开始
建立输出正弦波波形码
将波形码进行 D/A 转换 延时
下一个波形码
N 波形码送 完？
Y
正弦波发生器程序如下：
#include <absacc.h> #include <reg51.h>
//绝对地址访问头文件
#define uint unsigned int
#define uchar unsigned char
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,
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,
//函数功能：延时 1ms，T1、工作方式 1，定时初值 64536
//形式参数：无
//返回值：无 void delay_1ms() {
TH1=0xfc; TL1=0x18; TR1=1; while(!TF1); TF1=0; }
// 置定时器初值
// 启动定时器 1 // 查询计数是否溢出，即定时 1ms 时间到，TF1=1 // 1ms 时间到，将定时器溢出标志位 TF1 清零
1
2
R4 10k R1
5 6
DAC0832
LM324 5.1K
4
U3:B 7
LM324
11
11
-12V
R2
R3
10k
10k
2 3 4 U3:B(OP) 5 6 7
Title: 简易波形发生器
8 Author:
Size: A4
Number:
Revision:
MSN:
+5V
五、系统软件设计 采用 DAC0832 产生锯齿波的编程思路：先输出 8 位二进制最小值零，然后按加 1 规律
21 22 23 24 25 26 27 28 CS
10 11 12 13 14 15 16 WR 17
+5V
RP1 1
DI0 2 DI1 3 DI2 4 DI3 5 DI4 6 DI5 7 DI6 8 DI7 9
10k
+5V
A
B
+5V
C
D
U2
CS WR
DI3 DI2 DI1 DI0
1 2 3 4 5 6 7 8 9 10
三角波发生器程序如下：
#include<absacc.h> #include<reg51.h> #define uchar unsigned char #define uint unsigned int #define DA0832 XBYTE[0x7fff] void delay_1ms(); void main(void) {
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,
void delay_1ms()
{
TH1=0xfc;
// 置定时器初值
TL1=0x18;
TR1=1;
// 启动定时器 1
while(!TF1);
// 查询计数是否溢出，即定时 1ms 时间到，TF1=1
TF1=0; } void main() {
uchar i; TMOD=0x10; while(1) {
TL1=0x18; TR1=1; while(!TF1); TF1=0; } 系统源程序如下：
#include<absacc.h> #include<reg51.h> #define uchar unsigned char #define uint unsigned int #define DA0832 XBYTE[0x7fff] void key2(); void key1(); void key3(); void delay_1ms() {TH1=0xfc; TL1=0x18; TR1=1;
P2.0/A8 P2.1/A9 P2.2/A10 P2.3/A11 P2.4/A12 P2.5/A13 P2.6/A14 P2.7/A15
P3.0/RXD P3.1/TXD P3.2/INT0 P3.3/INT1
P3.4/T0 P3.5/T1 P3.6/WR P3.7/RD
39 DI0 38 DI1 37 DI2 36 DI3 35 DI4 34 DI5 33 DI6 32 DI7
#define uchar unsigned char
#define uint unsigned int
#define DA0832 XBYTE[0x7fff]
//DAC0832 地址
//函数名：delay_1ms
//函数功能：延时 1ms，T1、工作方式 1，定时初值 64536
//形式参数：无
//返回值：无
我们采用 AT89C51 单片机的 P0 口和 P2 口来实行与 DAC0832 芯片间的单缓冲连接方 式，采用两级运算放大器，输出电压值 Vout 为 0~+5V。
波形发生器电路的元器件清单如下：
元件名称
参数
数量
IC 插座
DIP40
1
单片机
89C51
1
晶体振荡器 12MHZ
1
瓷片电容
30PF
2
集成运放
while(!TF1); TF1=0; } uchar code sin[]=
{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, 0xE9,0xE7,0xE5,0xE3,0xE1,0xDF,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,
0x79,0x7C,0x80};
void main()
// 主函数
{
uchar i;
TMOD=0x10;
// 置定时器 1 为方式 1
while(1)
{
for(i=0;i<=255;i++) //形成正弦输出
{
DA0832=sin[i];
//D/A 转换输出
delay_1ms();
}
}
}
//函数名：delay_1ms
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,