Arduino library for the integer24 data types uint24_t and int24_t.
The integer24 is an experimental library to implement support for the following two 24 bit data types:
- int24_t
- uint24_t
Version 0.1.0 implements a typedef for both types.
Note: AVR does support __uint24 and __int24 which uses only 3 bytes. This allows an UNO to have ~30% more elements (in theory) in an array with the same memory usage as an uint32_t array.
This library is only (limited) tested with AVR - UNO.
So use with care.
| platform | type | minimum | maximum | notes |
|---|---|---|---|---|
| AVR | uint24_t | 0 | 16777215 | __uint24 |
| AVR | int24_t | -8388608 | 8388607 | __int24 |
| other | uint24_t | 0 | 4294967296 | uint32_t for now |
| other | int24_t | -2147483648 | 2147483648 | int32_t for now |
Note the range for other platforms may change in the future to those matching AVR.
If other platforms are known to implement (3byte) int24 data types please let me know so I can add these.
- The AVR uint24_t and int24_t cannot be printed without casting.
- see integer24_explore_printing.ino
- Arduino-CI does not implement __int24 __uint24 so no tests can be done.
#include "integer24.h"- update documentation
- get hands on experience, especially AVR
- document what is learned.
- implement char * convert24(int24_t) and char * convert24(uint24_t)
- length = 8 + \0 = 9
- fprintf(buf, "%d", (uint32_t)val); ?
- char * itoa ( int value, char * str, int base );
- see integer24_explore_printing.ino
- implement a class for both types
- implement printTo()
- basic math, comparison, negation, ...
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