基于单片机的频率测量控制系统设计(频率计)（电路+程序）

博主福利&＃xff1a;100G&＃43;电子设计学习资源包&＃xff01;

http://mp.weixin.qq.com/mp/homepage?__biz&＃61;MzU3OTczMzk5Mg&＃61;&＃61;&hid&＃61;7&sn&＃61;ad5d5d0f15df84f4a92ebf72f88d4ee8&scene&＃61;18#wechat_redirect
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频率测量方法&＃xff1a;

• 测频法&＃xff1a;测试限定时间内检测脉冲的个数&＃xff08;1s&＃xff09;
• 测周法&＃xff1a;采样N个脉冲所使用的时间

测频法实验&＃xff1a;

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设计要求&＃xff1a;

通过测频法测出时钟发生器的频率并显示在显示屏上

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实现过程&＃xff1a;

通过DCLOCK时钟发生器产生时钟频率&＃xff0c;如下图所示&＃xff0c;一秒钟产生233个频率

T0接收时钟发生器产生的脉冲&＃xff0c;使用count变量计数&＃xff0c;定时器T1完成1s后关闭中断&＃xff0c;并将此时的count显示出来

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元件清单&＃xff1a;

• AT89C51
• 7SEG-MPX8-CC-BLUE
• DCLOCK&＃xff08;在电压探针列表中&＃xff09;

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实现代码&＃xff1a;

#include
typedef unsigned int uint;
typedef unsigned char uchar;
uchar code number[] &＃61;
{0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0, 0xFE, 0xF6, 0xEE, 0x3E, 0x9C, 0x7A, 0x9E, 0x8E
};
uchar code address[] &＃61;
{0xFE, 0xFD, 0xFB, 0xF7, 0xEF, 0xDF, 0xBF, 0x7F
};
uint count &＃61; 0, time &＃61; 0, temp; //一定要用int类型,char类型只有8位,计数只到255
bit flag &＃61; 0;
void Delay(uchar m)
{while(--m);
}
int main()
{uchar i;EA &＃61; 1;ET0 &＃61; 1;ET1 &＃61; 1;TMOD &＃61; 0x16; //定时器1为方式1,计数器0为方式2,T0选择C/T&＃61;1,计数器方式,脉冲由外部提供TH0 &＃61; 0xff;TL0 &＃61; 0xff;TR0 &＃61; 1;TH1 &＃61; (65536 - 50000) / 256;TL1 &＃61; (65536 - 50000) % 256;TR1 &＃61; 1;while(1){if (flag &＃61;&＃61; 1){temp &＃61; count;for (i &＃61; 0; i <8; &＃43;&＃43;i){P2 &＃61; address[i];P1 &＃61; number[temp % 10];temp &＃61; temp / 10;Delay(500);}}}
}
void Count0()interrupt 1
{&＃43;&＃43;count;
}
void Time1()interrupt 3
{TH1 &＃61; (65536 - 50000) / 256;TL1 &＃61; (65536 - 50000) % 256;&＃43;&＃43;time;if (time &＃61;&＃61; 20){EA &＃61; 0;flag &＃61; 1;}
}