这几天做个项目,用到飞利浦的TEA5767的收音机模块,在网上搜了下相关的内容,发现很多人都在问,可是提供编程指导的很少,可能是高手都不屑回答这些小问题吧。在这里我把我的部分程序及TEA5767的相关资料放上来吧,给需要的人一些参考。(注:无锡硅动力的SP3767和TEA5767完全兼容,有中文资料)
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。
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;i<5;i++)
- {
- iic_write8bit(radio_write_data[i]);
- iic_ack();
- }
- }
- iic_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;
- iic_start();
- iic_write8bit(0xc1); //TEA5767读地址
- if(!iic_testack())
- {
- for(i=0;i<5;i++)
- {
- radio_read_data[i]=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);
- }
- }