T640_DTU/USER0813/AT25DF .c

#define THIS_FILE_ID 13

#define W25Q32_JEDEC_ID  0xef4016
#define W25Q16_JEDEC_ID		0xef4015
#define AT25DF321_JEDEC_ID	0x1f4701
#define MX25L1606_JEDEC_ID	0xc22015
#define FM25Q32_JEDEC_ID	0xa14016

static const unsigned long listFlashId[]={
	W25Q32_JEDEC_ID,
	W25Q16_JEDEC_ID,
	AT25DF321_JEDEC_ID,
	MX25L1606_JEDEC_ID,
	FM25Q32_JEDEC_ID,
	0
};
static const char *listFlashName[]={
	"W25Q32",
	"W25Q16",
	"AT25DF321",
	"MX25L1606",
	"FM25Q32",
	""
};

#include "includes.h"
//4Kbytes为一个Sector
//16个扇区为1个Block
//W25X16
//容量为2M字节,共有32个Block,512个Sector 

//AT25DF321 上电后 sector protect 默认为使能状态，即SR寄存器SWP(bit3:2)为11b
//先要调用函数进行sector解保护，或者全局解保护后才能写入.
//W25系列上电默认没有软件写保护，故可直接写入

#define sFLASH_CS_PIN                    GPIO_Pin_4                  /* PA.04 */
#define sFLASH_CS_GPIO_PORT              GPIOA                       /* GPIOA */
#define sFLASH_CS_GPIO_CLK               RCC_APB2Periph_GPIOA


#define sFLASH_SPI                       SPI1
#define sFLASH_SPI_CLK                   RCC_APB2Periph_SPI1
#define sFLASH_SPI_SCK_PIN               GPIO_Pin_5                  /* PA.05 */
#define sFLASH_SPI_SCK_GPIO_PORT         GPIOA                       /* GPIOA */
#define sFLASH_SPI_SCK_GPIO_CLK          RCC_APB2Periph_GPIOA
#define sFLASH_SPI_MISO_PIN              GPIO_Pin_6                  /* PA.06 */
#define sFLASH_SPI_MISO_GPIO_PORT        GPIOA                       /* GPIOA */
#define sFLASH_SPI_MISO_GPIO_CLK         RCC_APB2Periph_GPIOA
#define sFLASH_SPI_MOSI_PIN              GPIO_Pin_7                  /* PA.07 */
#define sFLASH_SPI_MOSI_GPIO_PORT        GPIOA                       /* GPIOA */
#define sFLASH_SPI_MOSI_GPIO_CLK         RCC_APB2Periph_GPIOA


//指令表
#define AT25DF_WriteEnable			0x06 
#define AT25DF_WriteDisable			0x04 
#define AT25DF_ReadStatusReg		0x05 
#define AT25DF_WriteStatusReg		0x01 
#define AT25DF_ReadData					0x03 
#define AT25DF_FastReadData			0x0B 
#define AT25DF_FastReadDual			0x3B //??
#define AT25DF_PageProgram			0x02 
#define AT25DF_BlockErase				0x20 //4k-0x20  32k-0x52  64k-0xD8
#define AT25DF_SectorErase			0x20 
#define AT25DF_ChipErase				0xC7 //0x60
#define AT25DF_PowerDown				0xB9 
#define AT25DF_ReleasePowerDown	0xAB 
#define AT25DF_DeviceID					0x9F 
#define AT25DF_UnprotectSector	0x39
#define AT25DF_ProtectSector	  0x36


uint32_t  SPI_Flash_ReadID(void);  	    //读取FLASH ID
u8	SPI_Flash_ReadSR(void);        //读取状态寄存器 
void SPI_FLASH_Write_SR(u8 sr);  	//写状态寄存器
void SPI_FLASH_Write_Enable(void);  //写使能 
void SPI_FLASH_Write_Disable(void);	//写保护
void SPI_Flash_Read(u8* pBuffer,u32 ReadAddr,u16 NumByteToRead);   //读取flash
void SPI_Flash_Write(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite);//写入flash
void SPI_Flash_Erase_Chip(void);    	  //整片擦除
void SPI_Flash_Erase_Sector(u32 Dst_Addr);//扇区擦除
void SPI_Flash_Wait_Busy(void);           //等待空闲
void SPI_Flash_PowerDown(void);           //进入掉电模式
void SPI_Flash_WAKEUP(void);			  //唤醒
void SPI_Flash_Protect_Sector(u32 Dst_Addr);
void SPI_Flash_Unprotect_Sector(u32 Dst_Addr);
void SPI_Flash_Global_Protect(void);
void SPI_Flash_Global_Unprotect(void);
 

