Operating system and interrupts¶
LittlevGL is not thread-safe by default.
However, in the following conditions it’s valid to call LittlevGL related functions:
Tasks and threads¶
If you need to use real tasks or threads, you need a mutex which should be invoked before the call of lv_task_handler and released after it.
Also, you have to use the same mutex in other tasks and threads around every LittlevGL (lv_...) related function calls and codes.
This way you can use LittlevGL in a real multitasking environment. Just make use of a mutex to avoid the concurrent calling of LittlevGL functions.
Interrupts¶
Try to avoid calling LittlevGL functions from the interrupts (except lv_tick_inc() and lv_disp_flush_ready()). But, if you need to do this you have to disable the interrupt which uses LittlevGL functions while lv_task_handler is running.
It’s a better approach to set a flag or some value and periodically check it in an lv_task.