RDA5820和51单片机制作的FM数字收音机源代码及电路原理图.doc

* 晶振:8M*/#include #include #define ChannelCount 50 /最多支持多少个台，因为常驻内存，多了RAM放不下#define uchar unsigned char#define uint unsigned inttypedef structuchar Freq;uchar Rssi;ChannelInfo;sbit SDA = P20;sbit SCL = P21;sbit key1 = P34;sbit key2 = P27;sbit key3 = P26;sbit key4 = P25; / P37;sbit LcdEn = P34;sbit LcdRs = P35;uchar Channel = 0;uchar FreqTune = 0;const uint MinFreq = 870; /起始频率 * 100KHzconst uint MaxFreq = 1080; /最高频率 * 100KHzconst uchar FmAddr = 022; /FM模块IIC 地址const uchar EpAddr = 0xA0; /24C02 EPPRom 的地址uchar RSSI = 0; /信号强度uchar ChannelTuneChannelCount;uchar code LevlChar58 =0x1F,011,0x0A,004,004,004,004,004,000,000,000,000,000,000,006,0x1E,000,000,000,000,006,0x1E,0x1E,0x1E, /显示型号强度的自定义字符000,000,006,0x1E,0x1E,0x1E,0x1E,0x1E,006,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E;uchar vol = 08; /音量00xFuchar Func = 00; /当前功能号bit AutoScan = 0; /标记当前是不是在自动搜台bit Mute = 0; /标记是否被静音uchar KeyNumber = 0;void OpenIIC();void CloseIIC();void IICWrite(uchar uaddr, uchar romaddr, uint rdata,bit _i6b);void IICWriteByte( uchar byte );uint IICRead(uchar uaddr, uchar romaddr,bit _i6b);uchar IICReadByte(bit next);void FM_SetFreq();void FM_SetVolume();uint FM_ReadReg(uchar regAddr); /读取FM模块的寄存器void FM_WriteReg(uchar regAddr,uint dat); /写FM模块的寄存器uchar FM_GetRSSI(); /获取当前的信号强大void Delay(uint c);bit KeyScan();void BeginScan();void Lcd_DispNumber(uint number);void Lcd_Init();void Lcd_Comm(uchar cmd);void Lcd_Data(uchar dat);void Lcd_String(char* dat);void Lcd_DispRssi();void Lcd_DispFreq();void Lcd_Refresh();void Lcd_DispDiscript();void Eprom_LoadInitData();uint Eprom_Read(uchar addr,bit _16bit);void Eprom_Write(uchar addr,uint dat,bit _16bit);void main() P3 = 0xff;P2 = 0xff;Delay(10000); /延时，等待外部FM模块的启动Eprom_LoadInitData(); /从EppRom 加载频道音量等信息FM_WriteReg(2,0xd281); /启动FM模块FM_SetVolume(); /设置启动音量FM_SetFreq(); /设置默认频道的频率Lcd_Init();Lcd_Refresh();while(1)if( KeyScan()Lcd_Refresh();void Eprom_LoadInitData()uint result = 0;int i=0;result =Eprom_Read(0,0);if(result0) vol = (uchar)result 1;result =Eprom_Read(1,0);Channel = (uchar)result;for(i=0;iChannelCount;i+)result =Eprom_Read(i * 2 + 2,1);ChannelTunei = result;FreqTune = ChannelTuneChannel;void Eprom_Write(uchar addr,uint dat,bit _16bit)IICWrite(EpAddr,addr,dat,_16bit);uint Eprom_Read(uchar addr,bit _16bit)return IICRead(EpAddr,addr,_16bit);uint FM_ReadReg(uchar regAddr)return IICRead(FmAddr,regAddr,1);void FM_WriteReg(uchar regAddr,uint dat)IICWrite(FmAddr,regAddr,dat,1);void FM_SetFreq()FM_WriteReg(3,(FreqTune0)if(Mute)reg2H = FM_ReadReg(2);reg2H |= 04000;FM_WriteReg(2,reg2H);Mute = 0;FM_WriteReg(5,vol);elseMute = 1;reg2H = FM_ReadReg(2);reg2H &= 0xBFFF;FM_WriteReg(2,reg2H);Eprom_Write(0,vol+1,0);void Lcd_Init()uchar CGRamAddr = 040;int i,j;LcdEn = 