tg_set_gsl_params
struct timing_generator *tg = params->tg_set_gsl_params.tg;
struct gsl_params *gsl = ¶ms->tg_set_gsl_params.gsl;
seq_state->steps[*seq_state->num_steps].params.tg_set_gsl_params.tg = tg;
seq_state->steps[*seq_state->num_steps].params.tg_set_gsl_params.gsl = gsl;
struct tg_set_gsl_params tg_set_gsl_params;