SI70XX_READ_USER_REG_1
case SI70XX_READ_USER_REG_1:
error = si70xx_cmd1(sc, SI70XX_READ_USER_REG_1, &userregister, 1);
error = si70xx_cmd1(sc, SI70XX_READ_USER_REG_1, &userregister, 1);
error = si70xx_cmd1(sc, SI70XX_READ_USER_REG_1, &userregister, 1);
uint8_t reg = SI70XX_READ_USER_REG_1;