diff --git a/Makefile b/Makefile
index 2419611..bc74bf5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 PRG            = rgbyteclock
-OBJ            = rgbyteclock.o timer.o lcd.o main.o rtc.o spi.o ringbuffer.o crc.o ledcontroller.o rgbyteclock_patterns.o
+OBJ            = rgbyteclock.o timer.o lcd.o main.o rtc.o spi.o ringbuffer.o crc.o ledcontroller.o rgbyteclock_patterns.o led1642gw.o
 MCU_TARGET     = atmega164a
 OPTIMIZE       = -Os
 
@@ -28,6 +28,8 @@ $(PRG).elf: $(OBJ)
 rgbyteclock_patterns.o: timer.o lcd.o rgbyteclock_patterns.h rtc.o spi.o ledcontroller.o
 rgbyteclock.o: rgbyteclock_patterns.o
 main.o: rgbyteclock.o lcd.o spi.o ledcontroller.o rtc.o timer.o
+ledcontroller.o: led1642gw.o
+led1642gw.o: led1642gw.h
 timer.o: timer.h
 lcd.o: lcd.h timer.o
 rtc.o: rtc.h
diff --git a/led1642gw.c b/led1642gw.c
new file mode 100644
index 0000000..dd7162b
--- /dev/null
+++ b/led1642gw.c
@@ -0,0 +1,173 @@
+
+
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <struppi@struppi.name> wrote this file. As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.
+ * (c) 2014 Stefan Rupp
+ * ----------------------------------------------------------------------------
+ */
+
+
+#include <string.h>
+#include "led1642gw.h"
+#include <util/delay.h>
+
+#define NUM_LED1642GW_CHANNELS (16)
+#define NUM_LED_CHANNELS (NUM_LED1642GW_CHANNELS*NUM_LED1642GW_ICs)
+#define NUM_LED1642GW_ICs (3)
+
+static uint16_t ledbuffer[NUM_LED_CHANNELS];
+
+
+#define DDR_CLK (DDRC)
+#define PORT_CLK (PORTC)
+#define PIN_CLK (3)
+#define SET_CLK_H() ((PORT_CLK) |=  (1<<(PIN_CLK)))
+#define SET_CLK_L() ((PORT_CLK) &= ~(1<<(PIN_CLK)))
+
+#define DDR_SDI (DDRC)
+#define PORT_SDI (PORTC)
+#define PIN_SDI (4)
+#define SET_SDI_H() ((PORT_SDI) |=  (1<<(PIN_SDI)))
+#define SET_SDI_L() ((PORT_SDI) &= ~(1<<(PIN_SDI)))
+
+#define DDR_LE (DDRC)
+#define PORT_LE (PORTC)
+#define PIN_LE (2)
+#define SET_LE_H() ((PORT_LE) |=  (1<<(PIN_LE)))
+#define SET_LE_L() ((PORT_LE) &= ~(1<<(PIN_LE)))
+
+
+static void write_data(uint16_t data, uint8_t le_clocks)
+{
+  uint16_t mask = 0x8000;
+  int8_t bit;
+  //PORTC &= ~(1<<PC2);
+  SET_LE_L();
+  for (bit=15; bit>=le_clocks; bit--) {
+	//PORTC &= ~(1<<PC3);
+	SET_CLK_L(); 
+    if(data&mask) { SET_SDI_H(); }
+    else { SET_SDI_L(); }
+    //PORTC |= (1<<PC3);    
+	SET_CLK_H();
+    mask >>= 1;
+  }
+  
+  //PORTC |= (1<<PC2);
+  SET_LE_H();
+  for (/*noting to initialize*/; bit>=0; bit--) {
+	//PORTC &= ~(1<<PC3);
+	SET_CLK_L();
+    if(data&mask) { SET_SDI_H(); }
+    else { SET_SDI_L(); }
+    //PORTC |= (1<<PC3);    
+	SET_CLK_H();
+    mask >>= 1;
+ }
+
+  //PORTC &= ~(1<<PC3);
+  SET_CLK_L();
+  //PORTC &= ~(1<<PC2);
+  SET_LE_L();
