Hi guys, I'm using a code and I decided to see how much memory is needed for my project, so I checked my code with Arduino Uno and Arduino Leonardo (328p x 32u4 atmel) but in Leonardo the memory needed is too different compared to Uno, even though both have the same memory size, so my question is: why?
uno:
Leonardo:
Im using the code from this site: Como usar com Arduino - Sensor de Pressão e Temperatura BMP180 - BLOG MASTERWALKER SHOP
thanks. Now I understand.
The Leonardo's connection to the PC is done from the microcontroller while the Uno's connection uses a simple UART that is connected to a serial-to-usb converter (16U2/CH340/...).
The 32U4 contains additional code for the USB connection (board identification, reaction on reset for upload) while that functionality on the 328P (Uno) is provided by the serial-to-usb converter.
It is actually the same core but the added functionality costs program memory. What is interesting (I've noticed it before) is that the Leonardo uses less RAM; I've never looked into the "why".
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