产生方波锯齿波.doc

一、实验目的和要求
1、掌握单片机与DAC0832的接口设计方法 。
2、掌握Proteus软件与Keil软件的使用方法 。
二、设计要求
1、用Proteus软件画出电路原理图，在单片机的外部扩展片
外三总线，并通过片外三总线与0832接口。
2、在单片机的外部扩展一个4个按键的键盘。
3、按下K0，产生连续方波信号。
4、按下K1，产生连续锯齿波信号。
5、按下K2，产生连续三角波信号。
6、按下K3，产生连续正弦波信号。
7、编程实现产生连续梯形波信号。
8、通过外接示波器观察波形。
三、 电路原理图

四、 实验程序流程框图和程序清单

主程序：

方波：

锯齿波：

三角波:

正弦波：

梯形波：

汇编程序如下所示：
ORG 0000H
LJMP MAIN
ORG 0030H
MAIN: LCALL KEY
CJNE R5, #00H, MAIN1
SJMP MAIN
MAIN1: CJNE R5, #01H, KEY1
LCALL FB
KEY1: CJNE R5, #02H, KEY2
LCALL JCB
KEY2: CJNE R5, #04H, KEY3
LCALL SJB
KEY3: CJNE R5, #08H, KEY4
LCALL ZXB
KEY4: CJNE R5, #10H, MAIN1
LCALL TXB
LJMP MAIN

KEY: PUSH ACC
LCALL KS
MOV A, R5
JZ LK1
LCALL DELAY
LCALL KS
MOV A, R5
JZ LK1
LOOP2: LCALL KS
CJNE R5, #00H, LOOP2
MOV R5, A
LK1: POP ACC
RET

KS: PUSH ACC
MOV A, P1
CPL A
MOV R5, A
ANL A, #01FH
MOV R5, A
POP ACC
RET

DELAY: MOV R7, #01H
DL1: MOV R6, #26H
DL0: MOV R5, #82H
DJNZ R5, $
DJNZ R6, DL0
DJNZ R7, DL1
RET

FB: MOV DPTR, #0FFFEH
MOV A, #0FFH
FB1: MOVX @DPTR, A
LCALL DELAY
CPL A
MOVX @DPTR, A
LCALL DELAY
LCALL KEY
CJNE R5, #00H, EXIT1
LJMP FB1
EXIT1: RET

JCB: MOV DPTR, #0FFFEH
MOV A, #00H
UP: MOVX @DPTR, A
INC A
LCALL KEY
CJNE R5, #00H, EXIT2
LJMP UP
EXIT2: RET

SJB: MOV DPTR, #0FFFEH
MOV A, #00H
SJB1: MOVX @DPTR, A
INC A
LCALL KEY
CJNE R5, #00H, EXIT3
CJNE A, #0FFH, SJB1
TOP: MOVX @ DPTR, A
DEC A
LCALL KEY
CJNE R5, #00H, EXIT3
CJNE A, #00H, TOP
LJMP SJB1
EXIT3: RET

ZXB: MOV DPTR, #0FFFEH
MOV R1, #00H
LOOP1: MOV A, R1
MOV DPTR, #TAB
MOVC A, @A+DPTR
MOV DPTR, #0FFFEH
MOVX @DPTR, A
INC R1
LCALL KEY
CJNE R5, #00H, EXIT4
LJMP LOOP1
EXIT4: RET

TXB: MOV DPTR, #0FFFEH
MOV A, #00H
UPT : MOVX @DPTR, A
INC A
NOP
CJNE A, #0FFH, UPT
LCALL DELAY
DOWN: DEC A
MOVX @DPTR, A
NOP
CJNE A, #00H, DOWN
LCALL DELAY
LCALL KEY
CJNE R5, #00H, EXIT5
LJMP UPT
EXIT5: RET

