stm_units/app/TEA5767_main.c

#include "TEA5767_main.h"

#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_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 int default_pll = 0x301d;       //0x29f9;        //默认存台的pll,95.8MHz
//unsigned int max_pll=0x339b;           //108MHz时的pll,
//unsigned int min_pll=9000;             //70MHz时的pll
unsigned long frequency;
unsigned int pll;

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; //HLSI位

    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,+0.1MHz; mode=0:-0.1MHz ,不用考虑TEA5767用于搜台的相关位:SM,SUD
void search ( bool 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
    {
	    delay(1000);
        radio_read();
        //disp_freq(9,1);
		PutNum(frequency);
    }
} */

#if 0
void TEA5767_main ( void )
{
//UART_Init();//串口初始化
//UART_Send_Str("调频收音机\n");
//radio_write();
//while(1)
    {
        if ( K11.Res == SHORT_KEY_FLAG )
        {
            K11.Res = NO_KEY_FLAG;
            search ( 1 );
            radio_read();

            sprintf ( n5110_string[4], "FM:%.1fMHz  ", frequency * 1.0 / 1000 );
        }

        if ( K12.Res == SHORT_KEY_FLAG )
        {
            K12.Res = NO_KEY_FLAG;
            search ( 0 );
            radio_read();

            sprintf ( n5110_string[4], "FM:%.1fMHz  ", frequency * 1.0 / 1000 );
        }
    }
}
#endif