基于51单片机的信号发生和测量(D/A、A/D转换)

#include <reg52.h> #include <absacc.h> #include <stdio.h> #include <intrins.h> #define uchar unsigned char #define uint unsigned int //定义DAC0832的地址 #define DAC_OUT XBYTE[0x7fff] /* 波形数据 ---------------------------------------------------------*/ uint code Sine12bit[32] = { 2448,2832,3186,3496,3751,3940,4057,4095,4057,3940, 3751,3496,3186,2832,2448,2048,1648,1264,910,600,345, 156,39,0,39,156,345,600,910,1264,1648,2048 }; sbit SB1 = P3^4; sbit SB2 = P3^5; sbit SW = P3^7; //定义峰值，频率，输出的波形 uchar FZ = 50,MS = 1; uint PL = 100; uchar Set = 7; //定义定时器值 uchar TimeH,TimeL; //定义一个数组，保存输出的电压 uchar idata Buffer[32] = {0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,}; uchar code SMG_CODE[] = {/*0,1,2,3,4,5,6,7,8,9,空,*/ 0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x00,}; uchar array[] = {5,0}; sbit Wei1 = P3^2; sbit Wei2 = P3^3; void Write_Wei(uchar x) { if(x&0x01)Wei1 = 1; else Wei1 = 0; if(x&0x02)Wei2 = 1; else Wei2 = 0; } //颜、延时函数 void delayms(uint x) { uchar i; while(x--)for(i = 0; i < 120; i++); } //更新频率 void GX_PL(void) { float x; x = 10000000/32/PL; //x-=20.1; TimeH = (uint)(65536 - x)>>8; TimeL = (uint)(65536 - x)&0xff; RCAP2H = TimeH; RCAP2L = TimeL; } void GX_Bo(uchar x) { uchar i; float y; switch(x) { //选择输出为方波 case 0: MS = 1; for(i = 0; i < 16; i++) { Buffer[i] = FZ/50.0*255.0; } for(i = 16; i < 32; i++) { Buffer[i] = 0; } break; //选择输出为三角波 case 1: MS = 2; y = FZ/16.0; for(i = 0; i < 16; i++) { Buffer[i] = y*i*5.1; } for(i = 16; i < 32; i++) { Buffer[i] = (FZ - (i - 16)*y)*5.1; } break; //选择输出为正玄波 case 2: MS = 3; for(i = 0; i < 32; i++) { Buffer[i] = (uint)Sine12bit[i]/800.0*FZ; } break; case 3: MS = 4; y = FZ/32.0; for(i = 0; i < 32; i++) { Buffer[i] = y*i*5.1; } break; } } //主函数 void main(void) { uchar Old_SW = 1; GX_Bo(1); //更新频率 GX_PL(); EA = 1; ET2 = 1; TR2 = 1; TMOD = 0x01; TH0 = (65536 - 5000)>>8; TL0 = (65536 - 5000)&0xff; ET0 = 1; TR0 = 1; //实时扫描按键 while(1) { if(SW != Old_SW) { Old_SW = SW; if(SW == 1)GX_Bo(1); else if(SW == 0)GX_Bo(3); } if(SB1 == 0) { if(FZ < 50)FZ++; if(SW == 1)GX_Bo(1); else if(SW == 0)GX_Bo(3); while(SB1 == 0); } if(SB2 == 0) { if(FZ > 1)FZ--; if(SW == 1)GX_Bo(1); else if(SW == 0)GX_Bo(3); while(SB2 == 0); } array[0] = FZ/10; array[1] = FZ%10; } } void ET0_T0(void) interrupt 1 { static uchar i = 0,Wei = 0xfe; TH0 = (65536 - 5000)>>8; TL0 = (65536 - 5000)&0xff; P1 = 0x00; Write_Wei(Wei); if(i == 0)P1 = SMG_CODE[array[i]]|0x80; else P1 = SMG_CODE[array[i]]; Wei = (Wei<<1)|0x01; if(++i == 2){i = 0; Wei = 0xfe;} } //定时器用于输出电压 void ET2_T2(void) interrupt 5 { static uchar i = 0; TF2 = 0; DAC_OUT = Buffer[i]; if(++i == 32)i = 0; }