单片机_车速报警器

#ifndef _Max7219_H_ #define _Max7219_H_

#include #include #define uchar unsigned char #define uint unsigned int

#define DECODE_MODE 0x09 #define INTENSITY 0x0A #define SCAN_LIMIT 0x0B #define SHUT_DOWN 0x0C #define DISPLAY_TEST 0x0D

#define delay1us _nop_(); #define delay2us

{delay1us;delay1us;}

//译码方式

#define delay4us {delay2us;delay2us;} #define delay5us {delay4us;delay1us;} #define delay12us {delay4us;delay4us;delay4us;}

sbit din=P2^0; sbit load=P2^1; sbit clk=P2^2;

void Max7219_Wr_byte(uchar wrdat); void Max7219_Wr_data(uchar addr,uchar dat); void Init_Max7219(void);

void Disp_speed(uint speed); void Disp_set_speed(uint set_speed);

//初始化MAX7219 void Max7219_Init(void) { }

void Max7219_Wr_byte(uchar wrdat) {

bit dat; uchar i;

for (i=0;i<8;i++) {

clk=0;

dat=(bit)(wrdat&0x80); if(dat) else

din=0; din=1;

Max7219_Wr_data(SHUT_DOWN, 0x01); Max7219_Wr_data(DISPLAY_TEST, 0x00); Max7219_Wr_data(DECODE_MODE, 0xff); Max7219_Wr_data(SCAN_LIMIT, 0x07); Max7219_Wr_data(INTENSITY, 0x0a);

wrdat<<=1; clk=1;

} }

void Max7219_Wr_data(uchar addr,uchar dat)

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{ }

void Disp_speed(uint speed) { }

void Disp_set_speed(uint set_speed) {

uchar speed_buf[4]; uchar i;

uchar speed_buf[4]; uchar i;

speed_buf[0]=speed%10; speed_buf[1]=speed/10%10|0x80; speed_buf[2]=speed/100%10; speed_buf[3]=speed/1000; if(0==speed_buf[3]) { }

for(i=1;i<=4;i++)

{ }

Max7219_Wr_data(i,speed_buf[i-1]); speed_buf[3]=0x0f; if(0==speed_buf[2]) speed_buf[2]=0x0f; load=0;

Max7219_Wr_byte(addr); Max7219_Wr_byte(dat); load=1;

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}

speed_buf[0]=set_speed%10; speed_buf[1]=set_speed/10%10|0x80; speed_buf[2]=set_speed/100%10; speed_buf[3]=set_speed/1000; if(0==speed_buf[3]) { }

for(i=1;i<=4;i++)

{ }

Max7219_Wr_data(i+4,speed_buf[i-1]); speed_buf[3]=0x0f; if(0==speed_buf[2]) speed_buf[2]=0x0f;

#endif

#include

sbit KEY0=P2^3; sbit KEY1=P2^4; sbit KEY2=P2^5; sbit KEY3=P2^6;

sbit SPK=P2^7; sbit LED_GREEN=P1^6; sbit LED=P1^7;

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uint set_speed; uint speed; uchar sec_cnt;

void Init_8051(void); void Delay(uchar time); uint Get_key(void); void Warn_ring(void);

void main(void) { Init_8051(); Max7219_Init(); while(1) { set_speed=Get_key(); Disp_speed(speed); Disp_set_speed(set_speed); Warn_ring();

}

}

void Delay(uchar time) { uchar t1,t2;

for(t1=time;t1>0;t1--)

for(t2=248;t2>0;t2--); } //初始化

void Init_8051(void)

5

{ EA=0; TCON=0x00; TMOD=0x51; TL0=0xe0; TH0=0xb1;

//定时20ms //T1计数13个脉冲

TL1=0xf3; TH1=0xff; TR0=1; TR1=1; IE=0x8a; SPK=0; LED=0; LED_GREEN=1;

}

//定时器0函数，定时50*20ms=1s void Timer0_speed(void) interrupt 1 { ET0=0; TR0=0; TL0=0xe0; TH0=0xb1; TR0=1; sec_cnt++; ET0=1; }

//计数中断 计数10次 半径d=20cm //speed=0.2*60*10/sec_cnt*36 km/h

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void Counter_speed(void) interrupt 3 { float a=6250; }

//键盘处理函数 uint Get_key(void) {

static

uint key_value;

ET1=0; TR1=0; TL1=0xf3; TH1=0xff; TR1=1;

speed=4.52*a/sec_cnt; sec_cnt=0; ET1=1;

if(!KEY0) {

Delay(40); if(!KEY0) {

while(KEY3) {

if(!KEY1) {

Delay(40); if(0==KEY1) {

while(0==KEY1) {

Disp_set_speed(key_value);

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}

}

}

}

}

}

}

key_value+=10; if(key_value==9999)

key_value=0;

if(!KEY2) { }

Delay(40); if(0==KEY2) { }

while(0==KEY2) { }

key_value-=10;

if(key_value==0)

key_value=9999; Disp_set_speed(key_value);

return (key_value);

//报警函数

void Warn_ring(void) {

if(speed > set_speed) {

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LED=1; SPK=0; Delay(1); SPK=1;

} else

LED=0;

}

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