diff --git a/.gitignore b/.gitignore
index ccb819d..50d898c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 /nbproject/private/
-/avrtft.elf
-/avrtft.hex
-/avrtft.lst
+/avrrfm.elf
+/avrrfm.hex
+/avrrfm.lst
diff --git a/README.md b/README.md
index 58d54f6..e0be4da 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,6 @@
 # AVRRFM
 
-Experimental to drive an RFM69 radio module with plain avr-libc.  
-
-Initial commit. 
+Experimental project to drive an RFM69 radio module with plain avr-libc.  
 
 Initializes the module and reads out register RegOpMode (0x01).
-That's all for now. 
\ No newline at end of file
+That's all for now. 
diff --git a/avrrfm.c b/avrrfm.c
index 8158798..3b5d0c4 100644
--- a/avrrfm.c
+++ b/avrrfm.c
@@ -94,6 +94,8 @@
     // enable global interrupts
     sei();
     
+    doStuff();
+    
     while (true) {
         if (int0) {
             int0 = false;
diff --git a/rfm69.c b/rfm69.c
index e3da944..01cb472 100644
--- a/rfm69.c
+++ b/rfm69.c
@@ -1,5 +1,5 @@
 /* 
- * File:   rfm69.h
+ * File:   rfm69.c
  * Author: torsten.roemer@luniks.net
  *
  * Created on 28. Januar 2025, 19:57
@@ -7,24 +7,65 @@
 
 #include "rfm69.h"
 
+/**
+ * Selects the radio to talk to via SPI.
+ */
+static void spiSel(void) {
+    PORT_RFM &= ~(1 << PIN_RCS);
+}
+
+/**
+ * Deselects the radio to talk to via SPI.
+ */
+static void spiDes(void) {
+    PORT_RFM |= (1 << PIN_RCS);
+}
+
+/**
+ * Writes the given value to the given register.
+ * 
+ * @param reg
+ * @param value
+ */
+static void regWrite(uint8_t reg, uint8_t value) {
+    spiSel();
+    transmit(reg | 0x80);
+    transmit(value);
+    spiDes();
+}
+
+/**
+ * Reads and returns the value of the given register.
+ * 
+ * @param reg
+ * @return value
+ */
+static uint8_t regRead(uint8_t reg) {
+    spiSel();
+    transmit(reg);
+    uint8_t value = transmit(0x00);
+    spiDes();
+    
+    return value;
+}
+
 void initRadio(void) {
     // wait a bit after POR
     _delay_ms(10);
     
-    // pull reset low to turn on the module
+    // pull reset LOW to turn on the module
     PORT_RFM &= ~(1 << PIN_RRST);
     
-    _delay_ms(5);
+    _delay_ms(5);    
+}
+
+void doStuff(void) {
+    uint8_t opMode = regRead(OP_MODE);
+    printString("OpMode: ");
+    printByte(opMode);
     
-    /*
-    radioSel();
-    transmit(0x39 | 0x80);
-    transmit(0xaa);
-    radioDes();
-    */
-    radioSel();
-    transmit(0x01);
-    uint8_t reg = transmit(0x00);
-    radioDes();
-    printByte(reg);
-}
\ No newline at end of file
+    regWrite(NODE_ADDR, 0xaa);
+    uint8_t nodeAddr = regRead(NODE_ADDR);
+    printString("NodeAddr: ");
+    printByte(nodeAddr);
+} 
\ No newline at end of file
diff --git a/rfm69.h b/rfm69.h
index 624650d..9570d7a 100644
--- a/rfm69.h
+++ b/rfm69.h
@@ -15,10 +15,20 @@
 #include "spi.h"
 #include "usart.h"
 
+#define FIFO      0x00
+#define OP_MODE   0x01
+
+#define NODE_ADDR 0x39
+
 /**
  * Initializes the radio module.
  */
 void initRadio(void);
 
+/**
+ * Do super useful stuff.
+ */
+void doStuff(void);
+
 #endif /* RFM69_H */
 
diff --git a/spi.c b/spi.c
index ca1581c..65d43ac 100644
--- a/spi.c
+++ b/spi.c
@@ -18,17 +18,9 @@
     SPSR &= ~(1 << SPI2X);
 }
 
-void radioSel(void) {
-    PORT_RFM &= ~(1 << PIN_RCS);
-}
-
-void radioDes(void) {
-    PORT_RFM |= (1 << PIN_RCS);
-}
-
 uint8_t transmit(uint8_t data) {
     SPDR = data;
     loop_until_bit_is_set(SPSR, SPIF);
 
     return SPDR;
-}
\ No newline at end of file
+}
diff --git a/spi.h b/spi.h
index bee2638..e9c3f66 100644
--- a/spi.h
+++ b/spi.h
@@ -23,16 +23,6 @@
 void spiFast(void);
 
 /**
- * Selects the radio to talk to via SPI.
- */
-void radioSel(void);
-
-/**
- * Deselects the display to talk to via SPI.
- */
-void radioDes(void);
-
-/**
  * Transmits the given byte and returns the byte reveived at the same time.
  * @param data byte to be written
  * @return byte read while writing