函数发生器的c语言程序,c语言程序库函数

C语言srand(time(0))

这是用于初始化随机函数发生器的，计算机中的随机函数在生成一个随机数时需要用到一个称为随机数发生器的东西，如果不对其进行初始化，每次生成的随机数就会是相同的。

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srand函数就用来初始化这个发生器，参数time(0)能够生成从1970年1月1日到当前机器时间的秒数，这个数在你每次执行程序的时候都会不断增长、变化，所以用它当做种子来初始化发生器，就会生成不同的随机数了。

求一个正确的基于51单片机的函数信号发生器的C程序

#includereg51.h

#includeabsacc.h

#includeMAX72191.h

#defineDAC XBYTE[0x7fff] //P2.7接CS

sbitkey0 = P3^2;// 增减切换键

sbitkey1 = P3^3;//个位,十位，百位，千位的控制切换

sbitkey2 = P3^4;// 调整位

sbitkey3 = P3^5;// 波形选择正弦、三角、矩形波，锯齿波

unsignedchar i,j;

unsignedint counter,step,flag;

typedefunsigned int uint;

//定时器0初始化

voidInit_Timer0(void)

{

TMOD = (TMOD 0XF0) | 0X01;//设置工作方式和定时初始值

TH0 = 0xff;

TL0 = 0x00;

TR0 =1; //启动定时器

ET0 =1;

}

//定义输出波形的代码

unsignedchar code type[4][256]={

{ //正弦波代码

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x1, 0x1, 0x2, 0x3, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8,

0x9, 0xb,0xc, 0xd, 0xf, 0x10,0x12,0x13,0x15,0x17,0x19,0x1b,0x1d,0x1f,0x21,0x23,

0x25,0x27,0x2a,0x2c,0x2e,0x31,0x33,0x36,0x39,0x3b,0x3e,0x41,0x43,0x46,0x49,0x4c,

0x4f,0x52,0x55,0x58,0x5b,0x5e,0x61,0x64,0x67,0x6a,0x6d,0x70,0x73,0x76,0x7a,0x7d,

0x80,0x83,0x86,0x89,0x8c,0x8f,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,

0xb1,0xb4,0xb6,0xb9,0xbc,0xbf,0xc1,0xc4,0xc7,0xc9,0xcc,0xce,0xd1,0xd3,0xd5,0xd8,

0xda,0xdc,0xde,0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xeb,0xed,0xef,0xf0,0xf1,0xf3,0xf4,

0xf5,0xf6,0xf8,0xf9,0xf9,0xfa,0xfb,0xfc,0xfc,0xfd,0xfd,0xfe,0xfe,0xfe,0xfe,0xfe,

0xfe,0xfe,0xfe,0xfe,0xfe,0xfd,0xfd,0xfc,0xfc,0xfb,0xfa,0xf9,0xf9,0xf8,0xf6,0xf5,

0xf4,0xf3,0xf1,0xf0,0xef,0xed,0xeb,0xea,0xe8,0xe6,0xe4,0xe2,0xe0,0xde,0xdc,0xda,

0xd8,0xd5,0xd3,0xd1,0xce,0xcc,0xc9,0xc7,0xc4,0xc1,0xbf,0xbc,0xb9,0xb6,0xb4,0xb1,

0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99,0x96,0x93,0x8f,0x8c,0x89,0x86,0x83,0x80,

0x7d,0x7a,0x76,0x73,0x70,0x6d,0x6a,0x67,0x64,0x61,0x5e,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,0x19,0x17,0x15,0x13,0x12,0x10,0xf,0xd, 0xc, 0xb, 0x9,

0x8,0x7, 0x6, 0x5, 0x4, 0x3, 0x3, 0x2, 0x1, 0x1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

{ //三角波代码

0x2,0x4, 0x6, 0x8, 0xa, 0xc, 0xe, 0x10,0x12,0x14, 0x16, 0x18, 0x1a,0x1c, 0x1e, 0x20,

0x22,0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30,0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, 0x40,

0x42,0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50,0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60,

0x62,0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70,0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e, 0x80,

0x82,0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90,0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, 0xa0,

0xa2,0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0,0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc,0xbe, 0xc0,

0xc2,0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0,0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc,0xde, 0xe0,

0xe2,0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0,0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc,0xfe, 0xff,

0xfe,0xfc, 0xfa, 0xf8, 0xf6, 0xf4, 0xf2, 0xf0,0xee, 0xec, 0xea, 0xe8, 0xe6, 0xe4,0xe2, 0xe0,

0xde,0xdc, 0xda, 0xd8, 0xd6, 0xd4, 0xd2, 0xd0,0xce, 0xcc, 0xca, 0xc8, 0xc6, 0xc4,0xc2, 0xc0,

0xbe,0xbc, 0xba, 0xb8, 0xb6, 0xb4, 0xb2, 0xb0,0xae, 0xac, 0xaa, 0xa8, 0xa6, 0xa4,0xa2, 0xa0,

