diff --git a/Makefile b/Makefile
index a614297..40904bf 100644
--- a/Makefile
+++ b/Makefile
@@ -51,7 +51,7 @@
 	$(OBJDUMP) -S $< > $@
  
 size:  $(TARGET).elf
-	$(AVRSIZE) -C --mcu=$(MCU) $(TARGET).elf
+	$(AVRSIZE) --mcu=$(MCU) $(TARGET).elf
 
 clean:
 	rm -f $(TARGET).elf $(TARGET).hex $(TARGET).obj \
diff --git a/avrrfm.c b/avrrfm.c
index afcc0bc..b8869f2 100644
--- a/avrrfm.c
+++ b/avrrfm.c
@@ -90,11 +90,13 @@
     printString("Hello Radio!\r\n");
     
     initRadio(868600);
-    sendByte(0xaa);
-    sendString("Hello Radio!");
+    // sendByte(0xaa);
+    // sendString("Hello Radio!");
+    receiveByte();
     
     while (true) {
-        // do useful stuff
+        // sendByte(0xaa);
+        // _delay_ms(1000);
     }
 
     return 0;
diff --git a/rfm69.c b/rfm69.c
index 4ee16f1..5a08700 100644
--- a/rfm69.c
+++ b/rfm69.c
@@ -7,11 +7,6 @@
 
 #include "rfm69.h"
 
-/**
- * Sets the module to the given operating mode.
- */
-#define set_mode(mode) regWrite(OP_MODE, (regRead(OP_MODE) & ~MASK_MODE) | (mode & MASK_MODE))
-
 static volatile uint8_t irqFlags1;
 static volatile uint8_t irqFlags2;
 
@@ -57,6 +52,13 @@
     return value;
 }
 
+/**
+ * Sets the module to the given operating mode.
+ */
+static void setMode(uint8_t mode) {
+    regWrite(OP_MODE, (regRead(OP_MODE) & ~MASK_MODE) | (mode & MASK_MODE));
+}
+
 ISR(INT0_vect) {
     irqFlags1 = regRead(IRQ_FLAGS1);
     irqFlags2 = regRead(IRQ_FLAGS2);
@@ -110,12 +112,14 @@
     printString("Sending payload: ");
     printByte(payload);
     
-    set_mode(MODE_TX);
+    setMode(MODE_TX);
     
     loop_until_bit_is_set(irqFlags2, 3);
     printString("PacketSent\r\n");
-    
-    set_mode(MODE_SLEEP);
+
+    // better wait a bit before going to standby?
+    _delay_ms(10);
+    setMode(MODE_STDBY);
 }
 
 size_t sendString(char *payload) {
@@ -133,12 +137,42 @@
     spiDes();
     
     printString("Sending payload...\r\n");    
-    set_mode(MODE_TX);
+    setMode(MODE_TX);
     
     loop_until_bit_is_set(irqFlags2, 3);
     printString("PacketSent\r\n");
     
-    set_mode(MODE_SLEEP);
+    _delay_ms(10);
+    setMode(MODE_STDBY);
     
     return len;
+}
+
+uint8_t receiveByte(void) {
+    
+    // set variable packet length, turn off CRC for now
+    regWrite(PCK_CFG1, (regRead(PCK_CFG1) | 0x80) & ~0x10);
+    
+    // get "PayloadReady" on DIO0
+    regWrite(DIO_MAP1, (regRead(DIO_MAP1) & ~0x80) | 0x40);
+    
+    printString("Starting receiving...\r\n");    
+    setMode(MODE_RX);
+    
+    loop_until_bit_is_set(irqFlags2, 2);
+    printString("PayloadReady\r\n");
+    
+    // can also read FIFO after going to standby
+    uint8_t len = regRead(FIFO);
+    uint8_t payload = regRead(FIFO);
+    
+    printString("Length: ");
+    printUint(len);
+    printString("Payload: ");
+    printByte(payload);
+    
+    _delay_ms(10);
+    setMode(MODE_STDBY);
+    
+    return payload;
 }
\ No newline at end of file
diff --git a/rfm69.h b/rfm69.h
index a88323f..cf42e2e 100644
--- a/rfm69.h
+++ b/rfm69.h
@@ -66,5 +66,7 @@
  */
 size_t sendString(char *payload);
 
+uint8_t receiveByte(void);
+
 #endif /* RFM69_H */