通过单片机模拟I2C总线来控制TEA5767收音模块(具有自动搜索功能).doc

/*功能:通过单片机模拟I2C总线来控制TEA5767收音模块,通过4个按键 调整收音频率,达到换台的目的设计者:姚松金联系QQ:190719416编写日期:2015年7月20日*/#include #include #include #include #define uchar unsigned char#define uint unsigned int/*位定义及变量定义*/sbit key5=P15;/手动搜索加sbit key6=P16;/手动搜索减sbit key7=P14;/向上自动搜索sbit key4=P17;/向下自动搜索uchar idata sbuf5;/要写入5767的数据uchar idata rbuf5;/缓存读出的数据uint temp1;/计算频率合成时用的变量unsigned long PLL,frequency=104300;/开机初始化的电台频率为104.3MHzextern bit flag1,flag2;bit led_flag,hisi;uchar code led2=0x7f,0x3f,0x1f,0x0f,0x07,0x03,0x01,0x00,/从左边开始递增亮灯0xfe,0xfc,0xf8,0xf0,0xe0,0xc0,0x80,0x00,/从右边开始递增亮灯0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff,/从左边开始递减灭灯0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff,/从右边开始递减灭灯0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe,/一个亮灯从左边开始移动0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,/一个亮灯从右边开始移动0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01,/一个暗灯从左边开始移动0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,/一个暗灯从右边开始移动0x81,0xc3,0xe7,0xff,0xe7,0xc3,0x81,0xff,/从外向内灭灯/从内向外灭灯0x7e,0x3c,0x18,0x00,0x18,0x3c,0x7e,0xff;/*子函数声明*/void delayus(uchar x);void delayms (uchar b);void iic_start();void iic_stop();void iic_ack();/i2c应答bit iic_testack();void iic_write8bit(uchar input);/i2c写8位数uchar iic_read8bit();/读取8bit数据void write_com(uchar com);/写1602命令函数void write_data(uchar date);/写1602数据函数void init1602();/1602初始化函数void LCD1602_String(uchar *str);void LCD1602_setXY(uchar y,uchar x);/*计算PLL（单位KHZ）函数*/void get_pll() unsigned long freq1,y=frequency;freq1=y;hisi=sbuf2&0x10;if(hisi)PLL=(uint)(float)(freq1+225)/(float)8.192);elsePLL=(uint)(float)(freq1-225)/(float)8.192);/*计算频率（单位HZ）函数*/void get_frequency()uint y=0;y=PLL; hisi=sbuf2&0x10; if(hisi)frequency=(unsigned long int)(y*(float)8.192-225);elsefrequency=(unsigned long int)(y*(float)8.192+225);/*写5个字节到收音模块,在写字节前需要先写器件地址*/void radio_write(void) uchar i; iic_start(); iic_write8bit(0xc0); /TEA5767写地址 if(!iic_testack() for(i=0;i5;i+) iic_write8bit(sbufi); iic_ack(); delayus(5); iic_stop(); /*从收音模块读5个字节出来,读字节前需要先写器件的读地址指令*/void radio_read()uchar i,tempH,tempL;iic_start();iic_write8bit(0xc1);/写读命令iic_testack(); for(i=0;i108000)/频率如果大于108.5MHzfrequency=87500;/频率设定为87.5MHz else frequency-=100;/手动设置频率,-0.1MHz; if(frequency108000)/频率如果大于108.5MHzfrequency=87500;else frequency-=100;/手动设置频率,-0.1MHz; if(frequency=7);sbuf0&=0x7f;radio_write();LCDshow();/*收音机按键扫描函数*/void radio_key_scan(void)static bit curr_encoder_b,last_encoder_b;static bit st=0;uchar i,num,led;temp1+;if(led_flag)if(temp14000)temp1=0;if(led=79)led=0;P3=led2led;led+;if(flag1=1) /此语句写空格刷新显示flag1=0;write_com(0x80+1);write_data( );write_com(0x80+2);write_data( );radio_read();num=(rbuf3&0xf0)/16/4;/显示天线信号强度for(i=0;inum;i+) write_com(0x80+i);write_data(i); LCD1602_setXY(1,11);if(rbuf2&0x80)write_com(0x80+14);/显示立体声标志write_data(3);write_com(0x80+15);write_data(4);else write_com(0x80+14);write_data( );write_com(0x80+15);write_data( ); radio_write();LCDshow();if(key7=0&key4!=0)/控制跑马灯开启或者关闭delayms(10);if(key7=0&key4!=0)Auto_Search(1);if(key4=0&key7!=0)delayms(10);if(key4=0&key7!=0)Auto_Search(0); if(key4=0&key7=0&flag1=1)flag1=0;led_flag=led_flag;/跑马灯标志位if(led_flag)P3=0x00; /当标志位为真时关闭跑马灯,系统上电默认跑马灯是开启的else P3=0xff;while(key4=0|key7=0);if(key5&key6)st=0;return;last_