51做正弦波输出，怎么是会出现这个效果！！

lcalp1314

仿真没什么问题，就是上实物出现这样的问题。。。

#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long


sbit key1=P3^2;
sbit key2=P3^3;


unsigned char rate=50;
volatile uchar n=0;
unsigned char ucHigh = 0;
unsigned char ucLow = 0;

uchar code tosin[256]={
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,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,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,
0x30,0x33,0x35,0x38,0x3a,0x3d,0x40,0x43,0x45,0x48,0x4c,0x4e,
0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66 ,0x69,0x6c,0x6f,0x72,
0x76,0x79,0x7c,0x80 };/*正弦波码 */

#if 1
void Delay(uint t)
{
        uint j;
        for(;t>0;t--)
        for(j=100;j>0;j--);
}
#endif

/*******************************************************************************
函数：KeyScan()
功能：键盘扫描
返回：扫描码
*******************************************************************************/
#if 1
unsigned char KeyScan(void)
{
        unsigned char k = '\0';

        if ( !key1 ) k = '1';
        if ( !key2 ) k = '2';

        return k;
}
#endif

void main()
{

        TMOD=0x10;
        rate = 1;       
        ET1=1;
        TR1=1;       
        EA=1;

        ucHigh = (-3922/rate)/256;
        ucLow = (-3922/rate)%256;

        while(1)
        {       
                unsigned char k;
                for (;;)
                {
                        Delay(1);
                        k = KeyScan();
                        if ( k != '\0' )
                        {
                                switch(k)
                                {
                                        case '1':
                                                if (rate <= 50)
                                                {
                                                        rate += 1;
                                                }
                                                break;
                                        case '2':
                                                if (rate > 6)
                                                {
                                                        rate -= 1;
                                                }
                                                break;
                                }
                                break;
                        }
                }
                ucHigh = (-3922/rate)/256;
                ucLow = (-3922/rate)%256;
                for (;;)  //松手检测
                {
                        Delay(1);
                        if ( KeyScan() == '\0' ) break;
                }
        }
}
void t1(void) interrupt 3   using 2                //T1工作在定时状态下，
{            
        TR1=0;
        TH1=ucHigh;       
        TL1=ucLow;
        P0 = tosin[n++];         //0.2V˙秈
        TR1=1;   
}                  



实现功能就是 按键调频。。。

i55x

示波器耦合方式选择错误

lcalp1314

i55x 发表于 2012-5-31 20:29
示波器耦合方式选择错误

我当时 用函数信号发生器 接了，那个输出的正弦波也没问题呀

i55x

你先把耦合方式改对了再谈软件bug的问题。
现在是耦合方式选择错误导致示波器波形不能正确反应你的软件错误。

philoman

你正弦波表是带直流的原码,看看你的DA是原码还是补码的;

lcalp1314

好吧 只有明天再看看了。。现在示波器不在这边

linhonggui2007

我现在也在做这个，敢问楼主你的正弦波码是怎么生成的

lin562794072

正弦波码可以用vc生成

博海

不懂的我路过了