AD/DA

介绍

硬件电路模型

硬件电路

运算放大器

运放电路

DA原理

原理图

AD原理

AD/DA性能指标

XPT2046

XPT2046时序

原理图

AD模数转换可调电阻光敏温度电阻

XPT2046.c

#include <REGX52.H>

sbit XPT2046_CS=P3^5;
sbit XPT2046_DCLK=P3^6;
sbit XPT2046_DIN=P3^4;
sbit XPT2046_DOUT=P3^7;

unsigned int XPT2046_ReadAD(unsigned char Command)
{
	unsigned int ADVAlue=0;
	unsigned char i;
	XPT2046_CS=0;
	XPT2046_DCLK=0;
	for(i=0;i<8;i++)
	{
		XPT2046_DIN=Command&(0x80>>i);
		XPT2046_DCLK=1;
		XPT2046_DCLK=0;
	}
	for(i=0;i<16;i++)
	{
		XPT2046_DCLK=1;
		XPT2046_DCLK=0;
		if(XPT2046_DOUT){ADVAlue|=(0x8000>>i);}
	}
	XPT2046_CS=1;
	if(Command&0x08)
	{
		return ADVAlue>>8;
	}
	else
	{
		return ADVAlue>>4;
	}
}

XPT2046.h

#ifndef __XPT2046_H__
#define __XPT2046_H__

#define XPT2046_XP_8		0x9C//0x8C
#define XPT2046_YP_8		0xDC
#define XPT2046_AUX_8		0xEC
#define XPT2046_VBAT_8		0xAC

#define XPT2046_XP_12		0x94//0x84
#define XPT2046_YP_12		0xD4
#define XPT2046_AUX_12		0xE4
#define XPT2046_VBAT_12		0xA4

unsigned int XPT2046_ReadAD(unsigned char Command);

#endif

main.c

#include <REGX52.H>
#include "Delay.h"
#include "LCD1602.h"
#include "XPT2046.h"

unsigned int ADValue;

void main()
{
	LCD_Init();
	LCD_ShowString(1,1,"ADJ NTC RG");
	while(1)
	{
		ADValue=XPT2046_ReadAD(XPT2046_XP_8);
		LCD_ShowNum(2,1,ADValue,3);
		ADValue=XPT2046_ReadAD(XPT2046_YP_8);
		LCD_ShowNum(2,5,ADValue,3);
		ADValue=XPT2046_ReadAD(XPT2046_VBAT_8);
		LCD_ShowNum(2,9,ADValue,3);
		Delay(10);
		
	}
}

运行效果

DA数模转换呼吸灯

main.c

#include <REGX52.H>
#include "Delay.h"
#include "Key.h"
#include "Nixie.h"
#include "Timer0.h"

sbit Motor=P2^1;

unsigned char Counter,Compare;
unsigned char i;

void main()
{
	Timer0_Init();
	while(1)
	{
		for(i=0;i<100;i++)
		{
			Compare=i;
			Delay(10);
		}
		for(i=100;i>0;i--)
		{
			Compare=i;
			Delay(10);
		}
	}
}

void Timer0_Routine() interrupt 1
{
	TL0 = 0x9C;				//设置定时初始值
	TH0 = 0xFF;				//设置定时初始值
	Counter++;
	Counter%=100;
	if(Counter<Compare)
	{
		Motor=1;
	}
	else
	{
		Motor=0;
	}
}