Since some time printf messages are not shown in the monitor window for my Raspberry (Pico W, Pico 2) projects any more. Some time ago this worked fine. Serial.print* works fine all the time.

Since I found no documentation to all the debug settings: Does any of the following settings do affect the usability of printf?

  Debug/Release on the Visual Studio Symbols
  Debug: (Serial/Arduino/Hardware/Off) on the Visual Studio Symbols
  vMicro Icon: Option 8 (Debug Port)
  vMicro Icon: Option 9 (Debug Level)

Which combinations of these settings should be used/not be used?

Is there a link to the documentation of all the various VisualMicro settings in Visual Studio?

Thanks
Richard

Yes, I have updated to the latest RP2040 board package - I used RP20040/RP2350 4.4.0, and after updating to 4.4.1 the problem remains.

I use

void show_gcc_version()
{
  Serial.println("Examples: Various ways to print the GCC Version ");
  Serial.print("1. Serial.println GCC Version: ");
  Serial.print(__GNUC__); Serial.print(".");
  Serial.print(__GNUC_MINOR__); Serial.print(".");
  Serial.println(__GNUC_PATCHLEVEL__);
  // the same with printf in the C way
  printf("2. Printf GCC Version: %d.%d.%d\n", __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__);
  // the same with std::cout, requires #include <iostream>
  // and a board with enough memory (see section 3.2.1.1)
#ifndef SMALL_MEMORY // A board with not enough memory for std::cout
  std::cout << "3. std::cout GCC Version: " << __GNUC__ << "." << __GNUC_MINOR__ << "." << __GNUC_PATCHLEVEL__ << std::endl;
#endif
  std::string vs = "std::string GCC Version: " +
    std::to_string(__GNUC__) +
    "." + std::to_string(__GNUC_MINOR__) +
    "." + std::to_string(__GNUC_PATCHLEVEL__);
  printf("%s\n", ("4. printf " + vs).c_str()); // printf in the C++ way
  Serial.println(("5. Serial.println " + vs).c_str());
  // 5. Serial.println accepts char* arguments, but not std::string
                                                     // arguments
  Serial.printf("6. Serial.printf %s\n", vs.c_str());
}
 

and get only (2., 3. and 4. are not shown in the monitor window)

Examples: Various ways to print the GCC Version
1. Serial.println GCC Version: 14.2.0
5. Serial.println std::string GCC Version: 14.2.0
6. Serial.printf std::string GCC Version: 14.2.0
 

Best
Richard

Hi Simon,

my reason to prefer std::printf over Serial.printf() is to use C++ standard library features in my lectures.

I have asked Earle Philhower in the meantime.

Thanks
Richard