diff --git a/software/signal_processing/crc.c b/software/signal_processing/crc.c
index e214b9e..0b5ffc7 100644
--- a/software/signal_processing/crc.c
+++ b/software/signal_processing/crc.c
@@ -5,7 +5,66 @@
 int task_crc_run( void * task ) {
 
     // TODO
+	crc_config * config = ( crc_config *) task;
+
+	uint32_t value = config->start; // Startwert CRC vom gewaehlten Algorithmus (wird erst in der Funktion invertiert)
+
+	// Nachfolgende Antworten Lesen den FIFO der ersten Datenquelle aus und multiplizieren
+	// den jeweils gelesenen Wert mit 4 und speichern das Ergebnis in der Datensenke
+	for (uint32_t i = 0; i < DATA_CHANNEL_DEPTH; ++i) {
+		float_word a;
+		data_channel_read(config->base.sources[0], (uint32_t * ) & a.word );
+		float_word c;
+		//c.value = 4*a; //Hier mit Werten aus CRC FIFO multiplizieren
+		c.value = 0;
+
+		for (uint32_t j = 0; j < 32; j++) {
+			if (a.word & (1<<31)) {
+				c.word = (c.word * 2 + ((a.word & (1<<j))>>j)) ^ CRC32POLY;
+			} else {
+				c.word = (c.word * 2 + ((a.word & (1<<j))>>j));
+			}
+		}
+
+/*
+		for (uint32_t j = 0; j < 4; j++) {
+			if (a.word & (1<<31)) {
+				c.word = (c.word * 2 + ((a.word & (0xff<<j*8))>>j*8)) ^ CRC32POLY;
+			} else {
+				c.word = (c.word * 2 + ((a.word & (0xff<<j*8))>>j*8));
+			}
+		}
+*/
+		data_channel_write( config->base.sink, c.word );
+		printf("a= %08x c= %08x\n", a.word, c.word);
+	}
 
     return 0;
 }
 
+/*
+crc := 0000… (Startwert)
+für alle Bits b im Datenstrom:
+  wenn  das am weitesten links stehende Bit von crc 1 ist:
+    crc := (crc * 2 + b) xor CRC-Polynom
+  sonst:
+    crc := crc * 2 + b
+crc enthält das Ergebnis.
+*/
+/*
+const uint8_t   bitstream[] = { 1,0,0,0,1,1,0,0 };
+const int       bitcount    = 8;
+uint32_t        crc32       = 0;    // Schieberegister
+
+int main ()
+{
+    for (int i = 0; i < bitcount; i++)
+    {
+        if ( ((crc32 >> 31) & 1) != bitstream[i])
+            crc32 = (crc32 << 1) ^ CRC32POLY;
+        else
+            crc32 = (crc32 << 1);
+    }
+    printf ("0x%08X\n", crc32);
+}
+*/
diff --git a/software/signal_processing/system/task_crc.h b/software/signal_processing/system/task_crc.h
index 60301bd..4b45dd3 100644
--- a/software/signal_processing/system/task_crc.h
+++ b/software/signal_processing/system/task_crc.h
@@ -9,7 +9,8 @@ extern "C" {
 
 extern crc_config CRC_CONFIG;
 
-#define CRC32POLY   0xEDB88320        /* CRC-32 Polynom (Invers)*/
+//#define CRC32POLY   0xEDB88320        /* CRC-32 Polynom (Invers)*/
+#define CRC32POLY   0x04C11DB7
 
 int task_crc_run( void * task );
 
diff --git a/tests/software/task_crc/test_task_crc b/tests/software/task_crc/test_task_crc
new file mode 100755
index 0000000..9c4c5c5
Binary files /dev/null and b/tests/software/task_crc/test_task_crc differ