[Solved] PX4 cannot open logger_topics.txt

1

Hello. I try to log some uORB topict to SD card. When I insert card to slot, and turn on, microSD checks with OK. PARAMS, DATAMAN and LOG-directory are created well. Also, I create etc/logging/logger_topics.txt file. But logger dont create any ULOG file. I discovered code and saw, that hardware even cannot open file: (inside this)
int ntopics = add_topics_from_file(PX4_STORAGEDIR "/etc/logging/logger_topics.txt");

And:
fp = fopen(fname, "r"); returns with error. Platform simply cannot open file and get needed topics. ULOG file dont created too. But PARAM, DATAMAN and LOG dir was created with OK
Any ideas??
Thanks

2

Usually you need to arm and disarm to create a log, unless you change this param to what you need:
https://dev.px4.io/en/advanced/parameter_reference.html#SDLOG_MODE

3

Thanks. LOG file created correctly, but main issue still not resolved. Program cannot found file

etc/logging/logger_topics.txt
Inside function int Logger::add_topics_from_file(const char *fname)
. fopen-function returns fail. ‘Cannot open file’
But this file exists. I also experimented with custom file in root directory. And… I also cannot open it. That is very strange

4

I suspect the path is wrong, can you output exactly what the path is and can you check in nsh> using ls if this path actually exists?

5

Yes. It seems that path is invalid. In User Guide i read that I need etc/logging/logger_topics.txt.
But with ls I see next
nsh> ls
/fs:
microsd/
nsh> cd microsd
nsh> ls
/fs/microsd:
DATAMAN
PARAMS
LOG/
ETC/
FTEST.TXT
nsh> cd etc
nsh> ls
/fs/microsd/etc:
LOGGING/
nsh> cd logging
nsh> ls
/fs/microsd/etc/logging:
LOGGER~1.TXT

As I understood, driver get path default in fs/microsd - path. But in /fs/microsd/etc/logging: I suddenly see LOGGER~1.TXT (not logger_topics.txt, that I created on SD).
Is it right?

6

Can you try to rename that file? And is your SD card correctly FAT32 formatted?

7

Thanks! I changed
add_topics_from_file(PX4_STORAGEDIR "/etc/logging/logger_topics.txt");
to
add_topics_from_file(PX4_STORAGEDIR "/etc/logging/logger~1.txt");
and now it works fine.
But it’s strange, as guide says to create logger_topics.txt. I cannot suggest why this file looks with another name (logger~1.txt instead logger_topics.txt)

8

It would work on an a decent operating system which does not truncate filenames like this :smile:.

Thanks for sharing, glad you got it to work.