+  //PORTC &= ~(1<<PC4);
+  SET_SDI_L();
+  
+}
+
+
+static void write_data_latch(uint16_t data)
+{
+  write_data(data, 4);
+}
+
+static void write_global_latch(uint16_t data)
+{
+  write_data(data, 6);
+}
+
+static void write_no_command(uint16_t data)
+{
+  write_data(data, 0);
+}
+
+
+void led1642gw_turn_all_on(void)
+{
+  
+  write_data(0xffff, 2);
+  _delay_us(10);
+  write_data(0xffff, 2);
+  _delay_us(10);
+  write_data(0xffff, 2);
+  _delay_us(10);
+}
+
+
+void led1642gw_turn_all_off(void)
+{
+  
+  write_data(0x0000, 2);
+  _delay_us(10);
+  write_data(0x0000, 2);
+  _delay_us(10);
+  write_data(0x0000, 2);
+  _delay_us(10);
+}
+
+
+void led1642gw_init(void)
+{
+
+  //PORTC &= ~(1<<PC3); // SCK
+  SET_CLK_L();
+  //PORTC &= ~(1<<PC4); // DATA
+  SET_SDI_L();
+  //PORTC &= ~(1<<PC2); // LE
+  SET_LE_L();
+  //DDRC |= (1<<PC3); // SCK
+  DDR_CLK |= (1<<PIN_CLK);
+  //DDRC |= (1<<PC4); // DATA
+  DDR_SDI |= (1<<PIN_SDI);
+  //DDRC |= (1<<PC2); // LE
+  DDR_LE |= (1<<PIN_LE);
+  memset(ledbuffer, 0x00, sizeof(ledbuffer));
+  led1642gw_flush();
+}
+
+
+void led1642gw_flush(void)
+{
+  uint8_t channel;
+  uint8_t ic;
+  for (channel=0; channel<NUM_LED1642GW_CHANNELS-1; channel++) {
+	  for (ic=0; ic<(NUM_LED1642GW_ICs-1); ic++) {
+		  write_no_command(ledbuffer[channel+(NUM_LED1642GW_CHANNELS*ic)]);
+	  }
+	  write_data_latch(ledbuffer[channel+(ic*NUM_LED1642GW_CHANNELS)]);
+  }
+  for (ic=1; ic<NUM_LED1642GW_ICs; ic++) {
+	  write_no_command(ledbuffer[(ic*NUM_LED1642GW_CHANNELS)-1]);
+  }
+  write_global_latch(ledbuffer[(ic*NUM_LED1642GW_CHANNELS)-1]);
+
+}
+
+
+void led1642gw_set_channel(uint8_t channel, uint16_t value)
+{
+  if (channel < NUM_LED_CHANNELS) {
+    ledbuffer[channel] = value;
+  }
+
+}
+
+
+void led1642gw_clear(void)
+{
+  memset(ledbuffer, 0x00, sizeof(ledbuffer));
+}
+
diff --git a/led1642gw.h b/led1642gw.h
new file mode 100644
index 0000000..088ccfe
--- /dev/null
+++ b/led1642gw.h
@@ -0,0 +1,28 @@
+
+
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <struppi@struppi.name> wrote this file. As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.
+ * (c) 2014 Stefan Rupp
+ * ----------------------------------------------------------------------------
+ */
+
+
+#ifndef LED1642GW_H_
+#define LED1642GW_H_
+
+#include <avr/io.h>
+#include <stdint.h>
+
+void led1642gw_init(void);
+void led1642gw_turn_all_on(void);
+void led1642gw_turn_all_off(void);
+void led1642gw_flush(void);
+void led1642gw_set_channel(uint8_t channel, uint16_t value);
+void led1642gw_clear(void);
+
+
+#endif // LED1642GW_H_
diff --git a/ledcontroller.c b/ledcontroller.c
index 9f20a01..209a7ed 100644
--- a/ledcontroller.c
+++ b/ledcontroller.c
@@ -17,16 +17,9 @@
  */
 
