急:89C52用IIC控制TEA5767的C程序;
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发布时间：2022-04-24 11:03
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时间：2023-10-10 17:44
#include"24c02.h"
#include"lcm.h"
#define max_freq 108000
#define min_freq 87500
unsigned char radio_write_data[5]={0xb1,0xa0,0x20,0x11,0x00}; //要写入TEA5767的数据
unsigned char radio_write_data1[5]={0x31,0xa0,0x20,0x11,0x00}; //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 pll=0;
float frequency=0;
void get_frequency(void);
extern void sta();
extern void wrbyt(unsigned char byt);
extern bit iic_testack() ;
extern void mack();
extern void stop();
extern unsigned char rdbyt();
extern uchar frq[10];
sbit ds_1302=P1^5;
void radio_write(void)
{
unsigned char i;
stop();
sta();
wrbyt(0xc0); //TEA5767写地址
if(!iic_testack())
{
for(i=0;i<5;i++)
{
wrbyt(radio_write_data1[i]);
mack();
}
}
stop();
}
//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;
stop();
sta();
wrbyt(0xc1); //TEA5767读地址
if(!iic_testack())
{
for(i=0;i<5;i++)
{
radio_read_data[i]=rdbyt();
mack();
}
}
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+=50;
if(frequency>max_freq)
frequency=min_freq;
}
else
{
frequency-=50;
if(frequency<min_freq)
frequency=max_freq;
}
EA=0;
get_pll();
radio_write_data1[0]=pll/256;
radio_write_data1[1]=pll%256;
radio_write_data1[2]=0x20;
radio_write_data1[3]=0x11;
radio_write_data1[4]=0x00;
radio_write();
EA=1;
}
void set_frq(uchar *frq_m)
{
EA=0;
frequency=(float)((*frq_m)*1000+(*(frq_m+1))*100+(*(frq_m+2))*10+(*(frq_m+3)))*100;
if((frequency<87500)||(frequency>108500))
{
EA=1;
*frq_m=0;
*(frq_m+1)=0;
*(frq_m+2)=0;
*(frq_m+3)=0;
return;
}
get_pll();
radio_write_data1[0]=pll/256;
radio_write_data1[1]=pll%256;
radio_write_data1[2]=0x20;
radio_write_data1[3]=0x11;
radio_write_data1[4]=0x00;
radio_write();
EA=1;
}
void auto_search(uchar dec)
{
int k=0;
unsigned char aa[6]={0};
ds_1302=0;
radio_write();
if(dec)
{
while(frequency<max_freq)
{
get_pll();
radio_write_data1[0]=pll/256;
radio_write_data1[1]=pll%256;
radio_write_data1[2]=0xA0;
radio_write_data1[3]=0x11;
radio_write_data1[4]=0x00;
radio_write_data1[0]|=0x40;
radio_write();
for(k=0;k<20000;k++)
EA=0;
radio_read();
if((radio_read_data[0]&0x80))
{
EA=0;
frequency+=50;
return;
}
}
frequency=min_freq;
}
else
{
while(frequency>min_freq)
{
get_pll();
radio_write_data1[0]=pll/256;
radio_write_data1[1]=pll%256;
radio_write_data1[2]=0x20;
radio_write_data1[3]=0x11;
radio_write_data1[4]=0x00;
radio_write_data1[0]|=0x40;
radio_write();
for(k=0;k<20000;k++)
EA=0;
radio_read();
if((radio_read_data[0]&0x80))
{
EA=0;
frequency-=50;
return;
}
}
frequency=max_freq;
}
}
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