Getting correct Time from RDS with SI4703

Using Arduino Programming Questions
1

Hi Guys
I have a Nano and a SI4703 Radio Module. It works so far: I get a clear Signal, can listen to Radio and get (sometimes) RDS Infos like Station, etc..
Actually I need only the Time to set the RTC. But I can't get a correct Time - either I get Garbage, a completely wrong Time or nothing.
I tried different Libraries and Examples, now I use this:

/*
   Under construction...  See si570x_02_TFT_display

   Test and validation of SI4703 RDS feature.

    Arduino Pro Mini and SI4703 wire up

    | Device  Si470X |  Arduino Pin  |
    | ---------------| ------------  |
    | RESET          |     14/A0     |
    | SDIO           |     A4        |
    | SCLK           |     A5        |


  ATTENTION:
   Please, avoid using the computer connected to the mains during testing. Used just the battery of your computer.
   This sketch was tested on ATmega328 based board. If you are not using a ATmega328, please check the pins of your board.

   By Ricardo Lima Caratti, 2020.
*/

#include <SI470X.h>

#define RESET_PIN 14  // On Arduino Atmega328 based board, this pin is labeled as A0 (14 means digital pin instead analog)

#define MAX_DELAY_RDS 40  // 40ms - polling method
#define MAX_DELAY_STATUS 2000

long rds_elapsed = millis();
long status_elapsed = millis();


SI470X rx;

void setup() {

  Serial.begin(9600);
  while (!Serial)
    ;
  Serial.println("\nPU2CLR SI470X Arduino Library.");


  rx.setup(RESET_PIN, A4 /* SDA pin  for Arduino ATmega328 */);

  rx.setRDS(true);  // Turns RDS on

  rx.setVolume(6);

  delay(500);

  // Select a station with RDS service in your place
  Serial.print("\nTuning 9470 MHz");
  rx.setFrequency(9470);  // It is the frequency you want to select in MHz multiplied by 100.

  // Enables SDR
  rx.setRds(true);
  rx.setRdsMode(1);
  rx.setMono(false);

  showHelp();
}

void showHelp() {
  Serial.println("Type U to increase and D to decrease the frequency");
  Serial.println("Type S or s to seek station Up or Down");
  Serial.println("Type + or - to volume Up or Down");
  Serial.println("Type 0 to show current status");
  Serial.println("Type ? to this help.");
  Serial.println("==================================================");
  delay(5000);
}

// Show current frequency
void showStatus() {
  char aux[80];
  sprintf(aux, "\nYou are tuned on %u MHz | RSSI: %3.3u dbUv | Vol: %2.2u | Stereo: %s\n", rx.getFrequency(), rx.getRssi(), rx.getVolume(), (rx.isStereo()) ? "Yes" : "No");
  Serial.print(aux);
  status_elapsed = millis();
}



/*********************************************************
   RDS
 *********************************************************/
char *programInfo;
char *stationName;
char *rdsTime;


void showRdsData() {
  if (programInfo) {
    Serial.print("\nProgram Info...: ");
    Serial.println(programInfo);
  }

  if (stationName) {
    Serial.print("\nStation Name...: ");
    Serial.println(stationName);
  }

  if (rdsTime) {
    Serial.print("\nUTC / Time....: ");
    Serial.println(rdsTime);
  }
}

void checkRDS() {
  if (rx.getRdsReady()) {
    programInfo = rx.getRdsProgramInformation();
    stationName = rx.getRdsStationName();
    rdsTime = rx.getRdsTime();
    showRdsData();
  }
}



void loop() {

  if ((millis() - rds_elapsed) > MAX_DELAY_RDS) {
    checkRDS();
    rds_elapsed = millis();
  }

  if ((millis() - status_elapsed) > MAX_DELAY_STATUS) {
    showStatus();
    status_elapsed = millis();
  }

  if (Serial.available() > 0) {
    char key = Serial.read();
    switch (key) {
      case '+':
        rx.setVolumeUp();
        break;
      case '-':
        rx.setVolumeDown();
        break;
      case 'U':
      case 'u':
        rx.setFrequencyUp();
        break;
      case 'D':
      case 'd':
        rx.setFrequencyDown();
        break;
      case 'S':
        rx.seek(SI470X_SEEK_WRAP, SI470X_SEEK_UP);
        break;
      case 's':
        rx.seek(SI470X_SEEK_WRAP, SI470X_SEEK_DOWN);
        break;
      case '?':
        showHelp();
        break;
      default:
        break;
    }
    showStatus();
  }
  delay(5);
}

I tried to figure out how RDS works but this is far over my Understanding. Can someone please help me ?

2

Nobody has tried this yet ?

3

No experience

page 26 => RDS enable bit think it must be turned on.
page 34-37 == RDS registers

And a reference to

that tells how to interpret RDS data.

Should help you to see if the library fetches the right bits.

4

The RDS enable bit is set because I get Informations like Station Name, etc. but sadly no Time.
I have a RSSI of 47. This seems to be enough to get Station Name, etc. but I'm not sure if this is enough to get the Time. I can't find any Information about that.

5

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