u8 SPIx_ReadWriteByte(u8 byte);
/***************************************************************
AT25DF_PortInit
****************************************************************/
void AT25DF_PortInit(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /*!< sFLASH_SPI_CS_GPIO, sFLASH_SPI_MOSI_GPIO, sFLASH_SPI_MISO_GPIO 
	and sFLASH_SPI_SCK_GPIO Periph clock enable */
  RCC_APB2PeriphClockCmd(sFLASH_CS_GPIO_CLK | sFLASH_SPI_MOSI_GPIO_CLK | sFLASH_SPI_MISO_GPIO_CLK |
	sFLASH_SPI_SCK_GPIO_CLK, ENABLE);

  /*!< sFLASH_SPI Periph clock enable */
  RCC_APB2PeriphClockCmd(sFLASH_SPI_CLK, ENABLE);
  
  /*!< Configure sFLASH_SPI pins: SCK */
  GPIO_InitStructure.GPIO_Pin = sFLASH_SPI_SCK_PIN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(sFLASH_SPI_SCK_GPIO_PORT, &GPIO_InitStructure);

  /*!< Configure sFLASH_SPI pins: MOSI */
  GPIO_InitStructure.GPIO_Pin = sFLASH_SPI_MOSI_PIN;
  GPIO_Init(sFLASH_SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);

  /*!< Configure sFLASH_SPI pins: MISO */
  GPIO_InitStructure.GPIO_Pin = sFLASH_SPI_MISO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  
  GPIO_Init(sFLASH_SPI_MISO_GPIO_PORT, &GPIO_InitStructure);
  
  /*!< Configure sFLASH_CS_PIN pin: sFLASH Card CS pin */
  GPIO_InitStructure.GPIO_Pin = sFLASH_CS_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(sFLASH_CS_GPIO_PORT, &GPIO_InitStructure);
}


uint32_t g_ulFlashId;
/***************************************************************
AT25DF_Init
****************************************************************/
int AT25DF_Init(void)
{
	int i;
  SPI_InitTypeDef  SPI_InitStructure;
	printf("sFlash Init...\r\n");
	
  AT25DF_PortInit();
  /*!< Deselect the FLASH: Chip Select high */
  AT25DF_CS_HIGH();

  /*!< SPI 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(sFLASH_SPI, &SPI_InitStructure);

  /*!< Enable the sFLASH_SPI  */
  SPI_Cmd(sFLASH_SPI, ENABLE);
	//
	DelayUs(1000);
	//
	g_ulFlashId=SPI_Flash_ReadID();
	printf("FxF Id=%04x\r\n",g_ulFlashId);
	
	for(i=0;;i++){
		if(g_ulFlashId==listFlashId[i]){
			printf("ExF=%s\r\n",listFlashName[i]);
			return 1;
		}
	}
	printf("ExFlash init error!\r\n");
	return 0;
}  

/**********************************************************************
*
***********************************************************************/

u8 SPIx_ReadWriteByte(u8 byte)
{
 // < Loop while DR register in not emplty 
  while (SPI_I2S_GetFlagStatus(sFLASH_SPI, SPI_I2S_FLAG_TXE) == RESET);

 // !< Send byte through the SPI1 peripheral 
  SPI_I2S_SendData(sFLASH_SPI, byte);

 // !< Wait to receive a byte 
  while (SPI_I2S_GetFlagStatus(sFLASH_SPI, SPI_I2S_FLAG_RXNE) == RESET);

 // !< Return the byte read from the SPI bus 
  return SPI_I2S_ReceiveData(sFLASH_SPI);
}

