drive.c

nandflash的驱动,带有测试程序,可以单独运行.当然是在有硬件的情况下.

#include "stdio.h"
#include "nand.h"

/****************** 延时子程序 ******************/
void FlashDelay(int FlashDelay)                         //用于适应芯片的时序                               
{
	int i;
	for(i=0;i<FlashDelay;i++);
}

/****************** 与Flash有关的硬件初始化子程序 ******************/
void HwInitForFlash(void)
{
	Mcfg1=Mcfg1|0x00080000;			/* I/O_0 Enable 即选定i/o_0空间的寄存器,应和接线有关*/
	Mcfg1=Mcfg1&0xe7ffffff;			/* I/O bus width =8 即设定总线的宽度,nand芯片以是8位数据进行读写的*/
	Gpio0Dir=Gpio0Dir|0x00003800;	/* Gpio0[11],Gpio0[12],Gpio0[13] is output 即设定GPIO口的*/
	Gpio0Dir=Gpio0Dir&0xffff3fff;
	FlashCeDis();
	FlashCleDis();
	FlashAleDis();
}

/****************** Flash控制子程序 ******************/
void FlashCeEn(void)
{
	Gpio0Data=Gpio0Data&0xffffdfff;                 //第13位
}
void FlashCeDis(void)
{
	Gpio0Data=Gpio0Data|0x00002000;
}
void FlashCleEn(void)
{
	Gpio0Data=Gpio0Data|0x00001000;              	//第12位
}
void FlashCleDis(void)
{
	Gpio0Data=Gpio0Data&0xffffefff;
}
void FlashAleEn(void)
{
	Gpio0Data=Gpio0Data|0x00000800;            		//第11位
}
void FlashAleDis(void)
{
	Gpio0Data=Gpio0Data&0xfffff7ff;
}

/****************** 读Flash ID子程序 ******************/
unsigned int FlashIdRead(void)
{
	unsigned char i;
	unsigned int j=0;
	
	FlashCeEn();
	FlashCleEn();
	FlashAddr=0x90;
	FlashCleDis();
	FlashAleEn();
	FlashAddr=0x00;
	FlashAleDis();
 
	i=FlashAddr; printf("i=%x",i);
	j=FlashAddr;  printf("\n j=%x\n",j);
	FlashCeDis();
	j=j<<8;          
	j=j+i;  printf("second j=%x\n",j);
	return(j);
}

 

/****************** Flash初始化子程序 ******************/
/*程序中在使用nandFlash前必须对nandFlash进行一次初始化。返回值："0"：成功；"非0"：不成功*/
unsigned char FlashInit(void)
{
	unsigned int i;
	
	i=FlashIdRead();
	if(i==0x75ec)
		return(0);
	else
		return(1);
		
 
}

/****************** 擦删Flash的Block子程序 ******************/
unsigned char FlashBlockErase(unsigned long Address)
{
	unsigned char A9_16,A17_24,Status;
	
	A9_16=(unsigned char)(Address&0x000000ff);
	A17_24=(unsigned char)((Address&0x0000ff00)>>8);
	Status=0x00;
	
	FlashCeEn();
	FlashCleEn();
	FlashAddr=0x60;
	FlashCleDis();
	FlashAleEn();
	FlashAddr=A9_16;
	FlashAddr=A17_24;
	FlashAleDis();
	FlashCleEn();
	FlashAddr=0xd0;
	FlashCleDis();
	FlashDelay(10);		/*delay 3ms*/
	while((Status&0x40)==0x00)
	{
		FlashCleEn();
		FlashAddr=0x70;
		FlashCleDis();
		Status=FlashAddr;
	}
	FlashCleEn();
	FlashAddr=0x70;
	FlashCleDis();
	Status=FlashAddr;
	FlashCeDis();
	Status=Status&0x01;
	return(Status);
}

