數(shù)模模數(shù)轉(zhuǎn)換實(shí)驗(yàn)

1、實(shí) 驗(yàn) 報(bào) 告實(shí)驗(yàn)項(xiàng)目名稱： D/A、A/D轉(zhuǎn)換實(shí)驗(yàn) 同組人： 實(shí)驗(yàn)時(shí)間： 實(shí)驗(yàn)室： 指導(dǎo)教師： 一、實(shí)驗(yàn)?zāi)康模海╨）學(xué)習(xí)外部接口的應(yīng)用。ADC0809、DAC0832的工作方式，輸入/輸出方式的應(yīng)用。（2）熟悉Proteus軟件電路設(shè)計(jì)和Keil軟件程序調(diào)試方法。重點(diǎn)：ADC0809、DAC0832的工作方式二、實(shí)驗(yàn)頂備知識(shí)： （l）AT89S51與ADC、DAC接口的連接，ADC0809、DAC0832的基本原理。（2）Proteus軟件應(yīng)用，Keil軟件程序調(diào)試應(yīng)用。三、實(shí)驗(yàn)內(nèi)容 利用DAC0832轉(zhuǎn)換器輸出鋸齒波、三角波、方波和正弦波。1、設(shè)計(jì)要求：以DAC0832轉(zhuǎn)換器和AT89C5

2、2單片機(jī)設(shè)計(jì)仿真電路，該電路能在虛擬示波器上顯示出鋸齒波、三角波、方波和正弦波，并能用虛擬電壓表顯示輸出電壓值，要求電壓范圍為015V且周期約為510ms。2、仿真電路原理圖元器件選?。篈T89C52：單片機(jī)；RES、RX8：電阻、8排阻；CRYSTAL：晶振；CAP、CAP-ELEC：電容、電解電容；DAC0832：D/A轉(zhuǎn)換器；LM358N：運(yùn)算放大器。圖6-1 電路原理圖3、程序設(shè)計(jì)內(nèi)容程序設(shè)計(jì)首先考慮DAC0832轉(zhuǎn)換芯片的入口地址，地址的設(shè)置與接口電路的連接方式有關(guān)。P2.7端口與DAC0832的CS片選端相連，要選通DAC0832，要求CS引腳為低電平，則DAC0832的入口地址為

3、0x7FFFH。4、程序清單 #include <reg52.h>#include <ABSACC.H>#include <math.h>#define DAC0832Addr1 0x7FFF #define DAC0832Addr2 0xBFFF#define DAC0832Addr3 0xDFFF#define DAC0832Addr4 0xEFFF#define uchar unsigned char#define uint unsigned intuchar p; float f;int a; #define pi 3.1415926 void Ua

4、rt_Init( void ); void TransformData1(uchar c0832data1);void TransformData2(uchar c0832data2);void TransformData3(uchar c0832data3);void TransformData4 (uchar c0832data4);void Delay();uchar const code ZXB_code255=0x80,0x83,0x86,0x89,0x8c,0x8f,0x92,0x95,0x98,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,0xb0,0xb

5、3,0xb6,0xb9,0xbc,0xbf,0xc1,0xc4,0xc7,0xc9,0xcc,0xce,0xd1,0xd3,0xd5,0xd8,0xda,0xdc,0xde,0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xed,0xef,0xf0,0xf2,0xf3,0xf4,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfc,0xfd,0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfe,0xfd,0xfc,0xfc,0xfb,0xfa,0xf

6、9,0xf8,0xf7,0xf6,0xf5,0xf3,0xf2,0xf0,0xef,0xed,0xec,0xea,0xe8,0xe6,0xe4,0xe3,0xe1,0xde,0xdc,0xda,0xd8,0xd6,0xd3,0xd1,0xce,0xcc,0xc9,0xc7,0xc4,0xc1,0xbf,0xbc,0xb9,0xb6,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99,0x96,0x92,0x8f,0x8c,0x89,0x86,0x83,0x80,0x7d,0x79,0x76,0x73,0x70,0x6d,0x6a,0x67,0x6

7、4,0x61,0x5e,0x5b,0x58,0x55,0x52,0x4f,0x4c,0x49,0x46,0x43,0x41,0x3e,0x3b,0x39,0x36,0x33,0x31,0x2e,0x2c,0x2a,0x27,0x25,0x23,0x21,0x1f,0x1d,0x1b,0x19,0x17,0x15,0x14,0x12,0x10,0xf,0xd,0xc,0xb,0x9,0x8,0x7,0x6,0x5,0x4,0x3,0x3,0x2,0x1,0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x1,0x2,0x3,0x3,0x4,

