C51控制FM Radio---NXP TEA5766

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程序开始是参考OURAVR网友的例子成功收到台，由于程序生成的hex文件太大，2051装不下，只是放在博客发表，一直没有时间整理出来。后来深圳市广视美电子有限公司的老姜发了一份SP3767的参考代码给我，通过学习SP3767的代码，发现许多好的思路和方法，结合我自己开始写的的程序，修修改改改成了现在的程序。

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感谢OURAVR的网友和深圳市广视美电子有限公司的老姜提供的程序。 OURAVR网友原帖的地址：http://www.ouravr.com/bbs/bbs_content.jsp?bbs_sn=1117837&bbs_page_no=1&search_mode=1&search_text=5767&bbs_id=9999

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#include<reg51.H> #include<math.h> #include<I2C.c> sbit KEY_0 = P1^2; //S3键，自动向上收台 sbit KEY_1 = P1^3; //S2键，自动向下收台 sbit KEY_2 = P1^4; //S1键，手动收台 sbit have = P3^7; //收台标志， sbit band = P3^5; //边界标志，表示频率到达最小或最大值 #define max_freq 1080 #define min_freq 875 #define point 0xfe //小数点 unsigned char code led_7[10]={0x03,0x9f,0x25,0x0d,0x99,0x49,0x41,0x1f,0x01,0x09}; //0..9，数码管段码表 unsigned char dis_buff[4]={3,5,9,0}; //显示缓冲区，低位在前 unsigned char radio_write_data[5]={0x2d,0x56,0x20,0x11,0x00}; //要写入TEA5767的数据 unsigned char radio_read_data[5]; //TEA5767读出的状态 unsigned int default_pll=0x2d56; //0x2d56; //默认存台的pll,95.3MHz unsigned int pll; unsigned long frequency = 935; unsigned int max_pll=0x339b; //108MHz时的pll, unsigned int min_pll=0x9000; //70MHz时的pll` void uart_send_byte(unsigned char dat) { SBUF = dat; while (TI == 0); //循环等待 TI = 0; } //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=((frequency * 100000) + 225000) >> 13; //频率单位:k ; else pll=((frequency * 100000) - 225000) >> 13; //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)npll << 13) - 225000) / 100000) + 1; //频率单位:KHz else frequency=((((unsigned long)npll << 13) + 225000) / 100000) + 1; //频率单位:KHz } //频率值送显示缓冲区，低位在前 // 高 108.0 低 Mhz //------------------ //位数： void frequency_to_disbuff(void) { //unsigned long fre; //fre=f/100; dis_buff[3]=frequency / 1000; //第1位，1080/1000=1 dis_buff[2]=frequency / 100 %10; //第2位，1080/100=10,10%10=0 dis_buff[1]=frequency % 100 /10; //第3位, 1080%100=80,80/10=8 dis_buff[0]=frequency % 10; //第4位, 1080%10=0 } void FM_dis(void) { frequency_to_disbuff(); uart_send_byte(led_7[dis_buff[0]]); uart_send_byte(led_7[dis_buff[1]]&point); uart_send_byte(led_7[dis_buff[2]]); if (dis_buff[3]==0) uart_send_byte(0xff); else uart_send_byte(led_7[dis_buff[3]]); } //写5767 void radio_write(void) { unsigned char i; iic_start(); iic_write8bit(0xc0); //TEA5767写地址 waitack(); for (i=0; i<5; i++) { iic_write8bit(radio_write_data[i]); waitack(); } 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 waitack(); 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(); } //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() { radio_read(); frequency ++; if (frequency > max_freq) { frequency = min_freq; band = 0; } else band = 1; 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,频率增加搜台 void auto_searchup() { radio_read(); if (frequency>max_freq) { frequency=min_freq; band = 0; } else band = 1; get_pll(); radio_write_data[2]=0xa0; 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(); } //自动搜台,频率减小搜台 void auto_searchdown() { radio_read(); if (frequency<min_freq) { frequency=max_freq; band = 0; } else band = 1; get_pll(); 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(); } //ms延时 void delay(unsigned int i) { unsigned char j; do { j = 163; do { } while (j --); } while (i --); } void main() { SCON = 0x00; //串口初始化，工作方式0, 同步移位寄存器输出方式 FM_dis(); delay(10); radio_write(); while (1) { radio_read(); P1=0xff; if (radio_read_data[0]&0x80) //搜台成功标志 have = 0; else have = 1; //向上搜台 if (KEY_0 == 0) { delay(10); if (KEY_0 == 0) { auto_searchup(); while (KEY_0 == 0) { FM_dis(); delay(5); } } } //向下搜台 if (KEY_1==0) { if (KEY_1 == 0) { auto_searchdown(); while (KEY_1 == 0) { FM_dis(); delay(5); } } } //手动搜台，每次按下增加频率+0.1Mhz if (KEY_2==0) { if (KEY_2 == 0) { search(); while (KEY_2 == 0) { FM_dis(); delay(5); } } } } }