+/**
+ * Read PCF8574 \a pcf bit status.
+ * \return the pins status or EOF on errors.
+ */
+int pcf8574_get_2(I2c *i2c, Pcf8574 *pcf);
+
+/**
+ * Write to PCF8574 \a pcf port \a data.
+ * \return true if ok, false on errors.
+ */
+bool pcf8574_put_3(I2c *i2c, Pcf8574 *pcf, uint8_t data);
+
+/**
+ * Init a PCF8574 on the bus with addr \a addr.
+ * \return true if device is found, false otherwise.
+ */
+bool pcf8574_init_3(I2c *i2c, Pcf8574 *pcf, pcf8574_addr addr);
+