【分享】51单片机读写25Q80测试程序
#include <reg52.h>
#include <intrins.h>
unsigned long Addre24; //24位的Flash地址
sbit CS = P1^0; //选通
sbit SCLK = P1^1; //时钟
sbit DIO = P1^2;//输入
sbit DO = P1^3; //输出
void Send_OneByte(unsigned char DATA8) //从SPI发8位数
{ //上升沿写入
unsigned char x;
for (x=0;x<8;x++)
{
if(DATA8&0x80)
DIO=1;
else
DIO=0;
DATA8=DATA8<<1;
SCLK=0;
SCLK=1;
}
}
unsigned char Read_OneByte(void) //从SPI收8位数
{ //下降沿输出
unsigned char DATA8;
unsigned char x;
SCLK=1;
for (x=0;x<8;x++)
{
SCLK=1;
SCLK=0;
DATA8=(DATA8<<1)|DO;
}
return (DATA8);
}
//*************** 写允许 ****************************OK
void WriteEnable(void)
{
CS=0;
Send_OneByte(0x06);
CS=1;
}
//*************** 写禁止 **************************** OK
void WriteDisable (void)
{
CS=0;
Send_OneByte(0x04);
CS=1;
}
//***************判BUSY********************************
unsigned char W25X_BUSY_OrNot (void) //在读和写之前得先判断FLASH是否BUSY
{ //BUSY的原因是擦除，或是连续读写
unsigned char k; // 如果没有以上方式，不必判定可以写读
// PCA0CPH2 = 0x00;
SCLK=1;
_nop_();
CS=0;
Send_OneByte(0x05);//读状态寄存器
k=Read_OneByte();//读一个字节
k=k&0x01;
CS=1;_nop_();
SCLK=1;
if(k)return (0x01);
else return (0x00);
}
void W25X_Flash_Byte_Write(unsigned long Addre24,unsigned char dat)
{
while(W25X_BUSY_OrNot ());//判BUSY 等到Flash闲才能操作
WriteEnable(); //写允许
//把地址拆开来
CS=0;
Send_OneByte(0x02); //命令
Send_OneByte(Addre24>>16);
Send_OneByte(Addre24>>8);
Send_OneByte(Addre24);
Send_OneByte(dat);
CS=1;
WriteDisable ();
}//写FLASH结束
unsigned char W25X_Flash_Byte_Read (unsigned long Addre24)//从Flash里读出小于256字节数
{
unsigned char temp;
while(W25X_BUSY_OrNot ());//判BUSY
WriteEnable();
CS=0;
Send_OneByte(0x03);//命令读
Send_OneByte(Addre24>>16);
Send_OneByte(Addre24>>8);
Send_OneByte(Addre24);
temp=Read_OneByte();
CS=1;
WriteDisable ();
return temp;
}
//**************片擦除 (MAX_80S)****************** OK
void W25X_ChipErase(void)
{
WriteEnable(); //写允许
SCLK=1;
CS=0;
Send_OneByte(0xc7);//整片擦除命令
CS=1; //从CS=1时开始执行擦除
}
//*************** 4K扇擦除************************ OK
void W25X_SectorErase(unsigned long Addre24) //擦除资料图示的4KB空间
{
unsigned char Addre3;
unsigned char Addre2;
unsigned char Addre1;
WriteEnable(); //写允许
Addre1=Addre24;
Addre24=Addre24>>8;
Addre2=Addre24;
Addre24=Addre24>>8;
Addre3=Addre24; //把地址拆开来
SCLK=1;
CS=0;
Send_OneByte(0x20);//整扇擦除命令
Send_OneByte(Addre3);
Send_OneByte(Addre2);
Send_OneByte(Addre1);
CS=1;
}
//64K页/块擦除
void W25X_BlockErase(unsigned long Addre24) //擦除资料图示的64KB空间
{
unsigned char Addre3;
unsigned char Addre2;
unsigned char Addre1;
WriteEnable(); //写允许
Addre1=Addre24;
Addre24=Addre24>>8;
Addre2=Addre24;
Addre24=Addre24>>8;
Addre3=Addre24; //把地址拆开来
SCLK=1;
CS=0;
Send_OneByte(0xd8);//整扇擦除命令
Send_OneByte(Addre3);
Send_OneByte(Addre2);
Send_OneByte(Addre1);
CS=1;
}
void main()
{
//W25X_ChipErase(); //片擦除
W25X_SectorErase(0); //4K擦除
//W25X_BlockErase (Addre24); //64K块擦除
W25X_Flash_Byte_Write(0,0x01);//写入存存储据
while(W25X_BUSY_OrNot ());
while(1)
{
P0=W25X_Flash_Byte_Read (0); //读出存储数据
}
}
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