STC15频率产生器（粗调+微调+数码管显示）完整代码

本文介绍了一个基于51单片机的频率设定与显示系统的设计与实现。系统通过键盘输入目标频率，利用定时器进行精确的时间测量，并在LED显示器上实时显示当前频率。文章详细阐述了系统的硬件配置、软件流程以及频率调整算法。

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#include "stc15.h"
#include "intrins.h"
#include "gpio.h"
#include "595hc.h"
#define MAIN_Fosc 11059200L //定义主时钟
u16 counter = 0;
u8 countdown = 5;
u16 i,j,k;
bit start_flag = 0;
bit next_flag = 0;
bit confirm_flag = 0;
bit up = 0;
bit down = 0;
u16 Fre_input = 0;
u16 Fre_counter = 0;
u8 code start[8] = {
	1,22,24,25,26,17,17,17
}
;
// Y P04 P05 P06 P07
// | | | |
// X | | | |
// P00 ---- K00 ---- K01 ---- K02 ---- K03 ----
// | | | |
// P01 ---- K04 ---- K05 ---- K06 ---- K07 ----
// | | | |
// P02 ---- K08 ---- K09 ---- K10 ---- K11 ----
// | | | |
// P03 ---- K12 ---- K13 ---- K14 ---- K15 ----
// | | | |
u8 KeyCode = 0;
//给用户使用的键码, 1~16有效
u8 IO_KeyState = 0, IO_KeyState1 = 0, IO_KeyHoldCnt = 0;
//行列键盘变量
static u8 get_flag = 1;
void IO_KeyDelay(void) {
	i = 60;
	while (--i);
}
void IO_KeyScan(void) //50ms call {
	j = IO_KeyState1;
	//保存上一次状态
	P0 = 0xf0;
	//X低，读Y
	IO_KeyDelay();
	IO_KeyState1 = P0 & 0xf0;
	P0 = 0x0f;
	//Y低，读X
	IO_KeyDelay();
	IO_KeyState1 |= (P0 & 0x0f);
	IO_KeyState1 ^= 0xff;
	//取反
	if (j == IO_KeyState1) //连续两次读相等 {
		j = IO_KeyState;
		IO_KeyState = IO_KeyState1;
		if (IO_KeyState != 0) //有键按下 {
			F0 = 0;
			if (j == 0) F0 = 1;
			//第一次按下 else if (j == IO_KeyState) {
				if (++IO_KeyHoldCnt >= 20) //1秒后重键 {
					IO_KeyHoldCnt = 18;
					F0 = 1;
				}
			}
			if (F0) {
				next_flag = 1;
				switch(IO_KeyState) {
					case 0x11: get_flag = 0 ;
					break;
					//0
					case 0x12: get_flag = 1 ;
					break;
					//1
					case 0x14: get_flag = 2 ;
					break;
					//2
					case 0x18: get_flag = 3 ;
					break;
					//3
					case 0x21: get_flag = 4 ;
					break;
					//4
					case 0x22: get_flag = 5 ;
					break;
					//5
					case 0x24: get_flag = 6 ;
					break;
					//6
					case 0x28: get_flag = 7 ;
					break;
					//7
					case 0x41: get_flag = 8 ;
					break;
					//8
					case 0x42: get_flag = 9 ;
					break;
					//9
					case 0x44: get_flag = 10 ;
					break;
					//a
					case 0x48: get_flag = 11 ;
					break;
					//b
					case 0x81: get_flag = 12 ;
					break;
					//c
					case 0x82: up = 1 ;
					break;
					//d
					case 0x84: down = 1 ;
					break;
					//e
					case 0x88: IAP_CONTR = 0x20;
					break;
					//复位
					default: get_flag = 16 ;
					break;
				}
			}
		} else IO_KeyHoldCnt = 0;
	}
	P0 = 0xff;
}
/********************延时函数******************************/
void Delay1ms()//@11.0592MHz {
	_nop_();
	_nop_();
	_nop_();
	i = 11;
	j = 190;
	do {
		while (--j);
	}
	while (--i);
}
void Delay_ms(u16 xms) {
	for (k=0;k<xms;k++) {
		Delay1ms();
	}
}
/********************** Timer0初始化 ************************/
void Timer0Init(void)//1毫秒 @11.0592MHz {
	AUXR = 0x80;
	//定时器时钟1T模式
	TMOD = 0x00;
	//设置定时器模式
	TL0 = 0xCD;
	//设置定时初值
	TH0 = 0xD4;
	//设置定时初值
	EA = 1;
	//开启总中断
	ET0 = 1;
	//允许定时器0中断
	TF0 = 0;
	//清除TF0标志
	TR0 = 1;
	//定时器0开始计时
}
/********************** Timer0中断函数 ************************/
void timer0 (void) interrupt 1 {
	counter++;
	Fre_counter++;
	DisplayScan();
}
/********************** 频率产生 ************************/
void Fre_output(u16 Fre)//T=Fre(ms);f=1000/Fre {
	LED8[0] = 15;
	//F
	LED8[1] = 29;
	//r
	LED8[2] = 14;
	//E
	LED8[3] = 17;
	//-
	LED8[4] = 17;
	//-
	Fre = 500 / Fre;
	if(Fre_counter >= Fre) {
		P16 = !P16;
		Fre_counter = 0;
	}
}
/********************** 步进加_减 ************************/
//返回1：加
//返回0：减
int up_down(bit up,bit down) {
	if(up == 1)//步进 - 加1 {
		LED8[7] = LED8[7] + 1;
		if(LED8[7] == 10) {
			if(LED8[6] == 9) {
				if(LED8[5] == 9) {
					LED8[7] = 9;
					LED8[6] = 9;
					LED8[5] = 9;
				} else {
					LED8[7] = 0;
					LED8[6] = 0;
					LED8[5] ++;
				}
			} else {
				LED8[7] = 0;
				LED8[6] ++;
			}
		}
		return 1;
	} else if (down == 1)//步进 - 减1 {
		LED8[7] = LED8[7] - 1;
		if(LED8[7] < 0) {
			if(LED8[6] == 0 ) {
				if(LED8[5] == 0) {
					LED8[7] = 0;
					LED8[6] = 0;
					LED8[5] = 0;
				} else {
					LED8[7] = 9;
					LED8[6] = 9;
					LED8[5] --;
				}
			} else {
				LED8[7] = 9;
				LED8[6] --;
			}
		}
		return 0;
	}
}
/********************** 主函数 ************************/
void main(void) {
	GPIO();
	Timer0Init();
	P16 = 1;
	P17 = 1;
	for (k = 0; k < 8; k++) LED8[k] = 17;
	Fre_counter = 0;
	counter = 0;
	while(1) {
		if(counter >= 50) //50ms扫描键盘 {
			IO_KeyScan();
			counter = 0;
		}
		if(next_flag==0) //提示信息:input {
			for (i=0; i<5; i++) LED8[i] = start[i];
		}
		if(next_flag==1) //有按键按下 {
			if(get_flag != 12) //输入目标频率：10~999 {
				LED8[5] = LED8[6];
				//移位
				LED8[6] = LED8[7];
				LED8[7] = get_flag;
				next_flag = 0;
			} else //确认按键 {
				Fre_input = LED8[5] * 100 + LED8[6] * 10 + LED8[7];
				switch(up_down(up,down)) //步进微调 {
					case 0: Fre_input --;
					//减1
					down = 0;
					break;
					case 1: Fre_input ++;
					//加1
					up = 0;
					break;
					default:break;
				}
				Fre_output(Fre_input);
				P17 = !P17;
			}
		}
	}
}