Simulator: Printf not working at runtime | Simulator starts twice

[MasterTim17]

Hello,
im using the simulator with platformio and used this repo example.
When i upload the project the simulator starts. When i close it another windows opens. This is essential for the following problem

I want to debug the code with printf command. So i defined following in platform.ini file:

-D LV_USE_LOG=1
-D LV_LOG_PRINTF=1

Default log level is : -D LV_LOG_LEVEL=LV_LOG_LEVEL_WARN
During runtime i dont get an output. When i close the Simulator window, the print output is now seen on the output. The second windows open, but the print output from it is not seen after closing.

However, when i change the log level to -D LV_LOG_LEVEL=LV_LOG_LEVEL_INFO the print output can now be seen during runtime. thi s isnt useful, because too much output is beeing listed.

I hope the problem is understandable. Is this a bug or is there a solution?

[3254547566]

I am also facing the same problem. Is there a solution now

[Yutu0k]

Still waiting for a solution...

[kisvegabor]

Hi,

How do you print the logs? With lv_log() you need to append a "\n". E.g. lv_log("Hello %d world\n", 5). LV_LOG_USER("Hello %d world", 5) append the \n internally.

Recently fflush was added to printf logging. See here. Does it solve the problem?

[Yutu0k]

I think LV_LOG_USER("Hello world\n") works.
If I add std::cout and endl func in the code to flush the output, it also seems to work.

[kisvegabor]

Does it mean the problem is solved? 🙂