单片机fm收音机模块TEA5767模块电路图与程序 -

#include <reg52.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "uart.h"
#include "I2C.h"
sbit s1=P3^4; //手动减小键
sbit s2=P3^5; //手动增加键
sbit s3=P3^6; //自动减小键
sbit s4=P3^7; //自动增加键
#define max_freq 108000
#define min_freq 87500
unsigned int max_pll=0x339b; //108MHz时的pll,
unsigned int min_pll=0x299d; //87.5MHz时的pll.
unsigned char radio_write_data[5]={0x2a,0xb6,0x40,0x11,0x40}; //要写入TEA5767的数据
unsigned char radio_read_data[5]; //TEA5767读出的状态
unsigned long frequency;
unsigned int pll;
void delay_ms(unsigned int i) //us延时函数
{
unsigned int j,k;
for(j=i;j>0;j--)
for(k=125;k>0;k--);
}
void radio_write(void)
{
unsigned char i;
iic_start();
iic_write8bit(0xc0); //TEA5767写地址
if(!iic_testack())
{
for(i=0;i<5;i++)
{
iic_write8bit(radio_write_data[i]);
iic_ack();
}
}
iic_stop();
}
//由频率计算PLL
void get_pll(void)
{
unsigned char hlsi;
unsigned int twpll=0;
hlsi=radio_write_data[2]&0x10;
if (hlsi)
pll=(unsigned int)((float)((frequency+225)*4)/(float)32.768); //频率单位:k
else
pll=(unsigned int)((float)((frequency-225)*4)/(float)32.768); //频率单位:k
}
//由PLL计算频率
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); //频率单位:KHz
else
frequency=(unsigned long)((float)(npll)*(float)8.192+225); //频率单位:KHz
}
//读TEA5767状态,并转换成频率
void radio_read(void)
{
unsigned char i;
unsigned char temp_l,temp_h;
pll=0;
iic_start();
iic_write8bit(0xc1); //TEA5767读地址
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();
}
//手动设置频率,mode=1,+0.01MHz; mode=0:-0.01MHz ,不用考虑TEA5767用于搜台的相关位: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]=0x41;
radio_write_data[3]=0x11;
radio_write_data[4]=0x40;
radio_write();
}
//自动搜台,mode=1,频率增加搜台; mode=0:频率减小搜台,不过这个好像不能循环搜台
void auto_search(bit mode)
{
radio_read();
if(mode)
{
radio_write_data[2]=0xb1;
frequency+=20;
if(frequency>max_freq)
frequency=min_freq;
}
else
{
radio_write_data[2]=0x41;
frequency-=20;
if(frequency<min_freq)
frequency=max_freq;
}
get_pll();
radio_write_data[0]=pll/256+0x40; //加0x40是将SM置为1 为自动搜索模式
radio_write_data[1]=pll%256;
radio_write_data[3]=0x11; //SSL1和SSL0控制搜索停止条件
radio_write_data[4]=0x40;
radio_write();
radio_read();
while(!(radio_read_data[0]&0x80)) //搜台成功标志
{
radio_read();
}
}
void main()
{
P3=0xff;
UART_Init();
comm("http://shop35585928.taobao.com \r\n\0");
comm("TEA5767 FM \r\n\0");
radio_write();
while(1)
{
if(s1==0)
{delay_ms(1);
if(s1==0)
{
while(s1==0);
search(0); send_fre(frequency);
}
}
if(s2==0)
{delay_ms(1);
if(s2==0)
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