原创福音！总算找到AT45DBXX可替换型号[原创]

 2011-1-5 21:08  1895 5 5 分类: 通信

费尽周折，可谓山穷水尽疑无路，柳暗花明又一村，哈哈
M45PE40-VMW6TG，可替代AT45DB041
公布移植代码。

//ICC-AVR application builder : 2010-11-11 18:37:49
// Target : M128
// Crystal: 8.0000Mhz

＃i nclude <iom128v.h>
＃i nclude <macros.h>

#define uint unsigned int
#define uchar unsigned char
#define ulong unsigned long

#define DB041CS (1<<0)
#define BEEP (1<<5)

//命令
#define WREN 0x06       //写使能
#define WRDI 0x04       //写禁止
#define RDID 0x9F       //读芯片ID
#define RDSR 0x05       //读状态寄存器
#define READ 0x03       //读数据
#define FAST_READ 0x0B //快速读数据
#define PW   0x0A       //页写
#define PP   0x02       //页编程
#define PE   0xDB       //页擦除
#define SCE 0xD8       //扇区擦除
#define DP   0xB9       //掉电模式
#define RDP 0xAB       //掉电模式换醒

uchar Data_Buff[256];

void port_init(void)
{
PORTA = 0x00;
DDRA = 0x00;
PORTB = 0xF7;
DDRB = 0xF7; //11110111
PORTC = 0x00; //m103 output only
DDRC = 0x00;
PORTD = 0x00;
DDRD = 0x00;
PORTE = 0x00;
DDRE = 0x00;
PORTF = 0x00;
DDRF = 0x00;
PORTG = 0x00;
DDRG = 0x00;
}

//SPI initialize
// clock rate: 2000000hz
void spi_init(void)
{
SPCR = 0x5f; //setup SPI 模式3 速率8/128M
}

//call this routine to initialize all peripherals
void init_devices(void)
{
//stop errant interrupts until set up
CLI(); //disable all interrupts
XDIV = 0x00; //xtal divider
XMCRA = 0x00; //external memory
port_init();
spi_init();

MCUCR = 0x80;
EICRA = 0x00; //extended ext ints
EICRB = 0x00; //extended ext ints
EIMSK = 0x00;
TIMSK = 0x00; //timer interrupt sources
ETIMSK = 0x00; //extended timer interrupt sources
SEI(); //re-enable interrupts
//all peripherals are now initialized
}
/******************************************************************************/
/* 函数名称：void write_to_flash_byte(uchar)                                  */
/* 功能描述：向AT45DB081B flas写入一个字节                                    */
/* 参数说明：cdata为待写入的数据                                              */
/* 参数返回：无                                                               */
/******************************************************************************/
void Write_To_Flash_Byte(uchar cdata)
{
   uchar byte;
   SPDR = cdata;
   while (!(SPSR & 0x80))
       ;                     //等待写结束
   byte = SPDR;
}
/******************************************************************************/
/* 函数名称：uchar check_flash_busy(void)                                     */
/* 功能描述：检查flash是否忙                                                  */
/* 参数说明：无                                                               */
/* 参数返回: 如果忙返回1，不忙返回0                                           */
/******************************************************************************/
uchar Check_Flash_Busy(void)
{
uchar busy_flag;
PORTB &=~DB041CS;                     //置cs低选中
Write_To_Flash_Byte(RDSR);
Write_To_Flash_Byte(0xff);       //写字节数据，使字节数据从SO移出
busy_flag = SPDR;
PORTB |=DB041CS;                  //置cs高不选中
if(busy_flag & 1)
      busy_flag = 1;
else
      busy_flag = 0;
return busy_flag;
}
/******************************************************************************/
/* 函数名称：void read_flash(uchar,uint,uint,uint)                            */
/* 功能描述：从flash指定页指定页内起始地址读取指定数量的数据字节到            */
/*           datasave_buff数组                                                */
/* 参数说明：Write_com为命令字READ读命令,page_offset为页内起始地址            */
/*           page_address为页地址，count为欲读取的字节数                      */
/* 参数返回：无                                                              */
/******************************************************************************/
void Read_Flash_page(uchar Readcmd,uint page_offset,uint page_address,uint count,uchar *dp)
{
    uint pa,i;
    uchar byte;
    pa=0;
    //page_address <<=2;
    //pa = page_offset>>8;
    //page_address |= pa;

    while(Check_Flash_Busy()==1);
    PORTB &=~DB041CS;                     //置cs低选中
    Write_To_Flash_Byte(Readcmd);
    Write_To_Flash_Byte((uchar)(page_address>>8));
    Write_To_Flash_Byte((uchar)page_address);
    Write_To_Flash_Byte((uchar)page_offset);
    for(byte=0;byte<4;byte++)
    {
      Write_To_Flash_Byte(0);
    }
for(;count!=0;count--)
    {
       Write_To_Flash_Byte(0xff);    //写字节数据，使字节数据从SO移出
        *dp=SPDR;
        dp++;
    }
    PORTB |=DB041CS;                  //置cs高不选中
}
//-----------------------------------------
/*********************************************************************************************************
**
** input parameters:        uint32 addr： flash addr
                            uint16 number：欲读数据个数
                            uint8 *dp：目的数据指针
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void flash_read_continue(ulong addr,uint number,uchar *dp)
{
    uchar err;
    uint i;
    uint j;
    if(number == 0) return;
    i=addr/256;   //页地址
    j=addr%256;   //页内偏移地址
    if(j+number>256)
    {
        Read_Flash_page(READ,j,i,256-j,dp);
        dp+=(256-j);
        number-=(256-j);
        i++;
        while(1)
        {
            if(number>256)
            {
               Read_Flash_page(READ,0,i,256,dp);
                dp+=256;
                number-=256;
                i++;
            }
            else
            {
             Read_Flash_page(READ,0,i,number,dp);
                break;
            }

        }

    }
    else
    {
      Read_Flash_page(READ,j,i,number,dp);//0-20f
    }

}
//--------------------------------------------------------
void main(void )
{
      init_devices();
      PORTB= ~BEEP;
   PORTB |=BEEP; /* low output to turn BEEP on */
   Read_Flash_page(READ,0,0,256,Data_Buff);//0-ff
      Read_Flash_page(READ,0,1,256,Data_Buff);//100-1ff
      Read_Flash_page(READ,0,2,256,Data_Buff);//200-2ff
      Read_Flash_page(READ,0,3,256,Data_Buff);//300-3ff
      Read_Flash_page(READ,0,4,256,Data_Buff);//400-4ff

     flash_read_continue(0x210,256,Data_Buff);
      flash_read_continue(0x220,256,Data_Buff);
      flash_read_continue(0x620,256,Data_Buff);
      flash_read_continue(0x400,256,Data_Buff);

   while(1);
}