【導(dǎo)讀】行濾波和整波，分別得到相應(yīng)頻率的方波、三角波和鋸齒波。設(shè)計過程主要通過。軟件Multisim設(shè)計與仿真。按鍵LCD顯示控制模塊、濾波模塊等構(gòu)成的DDS函數(shù)信號發(fā)生器。d、幅度范圍：20mVp-p～10Vp-p；e、可測試外部輸入信號的頻率。頻率測量范圍：1Hz～100MHz；e、其他功能與性能。C51語言對設(shè)計進行描述，并下載到實驗板上調(diào)試成功。片介紹），畫出程序流程框圖，并打印有注釋的源文件。并談?wù)劥舜螌嶒灥氖斋@、能為我們做實驗帶來很多方便。但是當我們在使用信號發(fā)生器的時候，幾乎沒有。因此，我們組選擇這個題目，希望利用我們已學(xué)到的知識，親手做一個信。號發(fā)生器，同時，也更深一步的探索信號發(fā)生器的工作原理。直接合成所需波形的一種頻率合成技術(shù)。一個直接數(shù)字頻率合成器又相位累加。器、加法器、波形儲存ROM、D/A轉(zhuǎn)換器和低通濾波器構(gòu)成。

　　

【正文】 00,0x04,0x04,0xFC,0x04,0x04,0x00,0x00, /*J */ 0x00,0x00,0x10,0x10,0x1F,0x10,0x10,0x00,0x03,0x01,0x01,0x01,0xFE,0x00,0x00,0x00, /*K */ 0x10,0x1F,0x11,0x03,0x14,0x18,0x10,0x00,0x04,0xFC,0x04,0x80,0x64,0x1C,0x04,0x00, /*L */ 0x10,0x1F,0x10,0x00,0x00,0x00,0x00,0x00,0x04,0xFC,0x04,0x04,0x04,0x04,0x0C,0x00, /*M */ 0x10,0x1F,0x1F,0x00,0x1F,0x1F,0x10,0x00,0x04,0xFC,0x00,0xFC,0x00,0xFC,0x04,0x00, /*N */ 0x10,0x1F,0x0C,0x03,0x00,0x10,0x1F,0x10,0x04,0xFC,0x04,0x00,0xE0,0x18,0xFC,0x00, /*O */ 0x07,0x08,0x10,0x10,0x10,0x08,0x07,0x00,0xF0,0x08,0x04,0x04,0x04,0x08,0xF0,0x00, /*P */ 0x10,0x1F,0x10,0x10,0x10,0x10,0x0F,0x00,0x04,0xFC,0x84,0x80,0x80,0x80,0x00,0x00, /*Q */ 0x07,0x08,0x10,0x10,0x10,0x08,0x07,0x00,0xF0,0x18,0x24,0x24,0x1C,0x0A,0xF2,0x00, /*R */ 0x10,0x1F,0x11,0x11,0x11,0x11,0x0E,0x00,0x04,0xFC,0x04,0x00,0xC0,0x30,0x0C,0x04, /*S */ 0x00,0x0E,0x11,0x10,0x10,0x10,0x1C,0x00,0x00,0x1C,0x04,0x84,0x84,0x44,0x38,0x00, /*T */ 0x18,0x10,0x10,0x1F,0x10,0x10,0x18,0x00,0x00,0x00,0x04,0xFC,0x04,0x00,0x00,0x00, /*U */ 0x10,0x1F,0x10,0x00,0x00,0x10,0x1F,0x10,0x00,0xF8,0x04,0x04,0x04,0x04,0xF8,0x00, /*V */ 0x10,0x1E,0x11,0x00,0x00,0x13,0x1C,0x10,0x00,0x00,0xE0,0x1C,0x70,0x80,0x00,0x00, /*W */ 0x1F,0x10,0x00,0x1F,0x00,0x10,0x1F,0x00,0xC0,0x3C,0xE0,0x00,0xE0,0x3C,0xC0,0x00, /*X */ 0x10,0x18,0x16,0x01,0x01,0x16,0x18,0x10,0x04,0x0C,0x34,0xC0,0xC0,0x34,0x0C,0x04, /*Y */ 0x10,0x1C,0x13,0x00,0x13,0x1C,0x10,0x00,0x00,0x00,0x04,0xFC,0x04,0x00,0x00,0x00, /*Z */ 0x08,0x10,0x10,0x10,0x13,0x1C,0x10,0x00,0x04,0x1C,0x64,0x84,0x04,0x04,0x18,0x00, /*[ */ 0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00,0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00, /*\ */ 0x00,0x30,0x0C,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x60,0x1C,0x03,0x00, /*] */ 0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00,0x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00, /*^ */ 0x00,0x00,0x20,0x40,0x40,0x40,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*_ */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01, /*` */ 0x00,0x40,0x40,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*a */ 0x00,0x00,0x01,0x01,0x01,0x01,0x00,0x00,0x00,0x98,0x24,0x44,0x44,0x44,0xFC,0x04, /*b */ 0x10,0x1F,0x00,0x01,0x01,0x00,0x00,0x00,0x00,0xFC,0x88,0x04,0x04,0x88,0x70,0x00, /*c */ 0x00,0x00,0x00,0x01,0x01,0x01,0x00,0x00,0x00,0x70,0x88,0x04,0x04,0x04,0x88,0x00, /*d */ 0x00,0x00,0x00,0x01,0x01,0x11,0x1F,0x00,0x00,0x70,0x88,0x04,0x04,0x08,0xFC,0x04, /*e */ 0x00,0x00,0x01,0x01,0x01,0x01,0x00,0x00,0x00,0xF8,0x44,0x44,0x44,0x44,0xC8,0x00, /*f */ 0x00,0x01,0x01,0x0F,0x11,0x11,0x11,0x18,0x00,0x04,0x04,0xFC,0x04,0x04,0x00,0x00, /*g */ 0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x00,0x00,0xD6,0x29,0x29,0x29,0xC9,0x06,0x00, /*h */ 0x10,0x1F,0x00,0x01,0x01,0x01,0x00,0x00,0x04,0xFC,0x84,0x00,0x00,0x04,0xFC,0x04, /*i */ 0x00,0x01,0x19,0x19,0x00,0x00,0x00,0x00,0x00,0x04,0x04,0xFC,0x04,0x04,0x00,0x00, /*j */ 0x00,0x00,0x00,0x01,0x19,0x19,0x00,0x00,0x00,0x03,0x01,0x01,0x01,0xFE,0x00,0x00, /*k */ 0x10,0x1F,0x00,0x00,0x01,0x01,0x01,0x00,0x04,0xFC,0x24,0x40,0xB4,0x0C,0x04,0x00, /*l */ 0x00,0x10,0x10,0x1F,0x00,0x00,0x00,0x00,0x00,0x04,0x04,0xFC,0x04,0x04,0x00,0x00, /*m */ 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x00,0x04,0xFC,0x04,0x00,0xFC,0x04,0x00,0xFC, /*n */ 0x01,0x01,0x00,0x01,0x01,0x01,0x00,0x00,0x04,0xFC,0x84,0x00,0x00,0x04,0xFC,0x04, /*o */ 0x00,0x00,0x01,0x01,0x01,0x01,0x00,0x00,0x00,0xF8,0x04,0x04,0x04,0x04,0xF8,0x00, /*p */ 0x01,0x01,0x00,0x01,0x01,0x00,0x00,0x00,0x01,0xFF,0x85,0x04,0x04,0x88,0x70,0x00, /*q */ 0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x00,0x00,0x70,0x88,0x04,0x04,0x05,0xFF,0x01, /*r */ 0x01,0x01,0x01,0x00,0x01,0x01,0x01,0x00,0x04,0x04,0xFC,0x84,0x04,0x00,0x80,0x00, /*s */ 0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x00,0x00,0xCC,0x24,0x24,0x24,0x24,0x98,0x00, /*t */ 0x00,0x01,0x01,0x07,0x01,0x01,0x00,0x00,0x00,0x00,0x00,0xF8,0x04,0x04,0x00,0x00, /*u */ 0x01,0x01,0x00,0x00,0x00,0x01,0x01,0x00,0x00,0xF8,0x04,0x04,0x04,0x08,0xFC,0x04, /*v */ 0x01,0x01,0x01,0x00,0x00,0x01,0x01,0x01,0x00,0x80,0x70,0x0C,0x10,0x60,0x80,0x00, /*w */ 0x01,0x01,0x00,0x01,0x00,0x01,0x01,0x01,0xF0,0x0C,0x30,0xC0,0x30,0x0C,0xF0,0x00, /*x */ 0x00,0x01,0x01,0x00,0x01,0x01,0x01,0x00,0x00,0x04,0x8C,0x74,0x70,0x8C,0x04,0x00, /*y */ 0x01,0x01,0x01,0x00,0x00,0x01,0x01,0x01,0x01,0x81,0x71,0x0E,0x18,0x60,0x80,0x00, /*z */ 0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x00,0x00,0x84,0x0C,0x34,0x44,0x84,0x0C,0x00, /*{ */ 0x00,0x00,0x00,0x00,0x01,0x3E,0x40,0x40,0x00,0x00,0x00,0x00,0x00,0xFC,0x02,0x02, /*| */ 0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00, /*} */ 0x00,0x40,0x40,0x3E,0x01,0x00,0x00,0x00,0x00,0x02,0x02,0xFC,0x00,0x00,0x00,0x00, /*~ */ 0x00,0x60,0x80,0x80,0x40,0x40,0x20,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }。 ////*****************************判忙函數(shù) ***********************//// void check_busy() { uchar read_data=0xff。 clear_rs()。 set_rw()。 clear_cs()。 LCD_DIN_EN 。 do { set_en()。 delaynum(1)。 delaynum(1)。 read_data=lcddata_in。 clear_en()。 }while(read_dataamp。0x80)。 set_cs()。 LCD_DOUT_EN。 } ////************************寫數(shù)據(jù)函數(shù) ************************//// void write_data(unsigned long dat) { check_busy()。 set_rs()。 clear_rw()。 clear_cs()。 lcddata_out=(dat16)|0XFF000000。 set_en()。 delaynum(1)。 delaynum(1)。 clear_en()。