原创 FM收音机初步成功,可以收到台了

2008-10-19 23:11 2527 6 6 分类: MCU/ 嵌入式

今天参考ouravr的几个TEA5767的帖子,修改了他的程序,用在FM板上,可以显示和收到台了。


原帖地址:http://www.ouravr.com/bbs/bbs_content.jsp?bbs_sn=1117837&bbs_page_no=1&search_mode=1&search_text=5767&bbs_id=9999


我的程序还没整理好,我的程序比较大,keil编译后大于2K,2051装不下,我用的4051。等过几天整理好了,我会上传我的程序。


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以下内容为原帖的程序,供大家参考,版权归原帖作者所有。


感谢OURAVR论坛的网友提供的资料。


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#include"AT89X52.H"
#define uchar unsigned char
unsigned int iic_delay_time = 60;
sbit scl="P2"^6;
sbit sda="P2"^7;
sbit INT_0=P3^2;
sbit INT_1=P3^3;
sbit INT_2=P3^4;
sbit have="P0"^0;                    
#define max_freq 108000
#define min_freq 87500
unsigned char radio_write_data[5];        //要写入TEA5767的数据
unsigned char radio_read_data[5];        //TEA5767读出的状态
unsigned int default_pll=0x2d56;//0x2d56;        //默认存台的pll,95.3MHz 江苏交广
unsigned int  pll;
unsigned long frequency;
//unsigned int max_pll=0x339b;            //108MHz时的pll,
//unsigned int min_pll=0x9000;            //70MHz时的pll`



// delay
void iic_delay(unsigned int m)
{
    unsigned int n;
    for(n=0;n<m;n++);
}
//启动I2C总线的函数,当scl为高电平时使sda产生一个负跳变 
void iic_start() 
{
    sda="1";
    scl="1";
    iic_delay(iic_delay_time);
    sda="0";
    iic_delay(iic_delay_time);
    scl="0";
    iic_delay(iic_delay_time/2);
}


//终止I2C总线,当scl为高电平时使sda产生一个正跳变
void iic_stop() 
{                
        sda="0";
    scl="1";
    iic_delay(iic_delay_time);
    sda="1";
    iic_delay(iic_delay_time);
}


//发送应答信号
void iic_ack() 
{
    sda="0";
    scl="1";
    scl="0";
    sda="1";
}



//等待应答信号
bit waitack(void)
{
        unsigned char errtime="255";//因故障接收方无ACK,超时值为25。
        sda="1";
        iic_delay(iic_delay_time);
        while(sda)
        {
                errtime--;
                if (!errtime)
                {
                        iic_stop();         
                        return 0;
                }
        }        
        scl="1";
         iic_delay(iic_delay_time);
        scl="0";
        return 1;
}



//发送一个字节
void iic_write8bit(unsigned char input) 
{
    unsigned char temp;
    for(temp=0;temp<8;temp++) 
    {
        if((input<<temp)&0x80)
            sda="1";
        else
            sda="0";
        scl="1";


        iic_delay(iic_delay_time);
        scl="0";
    }
}
//读一个字节
unsigned char iic_read8bit() 
{
    unsigned char temp,rbyte=0;
    for(temp=0;temp<8;temp++) 
    {
        scl="1";
        iic_delay(iic_delay_time);
        if(sda)
            rbyte=(rbyte<<1)+1;
        else
            rbyte="rbyte"<<1;
        scl="0";
    }
    return(rbyte);
}


/********************************/
//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
}
//写5767
void radio_write(void)
{
    unsigned char i;
    iic_start();
    iic_write8bit(0xc0);        //TEA5767写地址
    waitack();
        for(i=0;i<5;i++)
        {
            iic_write8bit(radio_write_data);
            waitack();


        }
    
    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
    waitack();
    
        for(i=0;i<5;i++)
        {
            radio_read_data=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,+0.1MHz; mode="0:-0".1MHz ,不用考虑TEA5767用于搜台的相关位:SM,SUD
void search()
{
    radio_read();        


        frequency+=100;
        if(frequency>max_freq)
            frequency="min"_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,频率增加搜台
void auto_searchup()
{
    radio_read();
        if(frequency>max_freq)
            frequency="min"_freq;
    get_pll();
    
        radio_write_data[2]=0xa0;
       
    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();
  
}
//自动搜台,频率减小搜台
void auto_searchdown()
{
    radio_read();
        if(frequency<min_freq)
            frequency="max"_freq;
    get_pll();


    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();
 
}


 


 



/**********************************************/
void delay(void)
{
        unsigned char i,j;
        for(i=20;i>0;i++)
        for(j=248;j>0;j--);
}


//向上搜台
void key_process0() 
 {                 
                  delay();
                if(INT_0==0)
                {
                
                        auto_searchup();
                }
                
        
 } 


//向下搜台
void key_process1() 
 {                 
                  delay();
                if(INT_1==0)
                {
                        
                        auto_searchdown();
                }
                
        
 } 
//手动搜台
 key_process2()
 {                 
                  delay();
                if(INT_2==0)
                {
                        
                        search();
                }
                
        
 } 


void main()
{
        unsigned char radio_write_data[5]={0x2d,0x56,0x20,0x11,0x00}; 
    radio_write(); 
        while(1)
        {
        radio_read(); 
        if((radio_read_data[0]&0x80))     //搜台成功标志
            {
                        have="0";        
            } 



        if(INT_0==0)
                {
                        key_process0();
                }
        if(INT_1==0)
                {
                         key_process1();
                }
/*************手动搜台*******************************************************************/
        if(INT_2==0)
        {
                        key_process2();
        }


        }
}


FM模块中文资料:无锡硅动力的SP3767.pdfpdf


 


 

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