From 19aadb159e3c7b382df91e3821dbc6f20490b9cf Mon Sep 17 00:00:00 2001
From: Greek64 <greek64.mail@gmail.com>
Date: Thu, 25 Mar 2021 11:22:17 +0100
Subject: [PATCH] Add gen_sine.sh

Add Shell Script that generates sine wave arrays in VHDL packages.
---
 src/gen_sine.sh | 125 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100755 src/gen_sine.sh

diff --git a/src/gen_sine.sh b/src/gen_sine.sh
new file mode 100755
index 0000000..9f13951
--- /dev/null
+++ b/src/gen_sine.sh
@@ -0,0 +1,125 @@
+#!/bin/sh
+
+usage() {
+    echo "USAGE:  $0 -h|--help"
+    echo "USAGE:  $0 [-z NUMBER] [-a NUMBER] [-n NUMBER] [-f FILE]"
+    echo ""
+    echo "Options:"
+    echo "  -z  Sine Zero value in decimal (sin(0))"
+    echo "  -a  Sine Amplitude value in decimal (sin(pi))"
+    echo "  -n  Number of Period Samples"
+    echo "  -f  Output VHDL File"
+}
+
+
+#**********MAIN**********
+
+FILE="test_sine.vhd"
+amp=1024
+zero=512
+num=1024
+
+while [ $# -gt 0 ]; do
+    case "$1" in
+        -a)
+            shift
+            amp=$1
+            shift
+            case $amp in
+                ''|*[!0-9]*) 
+                    echo "ERROR: -a Option needs a Decimal Number."
+                    usage
+                    exit 1
+                    ;;
+                *);;
+            esac
+            ;;
+        -z)
+            shift
+            zero=$1
+            shift
+            case $zero in
+                ''|*[!0-9]*) 
+                    echo "ERROR: -z Option needs a Decimal Number."
+                    usage
+                    exit 1
+                    ;;
+                *);;
+            esac
+            ;;
+        -n)
+            shift
+            num=$1
+            shift
+            case $num in
+                ''|*[!0-9]*) 
+                    echo "ERROR: -n Option needs a Decimal Number."
+                    usage
+                    exit 1
+                    ;;
+                *);;
+            esac
+            ;;
+        -f)
+            shift
+            FILE=$1
+            shift
+            ;;
+        -h|--help)
+            usage
+            exit
+            ;;
+        *)
+            echo "ERROR: Unknown Option"
+            usage
+            exit 1
+            ;;
+    esac
+done
+
+#SANITY CHECK
+if [ $amp -gt $zero ] 
+then
+    echo "ERROR: The Sine Amplitude has to be smaller than the Zero point."
+    usage
+    exit 1
+fi
+if [ $(echo "$amp+$zero" | bc -l) -gt 4095 ] 
+then
+    echo "ERROR: The requested Sine exceeds the 12 Bits representation (2^12=4096)"
+    usage
+    exit 1
+fi
+
+#Calculate Stepping
+step=$(echo "(2*(4*a(1)))/$num" | bc -l)
+num=$(echo "$num-1" | bc -l)
+
+cat <<EOF >$FILE
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+package sine_package is
+EOF
+
+echo "    type SINE_ARRAY_TYPE is array (0 to $num)" >>$FILE
+array="    constant sine : SINE_ARRAY_TYPE := ("
+
+for i in $(seq 0 $num)
+do
+    #Calculate Value
+    val=$(echo "($amp * s($i*$step))+$zero" | bc -l)
+    #Round
+    val=$(printf '%.0f' $val)
+    array=$array$(printf 'x"%03X"' $val)
+    
+    if [ $i -eq $num ]
+    then
+        array=$array$(printf ');\n')
+    else
+        array=$array", "
+    fi
+done
+echo $array >>$FILE
+echo "end package;" >>$FILE