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Minimal Makefile

(5 posts) (3 voices)

Started 3 years ago by mh555
Latest reply from mbolivar

mh555
Member

Hi!

When it comes to microcontrollers, I am a kind of "control freak". I don't like hundreds of things working simultaneously without me knowing. I was horrified to see how much gets compiled for a simple blinking of a LED, resulting in a codesize of more than 14 kB!

I want to start with the bare metal and then add a few things, but only those that I need and understand.

Unfortunately, I have almost no experiences with setting up toolchains, so I was not successful with modifying the supplied Makefile to get rid of all libmaple and wiring and still keep the linker happy.

Could anyone help me here with a minimal Makefile?

Posted 3 years ago #
robodude666
Member
Hey,

If you open up the Makefile, you'll see this section:
```
# Official libraries:
LIBMAPLE_MODULES += $(SRCROOT)/libraries/Servo
LIBMAPLE_MODULES += $(SRCROOT)/libraries/LiquidCrystal
LIBMAPLE_MODULES += $(SRCROOT)/libraries/Wire
# Experimental libraries:
LIBMAPLE_MODULES += $(SRCROOT)/libraries/FreeRTOS
```
This includes some of the libraries, which you probably don't need. You can comment them out, by placing a # in front of each line you don't want included. For example, to not compile the FreeRTOS library:
```
# Official libraries:
LIBMAPLE_MODULES += $(SRCROOT)/libraries/Servo
LIBMAPLE_MODULES += $(SRCROOT)/libraries/LiquidCrystal
LIBMAPLE_MODULES += $(SRCROOT)/libraries/Wire
# Experimental libraries:
#LIBMAPLE_MODULES += $(SRCROOT)/libraries/FreeRTOS
```
Right above that there's also:
```
LIBMAPLE_MODULES += $(SRCROOT)/wirish
```
Which includes all of the C++ wirish support. You can elect to not include it if you only plan to use libmaple.

That's about it... You can remove libmaple if you want, but then why are you using libmaple to begin with?

-robodude666
Posted 3 years ago #
mh555
Member

Thanks, I already found that. If I want to remove libmaple as well, I first need a add an "mkdir build" in the Makefile. And after that, I get an "undefined symbol `_start'" error from the linker that I cannot resolve.

Could you help me on that? Or suggest another Maple-compatible toolchain?

As to the question why I started with libmaple, you have to know that my expectation of what a device library should be, is heavily influenced by avr-libc. Take interrupts, for example. avr-libc gives me easy macros and a well-written documentation on how to create my own interrupt handlers. libmaple, on the other side, "secretly" implements a few interrupt handlers just in case somebody might need a millis() function. I am happy to cherry-pick some parts of libmaple, but I don't want a good part of my processor/memory busy without me knowing.

Posted 3 years ago #
robodude666
Member

Read through all of the documentation, and you'll be aware of it.

libmaple and wirish is no different to the LeafLabs boards as Wiring and the Arduino stuff is to Arduino. Both platforms have timers used for millis, etc. It's nothing unknown.

If you're going to avr-libc to libmaple, and have no previous experience with Arduino then maybe some of the things libmaple does by default will come as a surprise.. But here are pretty good docs.

Posted 3 years ago #
mbolivar
LeafLabs

I don't want a good part of my processor/memory busy without me knowing.

Then don't call init(), or just replicate the pieces you want.

Posted 3 years ago #

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