DAC0832信号发生器仿真及源代码 -

#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit WR1 = P2^4;
sbit CS = P2^5;
#define DA0832 P1
sbit VPP=P3^4;
sbit RS = P2^0;
sbit RW = P2^1;
sbit E = P2^2;
uchar c=0,tl,th,t;
bit wave_change=0,is_stop=0;
uint code T_WAVE_INIT_code[]={1,5,6,7,8,10,13,17,25,50,500,
526,556,588,625,667,714,769,833,909,1000,1111,1250,1429,1667,2000,2500,3333,5000};
uint code f_code[]={1,100,80,70,60,50,40,30,20,10,1,
950,900,850,800,750,700,650,600,550,500,450,400,350,300,250,200,150,100};
uchar code tosin[256]={0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,0xb1,0xb4,0xb7,0xba,
0xbc,0xbf,0xc2,0xc5 ,0xc7,0xca,0xcc,0xcf,0xd1,0xd4,0xd6,0xd8,0xda,0xdd,0xdf,0xe1,0xe3,0xe5,0xe7,0xe9,0xea,0xec,0xee,0xef,
0xf1,0xf2,0xf4,0xf5 ,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfd,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xfe,0xfd ,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf4,0xf2,0xf1,0xef,0xee,0xec,0xea,0xe9,0xe7,0xe5,0xe3,
0xe1,0xde,0xdd,0xda ,0xd8,0xd6,0xd4,0xd1,0xcf,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xae,0xab,0xa8,0xa5,
0xa2,0x9f,0x9c,0x99 ,0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80,0x80,0x7c,0x79,0x76,0x72,0x6f,0x6c,0x69,0x66,0x63,0x60,0x5d,
0x5a,0x57,0x55,0x51 ,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,0x29,0x27,0x25,0x22,0x20,0x1e,
0x1c,0x1a,0x18,0x16 ,0x15,0x13,0x11,0x10,0x0e,0x0d,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,
0x00,0x00,0x00,0x00 ,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02 ,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0d,0x0e,
0x10,0x11,0x13,0x15 ,0x16,0x18,0x1a,0x1c,0x1e,0x20,0x22,0x25,0x27,0x29,0x2b,0x2e,0x30,0x33,0x35,0x38,0x3a,0x3d,0x40,0x43,
0x45,0x48,0x4c,0x4e ,0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66 ,0x69,0x6c,0x6f,0x72,0x76,0x79,0x7c,0x80};
char T_WAVE_INIT_code_num=28;
uint temp;
uint T_WAVE_INIT,H_count,T_count;
bit is_L_H=0;
uchar VPP_num=10,real_VPP_num=0xff;
uchar Display_Buffer[2][16] ={
{"square Vpp=5.0V"},
{"010KHz step=50Hz"}
};
#include"1602.c"
//函数声明
void Refesh_Disp_Buffer();// 刷新显示缓冲
//--------------------------------------------------------------
// 主程序
//-----------------------------------------------------------------
void main()
{
uchar VPP_num_temp;
CS=0;
WR1=0;
T_WAVE_INIT=T_WAVE_INIT_code[T_WAVE_INIT_code_num];
th=(65536-T_WAVE_INIT)/256;
tl=(65536-T_WAVE_INIT)%256;
temp=f_code[T_WAVE_INIT_code_num];
TMOD=0X11;
TH0=th;
TL0=tl;
ET0=1;
TR0=0;
TH1=th;
TL1=tl;
ET1=1;
TR1=0;
EX0=1;
IT0=1;
EX1=1;
IT1=1;
PX1=1;
EA=1;
Initialize_LCD1602();//液晶初始化函数
LCD_Write_Command(0x80);
LCD_Display(Display_Buffer[0]);
