spi_flash.c

AT26F004 驱动

/****************************************
* File Name          : spi_flash.c
* Author             : 
* Date First Issued  : 2009.4.20
* Description        : AT26F004 驱动
* vertion            : 1.0
* 注意               : 本驱动是为ST公司的ST103F系列Soc开发的，需要ST公司库的支持
********************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "spi_flash.h"     //包含ST公司库的头文件

/* Private typedef -----------------------------------------------------------*/
//#define SPI_FLASH_PageSize 256

#define SeWRITE    0xAF  /* Sequential Write to Memory instruction */
#define WRITE      0x02  /* Write to Memory instruction */
#define WRSR       0x01  /* Write Status Register instruction */ 
#define WREN       0x06  /* Write enable instruction */
#define UNPRO      0x39  /* 解除扇区保护*/
#define READ       0x03  /* Read from Memory instruction */
#define RDSR       0x05  /* Read Status Register instruction  */
#define RDID       0x9F  /* Read identification */
#define SE         0xD8  /* 64K Sector Erase instruction */
#define BE         0xC7  /* Bulk Erase instruction */
#define RDSPR	   0x3C  /* 读扇区保护寄存器*/

#define BUSY_READY   0x01  /* Device is ready or busy bit in Status Register*/

#define Dummy_Byte 0xA5

/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
* Function Name  : SPI_FLASH_Init
* Description    : 初始化SPI2和GPIOB ，作为Flash应用
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_Init(void)
{
  SPI_InitTypeDef  SPI_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
   
   /* Enable SPI2 and GPIOB clocks */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
  
  /* Configure SPI2 pins: NSS, SCK, MISO and MOSI */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* Configure PB.12 as Output push-pull, used as Flash Chip select */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();

  /* SPI2 configuration */ 
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI2, &SPI_InitStructure);
  
  /* Enable SPI2  */
  SPI_Cmd(SPI2, ENABLE);   
}

/*******************************************************************************
* Function Name  : SPI_FLASH_SectorErase
* Description    : 扇区擦除函数
* Input          : SectorAddr: 要擦除的地址
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_SectorErase(u32 SectorAddr)
{
  /* Send write enable instruction */
  SPI_FLASH_WriteEnable();

  /* Sector Erase */ 
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();
  /* Send Sector Erase instruction */
  SPI_FLASH_SendByte(SE);
  /* Send SectorAddr high nibble address byte */
  SPI_FLASH_SendByte((SectorAddr & 0xFF0000) >> 16);
  /* Send SectorAddr medium nibble address byte */
  SPI_FLASH_SendByte((SectorAddr & 0xFF00) >> 8);
  /* Send SectorAddr low nibble address byte */
  SPI_FLASH_SendByte(SectorAddr & 0xFF);
  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();

  /* Wait the end of Flash writing */
  SPI_FLASH_WaitForWriteEnd();
}

/*******************************************************************************
* Function Name  : SPI_FLASH_BulkErase
* Description    : 擦除整个FLASH
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_BulkErase(void)
{
  /* Send write enable instruction */
  SPI_FLASH_WriteEnable();

  /* Bulk Erase */ 
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();
  /* Send Bulk Erase instruction  */
  SPI_FLASH_SendByte(BE);
  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();

  /* Wait the end of Flash writing */
  SPI_FLASH_WaitForWriteEnd();
}

/*******************************************************************************
* Function Name  : SPI_FLASH_ByteWrite
* Description    : 向FLASH中写一个单个字节                
* Input          : WriteAddr : FLASH's internal address to write to.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_ByteWrite(u32 WriteAddr ,u8 i)
{
  /* Enable the write access to the FLASH */
  SPI_FLASH_WriteEnable();
  
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();
  /* Send "Write to Memory " instruction */
  SPI_FLASH_SendByte(WRITE);
  /* Send WriteAddr high nibble address byte to write to */
  SPI_FLASH_SendByte((WriteAddr & 0xFF0000) >> 16);
  /* Send WriteAddr medium nibble address byte to write to */
  SPI_FLASH_SendByte((WriteAddr & 0xFF00) >> 8);  
  /* Send WriteAddr low nibble address byte to write to */
  SPI_FLASH_SendByte(WriteAddr & 0xFF);

  SPI_FLASH_SendByte(i);
  
  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();
  
  /* Wait the end of Flash writing */
  SPI_FLASH_WaitForWriteEnd();
}

/*******************************************************************************
* Function Name  : SPI_FLASH_SequentialWrite
* Description    : 向FLASH中的写入多个数
* Input          : - pBuffer : pointer to the buffer  containing the data to be 
*                    written to the FLASH.
*                  - WriteAddr : FLASH's internal address to write to.
*                  - NumByteToWrite : number of bytes to write to the FLASH,
*                    must be equal or less than "SPI_FLASH_PageSize" value. 
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_SequentialWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
{
  /* Enable the write access to the FLASH */
  SPI_FLASH_WriteEnable();
  
