C++
General
Basic Variable Types
Number Types
C and C++ : char, int, long, unsigned long Arduino : byte, word inttypes : int8_t, int16_t, int32_t; uint8_t, uint16_t, uint32_t
preferable use inttypes!
inttype : Arduino / C/C++ uint8_t : byte uint16_t : unsigned int uint32_t : unsigned long
float
int to float
float f = float(i);
array
initialize all array values with 0
unsigned int barchart_data[128]; barchart_data[128] = {0};
shift array to left
for (unsigned int i = 0; i < px_x - 1; i++) { // ends at px_x - 2 barchart_data[i] = barchart_data[i + 1]; }
length of array
sizeof(data) / sizeof(data[0])
Pre Compiler Defines
Using pre compiler defines it can be chosen which part of the sources are actually imported and compiled
#define TM_LOAD_DEVICE_OLED_128X32 1 ... #if TM_LOAD_DEVICE_OLED_128X32 == 1 #include "TM_OLED_128x32_Class.h" auto my_oled = TM_OLED_128x32_Class(); #endif