nandflash.c

44BO 的UCGUI包

/*
 * Module: NandFlash.c 		NAND FLASH基本驱动子程序模块
 * Programed by: ZHI-XIONG PENG
 * Programed on: Date: 2005-4-28 10:30
 * Modified  by:
 * Modified  on: Date:
 * Copyright (c) LONGFLY SHAOGUAN Inc. All rights reserved
 */

#define		NANDFLASH_GLOBALS

#include 	"./SRC/includes.h"

//============================================================
//* 函数介绍：延时( 最少单位时间1.4uS )
//* 参数列表：dly 延时单位
//* 返回值  ：无
//* 全局变量:
//* 调用模块:
//============================================================
void	LoopNop( uint dly )
{
	uint 	i;

	while( dly-- )
	{
		i = MCKMHZ * 0.1 + 1;	//47 Cycles
		while( i-- );
	}
}

//============================================================
//* 函数介绍：获取ID
//* 参数列表：无
//* 返回值  ：0 失败 非零为芯片ID（高位为:Maker Code 低位为:Device Code）
//*				0xECE6-K9F6408 0xECE3-K9F3208 0xECEA-K9F1608
//* 全局变量:
//* 调用模块:
//============================================================
uint	R_NandFlash_ID(void)
{
	volatile	char	*pflash;
	uint	id;

	pflash = (char *)NANDFCE;
	*pflash = 0x01;

	pflash = (char *)NANDFORD;
	*pflash = 0x90;

	pflash = (char *)NANDFADDR;
	*pflash = 0x00;

	pflash = (char *)NANDFLASH;
	id = *pflash;
	id = (id<<8) | *pflash;

	pflash = (char *)NANDFCE;
	*pflash = 0x00;

	return( id );
}

//============================================================
//* 函数介绍：读一个页面
//* 参数列表：addr 待读数据的FLASH页地址
//*			  data 数据输出缓冲区指针 缓冲区长度必须至少保证能够存储一页数据：528/264
//* 返回值  ：0 失败 非零成功（返回值为数据长度）
//* 全局变量:
//* 调用模块:
//============================================================
uint	R_NandFlash_Page( uint addr, char *data )
{
	AT91PS_PIO 	pPio;
	volatile	char		*pflash;
	uint		i;

	pPio	= AT91C_BASE_PIO;
    pPio->PIO_ODR = NANDFR_B;

	pflash = (char *)NANDFCE;
	*pflash = 0x01;

	pflash = (char *)NANDFORD;
	*pflash = 0x00;
	pflash = (char *)NANDFADDR;
	*pflash = 0x00;
	*pflash = addr&0xff;
	*pflash = addr/0x100;

	for( i=0; i<3; i++ )
	{
		LoopNop( 10 );	//Delay 15us
		if( pPio->PIO_PDSR & NANDFR_B )
			break;
	}
	if( i == 3 )
		return( 0 );

	pflash = (char *)NANDFLASH;
	for( i=0; i<NandPageSize; i++ )
		*data++ = *pflash;

	pflash = (char *)NANDFCE;
	*pflash = 0x00;

	return( NandPageSize );
}

//============================================================
//* 函数介绍：写一个页面
//* 参数列表：addr 待写数据的FLASH页地址
//*			  data 数据缓冲区指针 缓冲区长度必须至少保证能够存储一页数据：528/264
//* 返回值  ：0成功  非零失败
//* 全局变量:
//* 调用模块:
//============================================================
uint	W_NandFlash_Page( uint addr, char *data )
{
	AT91PS_PIO 	pPio;
	volatile	char		*pflash;
	uint		i;

	pPio	= AT91C_BASE_PIO;
    pPio->PIO_ODR = NANDFR_B;

	pflash = (char *)NANDFCE;
	*pflash = 0x01;

	pflash = (char *)NANDFORD;
	*pflash = 0x80;
	pflash = (char *)NANDFADDR;
	*pflash = 0x00;
	*pflash = addr&0xff;
	*pflash = addr/0x100;

	pflash = (char *)NANDFLASH;
	for( i=0; i<NandPageSize; i++ )
		*pflash = *data++;

	pflash = (char *)NANDFORD;
	*pflash = 0x10;

	for( i=0; i<12; i++ )
	{
		LoopNop( 100 );	//Delay 150us
		if( pPio->PIO_PDSR & NANDFR_B )
			break;
	}

	if( i < 12 )
	{
		pflash = (char *)NANDFORD;
		*pflash = 0x70;
		pflash = (char *)NANDFLASH;
		i = *pflash & 1;
	}

	pflash = (char *)NANDFCE;
	*pflash = 0x00;

	return( i );
}

//============================================================
//* 函数介绍：擦除一个块
//* 参数列表：addr 擦除块的首页地址
//* 返回值  ：0成功  非零失败
//* 全局变量:
//* 调用模块:
//============================================================
uint	E_NandFlash_Block( uint addr )
{
	AT91PS_PIO 	pPio;
	volatile	char		*pflash;
	uint		i;

	pPio	= AT91C_BASE_PIO;
    pPio->PIO_ODR = NANDFR_B;

	pflash = (char *)NANDFCE;
	*pflash = 0x01;

	pflash = (char *)NANDFORD;
	*pflash = 0x60;
	pflash = (char *)NANDFADDR;
	*pflash = addr&0xff;
	*pflash = addr/0x100;

	pflash = (char *)NANDFORD;
	*pflash = 0xD0;

	for( i=0; i<10; i++ )
	{
		LoopNop( 1000 );	//Delay 1.5ms
		if( pPio->PIO_PDSR & NANDFR_B )
			break;
	}

	if( i < 10 )
	{
		pflash = (char *)NANDFORD;
		*pflash = 0x70;
		pflash = (char *)NANDFLASH;
		i = *pflash & 1;
	}

	pflash = (char *)NANDFCE;
	*pflash = 0x00;

	return( i );
}