max5478.h

maxim（美信）公司生产的MAX5478数字电位器的驱动程序 keil上用c51编写的

/*******************************************************/
/*************     MAX5478 DRIVER     ******************/
/*************     EDITED BY TNXN     ******************/
/*************        2006.9.1        ******************/
/*******************************************************/


//////////////////写24c01--外部调用//////////////////////////
void MAX5478_WriteChar(unsigned char address,unsigned char udata_0,unsigned char udata_1)
{   
	Start();
    Writebyte(address);
    Writebyte(udata_0);
    Writebyte(udata_1);
    Stop();
	Delay();//此处延时根据实际情况，如果不延时，可能会不正常
}




void MAX5478_Command_NVREG(unsigned char address,bit wiper_a,bit wiper_b,unsigned char udata)
{
	unsigned char temp_uchar;
	temp_uchar=0x20;
	if(wiper_a==1)
	{
		temp_uchar|=0x01;
	}

	if(wiper_b==1)
	{
		temp_uchar|=0x02;
	}

	MAX5478_WriteChar((address<<1)|0x50,temp_uchar,udata);

}


void MAX5478_Command_NVREGxVREG(unsigned char address,bit wiper_a,bit wiper_b,unsigned char udata)
{
	unsigned char temp_uchar;
	temp_uchar=0x60;
	if(wiper_a==1)
	{
		temp_uchar|=0x01;
	}

	if(wiper_b==1)
	{
		temp_uchar|=0x02;
	}

	MAX5478_WriteChar((address<<1)|0x50,temp_uchar,udata);

}


void MAX5478_Command_VREGxNVREG(unsigned char address,bit wiper_a,bit wiper_b,unsigned char udata)
{
	unsigned char temp_uchar;
	temp_uchar=0x50;
	if(wiper_a==1)
	{
		temp_uchar|=0x01;
	}

	if(wiper_b==1)
	{
		temp_uchar|=0x02;
	}

	MAX5478_WriteChar((address<<1)|0x50,temp_uchar,udata);

}