main.cpp

00001 /*
00002 RDA5807M FM RDS Radio using the EFM32 Gecko Segment LCD
00003 RDS information is displayed using a PC terminal
00004  
00005 Use:
00006 switches PB0 and PB1 for frequency search
00007 Volume controlled by the Touch Slider
00008 Indicators: 
00009 Signal level - Ring Segement Display
00010 Stereo received - Antenna Segment Display
00011 RDS available - LED0
00012 */
00013  
00014 #include "mbed.h"
00015 #include "RDA5807M.h"
00016 #include "EFM32_SegmentLCD.h"
00017 #include "EFM32_CapSenseSlider.h"
00018  
00019  
00020 RDA5807M radio(PC4, PC5);   // sda - scl
00021  
00022 Serial pc(USBTX, USBRX);
00023  
00024 InterruptIn scan_up(SW1);
00025 InterruptIn scan_down(SW0); 
00026  
00027 DigitalOut led1(LED1);
00028 DigitalOut led0(LED0);
00029  
00030 silabs::EFM32_SegmentLCD segmentDisplay;
00031 silabs::EFM32_CapSenseSlider capSlider;
00032 LowPowerTimeout wakeup;
00033  
00034 Timer t1;
00035  
00036 int x,n,i,l,wake,signal,lastsignal,volume,laststereo;
00037 float lastfreq;
00038 char Station[10],lastStationName[10],vol[4],lastCT[12];
00039 char RDStxt[70],RDStxt1[70],RDStxt2[70],text1[70],lasttext1[70],text2[70],lasttext2[70];
00040  
00041 void displayrefresh(),getrds(),RTrefresh();
00042  
00043 void scan_upIRQ() {
00044     radio.SeekUp(); 
00045 }  
00046  
00047 void scan_downIRQ() {
00048     radio.SeekDown();    
00049 }
00050 
00051 void callback(void) {
00052     wake = 1;
00053 }
00054  
00055 void slideCallback(void) {
00056     volume = capSlider.get_position()/3;        
00057     if(volume > 15){volume = 15;}
00058     if(volume < 0){volume = 0;}  
00059     radio.Volume(volume);
00060     sprintf(vol,"Vol %d", volume);
00061     segmentDisplay.Write(vol);
00062     t1.reset();t1.start();  
00063 }  
00064  
00065 int main() { 
00066  
00067     radio.Reset();      // reset and power up radio chip 
00068     segmentDisplay.Write("RdA5807");
00069     wait(1); 
00070     segmentDisplay.Write("RDS FM");
00071     wait(1);
00072     segmentDisplay.Write("Radio");    
00073     capSlider.start();
00074     capSlider.attach_slide(-1, slideCallback);   
00075     scan_up.fall(scan_upIRQ);     
00076     scan_down.rise(scan_downIRQ); 
00077     wait(1);     
00078     
00079     while(1){    
00080         radio.ProcessData();
00081         displayrefresh();
00082         getrds();
00083         if(t1.read()>3){strcpy(lastStationName," ");t1.stop();} 
00084         wait_ms(1);
00085         wakeup.attach(callback, 0.05f);  // MCU average power now 1mA
00086         wake = 0;
00087         while(!wake) sleep();        
00088     }
00089 }
00090  
00091 void displayrefresh()
00092 {   
00093     if (strcmp(lastStationName, radio.StationName) != 0){
00094         if(strlen(radio.StationName)<9){
00095             n=0;for(i=0;i<(8);i++){ // remove non-printable ASCCi error characters               
00096                 if(radio.StationName[i] > 31){          
00097                     Station[n] = radio.StationName[i];         
00098                     n++;
00099                     }
00100                 }              
00101             segmentDisplay.Write(Station);
00102             pc.printf("Station:\n%s\n\n",Station);
00103             strcpy(lastStationName,radio.StationName);
00104             }
00105         }    
00106     if(lastfreq != radio.freq/1000){lastfreq = radio.freq/1000;
00107         if(radio.freq<100000){            
