da_1.c

51 单片机的c程序

/**********************************************
*   File: DA_1.C
*   Description: DAC0832 Interface 
*   Created Date:  2007-10-01
*   Last Modified: 2007-10-01
*   Author: Jeffrey - [e-mail]
*   Notes: None
**********************************************/
#include "Atmel/AT89X51.h"
#include "INTRINS.H"

//*******定义DAC0832控制端口*****************//
#define CS1 P0_3
#define WR	P0_4
#define XFER P0_7
#define DOUT P1
#define CS2 P2_6
//*******定义DAC0832控制端口*****************//

void InitDAC0832();
void SetDAC0832_1(unsigned char DAC);
void SetDAC0832_2(unsigned char DAC);
void SetDAC0832(unsigned char DACx,unsigned char DACy);
void Start_DAC();

/**********************************************
*   Function: delay(unsigned int t)
*   Input Variables: t
*   Return Variables: None
*   Usage: Common Delay Routine, t as the delay time ticks
**********************************************/
void delay(unsigned int t)
{
	for(;t>0;t--);		// 延时循环
}

/**********************************************
*   Function: main()
*   Input Variables: None
*   Return Variables: None
*   Usage: Program Entry
*********************************************/
void main()
{
	unsigned char x = 0;
	unsigned char y = 0;
	InitDAC0832();	  					// 初始化AD7812
	delay(50);    	  					// 启动时间约1.5us，延迟
	
	while(1)
	{
		SetDAC0832_1(x);						// DAC0832 1赋值x
		SetDAC0832_2(y);						// DAC0832 2赋值y
		Start_DAC();							// 启动DAC转换
		delay(1000);							// 延时
		x++;									// x++
		y++;									// y++
		SetDAC0832(x,y);						// 同时写两个DAC
		Start_DAC();							// 启动同步转换
		//********************主程序部分*********************//
		delay(1000);							// 延时
		//********************主程序部分*********************//
		x++;									// x++
		y++;									// y++
	}
}

/**********************************************
*   Function: InitDAC0832()
*   Input Variables: None
*   Return Variables: None
*   Usage: Init DAC0832
*********************************************/
void InitAD7812()
{
	CS1 = 1;	  				// 置高Cs1
	CS2 = 1;	  				// 置高Cs2
	WR = 0;						// WR有效
}

/**********************************************
*   Function: SetDAC0832_1( unsigned char DAC)
*   Input Variables: unsigned char DAC
*   Return Variables: None
*   Usage: Set DAC Register of DAC0832
*********************************************/
void SetDAC0832_1( unsigned char DAC)
{
	CS1 = 0;					// CS1有效；
	_nop_();					// nop
	DOUT = DAC;					// 写DAC寄存器
	_nop_();					// nop
	CS1 = 1;					// CS1无效
}

/**********************************************
*   Function: SetDAC0832_2( unsigned char DAC)
*   Input Variables: unsigned char DAC
*   Return Variables: None
*   Usage: Set DAC Register of DAC0832
*********************************************/
void SetDAC0832_2( unsigned char DAC)
{
	CS2 = 0;					// CS2有效；
	_nop_();					// nop
	DOUT = DAC;					// 写DAC寄存器
	_nop_();					// nop
	CS2 = 1;					// CS2无效
}

/**********************************************
*   Function: SetDAC0832( unsigned char DAC)
*   Input Variables: unsigned char DAC
*   Return Variables: None
*   Usage: Set DAC Register of DAC0832
*********************************************/
void SetDAC0832(unsigned char DACx,unsigned char DACy)
{
	SetDAC0832_1(DACx);
	SetDAC0832_2(DACy);
}

/**********************************************
*   Function: Start_DAC()
*   Input Variables: void
*   Return Variables: void
*   Usage:  Start a Conversion
*********************************************/
void Start_DAC()
{
	XFER = 0;						// XFER有效启动DA转换
	_nop_();						// _nop_
	XFER = 1;						// XFER恢复高电平
}