Summary of C51 digital tube display related issues

1. Static display of a single digital tube

/*--------------------------

Function: Static display of a digital tube

Author: Zhang Kaizhou

Date: 2019-5-16 21:18:17

--------------------------*/

#include

sbit duan_address = P2^6; // Define segment address as a bit addressable variable

sbit wei_address = P2^7; // Define the bit address as a bit addressing type variable

void main()

{

wei_address = 1; // Open the bit latch

P0 = 0xfe; // Output the position of the digital tube

wei_address = 0; // Turn off the bit latch

duan_address = 1; // Open the segment latch

P0 = 0x7d; // Output the segment code of the common cathode digital tube (6)

duan_address = 0; // Close the segment latch

while(1);

}

2. Dynamic cycle display of digital tube

/*-----------------------------------

Function: Cycle display of 16 characters from 0 to F on the digital tube

Author: Zhang Kaizhou

Date: 2019-5-16 21:41:50

-----------------------------------*/

#include

#define uchar unsigned char

#define uint unsigned int

sbit wei_address = P2^7; // Define a bit-addressable variable wei_address

sbit duan_address = P2^6; // define bit-addressable variable daun_address

uchar num; // define unsigned character variable num

uchar code table[] = {0x3f, 0x06, 0x5b, 0x4f,

  0x66, 0x6d, 0x7d, 0x07,

  0x7f, 0x6f, 0x77, 0x7c,

  0x39, 0x5e, 0x79, 0x71}; // Define an unsigned character array table[] to store the segment code of the common cathode digital tube (0~F characters), which is stored in the ROM or Flash inside the microcontroller

void delay(uint xms);

void main()

{

wei_address = 1; // open latch

P0 = 0x00; // Select the digital tube to be displayed

wei_address = 0; // Close the latch

while(1)

{

for(num = 0; num < 16; num++) // Cycle through the digital tube to display characters 0 to F

{

duan_address = 1; // Open the segment latch of the digital tube

P0 = table[num]; // Output segment code

duan_address = 0; // Close segment latch

delay(1000); // Delay 1000ms = 1s

}

}

}

void delay(uint xms)

{

uint i, j;

for(i = xms; i > 0; i--)

for(j = 110; j > 0; j--);

}

3. Dynamic scanning display of multiple digital tubes

/*-----------------------------------

Function: Dynamically display character information on 4 digital tubes

Author: Zhang Kaizhou

Date: 2019-5-16 21:41:50

-----------------------------------*/

#include

#define uchar unsigned char

#define uint unsigned int

sbit wei_address = P2^7; // Define a bit-addressable variable wei_address

sbit duan_address = P2^6; // define bit-addressable variable daun_address

uchar num; // define unsigned character variable num

uchar code table[] = {0x3f, 0x06, 0x5b, 0x4f,

  0x66, 0x6d, 0x7d, 0x07,

  0x7f, 0x6f, 0x77, 0x7c,

  0x39, 0x5e, 0x79, 0x71}; // Define an unsigned character array table[] and store it in the ROM or Flash inside the microcontroller

void delay(uint xms);

void main()

{

while(1)

{

// Display 0

duan_address = 1;

P0 = table[0];

duan_address = 0;

wei_address = 1;

P0 = 0xfe;

wei_address = 0;

delay(5);

// Display 1

duan_address = 1;

P0 = table[1];

duan_address = 0;

P0 = 0xff; // erase

wei_address = 1;

P0 = 0xfd;

wei_address = 0;

delay(5);

// Display 2

duan_address = 1;

P0 = table[2];

duan_address = 0;

P0 = 0xff; // erase

wei_address = 1;

P0 = 0xfb;

wei_address = 0;

delay(5);

// Display 3

duan_address = 1;

P0 = table[3];

duan_address = 0;

P0 = 0xff; // erase

wei_address = 1;

P0 = 0xf7;

wei_address = 0;

delay(5);

}

}

void delay(uint xms)

{

uint i, j;

for(i = xms; i > 0; i--)

for(j = 110; j > 0; j--);

}