单片机数模转换器DAC0832设计实验报告

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1、实验名称：数模转换器DAC0832设计实验学生姓名：_ XX 学号： XX -班级：测控 XX 班时间:课程名称：微机机原理及应用教师：成绩：一、实验目的1) 了解DAC0832芯片引脚、内部结构及工作原理；2) 掌握应用单片机I/O端口控制DAC0832实现数模转换的方法；二、实验内容1. 通过单片机I/O端口控制DAC0832实现数模转换，控制方式采用单缓 冲方式，通过按键TRI/SIN选择输出，分别产生锯齿波、方波、正弦波。1) 绘制DAC0832与单片机接口电路原理图；2) 参考PPT课件内容，设计程序，实现信号选择输出功能；2. 扩展功能：增加按键，通过按键控制调节输出信号的频率变化

2、。接口电路图设计参考下图所示：I/112/DE3/*/Hl5U6t：DE7/i7331POQDDPQ1JAD1iTAIJ口 口 3XAD3 pn.oiP0&ftD6FiSTPOi.ftOTP2H；R2舶P竝血10FSENpz.nALEP2i,A12范PZT.ftSP1DP1.1PWCCDP12P321N1TF1.nP3.3/1RTTra.inoF1.5P1J5pa.&dtK-P1.7P3.T/FD2ATBC：51I.J1尺VIJ2RFBIDA1EKE21TRISIN羽27.UdH 1PH而uCS iniRTyccXFER皿DI4-DI1DEDDDEVREr&rrKFBDUT2GNDnun还la

3、16u_ 豆V277swiSM-SPSTSW2OP.IJPRFB三、设计参考：正弦信号数据表：uchar code sine_tab256=0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa & 0xab,0 xae,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,0xf1,0x

4、f2,0xf4, 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,0xc7,0xc

5、5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xa e,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,0x57,0x55,0x 51,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,0x29 ,0x27,0x25,0x22,0x20,0x1

6、e,0x1c,0x1a,0x18,0x16 ,0x15,0x13,0x11,0x10,0x0e,0x0d,0 x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x 00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02 ,0x02,0x03,0x04,0x05,0x0 6,0x07,0x08,0x09,0x0a,0x0b,0x0d,0x0e,0x10,0x11,0x13,0x15 ,0x16,0x18,0x1a,0x1c, 0x1e,0x20,0

7、x22,0x25,0x27,0x29,0x2b,0x2e,0x30,0x33,0x35,0x38,0x3a,0x3d,0x40,0x 43,0x45,0x48,0x4c,0x4e,0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66 ,0x69,0x6c,0x6 f,0x72,0x76,0x79,0x7c,0x80;四实验报告 实现调频功能的中断程序：void int0() interrupt 0/外部中断 0，用以控制调节延时程序次数，达到调节频率的 作用counter+; /外部中断 0 触发一次，延时程序调用次数加 1 延时程序：void delay()int

8、i;for(i=0;i10;i+) /延时子程序 锯齿波程序： #include sbit MR=P2人7;void main (void)int num;int j；MR=O;while(l)for(num =0; num sbit MR=P2人7;void main (void)unsigned char code sine_tab256=正弦波字表0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa & 0xab,0 xae,0xb1,0xb4,0xb7,0xba,0xbc,0xbf,0xc2,0xc5,

9、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, 0xf4,0xf2,0

10、xf1,0xef,0xee,0xec,0xea,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,0xdd,0xda,0xd & 0xd6,0xd4,0xd1,0xcf,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xa e,0xab,0xa&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,0x57,0x5

11、5,0x 51,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,0x29 ,0x27,0x25,0x22,0x20,0x1e,0x1c,0x1a,0x1 & 0x16,0x15,0x13,0x11,0x10,0x0e,0x0d,0 x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x 00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x0

12、3,0x04,0x05,0x0 6,0x07,0x08,0x09,0x0a,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,0x40,0x 43,0x45,0x48,0x4c,0x4e,0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66,0x69,0x6c,0x6f,0x72,0x76,0x79,0x7c,0x80；D I iinri-il c.-1 LQ-rrv*

13、CluffiBWl I调频后:int num;int j；MR=0;while(l)for(num =0; num sbit MR=P2人7;void main (void) int num;int j;MR=0;while(1)int b;for(num=0;numv=255;b+)if(num128)P1=0x00;for(j=0;jvcounter;j+)当 counter 小于 128 时，P1 输出 0x00 对应低电平 delay();elseP1=0xFF;当num大于或等于128时，P1输出0xFF对应高电平 for(j=0;jsbit MR=P2人7;sbit P2_0=P2

14、A0;sbit P2_1=P2A1；int counter=0;设置延时程序次数变量counter，调节频率unsigned char code sine_tab256=/正弦波字表0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0 xae,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,0x

15、ec,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, 0xd6,0xd4,0xd1,0xc

16、f,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xa e,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99,0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80,0 x80,0x7c,0x79,0x76,0x72,0x6f,0x6c,0x69,0x66,0x63,0x60,0x5d,0x5a,0x57,0x55,0x5 1,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,0x29, 0x27

17、,0x25,0x22,0x20,0x1e,0x1c,0x1a,0x18,0x16,0x15,0x13,0x11,0x10,0x0e,0x0d,0x 0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x0 0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x06, 0x07,0x08,0x09,0x0a,0x0b,0x0d,0x0e,0x10,0x11,0x13,0x15,0x16,0x18,0x1a,0

18、x1c,0x 1e,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,0 x72,0x76,0x79,0x7c,0x80; /正弦转换字符void delay()int i;for(i=0;i10;i+)/延时子程序void int0() interrupt 0/外部中断 0，用以控制调节延时程序次数，达到调节频率的 作用counter+;外部中

19、断0触发一次，延时程序调用次数加1void main()int num; int j;EA=1;中断总允许使能EXO=1;外部中断0使能IT0= 1 ;/外部中断0下降沿触发MR=0;/P2人7输出低电平，芯片正常工作while(1)if(P2_0=0&P2_1=1) /P2_1为高电平，P2_0为低电平输出锯齿波 for(num=0;num256;num+)P1=num; /P1 直接输出 numfor(j=0;jcounter;j+)delay(); /调用延时子程序if(P2_0=1 &P2_1=0)/P2_1为低电平，P2_0为高电平输出正弦波P1=sine_tabnum;/P1 端口

20、输出正弦波字符数组 for(j=0;jcounter;j+) delay(); /调用延时子程序if(P2_0=0&P2_1=0)|(P2_0=1&P2_1=1)/P2_1 为低电平 P2_0 为低电平 以及P2_1为高电平P2_0为高电平时输出矩形波 for(num=0;num256;num+)if(numv128)当num小于128时，P1输出0x00对应低电平P1=0x00;for(j=0;jcounter;j+) delay(); else Pl=OxFF;当num大于或等于128时，Pl输出OxFF对应低电平for(j=0;jcounter;j+)delay();五总结在该实验的设计过程中，首先单独写出锯齿波、正弦波以及方波的程序，并 写出延时程序以及外部中断0程序。其中，中断程序的功能为实现波形的调频功 能，通过控制外部中断的触发次数 counter 来改变延时程序的调用次数从而实现 调频功能。在最后的程序整合过程中，通过控制开关 P2_0 及 P2_1 端口的高低 电平来实现不同波形的输出(P2_1为低电平，P2_0为高电平输出正弦波，P2_1 为高电平，P2_0为低电平输出锯齿波，P2_1为低电平P2_0为低电平以及P2_1 为高电平P2_0为高电平时输出方波)，此功能通过讦语句的查询方式实现。