时序
FSMC_NORSRAMInitStructure.FSMC_AsyncWait = FSMC_AsyncWait_Disable;  // 设定是否使用异步等待信号
FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;  // 设定是否使用迸发写模式
FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &p;    // 设定读写时序
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(0x05555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x02AAA), 0x0055);
NOR_WRITE(ADDR_SHIFT(0x05555), 0x0090);

NOR_ID->Manufacturer_Code = *(vu16 *) ADDR_SHIFT(0x0000);
NOR_ID->Device_Code1 = *(vu16 *) ADDR_SHIFT(0x0001);
NOR_ID->Device_Code2 = *(vu16 *) ADDR_SHIFT(0x000E);
NOR_ID->Device_Code3 = *(vu16 *) 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(u32 BlockAddr)
{
NOR_WRITE(ADDR_SHIFT(0x05555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x02AAA), 0x0055);
NOR_WRITE(ADDR_SHIFT(0x05555), 0x0080);
NOR_WRITE(ADDR_SHIFT(0x05555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x02AAA), 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(0x05555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x02AAA), 0x0055);
NOR_WRITE(ADDR_SHIFT(0x05555), 0x0080);
NOR_WRITE(ADDR_SHIFT(0x05555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x02AAA), 0x0055);
NOR_WRITE(ADDR_SHIFT(0x05555), 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(u32 WriteAddr, u16 Data)
{
NOR_WRITE(ADDR_SHIFT(0x05555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x02AAA), 0x0055);
NOR_WRITE(ADDR_SHIFT(0x05555), 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(u16* pBuffer, u32 WriteAddr, u32 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(u16* pBuffer, u32 WriteAddr, u32 NumHalfwordToWrite)
{
u32 lastloadedaddress = 0x00;
u32 currentaddress = 0x00;
u32 endaddress = 0x00;

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

/* Issue unlock command sequence */
NOR_WRITE(ADDR_SHIFT(0x005555), 0x00AA);

NOR_WRITE(ADDR_SHIFT(0x02AAA), 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
*******************************************************************************/
u16 FSMC_NOR_ReadHalfWord(u32 ReadAddr)
{
NOR_WRITE(ADDR_SHIFT(0x005555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x002AAA), 0x0055);
NOR_WRITE((Bank1_NOR2_ADDR + ReadAddr), 0x00F0 );

return (*(vu16 *)((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(u16* pBuffer, u32 ReadAddr, u32 NumHalfwordToRead)
{
NOR_WRITE(ADDR_SHIFT(0x05555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x02AAA), 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++ = *(vu16 *)((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(0x005555), 0x00AA);
NOR_WRITE(ADDR_SHIFT(0x002AAA), 0x0055);
NOR_WRITE(Bank1_NOR2_ADDR, 0x00F0);

return (NOR_SUCCESS);
}

/******************************************************************************
* Function Name : FSMC_NOR_GetStatus
* Description    : Returns the NOR operation status.
* Input          : - Timeout: NOR progamming Timeout
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_GetStatus(u32 Timeout)
{
u16 val1 = 0x00, val2 = 0x00;
NOR_Status status = NOR_ONGOING;
u32 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 = *(vu16 *)(Bank1_NOR2_ADDR);
    val2 = *(vu16 *)(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 = *(vu16 *)(Bank1_NOR2_ADDR);
    val2 = *(vu16 *)(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);
}

2.main.c

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Version            : V2.0.1
* Date               : 06/13/2008
* Description        : Main program body
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

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

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
GPIO_InitTypeDef GPIO_InitStructure;
ErrorStatus HSEStartUpStatus;

u16 TxBuffer[BUFFER_SIZE];
u16 RxBuffer[BUFFER_SIZE];
u32 WriteReadStatus = 0, Index = 0;
NOR_IDTypeDef NOR_ID;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void NVIC_Configuration(void);

void Fill_Buffer(u16 *pBuffer, u16 BufferLenght, u32 Offset);

/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : main
* Description    : Main program.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif

/* System Clocks Configuration */
RCC_Configuration();

/* NVIC Configuration */
NVIC_Configuration();

/* PF.06 and PF.07 config to drive LD1 and LD2 *****************************/
/* Enable GPIOF clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOF, ENABLE);

/* Configure PF.06 and PF.07 as Output push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOF, &GPIO_InitStructure);

/* Write/read to/from FSMC SRAM memory *************************************/
/* Enable the FSMC Clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);

/* Configure FSMC Bank1 NOR/SRAM2 */
FSMC_NOR_Init();

/* Read NOR memory ID */
FSMC_NOR_ReadID(&NOR_ID);

FSMC_NOR_ReturnToReadMode();

/* Erase the NOR memory block to write on */
FSMC_NOR_EraseBlock(WRITE_READ_ADDR);

/* Write data to FSMC NOR memory */
/* Fill the buffer to send */
Fill_Buffer(TxBuffer, BUFFER_SIZE, 0x3210);
FSMC_NOR_WriteBuffer(TxBuffer, WRITE_READ_ADDR, BUFFER_SIZE);

/* Read data from FSMC NOR memory */
FSMC_NOR_ReadBuffer(RxBuffer, WRITE_READ_ADDR, BUFFER_SIZE);

/* Read back NOR memory and check content correctness */
for (Index = 0x00; (Index < BUFFER_SIZE) && (WriteReadStatus == 0); Index++)
{
    if (RxBuffer[Index] != TxBuffer[Index])
    {
      WriteReadStatus = Index + 1;
    }
}

if (WriteReadStatus == 0)
{ /* OK */
    /* Turn on LD1 */
    GPIO_SetBits(GPIOF, GPIO_Pin_6);
}
else
{ /* KO */
    /* Turn on LD2 */
    GPIO_SetBits(GPIOF, GPIO_Pin_7);
}

while (1)
{
}
}

/*******************************************************************************
* Function Name : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();

/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);

/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();

if(HSEStartUpStatus == SUCCESS)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);

    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1);

    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);

/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

/* Enable PLL */
RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
}
}

/*******************************************************************************
* Function Name : NVIC_Configuration
* Description    : Configures Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
}

/*******************************************************************************
* Function name : Fill_Buffer
* Description   : Fill the global buffer
* Input         : - pBuffer: pointer on the Buffer to fill
*                 - BufferSize: size of the buffer to fill
*                 - Offset: first value to fill on the Buffer
* Output param : None
*******************************************************************************/
void Fill_Buffer(u16 *pBuffer, u16 BufferLenght, u32 Offset)
{
u16 IndexTmp = 0;

/* Put in global buffer same values */
for (IndexTmp = 0; IndexTmp < BufferLenght; IndexTmp++ )
{
pBuffer[IndexTmp] = IndexTmp + Offset;
}
}

#ifdef DEBUG
/*******************************************************************************
* Function Name : assert_failed
* Description    : Reports the name of the source file and the source line number
*                  where the assert_param error has occurred.
* Input          : - file: pointer to the source file name
*                  - line: assert_param error line source number
* Output         : None
* Return         : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{
/* User can add his own implementation to report the file name and line number,
     ex: printf('Wrong parameters value: file %s on line %d/r/n', file, line) */

/* Infinite loop */
while (1)
{
}
}
#endif

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