/*
//SPIx 读写一个字节
//返回值:读取到的字节
u8 SPIx_ReadWriteByte(u8 TxData)
{		
	u8 retry=0;				 
	while((SPI1->SR&1<<1)==0)//等待发送区空	
	{
		retry++;
		if(retry>200)return 0;
	}			  
	SPI1->DR=TxData;	 	  //发送一个byte 
	retry=0;
	while((SPI1->SR&1<<0)==0) //等待接收完一个byte  
	{
		retry++;
		if(retry>200)return 0;
	}	  						    
	return SPI1->DR;          //返回收到的数据				    
}
*/

//读取SPI_FLASH的状态寄存器
//BIT7  6   5   4   3   2   1   0
//SPR   RV  TB BP2 BP1 BP0 WEL BUSY
//SPR:默认0,状态寄存器保护位,配合WP使用
//TB,BP2,BP1,BP0:FLASH区域写保护设置
//WEL:写使能锁定
//BUSY:忙标记位(1,忙;0,空闲)
//默认:0x00
u8 SPI_Flash_ReadSR(void)   
{  
	u8 byte=0;   
	AT25DF_CS_LOW();                            //使能器件   
	SPIx_ReadWriteByte(AT25DF_ReadStatusReg);    //发送读取状态寄存器命令    
	byte=SPIx_ReadWriteByte(0Xff);             //读取一个字节  
	AT25DF_CS_HIGH();                           //取消片选     
	return byte;   
} 
//写SPI_FLASH状态寄存器
//只有SPR,TB,BP2,BP1,BP0(bit 7,5,4,3,2)可以写!!!
void SPI_FLASH_Write_SR(u8 sr)   
{   
	AT25DF_CS_LOW();                            //使能器件   
	SPIx_ReadWriteByte(AT25DF_WriteStatusReg);   //发送写取状态寄存器命令    
	SPIx_ReadWriteByte(sr);               //写入一个字节  
	AT25DF_CS_HIGH();                            //取消片选     	      
}   
//SPI_FLASH写使能	
//将WEL置位   
void SPI_FLASH_Write_Enable(void)   
{
	AT25DF_CS_LOW();                          //使能器件   
    SPIx_ReadWriteByte(AT25DF_WriteEnable);      //发送写使能  
	AT25DF_CS_HIGH();                            //取消片选     	      
} 
//SPI_FLASH写禁止	
//将WEL清零  
void SPI_FLASH_Write_Disable(void)   
{  
	AT25DF_CS_LOW();                           //使能器件   
    SPIx_ReadWriteByte(AT25DF_WriteDisable);     //发送写禁止指令    
	AT25DF_CS_HIGH();                            //取消片选     	      
} 			    


//读取JEDEC ID

uint32_t SPI_Flash_ReadID(void)
{
	 uint32_t Temp = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0;
	AT25DF_CS_LOW();			    
	SPIx_ReadWriteByte(AT25DF_DeviceID);//发送读取ID命令	    	 			   
	Temp0=SPIx_ReadWriteByte(0xFF);  
	Temp1=SPIx_ReadWriteByte(0xFF);	 
	Temp2=SPIx_ReadWriteByte(0xFF);	 
	AT25DF_CS_HIGH();		
  Temp = (Temp0 << 16) | (Temp1 << 8) | Temp2;	
	return Temp;
}



