How tor create a Makefile for linux port

Kernel
1

Hi all,
I’m new to freertos forum and learning rtos. Long story somewhat shortened: I tried poking around on the TI website using TI-RTOS. But their document isn’t exactly for the newbie. But then I stumbled upon freertos and it’s opened up a whole new world! I’m really enjoying Richard Barry’s Tutorial Guide. It’s very informative, interesting, and easy to follow. I’ve been able to run a demo on my TI arm-based board (MSP432P4).

I would also like to run the Windows port, but my eyes glazed over at “download Visual Studio”. But hope sprung anew when I saw the MinGW port. Alas, again dashed, to a lesser extent - when I realized it’s really just another Windows port wrapped inside Eclipse. So I tried in vain running Eclpise to trying to create a Makefile from an existing project. Not much luck.

What I’d really like is a plain old Makefile so I can just run ‘make’ on the command line…either in UNIX (GNU-Linux) or cygwin…but, importantly, without any Windows dependencies like a cmd window widget thing.

So, to my questions: given my aversion to Windows, what do you think is the quickest path to running a linux-y purely command line port? Perhaps to modify a GCC make file from another port? Maybe export a makefile from Eclipse?

Thanks for the help…and for the great software,
Scott

2

LOL I think I just found my answer.
https://www.freertos.org/FreeRTOS-simulator-for-Linux.html.
I’m getting some compiler errors but maybe that’s another post:
PosixMessageQueueIPC.c:(.text+0x38): undefined reference to `mq_open’

-Scott

3

Hi Scott,

Thank you for your interest in FreeRTOS, i am sure you will enjoy it!

we actually do have a new linux port with networking supported, unfortunately the documentation is not quite there, it is on the way though.

you will need scons to build it, and a proper makefile is on the way as well

you can find the kernel port here: https://github.com/FreeRTOS/FreeRTOS-Kernel/tree/master/portable/ThirdParty/GCC/Posix

And the Demo here:

Hope this helps!

Alfred

4

The Networking port here:

5

Thanks for your help. I downloaded the posix port but having some compile issues:
#include <pcap/bpf.h>
^~~~~~~~~~~~

I tried adding a couple paths to src/SConscript but no luck, for example:
“FreeRTOS/Demo/Common/ethernet/lwip-1.4.0/ports/win32/WinPCap/pcap/”,
“FreeRTOS-Plus/Demo/FreeRTOS_Plus_TCP_Minimal_Windows_Simulator/WinPCap/pcap/”,

I think I probably have to understand the code and dir structure better.

Otherwise I did get William Davy’s Posix port to work. I ran into the classic “gcc options ordering issue” where you have to put the -l library option after other options so it can correctly compile-and-link:

gcc -lrt [options] //error!
gcc [options] -lrt //OK

If you have any suggestions on getting the posix kernal going let me know.
thanks!
Scott

6

At the risk of making you regret giving me your latest code, can you help me debug this: I was getting a linker error because I was unable to link pcap library. So I installed the pcap library (sudo apt install libpcap-dev).

So then I was able to compile, but I’m now getting a application error:

The following network interfaces are available:

Interface 1 - enp3s0
              (No description)

Interface 2 - wlp2s0
              (No description)

Interface 3 - any
              (Pseudo-device that captures on all interfaces)

etc,

The interface that will be opened is set by 
"configNETWORK_INTERFACE_TO_USE", which
should be defined in FreeRTOSConfig.h
Attempting to open interface number 1.
opening interface enp3s0
setting device modes of operation...
pcap activate error socket: Operation not permitted
Failed to open interface number 1.
application iddle hook network down

Maybe I have the wrong pcap library? Anyway, why do I need a network connection since I’m running it locally?

thank you,
Scott