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#include <reg51.h>
#include <string.h>
#include <math.h>
#define uchar unsigned char
#define uint unsigned int
#define max_freq 108000 //手動(dòng)搜索最高頻率
#define min_freq 87500 //手動(dòng)搜索最低頻率
uint tt=0; //手動(dòng)選預(yù)設(shè)臺(tái)標(biāo)記
sbit SDA=P0^0; //接在TEA5767的數(shù)據(jù)端口
sbit SCL=P0^1; //接在TEA5767的時(shí)鐘端口
sbit KEY1=P3^5; //頻率增加按鍵端口
sbit KEY2=P3^4; //頻率減小按鍵端口
sbit KEY3=P3^3; //預(yù)設(shè)電臺(tái)增加
sbit KEY4=P3^2; //預(yù)設(shè)電臺(tái)減少
unsigned char radio_write_data[5]={0x2a,0x30,0xC0,0x17,0x00}; //要寫入TEA5767的數(shù)據(jù),88.7M，開(kāi)機(jī)預(yù)設(shè)
//前兩位是頻率，后三位不需要修改
unsigned int pll;
unsigned long frequency=87500;
void delay1ms (unsigned int b)//1ms延時(shí)
{
for(b;b>0;b--)
{unsigned int i;
for(i=0;i<300;i++)
{;}
}
}
void Delayus(unsigned char x)
{
for(;x>0;x--);
}
void iic_start()
{
SDA=1;
Delayus(5);
SCL=1;
Delayus(5);
SDA=0;
Delayus(5);
SCL=0;
Delayus(5);
}
void iic_stop()
{
SCL=0;
Delayus(5);
SDA=0;
Delayus(5);
SCL=1;
Delayus(5);
SDA=1;
Delayus(5);
}
void iic_ack()
{
SDA=0;
Delayus(5);
SCL=1;
Delayus(5);
SCL=0;
Delayus(5);
SDA=1;
Delayus(5);
}
bit iic_testack()
{
bit ErrorBit;
SDA=1;
Delayus(5);
SCL=1;
Delayus(5);
ErrorBit=SDA;
Delayus(5);
SCL=0;
return ErrorBit;
}
void iic_write8bit(unsigned char input)
{
unsigned char temp;
for(temp=8;temp>0;temp--)
{
SDA=(bit)(input&0x80);
Delayus(5);
SCL=1;
Delayus(5);
SCL=0;
Delayus(5);
input=input<<1;
}
}
//由頻率計(jì)算PLL
void get_pll(void)
{
unsigned char hlsi;
hlsi=radio_write_data[2]&0x10; //HLSI位
if (hlsi)
pll=(unsigned int)((float)((frequency+225)*4)/(float)32.768); //頻率單位:k
else
pll=(unsigned int)((float)((frequency-225)*4)/(float)32.768); //頻率單位:k
}
/*//由PLL計(jì)算頻率
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); //頻率單位:KHz
else
frequency=(unsigned long)((float)(npll)*(float)8.192+225); //頻率單位:KHz
}
*/
void radio_write(void)
{
unsigned char i;
iic_start();
iic_write8bit(0xc0); //TEA5767寫地址
if(!iic_testack())
{
for(i=0;i<5;i++)
{
iic_write8bit(radio_write_data[i]);
iic_ack();
}
}
iic_stop();
}
//將顯示的頻率算好后寫到TEA5767芯片里面實(shí)現(xiàn)調(diào)節(jié),不用考慮TEA5767用于搜臺(tái)的相關(guān)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]=0xC0;
radio_write_data[3]=0x17;
radio_write_data[4]=0x00;
radio_write();
}
void main()
{
delay1ms(150);
radio_write();
while(1)
{
if(KEY1==0)
{
delay1ms(15); //延時(shí)15ms
if(KEY1==0)
while(KEY1==0);//等待按鍵釋放
search(1);
}
if(KEY2==0)
{
delay1ms(15); //延時(shí)15ms
