Ok, I see now, TI-RTOS. When I used FreeRTOS (project generated by TI HalCoGen) the solution was to add printf support in compiler options (Project properties -> CCS Build -> ARM Compiler -> --printf_support=minimal). Using RTOS, this option was disabled by default. Unfortunely, in my case only 'minimal' option could be turned on. It is limited to text. [You can read about details in your Compiler Technical Ref Manual]. Now I can use printf but debugging LwIP is limited to letters/text (it is impossible to make number conversion).
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