//读取SPI FLASH  
//在指定地址开始读取指定长度的数据
//pBuffer:数据存储区
//ReadAddr:开始读取的地址(24bit)
//NumByteToRead:要读取的字节数(最大65535)
void SPI_Flash_Read(u8* pBuffer,u32 ReadAddr,u16 NumByteToRead)   
{ 
 	u16 i;    												    
	AT25DF_CS_LOW();                           //使能器件   
    //SPIx_ReadWriteByte(AT25DF_ReadData);         //发送读取命令   
	  SPIx_ReadWriteByte(AT25DF_FastReadData);//快速读命令
    SPIx_ReadWriteByte((u8)((ReadAddr)>>16));  //发送24bit地址    
    SPIx_ReadWriteByte((u8)((ReadAddr)>>8));   
    SPIx_ReadWriteByte((u8)ReadAddr);   
	  pBuffer[0]=SPIx_ReadWriteByte(0XFF);//快速读命令丢弃一个字节
    for(i=0;i<NumByteToRead;i++)
	{ 
        pBuffer[i]=SPIx_ReadWriteByte(0XFF);   //循环读数  
    }
	AT25DF_CS_HIGH();                            //取消片选     	      
}  
//SPI在一页(0~65535)内写入少于256个字节的数据
//在指定地址开始写入最大256字节的数据
//pBuffer:数据存储区
//WriteAddr:开始写入的地址(24bit)
//NumByteToWrite:要写入的字节数(最大256),该数不应该超过该页的剩余字节数!!!	 
void SPI_Flash_Write_Page(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)
{
 	u16 i;  
    SPI_FLASH_Write_Enable();                  //SET WEL 
	AT25DF_CS_LOW();                           //使能器件   
    SPIx_ReadWriteByte(AT25DF_PageProgram);      //发送写页命令   
    SPIx_ReadWriteByte((u8)((WriteAddr)>>16)); //发送24bit地址    
    SPIx_ReadWriteByte((u8)((WriteAddr)>>8));   
    SPIx_ReadWriteByte((u8)WriteAddr);   
    for(i=0;i<NumByteToWrite;i++) SPIx_ReadWriteByte(pBuffer[i]);//循环写数  
	AT25DF_CS_HIGH();                           //取消片选 
	SPI_Flash_Wait_Busy();					   //等待写入结束
} 
//无检验写SPI FLASH 
//必须确保所写的地址范围内的数据全部为0XFF,否则在非0XFF处写入的数据将失败!
//具有自动换页功能 
//在指定地址开始写入指定长度的数据,但是要确保地址不越界!
//pBuffer:数据存储区
//WriteAddr:开始写入的地址(24bit)
//NumByteToWrite:要写入的字节数(最大65535)
//CHECK OK
void SPI_Flash_Write_NoCheck(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)   
{ 			 		 
	u16 pageremain;	   
	pageremain=256-WriteAddr%256; //单页剩余的字节数		 	    
	if(NumByteToWrite<=pageremain)pageremain=NumByteToWrite;//不大于256个字节
	while(1)
	{	   
		SPI_Flash_Write_Page(pBuffer,WriteAddr,pageremain);
		if(NumByteToWrite==pageremain)break;//写入结束了
	 	else //NumByteToWrite>pageremain
		{
			pBuffer+=pageremain;
			WriteAddr+=pageremain;	

			NumByteToWrite-=pageremain;			  //减去已经写入了的字节数
			if(NumByteToWrite>256)pageremain=256; //一次可以写入256个字节
			else pageremain=NumByteToWrite; 	  //不够256个字节了
		}
	};	    
} 
//写SPI FLASH  
//在指定地址开始写入指定长度的数据
//该函数带擦除操作!
//pBuffer:数据存储区
//WriteAddr:开始写入的地址(24bit)
//NumByteToWrite:要写入的字节数(最大65535)  		   
u8 SPI_FLASH_BUF[4096];
void SPI_Flash_Write(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)   
{ 
	u32 secpos;
	u16 secoff;
	u16 secremain;	   
 	u16 i;  
	secpos=WriteAddr/4096;//扇区地址 0~511 for w25x16
	secoff=WriteAddr%4096;//在扇区内的偏移
	secremain=4096-secoff;//扇区剩余空间大小   
	if(NumByteToWrite<=secremain)secremain=NumByteToWrite;//不大于4096个字节
	while(1) 
	{	
		SPI_Flash_Read(SPI_FLASH_BUF,secpos*4096,4096);//读出整个扇区的内容
		for(i=0;i<secremain;i++)//校验数据
		{
			if(SPI_FLASH_BUF[secoff+i]!=0XFF)break;//需要擦除  	  
		}
		if(i<secremain)//需要擦除
		{
			SPI_Flash_Erase_Sector(secpos);//擦除这个扇区
			for(i=0;i<secremain;i++)	   //复制
			{
				SPI_FLASH_BUF[i+secoff]=pBuffer[i];	  
			}
			SPI_Flash_Write_NoCheck(SPI_FLASH_BUF,secpos*4096,4096);//写入整个扇区  

		}else SPI_Flash_Write_NoCheck(pBuffer,WriteAddr,secremain);//写已经擦除了的,直接写入扇区剩余区间. 				   
		if(NumByteToWrite==secremain)break;//写入结束了
		else//写入未结束
		{
			secpos++;//扇区地址增1
			secoff=0;//偏移位置为0 	 

		   	pBuffer+=secremain;  //指针偏移
			WriteAddr+=secremain;//写地址偏移	   
		   	NumByteToWrite-=secremain;				//字节数递减
			if(NumByteToWrite>4096)secremain=4096;	//下一个扇区还是写不完
			else secremain=NumByteToWrite;			//下一个扇区可以写完了
		}	 
	}	 	 
}

