51 Experiment 11: The 16 keys of the matrix keyboard represent 0-9, af-EEWORLD

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51 Experiment 11: The 16 keys of the matrix keyboard represent 0-9, a-f respectively, and the last digit is displayed by the digital tube

#include

typedef unsigned int u16;

typedef unsigned char u8;

#define GPIO_DIG P0

#define GPIO_KEY P1

//Digital Tube

sbit LSA=P2^2;

sbit LSB=P2^3;

sbit LSC=P2^4;

//Digital watch

u8 code smgduan[16]={0x3f,0x06,0x5b,0x4f,0x66,

0x6d,0x7d,0x07,0x7f,0x6f,

0x77,0x7c,0x39,0x5e,0x79,

0x71};

//Store button number

u8 KeyValue;

//Delay function

void delay(u16 i)

{

while(i--);

}

//Get the button number

void KeyDown()

{

char a=0;

GPIO_KEY=0x0f;

if(GPIO_KEY!=0x0f)

{

// Determine the column

switch(GPIO_KEY)

{

case(0x07):KeyValue=0;break;

case(0x0b):KeyValue=1;break;

case(0x0d):KeyValue=2;break;

case(0x0e):KeyValue=3;break;

}

GPIO_KEY=0xf0;

//Confirm the row

switch(GPIO_KEY)

{

case(0x70):KeyValue=KeyValue;break;

case(0xb0):KeyValue=KeyValue+4;break;

case(0xd0):KeyValue=KeyValue+8;break;

case(0xe0):KeyValue=KeyValue+12;break;

}

while((a<50)&&(GPIO_KEY!=0xf0))

{

delay(1000);

a++;

}

void main()

{

while(1)

{

//Get the button number

KeyDown();

//Determine the position of the digital tube

LSA=0;LSB=0;LSC=0;

//keyvalue determines the number

GPIO_DIG=smgduan[KeyValue];

}

Reference address：51 Experiment 11: The 16 keys of the matrix keyboard represent 0-9, af

Previous article：51 Experiment 12: Digital tube display 12345678
Next article：51 Experiment 10: Independent button controls a digital tube to display 0-9, and only adds 1 when pressed once.

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