0x9e, 0x9c, 0x9a, 0x98, 0x96, 0x94, 0x92, 0x90,0x8e, 0x8c, 0x8a, 0x88, 0x86, 0x84, 0x82, 0x80,

0x7e, 0x7c, 0x7a, 0x78, 0x76, 0x74, 0x72, 0x70,0x6e, 0x6c, 0x6a, 0x68, 0x66, 0x64, 0x62, 0x60,

0x5e, 0x5c, 0x5a, 0x58, 0x56, 0x54, 0x52, 0x50,0x4e, 0x4c, 0x4a, 0x48, 0x46, 0x44, 0x42, 0x40,

0x3e, 0x3c, 0x3a, 0x38, 0x36, 0x34, 0x32, 0x30,0x2e, 0x2c, 0x2a, 0x28, 0x26, 0x24, 0x22, 0x20,

0x1e, 0x1c, 0x1a, 0x18, 0x16, 0x14, 0x12, 0x10,0xe, 0xc, 0xa, 0x8, 0x6, 0x4, 0x2, 0x00

{// 矩形脉冲波代码

0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff,

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00,

{//锯齿波代码

0x00,0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,0x08,0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,

0x10,0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,0x18,0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,

0x20,0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,0x28,0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,

0x30,0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,0x38,0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,

0x40,0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,0x48,0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,

0x50,0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,0x58,0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,

0x60,0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,0x68,0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,

0x70,0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,0x78,0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,

0x80,0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,0x88,0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,

0x90,0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,0x98,0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,

0xa0,0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,0xa8,0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,

0xb0,0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,0xb8,0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,

0xc0,0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,0xc8,0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,

0xd0,0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,0xd8,0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,

0xe0,0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,0xe8,0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,

0xf0,0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,0xf8,0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}

};

//显示子函数

Disp7219(unsignedlong dat)

{

unsigned char i;

unsigned char led[8];

led[7]=dat%10;

led[6]=dat/10%10;

led[5]=dat/100%10;

led[4]=dat/1000%10;

led[3]=dat/10000%10;

led[2]=dat/100000%10;

led[1]=dat/1000000%10;

led[0]=dat/10000000%10;

for(i=0;i8;i++)

{

max_7219(i+1, led[i]);

}

//延时约1m秒

voiddelay_ms(uint n)

{

uchar j;

while(n--)

for(j=0;j120;j++);

}

//主函数

main()

{

unsigned int f,n,j;

delay_ms(500);

Init_Max7219();//初始化7219

Disp7219(000);

Init_Timer0();

step=18;

EA = 1;

while(1)

{

if(key0 == 0) n=n+1;

if(n==2)n=0;

if(key1==0) j=j+1;

if(j==4) j=0;

if(n==0 j == 0 key2 == 0) if(step180) step+=18; //个位增

if(n==1 j == 0 key2 == 0) if(step18) step-=18; //个位减

if(n==0 j == 1 key2 == 0) if(step1800) step+=180;//十位增

if(n==1 j == 1 key2 == 0) if(step180) step-=180; //十位减

if(n==0 j == 2 key2 == 0) if(step18000) step+=1800;//百位增

if(n==1 j == 2 key2 == 0) if(step1800) step-=1800;//百位减

if(n==0 j == 3 key2 == 0) if(step54000) step+=18000;//千位增

if(n==1 j == 3 key2 == 0) if(step18000) step-=18000;//千位减

if(key3==0)flag=flag+1;if(flag==4)flag=0;

while((!key0)||(!key1)||(!key2)||(!key3));

f=step/18;

Disp7219(f);}//显示频率

}

// 定时中断服务

voidTimer0(void) interrupt 1 using 2

{

TH0 = 0xff;

TL0 = 0x00;

counter = counter + step;

DAC=type[flag][(unsignedint)counter8];

}

跪求单片机大神帮我解析下面函数信号发生器的代码（C语言）

你贴的代码里那几个数组没有用到啊，暂时不知道干什么的，初步猜测估计是液晶的点阵数据，main函数里也就是初始化了定时器和lcd液晶屏，不停的扫描按键键值，定时中断里应该还有很多东西，这里看不到。

需要问具体的话可以把程序发我邮箱吧：cxz1088cxz@vip.qq.com

简易函数信号发生器C语言编写

我没做过正弦波和三角波，我认为正弦波做的话用带DA功能的单片机，但是你没说正弦波的频率和赋值，三角波也可以用DA做，方波就很简单了用拉高活拉低口线就可以了。你直接用单片机做，不用外围电路吗？？

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关于创新互联

函数发生器的c语言程序,c语言程序库函数

C语言srand(time(0))

求一个正确的基于51单片机的函数信号发生器的C程序

跪求单片机大神帮我解析下面函数信号发生器的代码（C语言）

简易函数信号发生器C语言编写

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