//擦除整个芯片
//整片擦除时间:
//W25X16:25s 
//W25X32:40s 
//W25X64:40s 
//等待时间超长...
void SPI_Flash_Erase_Chip(void)   
{        
	SPI_Flash_Wait_Busy();  	
	SPI_FLASH_Write_Enable();                  //SET WEL 
	SPI_Flash_Wait_Busy();   
	AT25DF_CS_LOW();                           //使能器件   
	SPIx_ReadWriteByte(AT25DF_ChipErase);        //发送片擦除命令  
	AT25DF_CS_HIGH();                            //取消片选     	      
	SPI_Flash_Wait_Busy();   				   //等待芯片擦除结束
}   
//擦除一个扇区
//Dst_Addr:扇区地址 0~511 for w25x16
//擦除一个扇区的最少时间:150ms
void SPI_Flash_Erase_Sector(u32 Dst_Addr)   
{   
	Dst_Addr*=4096;
    SPI_FLASH_Write_Enable();                  //SET WEL 	 
    SPI_Flash_Wait_Busy();   
  	AT25DF_CS_LOW();                           //使能器件
    SPIx_ReadWriteByte(AT25DF_SectorErase);      //发送扇区擦除指令 
    SPIx_ReadWriteByte((u8)((Dst_Addr)>>16));  //发送24bit地址    
    SPIx_ReadWriteByte((u8)((Dst_Addr)>>8));
    SPIx_ReadWriteByte((u8)Dst_Addr);  
	AT25DF_CS_HIGH();                          //取消片选     	      
    SPI_Flash_Wait_Busy();   				   //等待擦除完成
}  

//保护一个扇区
//Dst_Addr:扇区地址 0~511 for w25x16
//AT25DF_ProtectSector
void SPI_Flash_Protect_Sector(u32 Dst_Addr)   
{   
	if(AT25DF321_JEDEC_ID==g_ulFlashId){
		Dst_Addr*=4096;
		SPI_FLASH_Write_Enable();                  //SET WEL 	 
		SPI_Flash_Wait_Busy();   
		AT25DF_CS_LOW();                           //使能器件   
		SPIx_ReadWriteByte(AT25DF_ProtectSector);      //发送扇区解保护指令 
		SPIx_ReadWriteByte((u8)((Dst_Addr)>>16));  //发送24bit地址    
		SPIx_ReadWriteByte((u8)((Dst_Addr)>>8));   
		SPIx_ReadWriteByte((u8)Dst_Addr);  
		AT25DF_CS_HIGH();                          //取消片选     	   
	}else if(W25Q16_JEDEC_ID==g_ulFlashId){
	
	}else if(MX25L1606_JEDEC_ID==g_ulFlashId)	{
		
	}		
} 

//解保护一个扇区
//Dst_Addr:扇区地址 0~511 for w25x16
//AT25DF_UnprotectSector
void SPI_Flash_Unprotect_Sector(u32 Dst_Addr)   
{   
	if(AT25DF321_JEDEC_ID==g_ulFlashId){
		Dst_Addr*=4096;
		SPI_FLASH_Write_Enable();                  //SET WEL 	 
		SPI_Flash_Wait_Busy();   
		AT25DF_CS_LOW();                           //使能器件   
		SPIx_ReadWriteByte(AT25DF_UnprotectSector);      //发送扇区解保护指令 
		SPIx_ReadWriteByte((u8)((Dst_Addr)>>16));  //发送24bit地址    
		SPIx_ReadWriteByte((u8)((Dst_Addr)>>8));   
		SPIx_ReadWriteByte((u8)Dst_Addr);  
		AT25DF_CS_HIGH();                          //取消片选  
	}else if(W25Q16_JEDEC_ID==g_ulFlashId){
		//SPI_FLASH_Write_Enable();                  //SET WEL 	 
		//SPI_Flash_Wait_Busy();   
		//SPI_FLASH_Write_SR(0x00);    	  
	}else if(MX25L1606_JEDEC_ID==g_ulFlashId){
	}
} 

