ChibiOS Free Embedded RTOS

Hi

I'm playing around with a C++ project based on the STM32F4-DISCOVERY-G++ example.

I want to integrate the CMSIS DSP Library to play around with realtime processing of some sort. I've downloaded it from arm.com (Version 3.01) and am attempting to use it. I have added CMSIS/Include to my UINCDIR and CMSIS/Lib/GCC to ULIBDIR. I've linked with -larm_cortexM4lf_math (although I've also tried the one in CMSIS/Lib/G++ with no luck).

The project at the moment is not much more than a glorified blinky (single blinker thread flashing LED4).

What seems to happen, even if I do not call any functions from the library, is after flashing (I use the texane stlink utilities), the program runs; sometimes flashing the LED, sometimes crashes. When I attempt to hook gdb up, it's usually off in la-la land:



Oddly, I cannot even reset the board, it usually requires re-flashing it. Sometimes I can re-flash and get it to stop on a break point, but it usually ends up in a weird state after single-stepping a few times. I've also seen it end up in unhandled_exception() handler, and also __gnu_unwind_execute() with no returning.

I've enabled all DBG options in chconf.h to no avail. I've tried increasing the stack (I noticed several large global static arrays[] in the CMSIS code, but un-sure if that requires stack space?)

What else can I try? I find it odd that the board cannot even be reset by gdb.

All goes away if I do not link to CMSIS library.

Does the library call C runtime functions like allocation or similar? if so you have to provide the syscall module for newlib.

Giovanni

Is there a command to programmatically grab all of the syscalls from a .a archive?

On first glance, I can see the CMSIS library calls memset, and sqrtf at least. How does one provide the syscall module?

Thanks
Dave

There is one syscall module under ./os/various but it could not be compatible with your compiler/library setup. You need to read the newlib documentation.

Anyway, it is not sure that is the problem unless there is memory allocation involved.

Giovanni

Did you compile the lib yourself or use a binary ?

Giovanni wrote:There is one syscall module under ./os/various but it could not be compatible with your compiler/library setup. You need to read the newlib documentation.

Anyway, it is not sure that is the problem unless there is memory allocation involved.

Giovanni

Hmm, the only outside functions I see after invoking nm are:

__aeabi_d2f
__aeabi_d2iz
__aeabi_dadd
__aeabi_ddiv
__aeabi_dmul
__aeabi_f2d
__aeabi_f2lz
__aeabi_ldivmod
__aeabi_ui2d
memset
sqrtf

How can I proceed debugging this? I can attempt to boil it down to the simplest main.cpp and Makefile.

mobyfab wrote:Did you compile the lib yourself or use a binary ?

I have tried linking to both these libraries from CMSIS 3.01:

CMSIS/Lib/GCC/libarm_cortexM4lf_math.a
CMSIS/Lib/G++/libarm_cortexM4lf_math.a

I have also attempted to add the relevant .c sources to my project and compiling them in. Finally, I found this project https://github.com/fpoussin/ChibiOS-Examples/tree/master/STM32F4-LCD-DSP and used the static library that it ships with. None of the above worked.

Isn't there somewhere a dedicated forum? apparently this is not related to integration with ChibiOS, it is a more general problem.

Giovanni

dflogeras wrote:

mobyfab wrote:Did you compile the lib yourself or use a binary ?

I have tried linking to both these libraries from CMSIS 3.01:

CMSIS/Lib/GCC/libarm_cortexM4lf_math.a
CMSIS/Lib/G++/libarm_cortexM4lf_math.a

I have also attempted to add the relevant .c sources to my project and compiling them in. Finally, I found this project https://github.com/fpoussin/ChibiOS-Examples/tree/master/STM32F4-LCD-DSP and used the static library that it ships with. None of the above worked.

This is one of my "old" projects.

Give this one a try:
https://github.com/fpoussin/MotoLink/tr ... pp/dsp_lib

You should try to build it yourself as you might use a different compiler from mine. (just run make distclean, then make)
It solves some of the conflicts with ChibiOS's arm math headers.

Thanks Fabien, that helps a lot!