err = i2c_write(GPPUA); if (err) goto out;
err = i2c_write(0b00000000); if (err) goto out;
err = i2c_write(0b00111111); if (err) goto out;
err = i2c_write(GPPUA); if (err) goto out;
err = i2c_write(0b00000000); if (err) goto out;
err = i2c_write(0b00111111); if (err) goto out;