I made a TEA5767 digital FM stereo radio using a perfboard

//This program uses digital tube to display frequency, crystal oscillator is 12M, has passed the test, has been made into finished product with universal board,
//There are photos made with universal board in my QQ space, high-definition photos can be viewed in QQ album, my space is not encrypted.
//In order to facilitate electronic enthusiasts to make their own, this program has macro definitions for all ports, which is convenient for beginners to modify by themselves, and adds a lot of comments
//Written by Mr. Chen Yongfei on February 19, 2011, QQ: 49204743, email: baiyni888@163.com .
//Address: Caochangmen Branch of Suning Appliance After-sales Service Center, No. 180 Huju Road, Gulou District, Nanjing City, Jiangsu Province
//The frequency adjustment of this radio is calculated by calculation. The displayed frequency is calculated and written into the TEA5767 chip to realize the adjustment
//Use MCS-51 single-chip microcomputer for control, two buttons to realize self-increase or self-decrease frequency, and add continuous addition and subtraction function!
//I used a simplified version of the TEA5767 module bought on Taobao for 4.5 yuan per piece. I received ten radio stations in Nanjing.

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

///
...
​
​
​led3=P2^6; //Frequency display digital tube bit selection port 1M, P2.6 port /////port
sbit led4=P2^7; //Frequency display digital tube bit selection port 0.1M, P2.7 port /////,        
sbit SDA=P3^0; //Connected to the data port of TEA5767 /////can
sbit SCL=P3^1; //Connected to the clock port of TEA5767 /////with 
sbit KEY1=P1^0; //Frequency increase button port /////self
sbit KEY2=P1^1; //Frequency decrease button port /////line
#define duan P0 //Frequency display digital tube segment selection P0 port /////
Revise

//unsigned char radio_write_data[5]={0x33,0x8e,0x70,0x16,0x80}; //Data to be written into TEA5767, 107.9M Jiangsu Tourism Station
//unsigned char radio_write_data[5]={0x32,0x8e,0x70,0x16,0x80}; //Data to be written into TEA5767, 105.8M Nanjing Music Station
//unsigned char radio_write_data[5]={0x31,0xd7,0x70,0x16,0x80}; //Data to be written into TEA5767, 104.3M Nanjing Sports Station
//unsigned char radio_write_data[5]={0x30,0x9a,0x70,0x16,0x80}; //Data to be written into TEA5767, 101.7M Nanjing Economic Station City FM
unsigned char radio_write_data[5]={0x30,0x50,0x70,0x16,0x80}; //Data to be written into TEA5767, 101.1M Jiangsu Traffic Radio Network
//unsigned char radio_write_data[5]={0x2f,0xa5,0x70,0x16,0x80}; //Data to be written into TEA5767, 99.7M Jiangsu Golden Color FM
//unsigned char radio_write_data[5]={0x2c,0xc9,0x70,0x16,0x80}; //Data to be written into TEA5767, 97.5M Jiangsu Literature and Art Station
//unsigned char radio_write_data[5]={0x2c,0xc9,0x70,0x16,0x80}; //Data to be written into TEA5767, 93.7M Jiangsu Economic Station Home Broadcast
//unsigned char radio_write_data[5]={0x2b,0xb0,0x70,0x16,0x80}; //Data to be written into TEA5767, 91.4M Jiangsu Broadcast
//unsigned char radio_write_data[5]={0x2a,0xe1,0x70,0x16,0x80}; //Data to be written into TEA5767, 89.7M Jiangsu Music Station

unsigned long frequency=101100; //The radio frequency initialized at power on is 101.1MHz
unsigned int pll; //Variable used to calculate frequency synthesis

void Delayus(unsigned char x)
{
 for(;x>0;x--);
}

void iic_start()
{
 SDA=1;
 Delayus(4);
 SCL=1;
 Delayus(4);
 SDA=0;
 Delayus(4);
 SCL=0;
 Delayus(4);
}

void iic_stop()
{
 SCL=0;
 Delayus(4);
 SDA=0;
 Delayus(4);
 SCL=1;
 Delayus(4);
 SDA=1;
 Delayus(4);
}

void iic_ack()
{
 SDA=0;
 Delayus(4);
 SCL=1;
 Delayus(4);
 SCL=0;
 Delayus(4);
 SDA=1;
 Delayus(4);
}

bit iic_testack()
{
 bit ErrorBit;
 SDA=1;
 Delayus(4);
 SCL=1;
 Delayus(4);
 ErrorBit=SDA;
 Delayus(4);
 SCL=0;
 return ErrorBit;
}

void iic_write8bit(unsigned char input)
{
 unsigned char temp;
 for(temp=8;temp>0;temp--)
 {
  SDA=(bit)(input&0x80);
  Delayus(4);
  SCL=1;
  Delayus(4);
  SCL=0;
  Delayus(4);
  input=input<<1;
 }
}

[page]
void delays (unsigned char b) //Delay program for key debounce
{
  unsigned char i;
  for(b;b>0;b--)
  for(i=0;i<250;i++);
}

void radio_write(void)
{
    unsigned char i;
    iic_start();
    iic_write8bit(0xc0); //TEA5767 write address
    if(!iic_testack())
    {
        for(i=0;i<5;i++)
        {
            iic_write8bit(radio_write_data[i ]);
            iic_ack();
        }
    }
    iic_stop();   
}

 //Calculate the displayed frequency and write it to the TEA5767 chip for adjustment. Don't consider the related bits used by TEA5767 for searching channels: SM, SUD
void search()
{       
    pll=(unsigned int)((float)((frequency+225))/(float)8.192); //Calculate the synthesized frequency data, frequency unit: k
    radio_write_data[0]=pll/256; //Write the calculated high-order frequency data into TEA5767
    radio_write_data[1]=pll%256; //Write the calculated low-order frequency data into TEA5767
    radio_write_data[2]=0x70; //This is TEA5767 stereo on, mute off
    radio_write_data[3]=0x16; //Chinese standard, using 32768 crystal oscillator, soft mute off, stereo noise cancellation on
    radio_write_data[4]=0x80; //6.5M phase-locked loop on, de-emphasis time 75US
    radio_write();
}

void delay()
{
 uchar k;
 for(k=0;k<100;k++);
}

void desplay(uint aa)
{
 duan=tab[aa/1000]|0x80; //Turn off the decimal point of this digital tube
 led1=0;
 delay();
 led1=1;

 duan=tab[aa%1000/100]|0x80; //Turn off the decimal point of this digital tube
 led2=0;
 delay();
 led2=1;

 duan=tab[aa%100/10]&0x7f; //light up the decimal point of this digital tube
 led3=0;
 delay();
 led3=1;

 duan=tab[aa%10]|0x80; //Turn off the decimal point of this digital tube
 led4=0;
 delay();
 led4=1;
}

void main()
{
 radio_write(); //Write to initialize the radio frequency
 while(1)
 {
   if(!KEY1) //Manually set the frequency, +0.1MHz;
   {
     delays(250); //Delay debounce
     frequency+=100;
          if(frequency>108500) //If the frequency is greater than 108.5MHz
          frequency=87500; //Set the frequency to 87.5MHz
   search();
 desplay(frequency/100); //Call display
   }

    if(!KEY2) //manually set frequency, -0.1MHz;
    {
       delays(250); //delay debounce
       frequency-=100;
        if(frequency<87500) //if the frequency is less than 87.5MHz
        frequency=108500; //set the frequency to 108.5MHz
 search();
 desplay(frequency/100); //call display
    }
 desplay(frequency/100); //call display
 }
}