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();
  /* Send "sequtial Write to Memory " instruction */
  SPI_FLASH_SendByte(SeWRITE);
  /* Send WriteAddr high nibble address byte to write to */
  SPI_FLASH_SendByte((WriteAddr & 0xFF0000) >> 16);
  /* Send WriteAddr medium nibble address byte to write to */
  SPI_FLASH_SendByte((WriteAddr & 0xFF00) >> 8);  
  /* Send WriteAddr low nibble address byte to write to */
  SPI_FLASH_SendByte(WriteAddr & 0xFF);
  //写第一个字节
  SPI_FLASH_SendByte(*pBuffer);
  //要写字节数据的个数减一
  NumByteToWrite--;
  
  /* while there is data to be written on the FLASH */
  while(NumByteToWrite--) 
  {
    /* Wait the end of Flash writing */
    SPI_FLASH_WaitForWriteEnd();
	/* Send "sequtial Write to Memory " instruction */
    SPI_FLASH_SendByte(SeWRITE);
    /* Send the current byte */
    SPI_FLASH_SendByte(*pBuffer);
    /* Point on the next byte to be written */
    pBuffer++; 
  }
  
  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();
  
  /* Wait the end of Flash writing */
  SPI_FLASH_WaitForWriteEnd();
}

/*******************************************************************************
* Function Name  : SPI_FLASH_BufferWrite
* Description    : Writes block of data to the FLASH. In this function, the
*                  number of WRITE cycles are reduced, using Page WRITE sequence.
* Input          : - pBuffer : pointer to the buffer  containing the data to be 
*                    written to the FLASH.
*                  - WriteAddr : FLASH's internal address to write to.
*                  - NumByteToWrite : number of bytes to write to the FLASH.
* Output         : None
* Return         : None
*******************************************************************************/
//void SPI_FLASH_BufferWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
//{
//  u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0, temp = 0;
//
//  Addr = WriteAddr % SPI_FLASH_PageSize;
//  count = SPI_FLASH_PageSize - Addr;
//  NumOfPage =  NumByteToWrite / SPI_FLASH_PageSize;
//  NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;
//  
//  if(Addr == 0) /* WriteAddr is SPI_FLASH_PageSize aligned  */
//  {
//    if(NumOfPage == 0) /* NumByteToWrite < SPI_FLASH_PageSize */
//    {
//      SPI_FLASH_SequentialWrite(pBuffer, WriteAddr, NumByteToWrite);
//    }
//    else /* NumByteToWrite > SPI_FLASH_PageSize */ 
//    {
//      while(NumOfPage--)
//      {
//        SPI_FLASH_SequentialWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);
//        WriteAddr +=  SPI_FLASH_PageSize;
//        pBuffer += SPI_FLASH_PageSize;  
//      }    
//     
//      SPI_FLASH_SequentialWrite(pBuffer, WriteAddr, NumOfSingle);
//   }
//  }
//  else /* WriteAddr is not SPI_FLASH_PageSize aligned  */
//  {
//    if(NumOfPage== 0) /* NumByteToWrite < SPI_FLASH_PageSize */
//    {
//      if(NumOfSingle > count) /* (NumByteToWrite + WriteAddr) > SPI_FLASH_PageSize */
//      {
//        temp = NumOfSingle - count;
//      
//        SPI_FLASH_SequentialWrite(pBuffer, WriteAddr, count);
//        WriteAddr +=  count;
//        pBuffer += count; 
//        
//        SPI_FLASH_SequentialWrite(pBuffer, WriteAddr, temp);
//      }
//      else
//      {
//        SPI_FLASH_SequentialWrite(pBuffer, WriteAddr, NumByteToWrite);
//      }
//    }
//    else /* NumByteToWrite > SPI_FLASH_PageSize */
//    {
//      NumByteToWrite -= count;
//      NumOfPage =  NumByteToWrite / SPI_FLASH_PageSize;
//      NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;
//      
//      SPI_FLASH_SequentialWrite(pBuffer, WriteAddr, count);
//      WriteAddr +=  count;
//      pBuffer += count;  
//     
//      while(NumOfPage--)
//      {
//        SPI_FLASH_SequentialWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);
//        WriteAddr +=  SPI_FLASH_PageSize;
//        pBuffer += SPI_FLASH_PageSize;
//      }
//      
//      if(NumOfSingle != 0)
//      {
//        SPI_FLASH_SequentialWrite(pBuffer, WriteAddr, NumOfSingle);
//      }
//    }
//  }
//}

/*******************************************************************************
* Function Name  : SPI_FLASH_BufferRead
* Description    : Reads a block of data from the FLASH.
* Input          : - pBuffer : pointer to the buffer that receives the data read 
*                    from the FLASH.
*                  - ReadAddr : FLASH's internal address to read from.
*                  - NumByteToRead : number of bytes to read from the FLASH.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_BufferRead(u8* pBuffer, u32 ReadAddr, u16 NumByteToRead)