频率产生器,可以粗调+微调
0Hz -- 999Hz
粗调:直接输入数字,并按确认
微调:加减1步进调整
设置LED显示频率效果
可以多次输入,并设置了复位键
单片机源程序如下:
- #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;
- ……………………
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