?? nand.c
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/**************************************************
** 文件名:nand.c
** 版本號:V 1.0
** 文件說明:實現(xiàn)對Nand Flash的操作
***************************************************/
/*
support 512 page and 2048 page NAND Flash
*/
#include "config.h"
#include "Nand.h"
//
// Reset the chip
//
static void rNF_Reset()
{
NF_CE_L();
NF_CLEAR_RB();
NF_CMD(CMD_RESET);
NF_DETECT_RB();
NF_CE_H();
}
static void rNF_Init(void)
{
rNFCONF = (TACLS<<12)|(TWRPH0<<8)|(TWRPH1<<4)|(0<<0);
rNFCONT = (0<<13)|(0<<12)|(0<<10)|(0<<9)|(0<<8)|(1<<6)|(1<<5)|(1<<4)|(1<<1)|(1<<0);
rNFSTAT = 0;
rNF_Reset();
}
static char rNF_ReadID()
{
char pMID;
char pDID;
char nBuff;
char n4thcycle;
int i;
NF_nFCE_L();
NF_CLEAR_RB();
NF_CMD(CMD_READID); // read id command
NF_ADDR(0x0);
for ( i = 0; i < 100; i++ );
pMID = NF_RDDATA8();
pDID = NF_RDDATA8();
nBuff = NF_RDDATA8();
n4thcycle = NF_RDDATA8();
NF_nFCE_H();
return (pDID);
}
static void rSB_ReadPage(U32 addr, unsigned char * to)
{
U32 i;
rNF_Reset();
// Enable the chip
NF_nFCE_L();
NF_CLEAR_RB();
// Issue Read command
NF_CMD(CMD_READ);
// Set up address
NF_ADDR(0x00);
NF_ADDR((addr) & 0xff);
NF_ADDR((addr >> 8) & 0xff);
NF_ADDR((addr >> 16) & 0xff);
NF_DETECT_RB(); // wait tR(max 12us)
for (i = 0; i < 512; i++)
{
to[i] = NF_RDDATA8();
}
NF_nFCE_H();
}
static void rLB_ReadPage(U32 addr, unsigned char * to)
{
U32 i;
rNF_Reset();
// Enable the chip
NF_nFCE_L();
NF_CLEAR_RB();
// Issue Read command
NF_CMD(CMD_READ);
// Set up address
NF_ADDR(0x00);
NF_ADDR(0x00);
NF_ADDR((addr) & 0xff);
NF_ADDR((addr >> 8) & 0xff);
NF_ADDR((addr >> 16) & 0xff);
NF_CMD(CMD_READ3);
NF_DETECT_RB(); // wait tR(max 12us)
for (i = 0; i < 2048; i++)
{
to[i] = NF_RDDATA8();
}
NF_nFCE_H();
}
void RdNF2SDRAM( )
{
U32 i;
U32 start_addr = 0x0;
unsigned char * to = (unsigned char *)0x30000000;
U32 size = 0x200000;
rNF_Init();
switch(rNF_ReadID())
{
case 0x76:
for(i = (start_addr >> 9); size > 0; )
{
rSB_ReadPage(i, to);
size -= 512;
to += 512;
i ++;
}
break;
case 0xf1:
case 0xda:
case 0xdc:
case 0xd3:
for(i = (start_addr >> 11); size > 0; )
{
rLB_ReadPage(i, to);
size -= 2048;
to += 2048;
i ++;
}
break;
}
}
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