 #include "ledcontroller.h"
-#include <string.h>
-#include <util/delay.h>
+#include "led1642gw.h"
 
 
-#define NUM_LED1642GW_ICs (3)
-#define NUM_LED1642GW_CHANNELS (16)
-#define NUM_LED_CHANNELS (NUM_LED1642GW_CHANNELS*NUM_LED1642GW_ICs)
-
-static uint16_t ledbuffer[NUM_LED_CHANNELS];
-
 static int8_t map_lednum_to_channels(uint8_t lednum, uint8_t *channel_r, uint8_t *channel_g, uint8_t *channel_b)
 {
   uint8_t ret=0;
@@ -115,125 +108,38 @@ static int8_t map_lednum_to_channels(uint8_t lednum, uint8_t *channel_r, uint8_t
 }
 
 
-static void write_data(uint16_t data, uint8_t le_clocks)
-{
-  uint16_t mask = 0x8000;
-  int8_t bit;
-  PORTC &= ~(1<<PC2);
-  for (bit=15; bit>=le_clocks; bit--) {
-    PORTC &= ~(1<<PC3);
-    if(data&mask) { PORTC |= (1<<PC4); }
-    else { PORTC &= ~(1<<PC4); }
-    PORTC |= (1<<PC3);    
-    mask >>= 1;
-  }
-  
-  PORTC |= (1<<PC2);
-  for (/*noting to initialize*/; bit>=0; bit--) {
-    PORTC &= ~(1<<PC3);
-    if(data&mask) { PORTC |= (1<<PC4); }
-    else { PORTC &= ~(1<<PC4); }
-    PORTC |= (1<<PC3);    
-    mask >>= 1;
- }
-
-  PORTC &= ~(1<<PC3);
-  PORTC &= ~(1<<PC2);
-  PORTC &= ~(1<<PC4);
-}
-
-
-static void write_data_latch(uint16_t data)
-{
-  write_data(data, 4);
-}
-
-static void write_global_latch(uint16_t data)
-{
-  write_data(data, 6);
-}
-
-static void write_no_command(uint16_t data)
-{
-  write_data(data, 0);
-}
-
-
-void led_turn_all_on(void)
-{
-  
-  write_data(0xffff, 2);
-  _delay_us(10);
-  write_data(0xffff, 2);
-  _delay_us(10);
-  write_data(0xffff, 2);
-  _delay_us(10);
-}
-
-
-void led_turn_all_off(void)
-{
-  
-  write_data(0x0000, 2);
-  _delay_us(10);
-  write_data(0x0000, 2);
-  _delay_us(10);
-  write_data(0x0000, 2);
-  _delay_us(10);
-}
-
-
-void led_init(void)
-{
-
-  PORTC &= ~(1<<PC3); // SCK
-  PORTC &= ~(1<<PC4); // DATA
-  PORTC &= ~(1<<PC2); // LE
-  DDRC |= (1<<PC3); // SCK
-  DDRC |= (1<<PC4); // DATA
-  DDRC |= (1<<PC2); // LE
-  memset(ledbuffer, 0x00, sizeof(ledbuffer));
-  led_flush();
-}
-
-
 void led_set(uint8_t lednum, uint16_t red, uint16_t green, uint16_t blue)
 {
-  uint8_t c_r, c_g, c_b;
+	uint8_t c_r, c_g, c_b;
   
-  if ( map_lednum_to_channels(lednum, &c_r, &c_g, &c_b) > 0 ) {
-    ledbuffer[c_r] = red;
-    ledbuffer[c_g] = green;
-    ledbuffer[c_b] = blue;
-  }
-}
+	if ( map_lednum_to_channels(lednum, &c_r, &c_g, &c_b) > 0 ) {
+		led1642gw_set_channel(c_r, red);
+		led1642gw_set_channel(c_g, green);
+		led1642gw_set_channel(c_b, blue);
+	}
 
+}
 
 void led_flush(void)
 {
-  uint8_t channel;
-  for (channel=0; channel<NUM_LED1642GW_CHANNELS-1; channel++) {
-    write_no_command(ledbuffer[channel+0]);
-    write_no_command(ledbuffer[channel+NUM_LED1642GW_CHANNELS]);
-    write_data_latch(ledbuffer[channel+(2*NUM_LED1642GW_CHANNELS)]);
-  }
-  write_no_command(ledbuffer[NUM_LED1642GW_CHANNELS-1]);
-  write_no_command(ledbuffer[(2*NUM_LED1642GW_CHANNELS)-1]);
-  write_global_latch(ledbuffer[(3*NUM_LED1642GW_CHANNELS)-1]);
-
-}
-
-
-void led_set_channel(uint8_t channel, uint16_t value)
-{
-  if (channel < NUM_LED_CHANNELS) {
-    ledbuffer[channel] = value;
-  }
-
+	led1642gw_flush();
 }
 
 
 void led_clear(void)
 {
-  memset(ledbuffer, 0x00, sizeof(ledbuffer));
+	led1642gw_clear();
 }
+
+
+void led_init(void)
+{
+	led1642gw_init();
+}
+
+
+void led_turn_all_on(void)
+{
+	led1642gw_turn_all_on();
+}
+
diff --git a/ledcontroller.h b/ledcontroller.h
index d53e859..e13e2a2 100644
--- a/ledcontroller.h
+++ b/ledcontroller.h
@@ -14,18 +14,13 @@
 #define LEDCONTROLLER_H
 
 #include <avr/io.h>
-#include <compat/ina90.h>    // ==> _NOP()
 #include "timer.h"
 
-
 void led_init(void);
 void led_set(uint8_t lednum, uint16_t red, uint16_t green, uint16_t blue);
 void led_flush(void);
-void led_turn_all_on(void);
-void led_turn_all_off(void);
-void led_set_channel(uint8_t channel, uint16_t value);
 void led_clear(void);
-
+void led_turn_all_on(void);
 
 
 #endif // LEDCONTROLLER_H