8、0x5,0x6,0x7,0x8,0x9,0xa,0xc,0xd,0xe,0x10,0x12,0x13,0x15,0x17,0x18,0x1a,0x1c,0x1e,0x20,0x23,0x25,0x27,0x29,0x2c,0x2e,0x30,0x33,0x35,0x38,0x3b,0x3d,0x40,0x43,0x46,0x48,0x4b,0x4e,0x51,0x54,0x57,0x5a,0x5d,0x60,0x63,0x66,0x69,0x6c,0x6f,0x73,0x76,0x79;main() uchar cDigital1=0; Uart_Init();P0=0xFF;P1=0xFF;

9、P2=0xFF;P3=0xFF;Delay();while(1)for(cDigital1=0;cDigital1<255;cDigital1+) Delay(); TransformData1(cDigital1);TransformData2(255-cDigital1); TransformData3(0);TransformData4(ZXB_codecDigital1); for(cDigital1=255;cDigital1>0;cDigital1-) Delay(); TransformData1(cDigital1);TransformData2(cDigital1

10、);TransformData3(255);TransformData4(ZXB_code-(cDigital1-255); void TransformData1(uchar c0832data1) *(uchar xdata*)DAC0832Addr1)=c0832data1; void TransformData2(uchar c0832data2) *(uchar xdata*)DAC0832Addr2)=c0832data2; void TransformData3(uchar c0832data3) *(uchar xdata*)DAC0832Addr3)=c0832data3;

11、void TransformData4(uchar c0832data4) *(uchar xdata*)DAC0832Addr4)=c0832data4; void Uart_Init( void )SCON=0x52;TMOD=0x21;TCON=0x69;TH1=0xf3;void Delay()uint i; for (i=0;i<250;i+) ; ADC0809電壓模/數(shù)轉(zhuǎn)換1、設(shè)計(jì)要求：以AT89C52單片機(jī)為核心設(shè)計(jì)ADC0809模數(shù)轉(zhuǎn)換仿真電路，模擬電壓輸入由可變電位器提供。輸入電壓范圍04.99V，經(jīng)ADC0809轉(zhuǎn)換成對(duì)應(yīng)的0255通過數(shù)碼管顯示。2、仿真電路原理圖

12、元器件選?。?AT89C52：單片機(jī)；RES：電阻；CRYSTAL：12MHz晶振；CAP、CAP-ELEC：電容、電解電容；7SEG-MPX4-CC：4位七段共陰極數(shù)碼管；74LS02、74LS04、74LS74、74LS373或非門、反相位、D觸發(fā)器、地址鎖存器；POT-LIN：變阻器；ADC0809：8位A/D轉(zhuǎn)換器。圖6-2 電路原理圖3、程序設(shè)計(jì)內(nèi)容將單片機(jī)的P0.0、P0.1和P0.2通過74LS373地址鎖存器與ADC0809的ADDA、ADDB和ADDC相連接，選擇ADC0809的采集通道IN0。P2.7控制ADC0809的ALE和OE端口，因此ADC0809的地址可以定位ox

13、7FF8。4、程序清單 #include <reg52.h>#include <absacc.h>#define unit unsigned int#define uchar unsigned char#define AD XBYTE 0x7FF8sbit led1=P20;sbit led2=P21;sbit led3=P22;sbit led4=P23;sbit ad_busy=P32;bit bk=1;unsigned char ad_data, LED1, LED2, LED3;ucharcode led_segment12=0x3F,0x06,0x5B,0x4

14、F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x00,0x00; void delay(unsigned int i)while( i )i-;void display(void) LED1=ad_data%10;LED2=(ad_data/10)%10;LED3=ad_data/100;P2=0xff;delay(2);P1=led_segmentLED1; led1=0;delay(100);led1=1;if(LED3=0)&&(LED2=0) LED2=10;P1=led_segmentLED2;led2=0;delay(100);led2=1;if(LED3=0) LED3=10;P1=led_segmentLED3;led3=0;delay(100);led3=1;bk=!bk;void ad0808(void) interrupt 0 EA=0;EX0=0;ad_data=AD;EA=1;EX0=1;void main(void)EA=1