ChibiOS Free Embedded RTOS

Posted: **Fri Jan 13, 2017 7:39 pm**

According to the documents, ChibiOS/Nil should not exceed 1KB at maximum configuration. However, when I try to compile the NIL-ARDUINOUNO demo:

Code: Select all

Size after:
AVR Memory Usage
----------------
Device: atmega328p

Program:    5278 bytes (16.1% Full)
(.text + .data + .bootloader)

Data:        555 bytes (27.1% Full)
(.data + .bss + .noinit)



-------- end --------

This doesn't look quite right, as the bare example alone takes up almost 6k. I tried changing compiler optimization, and it doesn't help a lot here. The make output indicates that the demo is correctly linked to NIL files, so it is not incorrectly linked to RT or something.

Or am I misunderstanding the claim about space? Does HAL take a large chunk of space too?

Posted: **Fri Jan 13, 2017 7:59 pm**

OK, after some investigation, it looks like that those 5K are actually taken by HAL. Enabling everything in Nil config simply adds a few hundred B to the final size, so I guess that is it.

Posted: **Fri Jan 13, 2017 8:51 pm**

Correct, NIL alone, the RTOS, is very small but HAL size varies depending the enabled drivers.

Giovanni

ChibiOS Free Embedded RTOS

AVR Nil demo takes up almost 6k?

AVR Nil demo takes up almost 6k?

Re: AVR Nil demo takes up almost 6k?

Re: AVR Nil demo takes up almost 6k?