By dave | November 15, 2022

Arduino text utilities in IoAbstraction

IoAbstraction comes with a few text utilities that can be helpful when rendering text as raw character arrays. Internally, IoAbstraction and TcMenu DO NOT use any string objects to avoid runtime memory allocation. See the complete text utility documentation

To use the text utilities you need to include the header

#include "TextUtilities.h"

Often times, we need to build text up within a buffer, so it is useful to have a series of functions that can work on a buffer, appending to the end of the buffer. These functions are described here:

void appendChar(char* buffer, char valueToAppend, int bufferLen);

To write a numeric into the first position in a buffer

void ltoaClrBuff(char* buffer, long val, uint8_t dp, char padChar, int bufferLen);

As above but start at the zero terminated end of the buffer. Where you provide a buffer and length, the value to convert, the maximum number of decimal places, and the padding char for zero padding ‘0’ or NOT_PADDED.

void fastltoa(char* str, long val, uint8_t dp, char padChar, int len);

As above but start at the zero terminated end of the buffer, instead of decimal placees, provide the largest power of 10 directy, EG 10, 100, 1000 etc.

void fastltoa_mv(char* buffer, long val, long divisor, char padChar, int bufferLen);

This works for floating point values, providing a number of decimal places

void fastftoa(char* sz, float fl, int dp, int strSize);

There is also a standardized abs function that works on most boards:

float absVal = tcFltAbs(floatVal);

See the complete documentation

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