From e7ad2e1fab9c51189fdc8b4f2d81f625da9dd422 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Sat, 29 Oct 2016 22:09:13 +0200
Subject: Modernise PRBS generator and remove code for cmd line parser

---
 src/prbs.h | 74 +++++++++++++++++++++++++++++++++++---------------------------
 1 file changed, 42 insertions(+), 32 deletions(-)

(limited to 'src/prbs.h')

diff --git a/src/prbs.h b/src/prbs.h
index c039a6e..5b6b7c2 100644
--- a/src/prbs.h
+++ b/src/prbs.h
@@ -19,43 +19,53 @@
    along with ODR-DabMux.  If not, see <http://www.gnu.org/licenses/>.
    */
 
-#ifndef _PRBS
-#define _PRBS
+#pragma once
+
+#include <stdint.h>
+#include <stdlib.h>
 
 #ifdef HAVE_CONFIG_H
 #   include "config.h"
 #endif
 
+class PrbsGenerator {
+    public:
+        void setup(long polynomial);
 
-#ifdef __cplusplus
-extern "C" { // }
-#endif
+        uint8_t step(void);
 
-typedef struct {
-    // table of matrix products used to update a 32-bit PRBS generator
-    unsigned long prbs_table [4] [256];
-    // table of weights for 8-bit bytes
-    unsigned char weight[256];
-    // PRBS polynomial generator
-    unsigned long polynomial;
-    // PRBS generator polarity mask
-    unsigned char polarity_mask;
-    // PRBS accumulator
-    unsigned long accum;
-} prbs_data;
-
-
-unsigned long parity_check(unsigned long prbs_accum);
-void gen_prbs_table(void* args);
-unsigned long update_prbs(void* args);
-void gen_weight_table(void* args);
-unsigned long error_count(void* args, unsigned char *rx_data,
-        int rx_data_length);
-void gen_sequence(void* args, unsigned char *tx_data, int tx_data_length,
-        unsigned long polynomial);
-
-#ifdef __cplusplus
-}
-#endif
+        void rewind(void);
+
+    private:
+        /* Generate a table of matrix products to update a 32-bit PRBS
+         * generator. */
+        void gen_prbs_table(void);
+
+        /* Update a 32-bit PRBS generator eight bits at a time. */
+        unsigned long update_prbs(void);
+
+        /* Generate the weight table. */
+        void gen_weight_table(void);
+
+        /* Count the number of errors in a block of received data. */
+        size_t error_count(
+                unsigned char *rx_data,
+                int rx_data_length);
+
+        void gen_sequence(
+                unsigned char *tx_data,
+                int tx_data_length,
+                unsigned long polynomial);
+
+        // table of matrix products used to update a 32-bit PRBS generator
+        unsigned long prbs_table [4] [256];
+        // table of weights for 8-bit bytes
+        unsigned char weight[256];
+        // PRBS polynomial generator
+        unsigned long polynomial;
+        // PRBS generator polarity mask
+        unsigned char polarity_mask;
+        // PRBS accumulator
+        unsigned long accum;
+};
 
-#endif // _PRBS
-- 
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