信号发生查表(函数信号发生器).doc

#include reg52.h #define uchar unsigned char#define uint unsigned intunsigned char code table=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00; /共阴极9对应进制数/=正弦波数据= uchar code sin_tab256= 128, 131, 134, 137, 140, 143, 146, 149, 152, 156, 159, 162, 165, 168, 171, 174, 176, 179, 182, 185, 188, 191, 193, 196, 199, 201, 204, 206, 209, 211, 213, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 237, 239, 240, 242, 243, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 254, 254, 253, 252, 252, 251, 250, 249, 248, 247, 246, 245, 243, 242, 240, 239, 237, 236, 234, 232, 230, 228, 226, 224, 222, 220, 218, 216, 213, 211, 209, 206, 204, 201, 199, 196, 193, 191, 188, 185, 182, 179, 176, 174, 171, 168, 165, 162, 159, 156, 152, 149, 146, 143, 140, 137, 134, 131, 127, 124, 121, 118, 115, 112, 109, 106, 103, 99, 96, 93, 90, 87, 84, 81, 79, 76, 73, 70, 67, 64, 62, 59, 56, 54, 51, 49, 46, 44, 42, 39, 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 18, 16, 15, 13, 12, 10, 9, 8, 7, 6, 5, 4, 3, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 15, 16, 18, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 42, 44, 46, 49, 51, 54, 56, 59, 62, 64, 67, 70, 73, 76, 79, 81, 84, 87, 90, 93, 96, 99, 103, 106, 109, 112, 115, 118, 121, 124,; /三角波信号数据表uchar code thr_tab32= 0x00,0x0f,0x1f,0x2f,0x3f,0x4f,0x5f,0x6f,0x7f,0x8f,0x9f,0xaf,0xbf,0xcf,0xdf,0xef, 0xff,0xef,0xdf,0xcf,0xbf,0xaf,0x9f,0x8f,0x7f,0x6f,0x5f,0x4f,0x3f,0x2f,0x1f,0x0f;/-/锯齿波信号数据表uchar code jc_tab33= 0x00,0x08,0x0f,0x18,0x1f,0x28,0x2f,0x38,0x3f,0x48,0x4f,0x58,0x5f,0x68,0x6f,0x78, 0x7f,0x88,0x8f,0x98,0x9f,0xa8,0xaf,0xb8,0xbf,0xc8,0xcf,0xd8,0xdf,0xe8,0xef,0xf8,0xff;/数码管位选控制口定义sbit LED4=P27;sbit LED3=P26;sbit LED2=P25;sbit LED1=P24;/按键口申明 sbit S1=P23;sbit S2=P22;sbit S3=P21;unsigned char tabArry4; /保存显示数据char flag=1; /按键标志，当flag=1时表示没有按下，当flag=0时表示有按键按下int keycount=0; /按键计数unsigned char waveth,wavetl; /用于对定时器付值unsigned int frecount=100; /频率计数unsigned int mbjs; /码表计数，共采个点/毫秒延时程序void delayms(int ms) uchar i; while(ms-) for(i=250;i0;i-); /键盘扫描void keyscan() if(flag=1) if(S3=0) /用S3切换波形 delayms(2); /延时去抖 if(S3=0) /按键计数,便于切换波形 flag=0; keycount+; if(keycount=4) keycount=0; /四种波形计数次 if(S2=0) /频率加处理 delayms(2); if(S2=0) flag=0; switch(keycount) case 0: /正弦波频率加 frecount+; if(frecount1000) frecount=0; break; case 1: /三角波频率加 frecount+; if(frecount1000) frecount=0; break; case 2: /锯齿波频率加 frecount+; if(frecount1000) frecount=0; break; case 3: /方波频率加 frecount+; if(frecount1000) frecount=0; break; waveth=(65536-57603/frecount)/256; /重新计算初值 wavetl=(65536-57603/frecount)%256; if(S1=0) /频率减处理 delayms(2); if(S1=0) flag=0; switch(keycount) case 0: /正弦波频率减 frecount-; if(frecount0) frecount=999; break; case 1: /三角波频率减 frecount-; if(frecount0) frecount=999; break; case 2: /锯齿波频率减 frecount-; if(frecount0) frecount=999; break; case 3: /方波频率减 frecount-; if(frecount=256) mbjs=0; else if(keycount=1) /输出三角波 P1 = thr_tabmbjs; mbjs+; if(mbjs=32) mbjs=0; else