Microcontroller C language programming: 10s stopwatch-EEWORLD

Collect

#include

#define uchar unsigned char

#define uint unsigned int

sbit K1=P3^7;

fly

i,Second_Counts,Key_Flag_Idx;

bit Key_State;

fly

DSY_CODE[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

//Delay

void DelayMS(uint ms)

{

flying t;

while(ms--) for(t=0;t<120;t );

}

//Handle key events

void Key_Event_Handle()

{

if(Key_State==0)

{

Key_Flag_Idx=(Key_Flag_Idx 1)%3;

switch(Key_Flag_Idx)

{

case 1:EA=1;ET0=1;TR0=1;break;

case 2:EA=0;ET0=0;TR0=0;break;

case 0:P0=0x3f;P2=0x3f;i=0;Second_Counts=0;

}

//Main program

void main()

{

P0=0x3f; //display 00

P2=0x3f;

i=0;

Second_Counts=0;

Key_Flag_Idx=0; //Number of key presses (values 0, 1, 2, 3)

Key_State=1; //Key status

TMOD=0x01; //Timer 0 mode 1

TH0=(65536-50000)/256; //Timer 0: 15ms

TL0=(65536-50000)%6;

while(1)

{

if(Key_State!=K1)

{

DelayMS(10);

Key_State=K1;

Key_Event_Handle();

}

/T0 interrupt function

void DSY_Refresh() interrupt 1

{

TH0=(65536-50000)/256; //Restore the initial value of timer 0

TL0=(65536-50000)%6;

if( i==2)

{

i=0;

Second_Counts; //50ms*2=0.1s conversion state

P0=DSY_CODE[Second_Counts/10];

P2=DSY_CODE[Second_Counts];

if(Second_Counts==100) Second_Counts=0; //Display 00 after reaching 100 (10s)

}

Microcontroller C language programming: 10s stopwatch

Keywords：MCU Reference address：Microcontroller C language programming: 10s stopwatch

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