This function can be optimized further by writing it in proper assembler code. Compared with solution using String object which compiled into 2,398 bytes, this implementation can reduce your code size by 1.2 Kb (assumed that you need no other String's object method, and your number is strict to signed int type). This sketch is compiled to 1,082 bytes of code using avr-gcc which bundled with Arduino v1.0.5 (size of int2str function itself is 594 bytes).
#Arduino println int string serial
Without Serial.available (), everything works fine. 3 Answers Sorted by: 3 If you're just outputting to serial you don't need to concatenate - just print each bit separately, such as: Serial.print (out1) Serial.print (',') Serial.print (out2) Serial.print (',') Serial.println (out3) You should avoid using String as it's not good on devices with small amounts of memory like Arduinos.
The exception occurs when the loop () function is running. I'm using PlatformIO with VS Code for my development. To assist compiler, we add register modifier into variable declaration to speed-up execution. ESP8266 - Exception 9 when adding Serial.available () I'm encountering an exception (9) when I include Serial.available () in my Arduino code. Since it's only 7 bytes, the cost of fixed RAM usage is considered minimum. Thus the fastest solution is using conditional branches to build the string.Ī fixed 7 bytes buffer prepared from beginning in RAM to avoid dynamic allocation. Syntax Serial.println (val) Serial.println (val, format) Parameters Serial: serial port object. This command takes the same forms as Serial.print (). This implementation avoids using division since 8-bit AVR used for Arduino has no hardware DIV instruction, the compiler translate division into time-consuming repetitive subtractions. Description Prints data to the serial port as human-readable ASCII text followed by a carriage return character (ASCII 13, or '\r') and a newline character (ASCII 10, or ' ').
This is speed-optimized solution for converting int (signed 16-bit integer) into string.
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