00108             segmentDisplay.Number(radio.freq/10);segmentDisplay.Symbol(LCD_SYMBOL_DP10,1);
00109             }
00110             else {segmentDisplay.Number(radio.freq/100);segmentDisplay.Symbol(LCD_SYMBOL_DP10,0);}
00111             led0=0;
00112         }
00113     if(laststereo != radio.stereo){
00114         if(radio.stereo){segmentDisplay.Symbol(LCD_SYMBOL_ANT,1);}
00115             else{segmentDisplay.Symbol(LCD_SYMBOL_ANT,0);}
00116         laststereo = radio.stereo;
00117         }        
00118     if(lastsignal != radio.signal){
00119         signal=radio.signal;
00120         for (i = 0; i < 8; i++)
00121             {segmentDisplay.ARing(i, 0);}    
00122         if(signal>4){segmentDisplay.ARing(0, 1);}
00123         if(signal>9){segmentDisplay.ARing(1, 1);}
00124         if(signal>14){segmentDisplay.ARing(2, 1);}
00125         if(signal>19){segmentDisplay.ARing(3, 1);}
00126         if(signal>25){segmentDisplay.ARing(4, 1);}
00127         if(signal>30){segmentDisplay.ARing(5, 1);}
00128         if(signal>35){segmentDisplay.ARing(6, 1);}
00129         if(signal>40){segmentDisplay.ARing(7, 1);}        
00130         lastsignal=radio.signal;       
00131         }
00132     if(strcmp(RDStxt1, lasttext1) != 0 || strcmp(RDStxt2, lasttext2) != 0){
00133         RTrefresh();
00134         }
00135     if(strcmp(lastCT, radio.CTtime) !=0){    
00136         pc.printf("Time: %s\n",radio.CTtime);
00137         strcpy(lastCT,radio.CTtime);
00138         if(led0==1){RTrefresh();}
00139         }       
00140 }
00141 
00142 void RTrefresh()
00143 {
00144         pc.printf("\n-------------------------------------------\n");
00145         pc.printf("Station:\n%s\n\n",Station);
00146         pc.printf("RT:\n%s\n",RDStxt1);
00147         pc.printf("%s\n\n",RDStxt2);
00148         pc.printf("Time: %s\n",radio.CTtime);    
00149         memset(lasttext1, '\0', sizeof(lasttext1));strcpy(lasttext1, RDStxt1);           
00150         memset(lasttext2, '\0', sizeof(lasttext2));strcpy(lasttext2, RDStxt2); 
00151         led0=1;
00152 }        
00153  
00154 void getrds()
00155 {    
00156    if(strlen(radio.RDSText)>3){               
00157         memset(RDStxt1, '\0', sizeof(RDStxt1));
00158         memset(RDStxt2, '\0', sizeof(RDStxt2));
00159                                  
00160     // format into 2 lines of text seperated by first 'space' after 30 characters
00161         strcpy(RDStxt1,radio.RDSText);
00162         n=strlen(RDStxt1);    
00163         for ( i = 0; i < (n); i++ ){
00164             if (i>30 && (RDStxt1[i] == ' ') ){              
00165                 RDStxt1 [strlen(RDStxt1) - (n-i)] = '\0';               
00166                 l=strlen(RDStxt1);
00167                 x=1;
00168                 break; // break if more than 30 characters with space 
00169                 }
00170             if(i>39){
00171                 RDStxt1 [strlen(RDStxt1) - (n-i)] = '\0';
00172                 l=strlen(RDStxt1);
00173                 x=1;
00174                 break; //break if more than 39 characters with no spaces
00175                 }
00176             }
00177         if(x==1){           
00178             strcpy (RDStxt2, radio.RDSText + l);
00179             while(RDStxt2[0]==' '){
00180                 strcpy (RDStxt2, (RDStxt2 + 1));
00181             }
00182             x=0;
00183         }
00184     }   
00185 }