if(KEY2==0)
while(KEY2==0);//等待按鍵釋放
search(0);
}
if(KEY3==0)
{
delay1ms(15); //延時(shí)15ms
if(KEY3==0)
while(KEY3==0);//等待按鍵釋放
if (tt==11)//手動(dòng)選臺(tái)判斷，保證能循環(huán)選擇，不嚴(yán)禁能工作，請(qǐng)忽略
tt=-1;
tt++;
switch(tt) //手動(dòng)選臺(tái)
{
case 0:
{
radio_write_data[0]=0x2A;//寫入的頻率
radio_write_data[1]=0x30;
break;
}
case 1:
{
radio_write_data[0]=0x2B;
radio_write_data[1]=0x3C;
break;
}
case 2:
{
radio_write_data[0]=0x2B;
radio_write_data[1]=0xB6;
break;
}
case 3:
{
radio_write_data[0]=0x2C;
radio_write_data[1]=0x86;
break;
}
case 4:
{
radio_write_data[0]=0x2D;
radio_write_data[1]=0x6E;
break;
}
case 5:
{
radio_write_data[0]=0x2E;
radio_write_data[1]=0xB7;
break;
}
case 6:
{
radio_write_data[0]=0x30;
radio_write_data[1]=0xD0;
break;
}
case 7:
{
radio_write_data[0]=0x31;
radio_write_data[1]=0x0D;
break;
}
case 8:
{
radio_write_data[0]=0x31;
radio_write_data[1]=0xA0;
break;
}
case 9:
{
radio_write_data[0]=0x32;
radio_write_data[1]=0xB9;
break;
}
case 10:
{
radio_write_data[0]=0x33;
radio_write_data[1]=0x02;
break;
}
case 11:
{
radio_write_data[0]=0x33;
radio_write_data[1]=0x4B;
break;
}
}
radio_write_data[2]=0xC0;//寫入的其他參數(shù)
radio_write_data[3]=0x17;
radio_write_data[4]=0x00;
radio_write();
if (tt==11)
tt=0;
}
if(KEY4==0)
{
delay1ms(15); //延時(shí)15ms
if(KEY4==0)
while(KEY4==0);//等待按鍵釋放
if (tt==0)//手動(dòng)選臺(tái)判斷，保證能循環(huán)選擇，不嚴(yán)禁能工作，請(qǐng)忽略
tt=12;
tt--;
switch(tt) //手動(dòng)選臺(tái)
{
case 0:
{
radio_write_data[0]=0x2A;
radio_write_data[1]=0x30;
break;
}
case 1:
{
radio_write_data[0]=0x2B;
radio_write_data[1]=0x3C;
break;
}
case 2:
{
radio_write_data[0]=0x2B;
radio_write_data[1]=0xB6;
break;
}
case 3:
{
radio_write_data[0]=0x2C;
radio_write_data[1]=0x86;
break;
}
case 4:
{
radio_write_data[0]=0x2D;
radio_write_data[1]=0x6E;
break;
}
case 5:
{
radio_write_data[0]=0x2E;
radio_write_data[1]=0xB7;
break;
}
case 6:
{
radio_write_data[0]=0x30;
radio_write_data[1]=0xD0;
break;
}
case 7:
{
radio_write_data[0]=0x31;
radio_write_data[1]=0x0D;
break;
}
case 8:
{
radio_write_data[0]=0x31;
radio_write_data[1]=0xA0;
break;
}
case 9:
{
radio_write_data[0]=0x32;
radio_write_data[1]=0xB9;
break;
}
case 10:
{
radio_write_data[0]=0x33;
radio_write_data[1]=0x02;
break;
}
case 11:
{
radio_write_data[0]=0x33;
radio_write_data[1]=0x4B;
break;
}
}
radio_write_data[2]=0xC0;
radio_write_data[3]=0x17;
radio_write_data[4]=0x00;
radio_write();
if (tt==0)
tt=11;
}
}
}

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