LCD_Write_Command(0xC0);
LCD_Display(Display_Buffer[1]);
TR0=1;
while(1)
{
Refesh_Disp_Buffer();
if(VPP==0)
{
DelayMS(5);
if(VPP==0) //调节并显示频率的幅度
{
VPP_num--;
if(VPP_num==0)VPP_num=10;
VPP_num_temp=VPP_num*5;
LCD_Write_Command(0x80+12);
Write_LCD_Data(VPP_num_temp/10+'0');
Write_LCD_Data('.');
Write_LCD_Data(VPP_num_temp%10+'0');
real_VPP_num=255.0/10*VPP_num;
while(!VPP);
}
}
}
}
//--------------------------------------------------------------------------
// 刷新显示缓冲
//-------------------------------------------------------------------------
void Refesh_Disp_Buffer()
{
//temp; //temp表示需显示的频率值
Display_Buffer[1][0] = temp/100+'0'; //整数位频率
Display_Buffer[1][1] = temp/10%10+'0'; //整数位
Display_Buffer[1][2] = temp%10+'0'; //两个小数位
if(T_WAVE_INIT_code_num<11) //显示频率1K---100K T_WAVE_INIT:500-5
{
Display_Buffer[1][3] = 'K';
LCD_Write_Command(0xC0+12); //显示步进值高频
Write_LCD_Data('1');
Write_LCD_Data('0');
Write_LCD_Data('K');
Write_LCD_Data('H');
}
else
{
Display_Buffer[1][3] = ' ';
LCD_Write_Command(0xC0+12); //显示步进值低频
Write_LCD_Data('5');
Write_LCD_Data('0');
Write_LCD_Data('H');
Write_LCD_Data('z');
}
LCD_Write_Command(0xC0); //显示当前频率值
Write_LCD_Data(Display_Buffer[1][0]);
Write_LCD_Data(Display_Buffer[1][1]);
Write_LCD_Data(Display_Buffer[1][2]);
Write_LCD_Data(Display_Buffer[1][3]);
if(wave_change==0)
{
LCD_Write_Command(0x80);
Write_LCD_Data('s');
Write_LCD_Data('q');
Write_LCD_Data('u');
Write_LCD_Data('a');
Write_LCD_Data('r');
Write_LCD_Data('e');
Write_LCD_Data(' ');
}
else
{
LCD_Write_Command(0x80);
Write_LCD_Data('s');
Write_LCD_Data('i');
Write_LCD_Data('n');
Write_LCD_Data('w');
Write_LCD_Data('a');
Write_LCD_Data('v');
Write_LCD_Data('e');
}
if(wave_change==1&&is_stop==1){TR1=1;is_stop=0;}
if(wave_change==0&&is_stop==1){TR0=1;is_stop=0;}
}
//-------------------------------------------------
void INT0_int(void) interrupt 0 //中断服务程序波形切换
{
wave_change=!wave_change;
if(wave_change)
{
TR0=0;
TR1=1;
}
else
{
TR1=0;
TR0=1; //输出方波形
}
}
void INT1_int(void) interrupt 2 //按键中断服务程序调频
{
if(wave_change) {TR1=0;is_stop=1;}
else {TR0=0;is_stop=1;}
T_WAVE_INIT_code_num=T_WAVE_INIT_code_num-1; //i增加，于是f减少
if(T_WAVE_INIT_code_num==0)T_WAVE_INIT_code_num=28;
T_WAVE_INIT=T_WAVE_INIT_code[T_WAVE_INIT_code_num];
th=(65536-T_WAVE_INIT)/256;
tl=(65536-T_WAVE_INIT)%256;
temp=f_code[T_WAVE_INIT_code_num];
}
void time0_int(void) interrupt 1 //中断服务程序输出方波形
{
static bit d;
TH0=th;
TL0=tl;
d=~d;
if(d)
DA0832=0x00;
else
DA0832=real_VPP_num;
}
void time1_int(void) interrupt 3 //中断服务程序输出正弦波形
{
static uchar b=0;
TH0=th;
TL0=tl;
DA0832=tosin[b]/10*VPP_num; ; //正弦波
b+=8;
}

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