IDE on Raspberry gives compile errors

Development Tools IDE 1.x
1

I try to compile the following program voor running on a NANO on a IDE running on a Raspberry PI4.
It gives errors while compiling.
When Compiling on a IDE on a LINUX MINT all is ok.

void setup()
{
Serial.begin(9600);
}

void loop()
{
String outString;
float p = 12.23;
float q = 56.78;
outString = 'BS' + String(p) + 'S' + String(q) + 'S';
Serial.println(outString);

Version IDE on Mint is 1.8.19
Version in Raspberry is: 2.1.0.5 + dfsg -4.1

2

Do we need to guess the error?

3

Do you actually have those single quotes in the code?

Should be double quotes for anything more than a single character. If you set preferences to show all compiler warnings you will see that in both versions of the IDE.

4

The OPs code also has no closing brace on the loop!

5

I made the source a bit more simple.
This still gives the error with the PI IDE.

void setup()
{
Serial.begin(9600);
}

void loop()
{
String outString;
float p = 12.34;

outString = "BS" + String(p);

Serial.println(outString);

}

6

The error:

sketch_oct21a.ino: In function ‘void loop()’:
sketch_oct21a.ino:11:32: error: call of overloaded ‘String(float&)’ is ambiguous
In file included from /usr/share/arduino/hardware/arduino/cores/arduino/Arduino.h:192:0,
from sketch_oct21a.ino:1:
/usr/share/arduino/hardware/arduino/cores/arduino/WString.h:70:11: note: candidate: String::String(long unsigned int, unsigned char)
explicit String(unsigned long, unsigned char base=10);
^
/usr/share/arduino/hardware/arduino/cores/arduino/WString.h:69:11: note: candidate: String::String(long int, unsigned char)
explicit String(long, unsigned char base=10);
^
/usr/share/arduino/hardware/arduino/cores/arduino/WString.h:68:11: note: candidate: String::String(unsigned int, unsigned char)
explicit String(unsigned int, unsigned char base=10);
^
/usr/share/arduino/hardware/arduino/cores/arduino/WString.h:67:11: note: candidate: String::String(int, unsigned char)
explicit String(int, unsigned char base=10);
^
/usr/share/arduino/hardware/arduino/cores/arduino/WString.h:66:11: note: candidate: String::String(unsigned char, unsigned char)
explicit String(unsigned char, unsigned char base=10);
^
/usr/share/arduino/hardware/arduino/cores/arduino/WString.h:65:11: note: candidate: String::String(char)
explicit String(char c);
^
/usr/share/arduino/hardware/arduino/cores/arduino/WString.h:60:2: note: candidate: String::String(const String&)
String(const String &str);
^

7

As far I know, that version is antique and therefore the WString implementation might not support floats; the list of candidates seems to indicate that.

I don't know if the Linux version on https://www.arduino.cc/en/software will work on the Pi. If not, a solution might be to copy WString.h and WString.cpp from your Mint system to the Pi (replacing the originals); make backups if needed.

8

Unfortunately, official builds of Arduino IDE 2.x for Linux ARM hosts are not yet available.

However, the one you get from the "Linux ARM" download links (I believe the RPi 4 is usually running a 64 bit operating system, in which case use that link instead of the "32 bits" one) under the "Legacy IDE (1.8.X)" section lower down on the Software page will work:

https://www.arduino.cc/en/software#legacy-ide-18x

1.8.19 is a big step up from "2.1.0.5 + dfsg -4.1" (which is a slightly modified version of Arduino IDE 1.0.5 from 2013).

9

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