qmk_firmware/keyboards/lets_split_eh/eh/eh.c

#include "lets_split_eh.h"

void matrix_init_kb(void) {

    // JTAG disable for PORT F. write JTD bit twice within four cycles.
    MCUCR |= (1<<JTD);
    MCUCR |= (1<<JTD);
	
	// Undo init of RX LED, we use that port currently
	// DDRB &= ~(1<<0);
	
	matrix_init_user();
};