單片機課程設計--簡易波形發(fā)生器-免費閱讀
【正文】 這次設計有什么不足之處？該如何改進？答；不足之處：在外圍電路中不能隨意調(diào)制頻率。的正弦值放在數(shù)組中，通過簡單的處理就可以從數(shù)組中得到整個周期的值，然后不斷地循環(huán)即可得出正弦波。k++){ out_sin(k) }5 仿真結(jié)果及分析設個自變量i讓它不斷地自加1，直到加到255時，t=i，對t進行不斷地自減1直到減到t=0，然后再不斷地重復上述過程產(chǎn)生三角波。oid out_sin(unsigned int x){ unsigned char code_sin[]={0,0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2,2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9,9,10, 10, 11, 12, 12, 13, 14, 15, 15, 16, 17, 18, 18, 19, 20, 21,22, 23, 24, 25, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 36, 37, 38, 39, 40, 41, 42, 44, 45, 46, 47, 49, 50, 51, 52, 54, 55, 56, 57, 59, 60, 61, 63, 64, 66, 67, 68, 70, 71, 73, 74, 75, 77, 78, 80, 81, 83, 84, 86, 87, 89, 90, 92, 93, 95, 96, 98, 99, 101,102, 104, 106, 107,109, 110, 112, 113, 115, 116, 118, 120, 121, 123, 124, 126,128,129, 131, 132, 134, 135, 137, 139, 140, 142, 143, 145, 146, 148,149,151,153, 154, 156, 157, 159, 160, 162, 163, 165, 166, 168, 169, 171, 172, 174, 175, 177, 178, 180, 181, 182, 184, 185, 187, 188, 189, 191, 192, 194, 195, 196, 198, 199, 200, 201, 203, 204, 205, 206, 208, 209, 210, 211, 213, 214, 215, 216, 217, 218, 219, 220, 221, 223, 224, 225, 226, 227, 228, 229, 230, 230, 231, 232, 233, 234, 235, 236, 237, 237, 238, 239, 240, 240, 241, 242, 243, 243, 244, 245, 245, 246, 246, 247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 251, 252, 252, 253, 253, 253, 253, 254, 254,254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255,255}。將90176。從上面的要求我們可以看出，輸出的波形受到按鍵的控制。由于輸出要經(jīng)運算放大器轉(zhuǎn)換成電壓信號，對運算放大器的動態(tài)范圍要保證在—5V —+5V，要求運算放大器的電源V+=12v,V=—12V，電路如圖所示
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