upd

README.md

@@ -8,12 +8,7 @@
  F_CPU=16000000UL
  portUSE_TIMER0
 
- I rewrite defenition of configCPU_CLOCK_HZ at FreeRTOSConfig.h. Now if there is F_CPU so configCPU_CLOCK_HZ = F_CPU Just see
-#if !defined(F_CPU)
-#define configCPU_CLOCK_HZ			( ( unsigned long ) 16000000 )
-#else
-#define configCPU_CLOCK_HZ			( F_CPU )
-#endif
+ I rewrite defenition of configCPU_CLOCK_HZ at FreeRTOSConfig.h. Now if there is F_CPU so configCPU_CLOCK_HZ = F_CPU Just see https://github.com/AndreiCherniaev/FreeRTOS_ATmega2560_MPLAB/issues/1#issue-1273680060
 
  If you want to use Arduino bootloader so you can. Produce .hex file via MPLAB X and flash it  to ATmega using avrdude https://github.com/avrdudes/avrdude into console. Example