From 69302fa6497bfb5b5908682bba4e0d5bf7ad4c92 Mon Sep 17 00:00:00 2001
From: badenbergra78621 <badenbergra78621@efiapps0.ads1.fh-nuernberg.de>
Date: Sat, 2 Dec 2023 23:50:26 +0100
Subject: [PATCH] crc.c Korrekturen

---
 software/signal_processing/crc.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/software/signal_processing/crc.c b/software/signal_processing/crc.c
index 9152f38..8830ddd 100644
--- a/software/signal_processing/crc.c
+++ b/software/signal_processing/crc.c
@@ -1,7 +1,27 @@
 #include "system/task_crc.h"
 #include "system/data_channel.h"
 #include "system/float_word.h"
-#include <zlib.h> 				/* c-library for crc32() */
+//#include <zlib.h> 				/* c-library for crc32() */
+#include <stddef.h>					/* for "size_t" */
+
+
+uint32_t crc32(const char *s,size_t n) {
+	uint32_t crc=0xFFFFFFFF;
+	for(size_t i=0;i<n;i++) 
+	{
+		char ch=s[i];
+			for(size_t j=0;j<8;j++) {
+				uint32_t b=(ch^crc)&1;
+				crc>>=1;
+				if(b) crc=crc^0xEDB88320;
+				ch>>=1;
+		}
+	}
+	return ~crc;
+}
+
+
+
 
 int task_crc_run( void * task ) {
 
@@ -16,9 +36,9 @@ int task_crc_run( void * task ) {
 
 	for ( uint32_t i = 0; i < DATA_CHANNEL_DEPTH; ++i )
 	{
-		data_channel_read(crc->base.sources[0], uint32_t(&crc_input.value));
+		data_channel_read(crc->base.sources[0], (uint32_t*)&crc_input.value);
 		
-		crc_res.value = crc32(0, (const void*)crc_input.value, sizeof(crc_input.value));
+		crc_res.word = crc32((const void *)&crc_input, sizeof(crc_input));
 	
 	}