0;Lcd_Comm(038);Lcd_Comm(0x0c);Lcd_Comm(006);Lcd_Comm(001); for(j=0;j5;j+)Lcd_Comm(CGRamAddr + 8 * j); /建立自定义字符 (显示信号强度的) for(i=0;i8;i+)Lcd_Data(LevlCharji);Delay(510);void Lcd_Comm(uchar cmd)LcdRs =0;P0 = cmd;Delay(50);LcdEn = 1;Delay(50);LcdEn = 0;void Lcd_Data(uchar dat)LcdRs = 1;P0 = dat;Delay(50);LcdEn = 1;Delay(50);LcdEn = 0;void Lcd_String(char* dat)char *p;int j, i=strlen(dat);for(j=0;ji;j+)p=dat + j;Lcd_Data(*p);void Lcd_DispRssi()int i;Lcd_Comm(080);for(i=0;i=1) Lcd_Data(001);if(RSSI=2) Lcd_Data(002);if(RSSI=3) Lcd_Data(003);if(RSSI=4) Lcd_Data(004);void Lcd_DispFreq()uint curFreq = MinFreq + FreqTune;int i;Lcd_Comm(085);for(i=5;i=1000)Lcd_Data(48 +curFreq /1000 % 10);Lcd_Data(48 +curFreq /100 % 10);Lcd_Data(48 +curFreq /10 % 10);Lcd_Data(.);Lcd_Data(48 + curFreq % 10);Lcd_Data(M);Lcd_Data(H);Lcd_Data(Z);void Lcd_DispDiscript()int i;Lcd_Comm(080+040);for(i=0;i15;i+)Lcd_Data( ); Lcd_Comm(080+040); switch(Func) case 0:Lcd_String(“Channel:”);Lcd_DispNumber(Channel+1);break;case 1:Lcd_String(“Volume:”);Lcd_DispNumber(vol);break;case 2:Lcd_String(“Tune”);break;case 3:Lcd_String(“Auto Scan”); void Lcd_Refresh()Lcd_DispRssi();Lcd_DispFreq();Lcd_DispDiscript();void Lcd_DispNumber(uint number)int i=0,len;char str6=0,0,0,0,0,0;char temp;dostri+ = 0 + (number % 10);number /= 10;while(number) ;len = strlen(str);for(i=0;i3)Func = 0;break;case 3:value = -1;break;case 4:value = 1;break; if(KeyNumber2) if(Func=0)if(value 0 & ChannelChannelCount) | (value 0)Channel+=value;FreqTune= ChannelTuneChannel;FM_SetFreq();Eprom_Write(1,Channel, 0);else if(Func=1)if(value 0 & vol0xF) | (value 0)vol+=value;FM_SetVolume();else if(Func=2)if(value 0 & FreqTune0xd2) | (value 0)FreqTune+=value;ChannelTuneChannel = FreqTune;FM_SetFreq();Eprom_Write(Channel * 2 + 2 ,FreqTune,1);else if(Func=3) /开始自动扫描AutoScan = 1;BeginScan();AutoScan = 0;Channel = 0;FreqTune = ChannelTune0;Func = 0;FM_SetFreq();/覆盖EppRom中的所有的频道for(i=0;iChannelCount;i+)temp = ChannelTunei;Eprom_Write(i * 2+2,temp,1);Eprom_Write(001,0,0); /重置EPPROM中的频道号为0 KeyNumber=0; return keyRel; /全自动搜索void BeginScan()uint state;int i=0,count=0;bit cmp = 0;uint seekth = 08; /灵敏度 0127,默认为8 灵敏度越低越可能搜索到假台，高了可能一些信号弱一点的频道被跳过。uint reg5H;uint tempTune = 0;for(i=0;iChannelCount;i+) /清除原有的电台数据ChannelTunei=0;reg5H = FM_ReadReg(005);reg5H = (reg5H & 0x80FF) | (seekth7);FM_WriteReg(005,reg5H);for(i=0;i 7 ) & 01;while(!cmp);Delay(100);state = FM_ReadReg(0x0B);cmp = (state 8 ) & 01;if(cmp)ChannelTunecount=i;count+;if(count=ChannelCount) break; uchar FM_GetRSSI()uint regVal =FM_ReadReg(0x0b);regVal = regVal9;return (uchar)(regVal/16);void Delay(uint c)int i=0;for(i=0;ic;i+);uint IICRead(uchar uaddr, uchar ramAddr,bit _16b)uint buf;OpenIIC();IICWriteByte(uaddr);IICWriteByte(ramAddr);OpenIIC();IICWriteByte(uaddr | 001); if(_16b)buf = IICReadByte