diff --git a/keycluster/src/blackberry_trackball.c b/keycluster/src/blackberry_trackball.c
new file mode 100644
index 0000000..85d527d
--- /dev/null
+++ b/keycluster/src/blackberry_trackball.c
@@ -0,0 +1,19 @@
+#include "fsl_gpio.h"
+#include "fsl_port.h"
+#include "blackberry_trackball.h"
+
+pointer_delta_t BlackBerryTrackball_PointerDelta;
+
+void BlackberryTrackball_Init(void)
+{
+    CLOCK_EnableClock(BLACKBERRY_TRACKBALL_LEFT_CLOCK);
+    PORT_SetPinMux(BLACKBERRY_TRACKBALL_LEFT_PORT, BLACKBERRY_TRACKBALL_LEFT_PIN, kPORT_MuxAsGpio);
+    PORT_SetPinInterruptConfig(BLACKBERRY_TRACKBALL_LEFT_PORT, BLACKBERRY_TRACKBALL_LEFT_PIN, kPORT_InterruptEitherEdge);
+    NVIC_EnableIRQ(BLACKBERRY_TRACKBALL_LEFT_IRQ);
+}
+
+void BLACKBERRY_TRACKBALL_IRQ_HANDLER(void)
+{
+    GPIO_ClearPinsInterruptFlags(BLACKBERRY_TRACKBALL_LEFT_GPIO, 1U << BLACKBERRY_TRACKBALL_LEFT_PIN);
+    BlackBerryTrackball_PointerDelta.x++;
+}
diff --git a/keycluster/src/blackberry_trackball.h b/keycluster/src/blackberry_trackball.h
new file mode 100644
index 0000000..272d165
--- /dev/null
+++ b/keycluster/src/blackberry_trackball.h
@@ -0,0 +1,26 @@
+#ifndef __BLACKBERRY_TRACKBALL_H__
+#define __BLACKBERRY_TRACKBALL_H__
+
+// Includes:
+
+    #include "slave_protocol.h"
+
+// Macros:
+
+    #define BLACKBERRY_TRACKBALL_LEFT_PORT PORTB
+    #define BLACKBERRY_TRACKBALL_LEFT_GPIO GPIOB
+    #define BLACKBERRY_TRACKBALL_LEFT_IRQ PORTB_IRQn
+    #define BLACKBERRY_TRACKBALL_LEFT_CLOCK kCLOCK_PortB
+    #define BLACKBERRY_TRACKBALL_LEFT_PIN 6
+
+    #define BLACKBERRY_TRACKBALL_IRQ_HANDLER PORTB_IRQHandler
+
+// Variables:
+
+    extern pointer_delta_t BlackBerryTrackball_PointerDelta;
+
+// Functions:
+
+    void BlackberryTrackball_Init(void);
+
+#endif
diff --git a/keycluster/src/init_peripherals.c b/keycluster/src/init_peripherals.c
index a0072ae..5c9eef2 100644
--- a/keycluster/src/init_peripherals.c
+++ b/keycluster/src/init_peripherals.c
@@ -11,6 +11,7 @@
 #include "i2c_watchdog.h"
 #include "main.h"
 #include "module.h"
+#include "blackberry_trackball.h"
 
 i2c_slave_config_t slaveConfig;
 i2c_slave_handle_t slaveHandle;
@@ -86,4 +87,5 @@ void InitPeripherals(void)
     TestLed_Init();
     LedPwm_Init();
     initI2c();
+    BlackberryTrackball_Init();
 }
diff --git a/keycluster/src/slave_protocol_handler.c b/keycluster/src/slave_protocol_handler.c
index 0283174..9d596c5 100644
--- a/keycluster/src/slave_protocol_handler.c
+++ b/keycluster/src/slave_protocol_handler.c
@@ -11,6 +11,7 @@
 #include "bootloader.h"
 #include "module.h"
 #include "versions.h"
+#include "blackberry_trackball.h"
 
 i2c_message_t RxMessage;
 i2c_message_t TxMessage;
@@ -97,8 +98,10 @@ void SlaveTxHandler(void)
             uint8_t messageLength = BOOL_BYTES_TO_BITS_COUNT(MODULE_KEY_COUNT);
             if (MODULE_POINTER_COUNT) {
                 pointer_delta_t *pointerDelta = (pointer_delta_t*)(TxMessage.data + messageLength);
-                pointerDelta->x = 0;
-                pointerDelta->y = 0;
+                pointerDelta->x = BlackBerryTrackball_PointerDelta.x;
+                pointerDelta->y = BlackBerryTrackball_PointerDelta.y;
+                BlackBerryTrackball_PointerDelta.x = 0;
+                BlackBerryTrackball_PointerDelta.y = 0;
                 if (keyMatrix.keyStates[0]) {
                     pointerDelta->x = 1;
                 }