at45spiflash.c

通过SPI接口写FLASH

* Description    : Erases the specified FLASH sector.
* Input          : SectorAddr: address of the sector to erase.
* 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();
}


//擦除指定的主存储器页（地址范围0-4095）
void DF_page_earse(unsigned int page)
{

	DF_wait_busy();
	
	SPI_FLASH_CS_LOW();
	SPI_FLASH_SendByte(PAGE_ERASE);
	SPI_FLASH_SendByte((unsigned char)(page >> 6));
	SPI_FLASH_SendByte((unsigned char)(page << 2));
	SPI_FLASH_SendByte(0x00);
	SPI_FLASH_CS_HIGH();

}


//将保存在数组DF_buffer[]中的一页数据写入第二缓冲区后送入主存储区
//（先擦除后写入模式，页地址范围0-4095）
void DF_write_page(u8* pBuffer,u16 page)
{
	unsigned int i;
	
	DF_wait_busy();
	SPI_FLASH_CS_LOW();
	SPI_FLASH_SendByte(BUFFER_2_WRITE);
	SPI_FLASH_SendByte(0x00);
	SPI_FLASH_SendByte(0x00);
	SPI_FLASH_SendByte(0x00);
	for (i=0;i<SPI_FLASH_PageSize;i++)
	{
		SPI_FLASH_SendByte(*pBuffer);
		pBuffer++;
	}
	SPI_FLASH_CS_HIGH();
	
	if (page<4096)
	{
		SPI_FLASH_CS_LOW();
		SPI_FLASH_SendByte(B2_TO_MM_PAGE_PROG_WITH_ERASE);
		SPI_FLASH_SendByte((unsigned char)(page>>6));
		SPI_FLASH_SendByte((unsigned char)(page<<2));
		SPI_FLASH_SendByte(0x00);
		SPI_FLASH_CS_HIGH();
		DF_wait_busy();
	}

}


//将指定主存储器页的数据转入第一缓冲区后读出，保存在DF_buffer[]数组中
//（页地址范围0-4095）
void DF_read_page	(u8* pBuffer,u16 page)
{
	unsigned int i;
	
//	while(!(DF_STA_PORT & (1<< DF_STATE)));
	DF_wait_busy();
	SPI_FLASH_CS_LOW();
	SPI_FLASH_SendByte(MM_PAGE_TO_B1_XFER);
	SPI_FLASH_SendByte((unsigned char)(page >> 6));
    SPI_FLASH_SendByte((unsigned char)(page << 2));
    SPI_FLASH_SendByte(0x00);
	SPI_FLASH_CS_HIGH();
	
	DF_wait_busy();
	SPI_FLASH_CS_LOW();
	SPI_FLASH_SendByte(BUFFER_1_READ); 
	SPI_FLASH_SendByte(0x00);                        
	SPI_FLASH_SendByte(0x00);   
	SPI_FLASH_SendByte(0x00);        
	SPI_FLASH_SendByte(0x00);
	for (i=0;i<SPI_FLASH_PageSize;i++)
	{
		
		*pBuffer = 	SPI_FLASH_ReadByte(0xFF);
		pBuffer++;
	}
	SPI_FLASH_CS_HIGH();
	
}


//以直接读取方式读取指定的主存储器页数据（页地址范围0-4095）


//读取状态寄存器
//	bit7		bit6	bit6	bit6	bit6	bit6	bit6		bit6
//RDY/BUSY		COMP	1		0		1		1		PROTECT		PAGE SIZE	
unsigned char DF_read_reg(void)
{
	unsigned char temp;

	SPI_FLASH_CS_LOW();
	SPI_FLASH_SendByte(READ_STATE_REGISTER);
	SPI_FLASH_SendByte(0x00);
	SPI_FLASH_SendByte(0x00);                        
	SPI_FLASH_SendByte(0x00);   
	
	temp= SPI_FLASH_ReadByte(0x00);
	SPI_FLASH_CS_HIGH();

	return temp;
}


//检查状态寄存器最高位是否为忙，并等待空闲
void DF_wait_busy(void)
{
	unsigned char state_reg=0x00;
	SPI_FLASH_CS_LOW();
	SPI_FLASH_SendByte(READ_STATE_REGISTER);
	SPI_FLASH_SendByte(0x00);
	SPI_FLASH_SendByte(0x00);                        
	SPI_FLASH_SendByte(0x00);
	while((state_reg&0x80) == 0)
	{
		
