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AT45DB161串行FLASH操作

news 来源：原创 2025/4/25 10:03:49

//cpu是MSP430F4618

//用的是SPI硬件接口

#define AT45DB_ARRAY_RD 0xe8
#define AT45DB_PAGE_RD 0xd2
#define AT45DB_BUF1_RD 0xd4
#define AT45DB_BUF2_RD 0xd6
#define AT45DB_STATUS_RD 0xd7

#define AT45DB_BUF1_WR 0x84
#define AT45DB_BUF2_WR 0x87
#define AT45DB_B12MER_WR 0x83
#define AT45DB_B22MER_WR 0x86
#define AT45DB_B12M_WR 0x88
#define AT45DB_B22M_WR 0x89
#define AT45DB_P_ER 0x81
#define AT45DB_B_ER 0x50
#define AT45DB_MPTB1 0x82
#define AT45DB_MPTB2 0x85

#define AT45DB_M2B1 0x53
#define AT45DB_M2B2 0x55
#define AT45DB_MCMPB1 0x60
#define AT45DB_MCMPB2 0x61

#define AT45DB_CS_LOW P7OUT&=~BIT5
#define AT45DB_CS_HI P7OUT|=BIT5
#define AT45DB_RST_LOW P7OUT&=~BIT4
#define AT45DB_RST_HI P7OUT|=BIT4

void spi_init(void) //SPI口初始化

{
ME2 |= USPIE1;
U1CTL |= SYNC+CHAR+MM;
U1TCTL |= CKPH+SSEL1+SSEL0+STC;
U1BR0 = 0x02; // SMCLK/2 for baud rate
U1BR1 = 0; // SMCLK/2 for baud rate
U1MCTL = 0; // Clear modulation
U1CTL &= ~SWRST; // Initialize USART state machine
}

void delay ( void )
{
_NOP();_NOP();_NOP();_NOP();_NOP();
_NOP();_NOP();_NOP();_NOP();_NOP();
_NOP();_NOP();_NOP();_NOP();_NOP();
_NOP();_NOP();_NOP();_NOP();_NOP();

}

void at45db_cs_low (void)
{
AT45DB_CS_LOW;
_NOP();_NOP();_NOP();_NOP();_NOP();
}

void at45db_cs_hi (void)
{
AT45DB_CS_HI ;
_NOP();_NOP();_NOP();_NOP();_NOP();
}

INT8U at45db_wr_byte( INT8U content )
{
U1TXBUF= content;
delay(); delay();
return U1RXBUF;

}

INT8U at45db_get_status ( void) //读取状态
{

at45db_cs_low();
U1TXBUF= AT45DB_STATUS_RD;
delay();
U1TXBUF= 0x55;
delay();
at45db_cs_hi();
return U1RXBUF;
}

INT8U at45db_wr_page ( INT16U page_adr,INT8U *buf ) //写页
{
INT8U tmp1,tmp2;
INT16U tmp_lenth;

if (at45db_get_status ()!=0xac ) return 255;
page_adr &=0xfff;
page_adr <<=2;
tmp1 =page_adr /256;
tmp2 =page_adr %256;
at45db_cs_low();
U1TXBUF= AT45DB_BUF1_WR; //command
delay();
U1TXBUF=0x00; //don't care
delay();
U1TXBUF=0x00; //don't care
delay();
U1TXBUF=0x00; // in page adr
delay();

for ( tmp_lenth=0;tmp_lenth<512;tmp_lenth++)
{
U1TXBUF=*buf;
buf++;
delay();delay();delay();
}
delay();delay();
at45db_cs_hi();
delay(); delay(); delay(); delay(); delay();
delay(); delay(); delay();delay(); delay();
delay(); delay(); delay(); delay(); delay();
delay(); delay(); delay(); delay(); delay();
delay(); delay(); delay();delay(); delay();
delay(); delay(); delay(); delay(); delay();
delay(); delay(); delay(); delay(); delay();
delay(); delay(); delay();delay(); delay();
delay(); delay(); delay(); delay(); delay();
delay(); delay(); delay(); delay(); delay();
delay(); delay(); delay();delay(); delay();
delay(); delay(); delay(); delay(); delay();
delay(); delay(); delay(); delay(); delay();
delay(); delay(); delay();delay(); delay();
delay(); delay(); delay(); delay(); delay();
at45db_cs_low();
U1TXBUF= AT45DB_B12MER_WR;
delay();
U1TXBUF= tmp1; //page adr
delay();
U1TXBUF= tmp2; //page adr
delay();
U1TXBUF= 0x55;
delay();
delay();
delay();
at45db_cs_hi();
delay();
delay();
delay();
delay();
return 0;