//保护全芯片
//
//
void SPI_Flash_Global_Protect(void)   
{   
	
	if(AT25DF321_JEDEC_ID==g_ulFlashId){
		SPI_FLASH_Write_Enable();                  //SET WEL 	 
		SPI_Flash_Wait_Busy();   
		SPI_FLASH_Write_SR(0x3c);    	    
	}else if(W25Q16_JEDEC_ID==g_ulFlashId){
		SPI_FLASH_Write_Enable();                  //SET WEL 	 
		SPI_Flash_Wait_Busy();   
		SPI_FLASH_Write_SR(0x18);    	
	}else if(MX25L1606_JEDEC_ID==g_ulFlashId){
		SPI_FLASH_Write_Enable();                  //SET WEL 	 
		SPI_Flash_Wait_Busy();   
		SPI_FLASH_Write_SR(0x18); 
	}		
} 

//解保护全芯片
//
//
void SPI_Flash_Global_Unprotect(void)   
{   
		if(W25Q16_JEDEC_ID==g_ulFlashId){
			SPI_FLASH_Write_Enable();                  //SET WEL 	 
			SPI_Flash_Wait_Busy();   
			SPI_FLASH_Write_SR(0x00);    	
			SPI_Flash_Wait_Busy();   
		}else if(MX25L1606_JEDEC_ID==g_ulFlashId){
			SPI_FLASH_Write_Enable();                  //SET WEL 	 
			SPI_Flash_Wait_Busy();   
			SPI_FLASH_Write_SR(0x00);    	
			SPI_Flash_Wait_Busy();  
		}else if(FM25Q32_JEDEC_ID==g_ulFlashId){
			SPI_FLASH_Write_Enable();                  //SET WEL 	 
			SPI_Flash_Wait_Busy();   
			SPI_FLASH_Write_SR(0x00);    	
			SPI_Flash_Wait_Busy();  
		}

} 

//等待空闲
void SPI_Flash_Wait_Busy(void)   
{   
	while ((SPI_Flash_ReadSR()&0x01)==0x01){		// 等待BUSY位清空
		IWDG_ReloadCounter();//喂狗
	}
}  
//进入掉电模式
void SPI_Flash_PowerDown(void)   
{ 
	AT25DF_CS_LOW();                           //使能器件   
	SPIx_ReadWriteByte(AT25DF_PowerDown);        //发送掉电命令  
	AT25DF_CS_HIGH();                            //取消片选     	      
	DelayUs(3);                               //等待TPD  
}   
//唤醒
void SPI_Flash_WAKEUP(void)   
{  
	AT25DF_CS_LOW();                            //使能器件   
	SPIx_ReadWriteByte(AT25DF_ReleasePowerDown);   //  send AT25DF_PowerDown command 0xAB    
	AT25DF_CS_HIGH();                            //取消片选     	      
	DelayUs(3);                               //等待TRES1
}


/*********************************************
*
***********************************************/
void AT25DFTest(void)
{
	uint32_t sFlashId;
  unsigned char sFlashSR;
	static int scStep;
	unsigned char t;
	char buf[200];

  //SPI_Flash_Global_Protect();
  //SPI_Flash_Global_Unprotect();

	
	
	switch(scStep){
		case 0:
			sFlashId=SPI_Flash_ReadID();
			sprintf(buf,"FID=%04x\r\n",sFlashId);
			SlwTrace(INF,buf);
			break;
		case 1:
			strcpy(buf,"-------------good night--------\r\n");
			//SPI_Flash_Unprotect_Sector(0);//解扇区软件保护
			SPI_Flash_Write((unsigned char *)buf,256,strlen(buf));
			//SPI_Flash_Protect_Sector(0);
			strcpy(buf,"===TestWriteFail!===============\r\n");
			
			break;
		case 2:
			SPI_Flash_Read((unsigned char *)buf,256,sizeof(buf));
			buf[sizeof(buf)-1]=0;
			SlwTrace(INF,buf);
			break;
		case 3:
			sFlashSR = SPI_Flash_ReadSR();
			sprintf(buf, "FSR=%04x\r\n", sFlashSR);
			SlwTrace(INF,buf);	
			break;
	}
	if(++scStep>3)scStep=0;
	
}