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If you can find a suitable stepper-driver IC the datasheet should make clear which signals have to be provided by the micro.How do I do this with a stepper?
Aren't those disabled when the pins are configured as outputs? Even if they aren't they may have too high a resistance to provide sufficient base current for the darlingtons used to drive the stepper coils; hence the hex buffer is advisable.All Ports on the AVR Atmega 16 have internal pullup resistors.