收音机模块TEA5767的C51控制程序

TEA5767采用I2C或者三线接口控制,我是用的I2C,单片机用STC89C52,带1K EEPROM,可以掉电存台,1602LCD显示.

TEA5767读写数据都是5个字节,其中PLL参数14位,具体数据格式请看datasheet.以下程序中的函数可以直接在主程序中调用.

#include iic.c

#define max_freq 108000

#define min_freq 87500

unsigned char radio_write_data[5]={0x29,0xc2,0x20,0x11,0x00}; //要写入TEA5767的数据

unsigned char radio_read_data[5]; //TEA5767读出的状态

unsigned int default_pll=0x29c2;//0x29f9; //默认存台的pll,87.8MHz

//unsigned int max_pll=0x339b; //108MHz时的pll,

//unsigned int min_pll=9000; //70MHz时的pll

void radio_write(void)

{

unsigned char i;

iic_start();

iic_write8bit(0xc0); //TEA5767写地址

if(!iic_testack())

{

for(i=0;i5;i++)

{

iic_write8bit(radio_write_data[i]);

iic_ack();

}

}

iic_stop();

}

//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;i5;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();

}

//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

}

//手动设置频率,mode=1,+0.1MHz; mode=0:-0.1MHz ,不用考虑TEA5767用于搜台的相关位:SM,SUD

void search(bit mode)

{

radio_read();

if(mode)

{

frequency+=100;

if(frequency>max_freq)

frequency=min_freq;

}

else

{

frequency-=100;

if(frequency

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();

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)) //搜台成功标志

{

radio_read();

disp_freq(9,1);

}

}