File content as of revision 4:3bf9d70a48c8:

/*
RDA5807M FM RDS Radio using the EFM32 Gecko Segment LCD
RDS information is displayed using a PC terminal
 
Use:
switches PB0 and PB1 for frequency search
Volume controlled by the Touch Slider
Indicators: 
Signal level - Ring Segement Display
Stereo received - Antenna Segment Display
RDS available - LED0
*/
 
#include "mbed.h"
#include "RDA5807M.h"
#include "EFM32_SegmentLCD.h"
#include "EFM32_CapSenseSlider.h"
 
 
RDA5807M radio(PC4, PC5);   // sda - scl
 
Serial pc(USBTX, USBRX);
 
InterruptIn scan_up(SW1);
InterruptIn scan_down(SW0); 
 
DigitalOut led1(LED1);
DigitalOut led0(LED0);
 
silabs::EFM32_SegmentLCD segmentDisplay;
silabs::EFM32_CapSenseSlider capSlider;
LowPowerTimeout wakeup;
 
Timer t1;
 
int x,n,i,l,wake,signal,lastsignal,volume,laststereo;
float lastfreq;
char Station[10],lastStationName[10],vol[4],lastCT[12];
char RDStxt[70],RDStxt1[70],RDStxt2[70],text1[70],lasttext1[70],text2[70],lasttext2[70];
 
void displayrefresh(),getrds(),RTrefresh();
 
void scan_upIRQ() {
    radio.SeekUp(); 
}  
 
void scan_downIRQ() {
    radio.SeekDown();    
}

void callback(void) {
    wake = 1;
}
 
void slideCallback(void) {
    volume = capSlider.get_position()/3;        
    if(volume > 15){volume = 15;}
    if(volume < 0){volume = 0;}  
    radio.Volume(volume);
    sprintf(vol,"Vol %d", volume);
    segmentDisplay.Write(vol);
    t1.reset();t1.start();  
}  
 
int main() { 
 
    radio.Reset();      // reset and power up radio chip 
    segmentDisplay.Write("RdA5807");
    wait(1); 
    segmentDisplay.Write("RDS FM");
    wait(1);
    segmentDisplay.Write("Radio");    
    capSlider.start();
    capSlider.attach_slide(-1, slideCallback);   
    scan_up.fall(scan_upIRQ);     
    scan_down.rise(scan_downIRQ); 
    wait(1);     
    
    while(1){    
        radio.ProcessData();
        displayrefresh();
        getrds();
        if(t1.read()>3){strcpy(lastStationName," ");t1.stop();} 
        wait_ms(1);
        wakeup.attach(callback, 0.05f);  // MCU average power now 1mA
        wake = 0;
        while(!wake) sleep();        
    }
}
 
void displayrefresh()
{   
    if (strcmp(lastStationName, radio.StationName) != 0){
        if(strlen(radio.StationName)<9){
            n=0;for(i=0;i<(8);i++){ // remove non-printable ASCCi error characters               
                if(radio.StationName[i] > 31){          
                    Station[n] = radio.StationName[i];         
                    n++;
                    }
                }              
            segmentDisplay.Write(Station);
            pc.printf("Station:\n%s\n\n",Station);
            strcpy(lastStationName,radio.StationName);
            }
        }    
    if(lastfreq != radio.freq/1000){lastfreq = radio.freq/1000;
        if(radio.freq<100000){            
            segmentDisplay.Number(radio.freq/10);segmentDisplay.Symbol(LCD_SYMBOL_DP10,1);
            }
            else {segmentDisplay.Number(radio.freq/100);segmentDisplay.Symbol(LCD_SYMBOL_DP10,0);}
            led0=0;
        }
    if(laststereo != radio.stereo){
        if(radio.stereo){segmentDisplay.Symbol(LCD_SYMBOL_ANT,1);}
            else{segmentDisplay.Symbol(LCD_SYMBOL_ANT,0);}
        laststereo = radio.stereo;
        }        
    if(lastsignal != radio.signal){
        signal=radio.signal;
        for (i = 0; i < 8; i++)
            {segmentDisplay.ARing(i, 0);}    
        if(signal>4){segmentDisplay.ARing(0, 1);}
        if(signal>9){segmentDisplay.ARing(1, 1);}
        if(signal>14){segmentDisplay.ARing(2, 1);}
        if(signal>19){segmentDisplay.ARing(3, 1);}
        if(signal>25){segmentDisplay.ARing(4, 1);}
        if(signal>30){segmentDisplay.ARing(5, 1);}
        if(signal>35){segmentDisplay.ARing(6, 1);}
        if(signal>40){segmentDisplay.ARing(7, 1);}        
        lastsignal=radio.signal;       
        }
    if(strcmp(RDStxt1, lasttext1) != 0 || strcmp(RDStxt2, lasttext2) != 0){
        RTrefresh();
        }
    if(strcmp(lastCT, radio.CTtime) !=0){    
        pc.printf("Time: %s\n",radio.CTtime);
        strcpy(lastCT,radio.CTtime);
        if(led0==1){RTrefresh();}
        }       
}

void RTrefresh()
{
        pc.printf("\n-------------------------------------------\n");
        pc.printf("Station:\n%s\n\n",Station);
        pc.printf("RT:\n%s\n",RDStxt1);
        pc.printf("%s\n\n",RDStxt2);
        pc.printf("Time: %s\n",radio.CTtime);    
        memset(lasttext1, '\0', sizeof(lasttext1));strcpy(lasttext1, RDStxt1);           
        memset(lasttext2, '\0', sizeof(lasttext2));strcpy(lasttext2, RDStxt2); 
        led0=1;
}        
 
void getrds()
{    
   if(strlen(radio.RDSText)>3){               
        memset(RDStxt1, '\0', sizeof(RDStxt1));
        memset(RDStxt2, '\0', sizeof(RDStxt2));
                                 
    // format into 2 lines of text seperated by first 'space' after 30 characters
        strcpy(RDStxt1,radio.RDSText);
        n=strlen(RDStxt1);    
        for ( i = 0; i < (n); i++ ){
            if (i>30 && (RDStxt1[i] == ' ') ){              
                RDStxt1 [strlen(RDStxt1) - (n-i)] = '\0';               
                l=strlen(RDStxt1);
                x=1;
                break; // break if more than 30 characters with space 
                }
            if(i>39){
                RDStxt1 [strlen(RDStxt1) - (n-i)] = '\0';
                l=strlen(RDStxt1);
                x=1;
                break; //break if more than 39 characters with no spaces
                }
            }
        if(x==1){           
            strcpy (RDStxt2, radio.RDSText + l);
            while(RDStxt2[0]==' '){
                strcpy (RDStxt2, (RDStxt2 + 1));
            }
            x=0;
        }
    }   
}