}

//读页，给定页和页内地址的读取
INT8U at45db_rd (INT16U page_adr,INT16U in_page_adr,INT8U *buf,INT16U lenth )
{
INT8U tmp1,tmp2;
INT16U tmp_lenth;

if (at45db_get_status ()!=0xac ) return 255;
page_adr &=0xfff;
page_adr <<=2;
tmp1 = in_page_adr /256;
page_adr |=tmp1;

tmp1 =page_adr /256;
tmp2 =page_adr %256;
at45db_cs_low();
U1TXBUF= AT45DB_PAGE_RD; //command
delay();
U1TXBUF=tmp1; //page adr
delay();
U1TXBUF=tmp2; //page adr
delay();
tmp1= in_page_adr %256;
U1TXBUF=tmp1; // in page adr
delay();

U1TXBUF=0x55; // don't care bit
delay();
U1TXBUF=0x55; // don't care bit
delay();
U1TXBUF=0x55; // don't care bit
delay();
U1TXBUF=0x55; // don't care bit
delay();

for ( tmp_lenth=0;tmp_lenth< lenth;tmp_lenth++)
{
U1TXBUF=0x55;
delay();
*buf = U1RXBUF;
buf++;
}
at45db_cs_hi();
return 0;
}

//页读取（读取512字节）

INT8U at45db_rd_page (INT16U page_adr,INT8U *buf )
{
INT8U tmp1,tmp2;
INT16U tmp_lenth;

if (at45db_get_status ()!=0xac ) return 255;
page_adr &=0xfff;
page_adr <<=2;
tmp1 =page_adr /256;
tmp2 =page_adr %256;
at45db_cs_low();
U1TXBUF= AT45DB_PAGE_RD; //command
delay();
U1TXBUF=tmp1; //page adr
delay();
U1TXBUF=tmp2; //page adr
delay();
U1TXBUF=0x00; // in page adr
delay();

U1TXBUF=0x55; // don't care bit
delay();
U1TXBUF=0x55; // don't care bit
delay();
U1TXBUF=0x55; // don't care bit
delay();
U1TXBUF=0x55; // don't care bit
delay();

for ( tmp_lenth=0;tmp_lenth<512;tmp_lenth++)
{
U1TXBUF=0x55;
delay();
*buf = U1RXBUF;
buf++;
}
at45db_cs_hi();
return 0;
}

//AT45DB测试

void at45db_test ( void)
{
INT16U page;
page =0;

for ( page =0;page <512;page ++)
{
at45db_buf[page]= page;
}
page =0;
at45db_wr_page ( page, at45db_buf); //写一页
for ( page =0;page <30000;page ++) _NOP();

page =0;

while (1)
{
at45db_rd_page (page ,at45db_buf); //按页读取
page ++;
}

}

void at45db_init ( void ) //初始化
{
INT16U tmp;
INT16U tmp_page;
INT8U tmp_b;
AT45DB_RST_LOW;
for ( tmp=0;tmp<sizeof(at45db_buf) ;tmp ++)
{
_NOP();_NOP();_NOP();_NOP();_NOP();_NOP();
}
AT45DB_RST_HI;

if ( hld_reg[AT45DB_INIT]== 0xa55a )
{
hld_reg[AT45DB_INIT]= 0;
hld_reg[AT45DB_PAGE]=0;
for ( tmp =0;tmp<4096;tmp ++ )
{
at45db_cs_low();
tmp_page = tmp<<2;
U1TXBUF= AT45DB_P_ER;
delay();

tmp_b=tmp_page /256;
U1TXBUF= tmp_b;
delay();
tmp_b=tmp_page % 256;
U1TXBUF= tmp_b;

delay();
U1TXBUF= 0x55;
delay();
at45db_cs_hi();

do
{
for ( tmp_page=0; tmp_page< 40000; tmp_page++) _NOP();
kill_wd();
} while (at45db_get_status ( )!=0xac );

}
}

}