Reduce Sketch Size

Projects Programming
1

Sketch using BME280 sensor and ILI9341 TFT

The Attached sketch compiles to 31230k and works ok on a "Real" Uno.
Compile for Clone Pro 3 volt mini the sketch is to big by 1016K.
Some pointers to reduce its size would be great.

cheers
Peter

TFT_2_4___T_H_P copy.ino (8.65 KB)

2

pretty heavy library as it is not that much code.

  1. you should look for (almost)duplicate code and capture it in a function.

sin((i - 90) * 0.0174532925);
cos((i - 90) * 0.0174532925);
cos((i + seg - 90) * 0.0174532925);
...

can all be calls to

float sineWave(int phase)
{
return sin(phase * 0.0174532925);
}

float cosWave(int phase)
{
return cos(phase * 0.0174532925);
}

  1. replacing float math with integer math helps a bit

int x2 = sx2 * (r - w) + x;

==>

int x2 = int(sx2 * (r - w) ) + x;

replace int by byte where possible

3

thanks Rob, will give it a try.

4

Some more options:
Rebootload the Promini as an Uno, get some of the bootloader space back.
Download using a Programmer via the ICSP pins, ditch the bootloader and get that space back.

Code mentions supporting both SPI & I2C for the LCD. Why not clean out the one you're Not using?

5

You could install the optiboot bootloader on you clone Arduino Pro Mini. That would give you the same memory space as the UNO.

uint32_t runTime = -99999;       // time for next update

Probably shouldn't store a negative number in an unsigned integer.

  mySensor.settings.commInterface = SPI_MODE;
  mySensor.settings.I2CAddress = 0x76;

You can probably get rid of one of these lines.

  (mySensor.begin(), HEX);

You don't need the HEX part of this comma expression. "mySensor.begin();" does the same thing.

6

The Attached sketch compiles to 31230k

Yeah. Right.