TAB:
DB 07FH,082H,085H,088H,08BH,08FH,092H,095H,098H,09BH,09EH,0A1H,0A4H,
DB 0A7H,0AAH,0ADH0B0H,0B3H,0B6H,0B8H,0BBH,0BEH,0C1H,0C3H,0C6H,0C8H,
DB 0CBH,0CDH,0D0H,0D2H,0D5H,0D7H0D9H,0DBH,0DDH,0E0H,0E2H,0E4H,0E5H,
DB 0E7H,0E9H,0EBH,0ECH,0EEH,0EFH,0F1H,0F2H,0F40F5H,0F6H,0F7H,0F8H,0F9H,
DB 0FAH,0FBH,0FBH,0FCH,0FDH,0FDH,0FEH,0FEH,0FEH,0FEH,0FEH0FEH,0FEH,
DB 0FEH,0FEH,0FEH,0FEH,0FDH,0FDH,0FCH,0FBH,0FBH,0FAH,0F9H,0F8H,0F7H,
DB 0F6H0F5H,0F4H,0F2H,0F1H,0EFH,0EEH,0ECH,0EBH,0E9H,0E7H,0E5H,0E4H,0E2H,
DB 0E0H,0DDH,0DBH0D9H,0D7H,0D5H,0D2H,0D0H,0CDH,0CBH,0C8H,0C6H,0C3H,
DB 0C1H,0BEH,0BBH,0B8H,0B6H,0B3H0B0H,0ADH,0AAH,0A7H,0A4H,0A1H,09EH,
DB 09BH,098H,095H,092H,08FH,08BH,088H,085H,082H07FH,07CH,079H,076H,073H,
DB 06FH,06CH,069H,066H,063H,060H,05DH,05AH,057H,054H,051H04EH,04BH,048H,
DB 046H,043H,040H,03DH,03BH,038H,036H,033H,031H,02EH,02CH,029H,027H025H,
DB 023H,021H,01EH,01CH,01AH,019H,017H,015H,013H,012H,010H,00FH,00DH,00CH,
DB 00AH009H,008H,007H,006H,005H,004H,003H,003H,002H,001H,001H,000H,000H,
DB 000H,000H,000H000H,000H,000H,000H,000H,000H,001H,001H,002H,003H,003H,
DB 004H,005H,006H,007H,008H009H,00AH,00CH,00DH,00FH,010H,012H,013H,015H,
DB 017H,019H,01AH,01CH,01EH,021H,023H025H,027H,029H,02CH,02EH,031H,033H,
DB 036H,038H,03BH,03DH,040H,043H,046H,048H,04BH04EH,051H,054H,057H,
DB 05AH,05DH,060H,063H,066H,069H,06CH,06FH,073H,076H,079H,07CH
END
C语言程序如下:
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
#include <absacc.h>
#define DAC XBYTE[0x0FFFE]
uchar jz;
unsigned char code
zxb[]={0x7F,0x82,0x85,0x88,0x8B,0x8F,0x92,0x95,0x98,0x9B,0x9E,0xA1,0xA4,0xA7,0xAA,0xAD,0xB0,0xB3,0xB6,0xB8,0xBB,0xBE,0xC1,0xC3,0xC6,0xC8,0xCB,0xCD,0xD0,0xD2,0xD5,0xD7,0xD9,0xDB,0xDD,0xE0,0xE2,0xE4,0xE5,0xE7,0xE9,0xEB,0xEC,0xEE,0xEF,0xF1,0xF2,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFB,0xFC,0xFD,0xFD,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFD,0xFD,0xFC,0xFB,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6,0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEB,0xE9,0xE7,0xE5,0xE4,0xE2,0xE0,0xDD,0xDB,0xD9,0xD7,0xD5,0xD2,0xD0,0xCD,0xCB,0xC8,0xC6,0xC3,0xC1,0xBE,0xBB,0xB8,0xB6,0xB3,0xB0,0xAD,0xAA,0xA7,0xA4,0xA1,0x9E,0x9B,0x98,0x95,0x92,0x8F,0x8B,0x88,0x85,0x82,0x7F,0x7C,0x79,0x76,0x73,0x6F,0x6C,0x69,0x66,0x63,0x60,0x5D,0x5A,0x57,0x54,0x51,0x4E,0x4B,0x48,0x46,0x43,0x40,0x3D,0x3B,0x38,0x36,0x33,0x31,0x2E,0x2C,0x29,0x27,0x25,0x23,0x21,0x1E,0x1C,0x1A,0x19,0x17,0x15,0x13,0x12,0x10,0x0F,0x0D,0x0C,0x0A,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x03,0x02,0x01,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x02,0x03,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0C,0x0D,0x0F,0x10,0x12,0x13,0x15,0x17,0x19,0x1A,0x1C,0x1E,0x21,0x23,0x25,0x27,0x29,0x2C,0x2E,0x31,0x33,0x36,0x38,0x3B,0x3D,0x40,0x43,0x46,0x48,0x4B,0x4E,0x51,0x54,0x57,0x5A,0x5D,0x60,0x63,0x66,0x69,0x6C,0x6F,0x73,0x76,0x79,0x7C};//正弦波数据代码
void delay_10ms()
{ char a,b,c;
for(c=1;c>0;c--)
for(b=38;b>0;b--)
for(a=130;a>0;a--);
}
uchar keych(void)
{
uchar i;
i=P1;
i=~i;
i=i&0x1f;
return (i);
}
uchar key(void)
{
uchar i,d;
i=keych();
if(i!=0)
{ delay_10ms();
i=keych();
if(i!=0)
{ i=keych();
d=i;
while(i!=0)
{ delay_10ms();
i=keych();
}
i=d;
}
}
return (i);
}
void fangbo(void)
{
uchar i,j;
for(i=255;i>0&&jz==0;i--)
{ j=0;
DAC=j;
jz=key();
}
for(i=255;i>0&&jz==0;i--)
{ j=255;
DAC=j;
jz=key();
}
}
void juchibo(void)
{
uchar i,j;
j=0;
for(i=255;i>0&&jz==0;i--)
{
DAC=j;
j++;
jz=key();
}
}
void sanjiaobo(void)
{
uchar i,j;
j=0;
for(i=255;i>0&&jz==0;i--)
{
DAC=j;
j++;
jz=key();
}
for(i=255;i>0&&jz==0;i--)
{
DAC=j;
j--;
jz=key();
}
}
void zhengxianbo(void)
{
uchar i,j;
j=0;
for(i=255;i>0&&jz==0;i--)
{
DAC=zxb[j];
j++;
jz=key();
}
}
void tixingbo(void)
{
uchar i,j;
j=0;
For(i=255;i>0&&jz==0;i--)
{
DAC=j;
j++;
jz=key();
}
delay_10ms();
for(i=255;i>0&&jz==0;i--)
{
DAC=j;
j--;
jz=key();
}
delay_10ms();
}

void main()
{ jz=key();
while(1)
{
switch(jz)
{case 0:break;
case 1:jz=0;while(jz==0)
{fangbo();}break;
case 2:jz=0;while(jz==0)
{juchibo();}break;
case 4:jz=0;while(jz==0)
{sanjiaobo();}break;
case 8:jz=0;while(jz==0)
{zhengxianbo();}break;
case 16:jz=0;while(jz==0)
{tixingbo();}break;

}
}
}

六、 实验总结
本次实验使用了DAC0832产生各种波形，是一次综合性实验。其中有显示模块、键盘模块等。通过本次实验我掌握单片机与DAC0832的接口设计方法，也学会了对DAC0832进行编写程序实验过程中程序中产生问题，通过KEIL的调试解决了问题我掌握Proteus软件与Keil软件的使用方法 。