gpi_send_cmd
ret = gpi_send_cmd(gpii, gchan, gpi_cmd);
ret = gpi_send_cmd(gpii, gchan, GPI_CH_CMD_START);
ret = gpi_send_cmd(gpii, gchan, GPI_CH_CMD_STOP);
ret = gpi_send_cmd(gpii, chan, GPI_CH_CMD_ALLOCATE);
ret = gpi_send_cmd(gpii, NULL, GPI_EV_CMD_ALLOCATE);
ret = gpi_send_cmd(gpii, &gpii->gchan[i], GPI_CH_CMD_START);
gpi_send_cmd(gpii, gchan, GPI_CH_CMD_RESET);
ret = gpi_send_cmd(gpii, gchan, GPI_CH_CMD_RESET);
gpi_send_cmd(gpii, NULL, GPI_EV_CMD_DEALLOC);