diff --git a/include/pxi.h b/include/pxi.h
index c878761..73bd396 100644
--- a/include/pxi.h
+++ b/include/pxi.h
@@ -3,8 +3,6 @@
 #include "types.h"
 #include "io.h"
 
-
-
 // Defines for PX_SYNC regs
 #define PXI_DATA_RECEIVED(reg)      (reg & 0xFF)
 #define PXI_DATA_SENT(reg)          (reg>>8 & 0xFF)
@@ -23,7 +21,15 @@
 #define PXI_EMPTY_FULL_ERROR        (1u<<14)
 #define PXI_ENABLE_SEND_RECV_FIFO   (1u<<15)
 
+// Custom PXI Command/Reply Definitions
+#define PXI_CMD_FIRM_LAUNCH			0x544F4F42
+#define PXI_RPL_FIRM_LAUNCH_READY	0x4F4B6666
+#define PXI_RPL_OK					0x4F4B4F4B
+#define PXI_RPL_HOME_PRESSED		0x4F4B4F4B
+
 
 void PXI_init(void);
 void PXI_sendWord(u32 val);
+bool PXI_trySendWord(u32 val);
 u32  PXI_recvWord(void);
+u32 PXI_tryRecvWord(bool *success);
diff --git a/source/arm11/pxi.c b/source/arm11/pxi.c
index 357d31a..554b7ef 100644
--- a/source/arm11/pxi.c
+++ b/source/arm11/pxi.c
@@ -17,10 +17,29 @@
 	REG_PXI_SYNC11 |= PXI_NOTIFY_9;
 }
 
+bool PXI_trySendWord(u32 val)
+{
+	if(REG_PXI_CNT11 & PXI_SEND_FIFO_FULL)
+		return false;
+	REG_PXI_SEND11 = val;
+	REG_PXI_SYNC11 |= PXI_NOTIFY_9;
+	return true;
+}
+
 u32 PXI_recvWord(void)
 {
-	// Returns 0 for now if there is no data.
-	// Will be fixed after implementing interrupts
-	if(REG_PXI_CNT11 & PXI_RECV_FIFO_EMPTY) return 0;
+	while(REG_PXI_CNT11 & PXI_RECV_FIFO_EMPTY);
+	return REG_PXI_RECV11;
+}
+
+u32 PXI_tryRecvWord(bool *success)
+{
+	if(REG_PXI_CNT11 & PXI_RECV_FIFO_EMPTY);
+	{
+		*success = false;
+		return 0;
+	}
+
+	*success = true;
 	return REG_PXI_RECV11;
 }
diff --git a/source/arm9/pxi.c b/source/arm9/pxi.c
index 10f5fa4..cdce95b 100644
--- a/source/arm9/pxi.c
+++ b/source/arm9/pxi.c
@@ -17,8 +17,29 @@
 	REG_PXI_SYNC9 |= PXI_NOTIFY_11;
 }
 
+bool PXI_trySendWord(u32 val)
+{
+	if(REG_PXI_CNT9 & PXI_SEND_FIFO_FULL)
+		return false;
+	REG_PXI_SEND9 = val;
+	REG_PXI_SYNC9 |= PXI_NOTIFY_11;
+	return true;
+}
+
 u32 PXI_recvWord(void)
 {
 	while(REG_PXI_CNT9 & PXI_RECV_FIFO_EMPTY);
 	return REG_PXI_RECV9;
 }
+
+u32 PXI_tryRecvWord(bool *success)
+{
+	if(REG_PXI_CNT9 & PXI_RECV_FIFO_EMPTY);
+	{
+		*success = false;
+		return 0;
+	}
+
+	*success = true;
+	return REG_PXI_RECV9;
+}