/****************** 向Flash中写入指定长度数据子程序 ******************/
/*所写的地址空间必须在同一Page中*/
/*Address：指定写入数据的nandFlash线性地址起始位置, Length：指定写入数据的长度,
  Buf：存储要写入nandFlash数据的数据缓冲区, 返回值："0"：成功；"非0"：不成功*/
unsigned char FlashWrite(unsigned long Address,unsigned int Length,unsigned char *Buf)
{
	unsigned char A0_7,A8,A9_16,A17_24,Status;
        unsigned int i;
		
	A0_7=(unsigned char)(Address&0x000000ff);
	A8=(unsigned char)((Address&0x00000100)>>8);
	A9_16=(unsigned char)((Address&0x0001fe00)>>9);
	A17_24=(unsigned char)((Address&0x01fe0000)>>17);
	Status=0x00;
	
	FlashCeEn();
	FlashCleEn();
	if (A8)
		FlashAddr=0x01;
	else
		FlashAddr=0x00;
	FlashAddr=0x80;
	FlashCleDis();
	FlashAleEn();
	FlashAddr=A0_7;
	FlashAddr=A9_16;
	FlashAddr=A17_24;
	FlashAleDis();            
	for(i=0;i<Length;i++)
          {		FlashAddr=Buf[i]; 
 
          }printf("*****ok****\n");
	FlashCleEn();
	FlashAddr=0x10;
 
	FlashDelay(2);		/*delay 500us*/
	while((Status&0x40)==0x00)
	{
		FlashCleEn();
		FlashAddr=0x70;
		FlashCleDis();
		Status=FlashAddr;
	}

 
	FlashAddr=0x70;
	FlashCleDis();                          
	Status=FlashAddr;
	FlashCeDis();
	Status=Status&0x01;
	return(Status);
}

/****************** 从Flash中读出指定长度的数据子程序 ******************/
/*所读的地址空间必须在同一Page中*/
/*Address：指定读出数据的nandFlash线性地址起始位置, Length：指定读出数据的长度,
  Buf：存储从nandFlash读出的数据, 返回值："0"：成功；"非0"：不成功*/
void FlashRead(unsigned long Address,unsigned int Length,unsigned char * Buf)
{
	unsigned char A0_7,A8,A9_16,A17_24,i;
		
	A0_7=(unsigned char)(Address&0x000000ff);
	A8=(unsigned char)((Address&0x00000100)>>8);
	A9_16=(unsigned char)((Address&0x0001fe00)>>9);
	A17_24=(unsigned char)((Address&0x01fe0000)>>17);
		
	FlashCeEn();
	FlashCleEn();
	if (A8)
		FlashAddr=0x01;
	else
		FlashAddr=0x00;
	FlashCleDis();
	FlashAleEn();
	FlashAddr=A0_7;
	FlashAddr=A9_16;
	FlashAddr=A17_24;
	FlashAleDis();
	FlashDelay(1);							/*delay 10us*/
	for(i=0;i<Length;i++)
		Buf[i]=FlashAddr;
	FlashCeDis();
}

void Flash_C_Read(unsigned long Address,unsigned int Length,unsigned char *Buf)
{
  unsigned char A0_3=0,A8,A9_16=0,A17_24=0,i;
  
  A0_3=(unsigned char)(Address&0x0000000f);
  A9_16=(unsigned char)((Address&0x0001fe00)>>9);
  A17_24=(unsigned char)((Address&0x01fe0000)>>17);

  FlashCeEn();
  FlashCleEn();
  FlashAddr=0x50;
  FlashCleDis();
  FlashAleEn();
  FlashAddr=A0_3;
  FlashAddr=A9_16;
  FlashAddr=A17_24;
  FlashAleDis();
  FlashDelay(1);                             //delay 10us
  for(i=0;i<Length;i++)
     Buf[i]=FlashAddr;
  FlashCeDis();
  
}

int isInvalid(unsigned int blocknum)
{
   unsigned int Addr=0;
   unsigned char buf[16];
   int i;
   for(i=0;i<2;i++)
    {
      Addr=blocknum<<5+i;
      Addr=Addr<<9+5;
      Flash_C_Read(Addr,16,buf);
      if(buf[5]!=0xff)
         return 1;
      Addr=0;
	 
    }return 0;
}