Change Assembly to Arduino IDE

[westfw]

@Delta_G

What's the diff between PORTB and PORTL?

Whether they are in the (quite limited) address space accessible by the sbi/cbi instructions...

[noiasca]

@aless81

Another question, Led is on 13, which would be more correct

#define led 13

or

int led = 13;

use

constexpr uint8_t led {13};

[ptillisch]

@aless81

I would like to know how I can join the Arduino IDE language with the Assembly

From reading the rest of your posts, it seems that maybe you weren't interested in assembly language after all, but in case you are interested, or in case others who are interested find this thread, I will add that, in addition to the option of using inline assembly in your .ino files via the asm keyword as jim-p already mentioned, you can also add pure assembly files to your sketch.

There is a simple "hello world" demonstration of that here:

Progrsmming arduino with assembly

You don't need to use inline, you can add standard assembly files (using the .S file extension) to your sketch in Arduino IDE. Here's something I just cobbled together. It's the only time I've messed with assembly so I'm sure there's a better way to do this but it does work: blink.ino: extern "C" { // function prototypes void start(); void blink(); } void setup() { start(); } void loop() { blink(); } blink.S: ; Blink LED on PB5(Arduino Uno pin 13) ; http://forum.arduino.cc/index…

[noiasca]

@Delta_G

Is there any specific advantage in the case of a single number to using constexpr over just const int?

the value will be evaluated during compile time, whereof in case of a const uint8_t you rely on the optimization of the compiler. So there might be edge cases where the compiler optimization of a const variable could fail and end up in RAM, but constexpr variables will be inserted as literals (otherwise it will not compile).

I'm not good in such things, better read:
https://en.cppreference.com/w/cpp/language/constexpr