diff --git a/Core/Src/pdu.c b/Core/Src/pdu.c
index 33a0cf4..22f26f8 100644
--- a/Core/Src/pdu.c
+++ b/Core/Src/pdu.c
@@ -19,6 +19,30 @@
 
 static osMutexAttr_t pdu_mutex_attributes;
 
+//hi2c2 variable to pass to the function wrappers
+extern I2C_HandleTypeDef hi2c2;
+
+//Function wrapper for the STM specific HAL write function
+//Serves as function pointer for PCA PAL
+static inline int pca_i2c_write(uint16_t dev_addr, uint16_t address,
+				uint16_t mem_add_size, uint8_t *data,
+				uint16_t size, int delay)
+
+{
+	return HAL_I2C_Mem_Write(&hi2c2, dev_addr, address, mem_add_size, data,
+				 size, delay);
+}
+
+//Function wrapper for the STM specific HAL read function
+//Serves as function pointer for PCA PAL
+static inline int pca_i2c_read(uint16_t dev_addr, uint16_t address,
+			       uint16_t mem_add_size, uint8_t *data,
+			       uint16_t size, int delay)
+{
+	return HAL_I2C_Mem_Write(&hi2c2, dev_addr, address, mem_add_size, data,
+				 size, delay);
+}
+
 static uint8_t sound_rtds(pdu_t *pdu)
 {
 	if (!pdu)
@@ -129,7 +153,10 @@ pdu_t *init_pdu(I2C_HandleTypeDef *hi2c)
 	/* Initialize Control GPIO Expander */
 	pdu->ctrl_expander = malloc(sizeof(pca9539_t));
 	assert(pdu->ctrl_expander);
-	pca9539_init(pdu->ctrl_expander, pdu->hi2c, CTRL_ADDR);
+
+	//NEED
+	pca9539_init(pdu->ctrl_expander, pca_i2c_write, pca_i2c_read,
+		     CTRL_ADDR);
 
 	// write everything OFF, FAULT 1 is off
 	uint8_t buf = 0b00000010;
diff --git a/Drivers/Embedded-Base b/Drivers/Embedded-Base
index 970cceb..3bb4e77 160000
--- a/Drivers/Embedded-Base
+++ b/Drivers/Embedded-Base
@@ -1 +1 @@
-Subproject commit 970cceb6d6589c23d21ff6e3d2c29696973902ff
+Subproject commit 3bb4e772c7f8dabb728d40da849ac2d661df4ce8