From: baobrien <baobrien@01035d8c-6547-0410-b346-abe4f91aad63>
Date: Sun, 10 Apr 2016 05:29:40 +0000 (+0000)
Subject: Deframer unit test written
X-Git-Url: http://git.whiteaudio.com/gitweb/?a=commitdiff_plain;h=9ee5cea4620448c9128f64cf30437453d02612ea;p=freetel-svn-tracking.git

Deframer unit test written



git-svn-id: https://svn.code.sf.net/p/freetel/code@2778 01035d8c-6547-0410-b346-abe4f91aad63
---

diff --git a/codec2-dev/unittest/CMakeLists.txt b/codec2-dev/unittest/CMakeLists.txt
index 732ac7d8..e365cd7b 100644
--- a/codec2-dev/unittest/CMakeLists.txt
+++ b/codec2-dev/unittest/CMakeLists.txt
@@ -69,6 +69,9 @@ target_link_libraries(tfsk m)
 add_executable(tfmfsk tfmfsk.c ../src/octave.c ../src/modem_probe.c)
 target_link_libraries(tfmfsk m)
 
+add_executable(tdeframer tdeframer.c)
+target_link_libraries(tdeframer m codec2)
+
 #add_executable(t48_8 t48_8.c ../src/fdmdv.c ../src/kiss_fft.c)
 #target_link_libraries(t48_8 codec2)
 
diff --git a/codec2-dev/unittest/tdeframer.c b/codec2-dev/unittest/tdeframer.c
new file mode 100644
index 00000000..5725eae2
--- /dev/null
+++ b/codec2-dev/unittest/tdeframer.c
@@ -0,0 +1,120 @@
+/*---------------------------------------------------------------------------*\
+
+  FILE........: tdeframer.c
+  AUTHOR......: Brady O'Brien
+  DATE CREATED: 8 April 2016
+
+  C unit test for the VHF framer/deframer used by modes 2400A and 2400B.
+  The deframer should sync up within one frame at a BER of 10e-3
+\*---------------------------------------------------------------------------*/
+
+/*
+  Copyright (C) 2016 David Rowe
+
+  All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License version 2.1, as
+  published by the Free Software Foundation.  This program is
+  distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+  License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* BER of test */
+#define TESTBER 0.01
+
+/* Frame count */
+#define FRCNT 1500
+
+/* Random bits leading frame */
+#define LRCNT 142
+
+#include <stdio.h>
+#include <math.h>
+#include <stdint.h>
+#include <freedv_vhf_framing.h>
+#include <golay23.h>
+
+/* The main loop of the test driver */
+int main(int argc,char *argv[]){
+    uint8_t * bit_buffer;
+    uint8_t c2_buffer[7] = {0,0,0,0,0,0,0};
+    struct freedv_vhf_deframer * fvd;
+    int i,p,k;
+    int bitbufferlen = (LRCNT+96*FRCNT);
+    
+    srand(1);
+    golay23_init();
+    
+    /* Set up the deframer */
+    fvd = fvhff_create_deframer(FREEDV_VHF_FRAME_A,1);
+
+    /* Allocate bit buffer */
+    bit_buffer = (uint8_t *) malloc(sizeof(uint8_t)*bitbufferlen);
+    p = 0;
+    
+    /* Fill out front of buffer */
+    for(i=0; i<LRCNT; i++){
+        bit_buffer[p++] = rand()&0x1;
+    }
+    
+    /* Place frames */
+    for(i=0; i<FRCNT; i++){
+        /* Encode frame index into golay codeword to protect from test BER*/
+        k = golay23_encode((i+1)&0x0FFF);
+        c2_buffer[0] = (k    )&0xFF;
+        c2_buffer[1] = (k>>8 )&0xFF;
+        c2_buffer[2] = (k>>16)&0x7F;
+        /* Frame the bits */
+        fvhff_frame_bits(FREEDV_VHF_FRAME_A, &bit_buffer[p+(i*96)], c2_buffer,NULL,NULL);
+    }
+    
+    /* Flip bits */
+    for(i=0; i<bitbufferlen; i++){
+        if( (rand()&0xFFFF) < (int)(TESTBER*0xFFFF)){
+            bit_buffer[i] = bit_buffer[i]?0:1;
+        }
+    }
+    
+    p=0;
+    int first_extract = 0;
+    int total_extract = 0;
+    int err_count = 0;
+    /* Deframe some bits */
+    for(i=0; i<bitbufferlen; i+=96){
+        if( fvhff_deframe_bits(fvd, c2_buffer, NULL, NULL, &bit_buffer[i])){
+            /* Extract golay23 codeword */
+            k  = ((int)c2_buffer[0])    ;
+            k |= ((int)c2_buffer[1])<<8 ;
+            k |= ((int)c2_buffer[2])<<16;
+            k = k & 0x7FFFFF;
+            /* Decode frame index */
+            p = golay23_decode(k);
+            err_count += golay23_count_errors(k,p);
+            p = p>>11;
+            printf("Got frame %d\n",p);
+            total_extract++;
+            if(first_extract==0)
+                first_extract=p;
+        }
+    }
+    
+    float measured_ber = (float)err_count/(float)(23*total_extract);
+    
+    printf("First extracted frame %d\n",first_extract);
+    printf("Extracted %d frames of %d, %f hit rate\n",total_extract,FRCNT,((float)total_extract/(float)FRCNT));
+    printf("Bit error rate %f measured\n",measured_ber);
+    /* Check test condition */
+    if(first_extract<2){
+        printf("Test passed at test BER of %f!\n",TESTBER);
+        exit(0);
+    }else{
+        printf("** Test failed at test BER of %f!\n",TESTBER);
+        exit(1);
+    }
+}