		state_reg =  SPI_FLASH_ReadByte(0x00);
	}
	SPI_FLASH_CS_HIGH();
}


//将指定主存储器页的数据转入指定缓冲区
void DF_mm_to_buf(unsigned char buffer,unsigned int page)
{

	DF_wait_busy();
	SPI_FLASH_CS_LOW();
	if (buffer==1)
		SPI_FLASH_SendByte(MM_PAGE_TO_B1_XFER);
	else
		SPI_FLASH_SendByte(MM_PAGE_TO_B2_XFER);
	SPI_FLASH_SendByte((unsigned char)(page >> 6));
    SPI_FLASH_SendByte((unsigned char)(page << 2));
    SPI_FLASH_SendByte(0x00);
	SPI_FLASH_CS_HIGH();

}


//读取指定缓冲区指定单元的数据，保存在DF_buffer[]数组中
u8 DF_read_buf(u8 buffer,u16 start_address,u16 length,u8* pBuffer)
{
	unsigned int i;
	if ((SPI_FLASH_PageSize-start_address)>=length)
	{
		DF_wait_busy();
		SPI_FLASH_CS_LOW();
		if (buffer==1)
			SPI_FLASH_SendByte(BUFFER_1_READ); 
		else
			SPI_FLASH_SendByte(BUFFER_2_READ);
		SPI_FLASH_SendByte(0x00);                        
		SPI_FLASH_SendByte((unsigned char)(start_address >> 8));   
		SPI_FLASH_SendByte((unsigned char)start_address);        
		SPI_FLASH_SendByte(0x00);
		for (i=0;i<length;i++)
		{
			*pBuffer = 	SPI_FLASH_ReadByte(0xFF);
			pBuffer++;
		}
		SPI_FLASH_CS_HIGH();
		return 1;
	}
	else
		return 0;
}


//将DF_buffer[]数组中指定长度的数据写入指定缓冲区
u8 DF_write_buf(u8 buffer,u16 start_address,u16 length,u8* pBuffer)
{
	unsigned int i;
	if  ((SPI_FLASH_PageSize-start_address)>=length)
	{
		DF_wait_busy();
		SPI_FLASH_CS_LOW();
		if (buffer==1)
			SPI_FLASH_SendByte(BUFFER_1_WRITE);
		else
			SPI_FLASH_SendByte(BUFFER_2_WRITE);
		SPI_FLASH_SendByte(0x00);
		SPI_FLASH_SendByte((unsigned char)(start_address >> 8));   
		SPI_FLASH_SendByte((unsigned char)start_address);
		for (i=0;i<length;i++)
			{SPI_FLASH_SendByte(*pBuffer);pBuffer++;}
		SPI_FLASH_CS_HIGH();
		return 1;
	}
	else
		return 0;
}


//将指定缓冲区中的数据写入主存储区的指定页
void DF_buf_to_mm(unsigned char buffer,unsigned int page)
{
	DF_wait_busy();
	if (page<4096)
	{
		SPI_FLASH_CS_LOW();
		if (buffer==1)
			SPI_FLASH_SendByte(B1_TO_MM_PAGE_PROG_WITH_ERASE);
		else
			SPI_FLASH_SendByte(B2_TO_MM_PAGE_PROG_WITH_ERASE);
		SPI_FLASH_SendByte((unsigned char)(page>>6));
		SPI_FLASH_SendByte((unsigned char)(page<<2));
		SPI_FLASH_SendByte(0x00);
		SPI_FLASH_CS_HIGH();
	}
}


/*******************************************************************************
* Function Name  : SPI_FLASH_ReadID
* Description    : Reads FLASH identification.
* Input          : None
* Output         : None
* Return         : FLASH identification
*******************************************************************************/
u32 SPI_FLASH_ReadID(void)
{
  u32 Temp = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0;

  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();

  /* Send "RDID " instruction */
  SPI_FLASH_SendByte(0x9F);

  /* Read a byte from the FLASH */
  Temp0 = SPI_FLASH_SendByte(Dummy_Byte1);
  // printf("\nTemp0  %x",Temp0);
  /* Read a byte from the FLASH */
  Temp1 = SPI_FLASH_SendByte(Dummy_Byte1);
   // printf("\nTemp1  %x",Temp1);
  /* Read a byte from the FLASH */
  Temp2 = SPI_FLASH_SendByte(Dummy_Byte1);
   // printf("\nTemp2  %x",Temp2);
  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();

  Temp = (Temp0 << 16) | (Temp1 << 8) | Temp2;

  return Temp;
}