CT107D Blue Bridge Cup dynamic digital tube example (4)

Today I will tell you about the display of CT107D Blue Bridge Cup digital tube.

I won't go into detail about the specific principles of digital tubes, because I'm afraid you'll get dizzy if I say too much. If you want to understand the principles, you can do some BD yourself.

Let's find the circuit:

As you can see, we directly control the Y7C port and send data to the P0 port.

We control the Y6C port to select which digital tube to use, one is 8

We just need to find Y6C and Y7C

This is very familiar, okay, let's use the method

P2=（P2&0x1f）|0xc0; Open Y6

P0=0x01; select the first      

P2&=0x1f; Close Y6

P2=（P2&0x1f）|0xe0; Open Y7

P0=0xf9; Give data      

P2&=0x1f; Close Y7

Here is the basic usage. Now I will write a complete program

#include "reg52.h"

unsigned char code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff,0xbf}; //data encoding

unsigned char dsbuff[]={10,10,10,10,10,10,10,10}; Displayed data

unsigned char dscom = 0;

void init_smg()

{

TMOD|= x01; Timer 0 working mode 2

TH0=(65536-2000)/256; interrupt once every 2m seconds

TL0=(65536-2000)%256;

ET0=1; Enable timer interrupt

TR0=1; start timer 0

EA=1; Enable general interrupt

}

void dsPlay()

{ 

P2=(P2&0x1f)|0xe0;

P0=0xff;

P2&=0x1f;

P2=(P2&0x1f)|0xc0;

P0=1<P2&=0x1f

P2=(P2&0x1f)|0xe0;

P0=tab[dsbuff[dscom]];

P2&=0x1f;

if(++dscom==8)dscom=0;

}

void smg_time0()interrupt 1

{

TH0=(65536-2000)/256; interrupt once every 2m seconds

TL0=(65536-2000)%256;

dsplay();

}

void main()

{

init_smg();

dsbuff[0]=8; The first digital tube displays 8

while(1);

}