This SafeString library is designed for beginners to be a safe, robust and debuggable replacement for string processing in Arduino and provides non-blocking text I/O and parsing and testing for Real World use.
This library includes:-
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SafeString, a safe, robust and debuggable replacement for string processing in Arduino
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SafeStringReader, a non-blocking tokenizing text reader replacement for Serial read()
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BufferedOutput, non-blocking replacement for Serial print()
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SafeStringStream, a stream to provide test inputs for repeated testing of I/O sketches
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BufferedInput, extra buffering for text input
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loopTimer, (loopTimerClass) to track of the maximum and average run times for the loop()
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millisDelay, a non-blocking delay replacement, with single-shot, repeating, restart and stop facilities.
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PinFlasher, a non-blocking flashing of an output pin.
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SerialComs, to send messages between Arduinos via Serial
To create SafeStrings use one of the four (4) macros createSafeString or cSF, createSafeStringFromCharArray or cSFA, createSafeStringFromCharPtr or cSFP, createSafeStringFromCharPtrWithSize or cSFPS
For example sketches see SafeString_ConstructorAndDebugging.ino, SafeStringFromCharArray.ino, SafeStringFromCharPtr.ino and SafeStringFromCharPtrWithSize.ino
and the SafeString Tutorial
See SafeString Documentation
See SafeString Tutorial
See Arduino to Arduino/PC via Serial
See Arduino Text I/O for the Real World
See Simple Multitasking Arduino
See How to code Timers and Delays in Arduino
See issue #73
Sparkfun's SAMD board support does not provide a define to distinguish it from Arduino's SAMD boards.
This causes SafeString compile to fail with
error: expected class-name before '{' token 73 | class SafeStringReader : public SafeString {
This fix is to remove the contents of these three header files
SafeStringNameSpace.h
SafeStringNameSpaceEnd.h
SafeStringNameSpaceStart.h
That is just have empty files for those three headers.
This library is primarily an Arduino IDE library, but users have had success using it with PlatformIO.
See the PlatformIO subdirectory for the two PlatformIO versions. One for boards that use the arduino namespace, e.g. Arduino Zero, and one for boards that don't, e.g. UNO.
To see which board yours is, check the Print.h file and see if it includes the lines
namespace arduino {
class Print
If it does, then unzip the SafeStringIO_namespace.zip and use that library. If it does not, then unzip the SafeStringIO.zip and use that library.
See the top of each file for its license
Note, this is NOT my work, I am simply hosting it for easy access. The original code belongs to Forward Computing and Control Pty. Ltd.
V4.1.34 fixed SafeStringLengthTrim example (removed unsupported setLength() calls)
V4.1.33 fix for bool for SAM boards
V4.1.32 added support for Adafruit SAMD boards
V4.1.31 added support for other Arduino MBED boards like Opta
V4.1.30 added default initializations
V4.1.29 removed F() macro and FlashStringHelper class from SafeString.h. SafeString now depends of the board's core to define these.
V4.1.28 fixes for Arduino UNO R4 and R4 WiFi
V4.1.27 revised defines for Arduino Zero
V4.1.26 fixed F()for Arduino IDE 2 and ESP32
V4.1.25 added NULL detection to readFrom(const char*, unsigned int maxCharsToRead)
V4.1.24 added NULL detection to readFrom(const char*)
V4.1.23 added readFrom(const char*)
V4.1.22 added link to docs in README.md
V4.1.21 minor change document correction
V4.1.20 fixed for ESP32 V2.0.3 dtostrf
V4.1.19 minor change to PinFlasher to support ESP32_WS2812Flasher extension
V4.1.18 changed firstToken() arguments now defaults to returning empty tokens
V4.1.17 restored firstToken() method
V4.1.16 minor text corrections, SafeStringReader.getDelimiter() now returns int, fix for SafeStringReader.flushInput()
V4.1.15 added support for ARDUINO_ARCH_NRF52 and ARDUINO_ARCH_NRF5
V4.1.14 minor fix PinFlasher
V4.1.13 minor change PinFlasher to simplify loop logic
V4.1.12 adds PinFlasher class
V4.1.11 adds support for Ardafruit M4 and Moteino M4
V4.1.10 fixed SafeStringStream to handle data >= 0x80
V4.1.9 added toUnsignedLong coversions, removed firstToken()
V4.1.7-8 added MegaTinyCore support
V4.1.6 added Teensy2 to Teensy4.1 support (dtostrf)
V4.1.5 SerialComs timeout 5sec, added firstToken()
V4.1.4 fixed dtostrf support
V4.1.3 added Arduino Due support
V4.1.2 fixed SerialComs when msg times out without delimiter, fixed support for Adafruit Feather nRF52 (V0.21.0)
V4.1.1 fixed nullpointer, check for Out-Of-Memory on createSafeString, support for Earl Philhower's pi pico board package
V4.1.0 added SerialComs class for Arduino to Arduino/PC via Serial, added fixed width formatting, print(value,decPlaces,width) see example SafeString_Tests/SafeString_fixedWidthFormat.ino
V4.0.5 added returnEmptyTokens() option to SafeStringReader
V4.0.4 adds support for Raspberry Pi Pico using Arduino Mbed OS RP2040 V2.0.0 board package ,nextToken() now returns last un-terminated token by default (can be overridded by optional arg), option to return empty tokens
V4.0.3 allow createSafeString for small sizes, fixed bool for DUE (ARDUINO_ARCH_SAM)
V4.0.2 added flushInput() method to SafeStringReader
V4.0.1 fixed SafeStringReader timeout and NanoBLE F() macro
V4.0.0 changes method returns to better match Arduino String methods, main change is indexOf now returns int and returns -1 if not found
V3.1.0 adds hasError() method
V3.0.6 adds support for Arduino megaAVR boards
V3.0.5 adds support for SparkFun Redboard Turbo,but may interfer with other SAM ZERO based boards, also adds support for Due and STM32F1 and STM32F4