生成锯齿波的采样数值，存放在juchi[]里面，从0-256

生成锯齿波的采样数值，可以用如下的代码实现，将采样值存放在juchi[]数组中：

int juchi[257];  // 定义存放采样值的数组

void generateSawtoothWave() {
    int i;
    for (i = 0; i <= 256; i++) {
        juchi[i] = i;
    }
}

上述代码中，generateSawtoothWave()函数通过循环生成了0到256之间的连续整数，即锯齿波的采样数值，并将这些数值存放在juchi[]数组中。生成的锯齿波是单调递增的，即从0开始逐渐增加到最大值256，然后重新从0开始。如果需要生成单调递减的锯齿波，可以将循环中的j编号改为j = 256 - i。

相关问题

#include <reg51.h> #include "ABSACC.H" #include "INTRINS.H" #define IN0 0x7000 sbit CS=P2^0; sbit sclk = P2^1; sbit din = P2^2; sbit fang=P1^0; sbit sin=P1^1; sbit sanjiao=P1^2; sbit jc=P1^3; unsigned char code zhx[]={64,67,70,73,76,79,82,85,88,91,94,96, 99,102,104,106,109,111,113,115,117,118,120,121,123,124,125,126, 126,127,127,127,127,127,127,127,126,126,125,124,123,121,120,118, 117,115,113,111,109,106,104,102,99,96,94,91,88,85,82,79,76,73,70, 67,64,60,57,54,51,48,45,42,39,36,33,31,28,25,23,21,18,16,14,12,10, 9,7,6,4,3,2,1,0,1,2,3,4,6,7,9,10,12,14,16,18,21, 23,25,28,31,33,36,39,42,45,48,51,54,57,60}; unsigned char code table[] = { 0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0, 0xFE, 0xF6, 0xEE, 0x3E, 0x9C, 0x7A, 0x9E, 0x8E}; unsigned char Volt; unsigned char Volt1; void putch(unsigned char n) { SBUF=n; while(TI==0); TI=0; } void Selfdelay(unsigned char n) { unsigned i; while(n--) for(i=150;i>0;i--); } void disp(unsigned char Volt) { unsigned char i,j; i=table[Volt/10]|0x01; j=table[Volt%10]; putch(i); putch(j); Selfdelay(200); } void transition() { XBYTE[IN0]=0; Selfdelay(300); Volt=XBYTE[IN0]; Volt1=Volt*50/0xff; disp(Volt1); Selfdelay(500); } void conv(unsigned int q) { unsigned char i; q <<= 6; sclk = 0; CS = 1; CS = 0; for(i=0;i<12;i++) { din=(bit)(q & 0x8000); sclk=1; q <<= 1; sclk=0; } sclk=0; CS=1; } void juchi(){ int i=0; for(i=0;i<=500;i++) { conv(i); } } void sjb() { int i=0; for(i=0;i<=500;i++) { conv(i); } for(i=500;i>=0;i--) { conv(i); } } void fb() { conv(Volt); transition(); conv(0); transition(); } void zxhs() { int i = 0; for(i=0;i<=120;i++) { conv(zhx[i]); } } void main() { SCON=0x00; TI=0; while(1) { fb(); } }改进上述程序，使其能够调节波形

要实现波形的调节，可以在程序中添加一个变量来控制波形的形状，然后根据变量的值不同输出不同的波形。例如，可以添加一个变量waveType，用来表示波形的类型，然后在transition()函数中根据waveType的值输出不同的波形。

以下是修改后的程序，添加了波形调节功能：

#include <reg51.h> 
#include "ABSACC.H" 
#include "INTRINS.H" 

#define IN0 0x7000 

sbit CS   = P2^0; 
sbit sclk = P2^1; 
sbit din  = P2^2; 

sbit fang    = P1^0; 
sbit sin     = P1^1; 
sbit sanjiao = P1^2; 
sbit jc      = P1^3;  

unsigned char code zhx[] = {
    64,67,70,73,76,79,82,85,88,91,94,96,
    99,102,104,106,109,111,113,115,117,118,
    120,121,123,124,125,126,126,127,127,127,
    127,127,127,127,126,126,125,124,123,121,
    120,118,117,115,113,111,109,106,104,102,
    99,96,94,91,88,85,82,79,76,73,70,
    67,64,60,57,54,51,48,45,42,39,36,
    33,31,28,25,23,21,18,16,14,12,10,
    9,7,6,4,3,2,1,0,1,2,3,
    4,6,7,9,10,12,14,16,18,21, 
    23,25,28,31,33,36,39,42,45,48, 
    51,54,57,60
};  

unsigned char code table[] = {
    0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0,
    0xFE, 0xF6, 0xEE, 0x3E, 0x9C, 0x7A, 0x9E, 0x8E
};

unsigned char Volt;
unsigned char Volt1;
unsigned char waveType = 0; // 波形类型，0表示正弦波，1表示方波，2表示三角波

void putch(unsigned char n) {
    SBUF = n;
    while(TI == 0);
    TI = 0;
}

void Selfdelay(unsigned char n) {
    unsigned int i;
    while(n--) {
        for(i = 150; i > 0; i--);
    }
}

void disp(unsigned char Volt) {
    unsigned char i, j;
    i = table[Volt / 10] | 0x01;
    j = table[Volt % 10];
    putch(i);
    putch(j);
    Selfdelay(200);
}

void transition() {
    XBYTE[IN0] = 0;
    Selfdelay(300);
    Volt = XBYTE[IN0];
    Volt1 = Volt * 50 / 0xff;

    if(waveType == 0) { // 正弦波
        conv(zhx[Volt1]);
    } else if(waveType == 1) { // 方波
        if(Volt1 < 25) {
            conv(0);
        } else {
            conv(255);
        }
    } else if(waveType == 2) { // 三角波
        if(Volt1 < 25) {
            conv(Volt1 * 10);
        } else {
            conv((50 - Volt1) * 10);
        }
    }

    transition();
    conv(0);
    transition();
}

void conv(unsigned int q) {
    unsigned char i;
    q <<= 6;
    sclk = 0;
    CS = 1;
    CS = 0;
    for(i = 0; i < 12; i++) {
        din = (bit)(q & 0x8000);
        sclk = 1;
        q <<= 1;
        sclk = 0;
    }
    sclk = 0;
    CS = 1;
}

void juchi() {
    int i = 0;
    for(i = 0; i <= 500; i++) {
        conv(i);
    }
}

void sjb() {
    int i = 0;
    for(i = 0; i <= 500; i++) {
        conv(i);
    }
    for(i = 500; i >= 0; i--) {
        conv(i);
    }
}

void fb() {
    conv(Volt);
    transition();
}

void zxhs() {
    int i = 0;
    for(i = 0; i <= 120; i++) {
        conv(zhx[i]);
    }
}

void main() {
    SCON = 0x00;
    TI = 0;

    while(1) {
        // 调节波形类型
        if(fang == 0) { // 方波
            waveType = 1;
        } else if(sanjiao == 0) { // 三角波
            waveType = 2;
        } else {
            waveType = 0;
        }

        fb();
    }
}

在程序中添加了一个变量waveType，用来表示波形的类型，然后在transition()函数中根据waveType的值输出不同的波形。在main函数中，可以通过按下不同的按键来切换波形类型。按下方波按键后，波形类型变为1，表示输出方波；按下三角波按键后，波形类型变为2，表示输出三角波；否则波形类型为0，表示输出正弦波。