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      1. 新聞中心

        avr定時(shí)器做的正弦波

        作者: 時(shí)間:2016-11-11 來(lái)源:網(wǎng)絡(luò) 收藏
        實(shí)物照片如下


        RC電路的電阻為1K與10K時(shí)的波形分別如下

        本文引用地址:http://www.biyoush.com/article/201611/316845.htm





        仿真圖片如下:






        程序如下:


        #include
        #include
        #define uchar unsigned char
        uchar auc_SinParam[128] = {
        128,134,140,147,153,159,165,171,177,182,188,193,198,204,208,213,
        218,222,226,230,233,237,240,242,245,247,249,251,252,253,254,254,
        254,254,253,252,251,250,248,246,244,241,238,235,232,228,224,220,
        215,211,206,201,196,191,185,179,174,168,162,156,150,144,137,131,
        125,119,112,106,100,94,88,82,77,71,65,60,55,50,45,41,
        36,32,28,24,21,18,15,12,10,8,6,5,4,3,2,2,
        2,2,3,4,5,7,9,11,14,16,19,23,26,30,34,38,
        43,48,52,57,63,68,74,79,85,91,97,103,109,116,122,128}; // 128點(diǎn)正弦波樣本值

        uchar x_SW = 8,X_LUT = 0;

        #pragma interrupt_handler timer0_ovf_isr:iv_TIM0_OVF
        void timer0_ovf_isr(void)
        {
        X_LUT += x_SW; // 新樣點(diǎn)指針
        if (X_LUT > 127) X_LUT -= 128;// 樣點(diǎn)指針調(diào)整
        OCR0 = auc_SinParam[X_LUT];// 取樣點(diǎn)指針到比較匹配寄存器
        }

        void main(void)
        {
        CLI(); //關(guān)閉所有中斷
        DDRB=0x08;// PB3輸出方式,作為OC0輸出PWM波
        TCCR0=0x69;
        OCR0=128;
        TIMSK=0x01;// 允許T/C0溢出中斷
        SEI();// 開(kāi)放全局中斷
        while(1)
        {};
        }



        關(guān)鍵詞: avr定時(shí)器正弦

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