#include?“AD5420.h“
/*
輸入移位寄存器位24位
由8位地址位和24位數(shù)據(jù)組成
在SCLK的上升沿MSB開始被載入
最高30MHz通信速率
LANCH位高電平時鎖存數(shù)據(jù)
在LANCH為高電平期間所有輸入數(shù)據(jù)無效
如果SCLK脈沖數(shù)量不足或者多于24個置位LANCH數(shù)據(jù)同樣無效

數(shù)據(jù)輸出在AD5420的SDO引腳上輸出
*/






//用戶函數(shù)

//初始化
void?ad5420_init（）
{
??unsigned?char?buf[3];
??
??AD5420_clear=0;						//復(fù)位引腳清零
??AD5420_sclk?=0;
??AD5420_sdin?=0;
??
??AD5420_latch=0;
??ad5420_delay（10）;
??AD5420_latch=1;
??ad5420_delay（10）;
??AD5420_latch=0;					???//產(chǎn)生LANCH的脈沖清除移位寄存器中多余的數(shù)據(jù)


??buf[2]?=?ADDRESS_RESET;				//復(fù)位寄存器
??buf[1]?=?0x00;??????????????			//DATA_High_8bit----Disable?Slew?Rate
??buf[0]?=?0x01;						//DATA_LOW_8bit
??WriteToAD5420（buf）;		????		//Write?551005?to?SHIFT?REGISTER??to?write?1005?to?control?register
??ad5420_delay（100）;
??
??
??buf[2]?=?ADDRESS_CONTROL;				//控制寄存器
??buf[1]?=?0x3F;??????????????			//DATA_High_8bit----Disable?Slew?Rate
??buf[0]?=?0x15;						//DATA_LOW_8bit
??WriteToAD5420（buf）;		????		//Write?551005?to?SHIFT?REGISTER??to?write?1005?to?control?register

}

void?ad5420_setValue（unsigned?int?value）
{
?unsigned?char?buf[3];

??AD5420_clear=0;						//復(fù)位引腳清零
??AD5420_sclk?=0;
??AD5420_sdin?=0;
??AD5420_latch=0;
??ad5420_delay（10）;
??AD5420_latch=1;
??ad5420_delay（10）;
??AD5420_latch=0;					???//產(chǎn)生LANCH的脈沖清除移位寄存器中多余的數(shù)據(jù)

?
?buf[2]?=?ADDRESS_DATA;				//數(shù)據(jù)寄存器
?buf[1]?=?value>>8;					//DATA_High_8bit
?buf[0]?=?value;					//DATA_LOW_8bit
?WriteToAD5420（buf）;		???		//Write?01?99?66H?to?SHIFT?REGISTER??to?write?99?66?to?DATA?REGISTER
}














//底層函數(shù)
void?ad5420_delay?（unsigned?int?length）
{
	while?（length?>0）
????	length--;
}

//---------------------------------
//void?WriteToAD5420（unsigned?char?countunsigned?char?*Buf）;
//---------------------------------
//Funct