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???? 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;imax_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);
}
}
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