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CC2640R2L: Count pulses

Part Number: CC2640R2L

Hi. how to count a given number of external pulses with the formation of an interrupt upon completion of the count? With the possibility of battery operation. The frequency of the external pulse signal is 300 kHz.
Using GPTimer during pulse counting puts the core into active mode, the current consumption rises to 4 mA. Using a pin interrupt to detect the edge of a pulse and count such events does not work when using TI-RTOS due to the high frequency of the input signal. Cc2640r2l