ets_printf is used to dump debug messages out the comm port.
ets_printf is implemented using ets_io_vprintf(ets_putc, fmt, ap);
ets_io_vprintf is a rom function and ets_putc is a polling function that waits until there is room in the uart's TX FIFO and then pushes it out -- polling transmit.
Worst case - it should just slow your code down because it does nothing as it waits to output the debug message - not eat up stack space.
I instrumented malloc and free with ets_printf.
When this occurs, there is an exception generated that one of the task's stack has overflowed after a lot of malloc/free related debug messages were sent.
My question is can anyone tell me why the stack comes into play other than the call to ets_printf itself?
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