MCUXpresso SDK API Reference Manual  Rev. 0
NXP Semiconductors
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xTaskGetTickCountFromISR

task. h 

TickType_t xTaskGetTickCountFromISR( void );
Returns
The count of ticks since vTaskStartScheduler was called.

This is a version of xTaskGetTickCount() that is safe to be called from an ISR - provided that TickType_t is the natural word size of the microcontroller being used or interrupt nesting is either not supported or not being used.