基于STC89C52RC單片機(jī)+TEA5767的FM收音機(jī)（原理圖+源代碼）

ID:577322 · 發(fā)表于 2021-7-5 08:54

方案是一個(gè)FM收音機(jī)，包含完整的原理圖和源代碼，拿回家馬上就可以動(dòng)手去做。該收音機(jī)基于STC89C52RC（STC89C52RC數(shù)據(jù)手冊(cè)）單片機(jī)和TEA5767芯片設(shè)計(jì)，同時(shí)使用飛利浦的TDA1308音頻功放IC，可以使用耳機(jī)收聽(tīng)，也可以接功放收聽(tīng)，音質(zhì)不錯(cuò)，在實(shí)驗(yàn)室可以接受到十幾個(gè)清晰的電臺(tái)。主板也是一個(gè)很好的51單片機(jī)學(xué)習(xí)板，單片機(jī)的所有IO口已經(jīng)在電路板上引出，方便實(shí)驗(yàn)。

單片機(jī)源程序如下:

#include <reg51.h>
#include <string.h>
#include <math.h>
#include <uart.h>
#include <i2c.h>
#define max_freq 108000
#define min_freq 87500
sbit KEY1=P3^2;
sbit KEY2=P3^3;
unsigned char radio_write_data[5]={0x29,0xc2,0x20,0x11,0x00}; //要寫(xiě)入TEA5767的數(shù)據(jù)
//unsigned char radio_write_data[5]={0x2a,0xb6,0x40,0x11,0x40}; //要寫(xiě)入TEA5767的數(shù)據(jù)
unsigned char radio_read_data[5]; //TEA5767讀出的狀態(tài)
unsigned int default_pll=0x301d; //0x29f9; //默認(rèn)存臺(tái)的pll,95.8MHz
//unsigned int max_pll=0x339b; //108MHz時(shí)的pll,
//unsigned int min_pll=9000; //70MHz時(shí)的pll
unsigned long frequency;
unsigned int pll;
/*void delay(unsigned int time)
{
while(time--);
}*/
void delay1ms (unsigned int b)//1ms
{
for(b;b>0;b--)
{unsigned int i;
for(i=0;i<300;i++)
{;}
}
}
void radio_write(void)
{
unsigned char i;
iic_start();
iic_write8bit(0xc0); //TEA5767寫(xiě)地址
if(!iic_testack())
{
for(i=0;i<5;i++)
{
iic_write8bit(radio_write_data[i]);
iic_ack();
}
}
iic_stop();
}
//由頻率計(jì)算PLL
void get_pll(void)
{
unsigned char hlsi;
// unsigned int twpll=0;
hlsi=radio_write_data[2]&0x10; //HLSI位
if (hlsi)
pll=(unsigned int)((float)((frequency+225)*4)/(float)32.768); //頻率單位:k
else
pll=(unsigned int)((float)((frequency-225)*4)/(float)32.768); //頻率單位:k
}
//由PLL計(jì)算頻率
void get_frequency(void)
{
unsigned char hlsi;
unsigned int npll=0;
npll=pll;
hlsi=radio_write_data[2]&0x10;
if (hlsi)
frequency=(unsigned long)((float)(npll)*(float)8.192-225); //頻率單位:KHz
else
frequency=(unsigned long)((float)(npll)*(float)8.192+225); //頻率單位:KHz
}
//讀TEA5767狀態(tài),并轉(zhuǎn)換成頻率
void radio_read(void)
{
unsigned char i;
unsigned char temp_l,temp_h;
pll=0;
iic_start();
iic_write8bit(0xc1); //TEA5767讀地址
if(!iic_testack())
{
for(i=0;i<5;i++)
{
radio_read_data[i]=iic_read8bit();
iic_ack();
}
}
iic_stop();
temp_l=radio_read_data[1];
temp_h=radio_read_data[0];
temp_h&=0x3f;
pll=temp_h*256+temp_l;
get_frequency();
}
//手動(dòng)設(shè)置頻率,mode=1,+0.1MHz; mode=0:-0.1MHz ,不用考慮TEA5767用于搜臺(tái)的相關(guān)位:SM,SUD
void search(bit mode)
{
radio_read();
if(mode)
{
frequency+=10;
if(frequency>max_freq)
frequency=min_freq;
}
else
{
frequency-=10;
if(frequency<min_freq)
frequency=max_freq;
}
get_pll();
radio_write_data[0]=pll/256;
radio_write_data[1]=pll%256;
radio_write_data[2]=0x20;
radio_write_data[3]=0x11;
radio_write_data[4]=0x00;
radio_write();
}
//自動(dòng)搜臺(tái),mode=1,頻率增加搜臺(tái); mode=0:頻率減小搜臺(tái),不過(guò)這個(gè)好像不能循環(huán)搜臺(tái)
/*void auto_search(bit mode)
{
radio_read();
get_pll();
if(mode)
radio_write_data[2]=0xa0;
else
radio_write_data[2]=0x20;
radio_write_data[0]=pll/256+0x40;
radio_write_data[1]=pll%256;
radio_write_data[3]=0x11;
radio_write_data[4]=0x00;
radio_write();
radio_read();
while(!(radio_read_data[0]&0x80)) //搜臺(tái)成功標(biāo)志
{
delay(1000);
radio_read();
//disp_freq(9,1);
PutNum(frequency);
}
} */
void main()
{
UART_Init();//串口初始化
UART_Send_Str("調(diào)頻收音機(jī)\n");
radio_write();
while(1)
{
if(KEY1==0)
{
delay1ms(15); //延時(shí)15ms
if(KEY1==0)
while(KEY1==0);//等待按鍵釋放
search(1);
radio_read();
UART_Send_Str("目前頻率\n");
UART_Put_Num(frequency);
UART_Send_Str("\n");
}
if(KEY2==0)
{
delay1ms(15); //延時(shí)15ms
if(KEY2==0)
while(KEY2==0);//等待按鍵釋放
search(0);
radio_read();
UART_Send_Str("目前頻率\n");
UART_Put_Num(frequency);
UART_Send_Str("\n");
}
}
}