main.cpp

    ff_effect const effect{
      FF_PERIODIC,
      effect_id,
      effect_direction,
      ff_trigger{
	0,
	0
      },
      ff_replay{
	1000,
	0
      },
      .u = { .periodic = {
	FF_SINE,
	100,
	0x7fff,
	0,
	0,
	ff_envelope{
	  1000,
	  0x7fff,
	  1000,
	  0x7fff
	},
	0,
	0
      }}
    };