crc staengert

software/signal_processing/crc.c

@@ -2,10 +2,39 @@
 #include "system/data_channel.h"
 #include "system/float_word.h"
 
-int task_crc_run( void * task ) {
+#define CRC32_POLY 0xEDB88320
+#define CRC32_INIT 0xFFFFFFFF
+#define DATA_CHANNEL_DEPTH 1024
 
-    // TODO
+static uint32_t crc32_update(uint32_t crc, uint32_t data) {
+    int i;
+    crc ^= data;
+    for (i = 0; i < 32; i++) {
+        if (crc & 1) {
+            crc = (crc >> 1) ^ CRC32_POLY;
+        } else {
+            crc >>= 1;
+        }
+    }
+    return crc;
+}
 
+int task_crc_run(void *task) {
+    crc_config *config = (crc_config *)task;
+    uint32_t source_base = config->base.sources[0];
+    uint32_t sink_base = config->base.sink;
+    uint32_t crc = CRC32_INIT;
+    uint32_t value;
+    
+    for (uint32_t i = 0; i < DATA_CHANNEL_DEPTH; i++) {
+        data_channel_read(source_base, &value);
+        crc = crc32_update(crc, value);
+    }
+    
+    crc ^= 0xFFFFFFFF;
+    
+    data_channel_write(sink_base, crc);
+    
     return 0;
 }
 

software/signal_processing/sine.c

@@ -2,9 +2,26 @@
 #include "system/data_channel.h"
 #include "system/float_word.h"
 
+#include <math.h>
+#include <limits.h>
+
 int task_sine_run( void * data ) {
 
-    // TODO
+    sine_config *task = (sine_config *)data;
+    uint32_t data_channel_base = task->base.sink;
+
+    uint32_t samples_per_period = task->samples_per_periode;
+    float phase = task->phase;
+    float amplitude = task->amplitude;
+
+    float step = ( 2.0f * (float)M_PI ) / (float)samples_per_period;
+
+    for ( uint32_t i = 0; i < 1024; ++i ) {
+        float_word sample;
+        float angle = phase + (float)i * step;
+        sample.value = amplitude * sinf( angle );
+        data_channel_write( data_channel_base, sample.word );
+    }
 
     return 0;
 }