New to SAMD21 - is there no Serial.printf?

[beegee-tokyo]

Maybe it's just me, but on other architectures I am have no problems using printf like

Serial.printf("\nLoRa begin failed %d\n", state);

But for SAMD21 it throws compile error

src\main.cpp:78:10: error: 'class Uart' has no member named 'printf'; did you mean 'print'?
   Serial.printf("\nLoRa begin failed %d\n\n", state);

Am I missing something

[matthijskooijman]

No official architecture supports Serial.printf AFAIK (intentionally, there are some discussions on the mailing list and github about this). There might be third-party libraries that make it work, maybe you have some such library installed for other archs? Or maybe you are comparing with third-party architectures?

[beegee-tokyo]

With other architectures I meant ESP32 Arduino, ESP8266 Arduino, nRF52 Arduino frameworks.
Also printf is standard C++ http://www.cplusplus.com/reference/cstdio/printf/

Surprised it is not on SAMD

[beegee-tokyo]

Example. on ESP32 it is in Print.cpp

size_t Print::printf(const char * format, ...)
{
  char buf[256];
  int len;

  va_list ap;
  va_start(ap, format);

  len = vsnprintf(buf, 256, format, ap);
  this->write(buf, len);

  va_end(ap);
  return len;
}```

Wondering if that would work on SAMD

[beegee-tokyo]

I see, that it is not in ArduinoAVR framework. Maybe I was just lucky with the platforms I used before.

[matthijskooijman]

Yeah, those are third-party platforms that have made this custom addition. It is not part of the official Arduino API, for reasons previously stated elsewhere. See also arduino/ArduinoCore-API#34.