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发表于 2008-1-9 14:00:50
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无锡硅动力的SP3767和TEA5767完全兼容,有中文资料
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(2,0xc0); //TEA5767写地址
if(!iic_testack)
{
for(i=0;i<5;i++)
{
iic_write8bit(radio_write_data);
iic_ack;
}
}
iic_stop(2);
}
//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=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();
}
//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
}
//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(bit mode)
{
radio_read();
if(mode)
{
frequency+=100;
if(frequency>max_freq)
frequency=min_freq;
}
else
{
frequency-=100;
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
{
radio_read();
disp_freq(9,1);
}
} |
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