eeprom 的写操作比较费时,页写的效率要比字节高,但是页写需要控制地址卷页(roll),这里给出一个简单算法,欢迎讨论,希望有更简单的.
//**************************************************************
// Function: eeprom_prg_page
// Programmer:ASTEC CHINA
// Description:a simple page edge detect algorithm for page write of at24c02.
// input para:
// *data: write data pointer
// addr: eeprom address
// numb: write byte length
// output para: none
// modify history: 12/11/06 initia
// 13//11/06 test pass
//**************************************************************
void ext_eep_prg(unsigned char *data, unsigned int addr,unsigned char numb)
{
static unsigned char nlength, nlength_offset;
if(addr%8==0) //addr=n*8?
{
if(numb<=8)
{
nlength=numb;
I2C_write_page(addr,data,nlength);
}
else
{
nlength=numb>>3;
nlength_offset= numb%8;
while(nlength--)
{
I2C_write_page(addr,data,8);
addr=addr+8;
data=data+8;
}
if(nlength_offset>0)
{
I2C_write_page(addr,data,nlength_offset);
}
}
}
else
{
nlength=8-(addr%8);
if(numb<=nlength)
{
nlength=numb;
I2C_write_page(addr,data,nlength);
}
else
{
I2C_write_page(addr,data,nlength);
addr=addr+nlength;
data=data+nlength;
numb=numb-nlength;
nlength=numb>>3;
nlength_offset= numb%8;
while(nlength--)
{
I2C_write_page(addr,data,8);
addr=addr+8;
data=data+8;
}
if(nlength_offset>0)
{
I2C_write_page(addr,data,nlength_offset);
}
}
}
__RESET_WATCHDOG();
// wreeprom_exit_flag=1;
} |
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