diff --git a/led1642gw.c b/led1642gw.c
index 2e296e1..23af0cf 100644
--- a/led1642gw.c
+++ b/led1642gw.c
@@ -29,7 +29,7 @@
  * the data registers of the LED1642 ICs.
  */
 static uint16_t ledbuffer[NUM_LED_CHANNELS];
-
+static uint16_t config_reg[3];
 
 /*
  * Write 16 bits of \data, with LE set high
@@ -75,6 +75,7 @@ static void write_data_latch(uint16_t data)
   write_data(data, 4);
 }
 
+
 /* 
  * Write data to BRIGHTNESS GLOBAL LATCH register.
  * that means setting LE high for 5 or 6 clock cycles
@@ -84,6 +85,7 @@ static void write_global_latch(uint16_t data)
   write_data(data, 6);
 }
 
+
 /*
  * This function shifts data through the 16bit shift
  * register of the LED1642GW, without writing the data
@@ -97,6 +99,20 @@ static void write_no_command(uint16_t data)
 }
 
 
+/*
+ * Write data to CONFIG register.
+ * that means setting LE high for 7 clock cycles
+ */
+void led1642gw_flush_config(void)
+{
+  uint8_t ic;
+  for (ic=0; ic<(NUM_LED1642GW_ICs-1); ic++) {
+    write_no_command(config_reg[ic]);
+  }
+  write_data(config_reg[ic], 7);
+}
+
+
 /* 
  * Turn all channels on, so the data in the DATA LATCH 
  * register affects the LEDs attached to the IC.
@@ -104,8 +120,10 @@ static void write_no_command(uint16_t data)
 void led1642gw_turn_all_on(void)
 {
   
-  write_data(0xffff, 2);
-  write_data(0xffff, 2);
+  uint8_t ic;
+  for (ic=0; ic<(NUM_LED1642GW_ICs-1); ic++) {
+    write_no_command(0xffff);
+  }
   write_data(0xffff, 2);
 }
 
@@ -115,9 +133,10 @@ void led1642gw_turn_all_on(void)
  */
 void led1642gw_turn_all_off(void)
 {
-  
-  write_data(0x0000, 2);
-  write_data(0x0000, 2);
+  uint8_t ic;
+  for (ic=0; ic<(NUM_LED1642GW_ICs-1); ic++) {
+    write_no_command(0x0000);
+  }
   write_data(0x0000, 2);
 }
 
@@ -137,6 +156,7 @@ void led1642gw_init(void)
   DDR_SDI |= (1<<PIN_SDI);
   DDR_LE |= (1<<PIN_LE);
   memset(ledbuffer, 0x00, sizeof(ledbuffer));
+  memset(config_reg, 0x00, sizeof(config_reg));
   led1642gw_flush();
 }
 
@@ -196,3 +216,4 @@ void led1642gw_clear(void)
   memset(ledbuffer, 0x00, sizeof(ledbuffer));
 }
 
+