51单片机驱动TEA5767调频收音机芯片C程序

/********************** 由PLL获取频率**************************/
void TEA5767_Get_Frequency(void)
{
uchar HLSI;
uint NPLL=0;
NPLL=PLL;
HLSI=TEA5767_Write_Data[2]&0x10;
if (HLSI)
Frequency=(unsigned long)((float)(NPLL)*(float)8.192-225); //频率单位:KHz
else
Frequency=(unsignedlong)((float)(NPLL)*(float)8.192+225); //频率单位:KHz
}
/**********************显示当前频率**************************/
void TEA5767_Display_Frequency()
{
TEA5767_Get_Frequency(); //由PLL得到频率
Display_FM[0]=(Frequency/100000);
if(Display_FM[0]==0)
Display_FM[0]=0x20; //第一位为0的话，不显示
else
Display_FM[0]|=0x30;
Frequency=Frequency%100000;
Display_FM[1]=0x30|(Frequency/10000);
Frequency=Frequency%10000;
Display_FM[2]=0x30|(Frequency/1000);
Frequency=Frequency%1000;
Display_FM[4]=0x30|(Frequency/100);
}
/**********************初始化TEA5767**************************/
void TEA5767_Init()
{
TEA5767_Write(); //写入初始化参数
//EEPROM_Save_PLL(1,0x29de); //预置第1频道
//EEPROM_Save_PLL(2,0x2bb0); //预置第2频道
//EEPROM_Save_PLL(3,0x2cc9); //预置第3频道
//EEPROM_Save_PLL(4,0x2fa5); //预置第4频道
//EEPROM_Save_PLL(5,0x3050); //预置第5频道
//EEPROM_Save_PLL(6,0x309a); //预置第6频道
//EEPROM_Save_PLL(7,0x328e); //预置第7频道
//EEPROM_Save_PLL(8,0x2fa5); //预置第8频道
//EEPROM_Save_PLL(9,0x2fa5); //预置第9频道
//EEPROM_Save_PLL(10,0x2fa5); //预置第10频道
//EEPROM_Save_PLL(11,0x2fa5); //预置第11频道
//EEPROM_Save_PLL(12,0x2fa5); //预置第12频道
//EEPROM_Save_PLL(13,0x2fa5); //预置第13频道
//EEPROM_Save_PLL(14,0x2fa5); //预置第14频道
//EEPROM_Save_PLL(15,0x2fa5); //预置第15频道 注：第一次编译使用预置频道
}
/**********************手动搜索**************************/
void TEA5767_User_Search(uchar Mode)
{
switch(Mode) //向上搜索
{
case 1:
PLL+=1;
if(PLL>0x3370) //108MHz时的PLL,
PLL=0x298d; //87.5MHz时的PLL,
break;
case 0: //向下搜索
PLL-=1; //改变该值可提高精度，但步进变得缓慢
if(PLL<0x298d)
PLL=0x3270;
break;
}
TEA5767_Write_Data[0]=(PLL/256)&0x7f;
TEA5767_Write_Data[1]=PLL%256;
TEA5767_Write(); //重新写入参数
}
/**********************更新PLL**************************/
void TEA5767_Update_PLL(void)
{
TEA5767_Write_Data[0]=(PLL/256)&0x7f;
TEA5767_Write_Data[1]=PLL%256;
TEA5767_Write(); //重新写入参数
}

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