Adds auto-flashing script for bitstream updates

Introduces a Bash script to automate flashing bitstream files to devices.
Includes argument parsing, file monitoring, and error handling.
Enhances development workflow by streamlining device programming.

autoflash.sh

@@ -0,0 +1,83 @@
+#!/bin/bash
+
+# 🧠 Show help message
+function show_help() {
+    echo "Usage: $0 [-d device] [-i index] TopModuleName"
+    echo
+    echo "Arguments:"
+    echo "  -d <device>   Name of the USB device (e.g., DOnbUsb), optional (default: DOnbUsb)"
+    echo "  -i <index>    Interface index, optional (default: 0)"
+    echo "  TopModule     Name of the top module (e.g., VGATimingGenerator)"
+    exit 1
+}
+
+# 🔧 Default values
+DEVICE="DOnbUsb"
+INDEX=0
+
+# 🧩 Parse arguments
+while [[ "$1" =~ ^- ]]; do
+    case "$1" in
+        -d)
+            shift
+            DEVICE="$1"
+            ;;
+        -i)
+            shift
+            INDEX="$1"
+            ;;
+        -h|--help)
+            show_help
+            ;;
+        *)
+            echo "❌ Unknown option: $1"
+            show_help
+            ;;
+    esac
+    shift
+done
+
+# 📛 Get top module name
+TOPMODULE="$1"
+
+if [ -z "$TOPMODULE" ]; then
+    echo "❌ Error: No top module specified."
+    show_help
+fi
+
+# 📂 Path to bitstream file
+BITFILE="working/${TOPMODULE}.bit"
+
+# 📡 Flashing function
+function flash_bitstream() {
+    echo "⚡ Flashing bitstream to device $DEVICE, index $INDEX..."
+    yes Y | djtgcfg prog -d "$DEVICE" -i "$INDEX" -f "$BITFILE"
+}
+
+# 🧹 Cleanup on Ctrl+C
+function cleanup() {
+    echo
+    echo "👋 Terminated. Auto-flashing is no longer active."
+    exit 0
+}
+trap cleanup SIGINT
+
+# 🔍 Initial check
+if [ -f "$BITFILE" ]; then
+    echo "📦 Bitstream file $BITFILE found. Starting initial flash..."
+    flash_bitstream
+    echo "✅ Initial flash completed. Waiting for changes..."
+else
+    echo "⚠️  Bitstream file $BITFILE does not exist yet. Waiting for initial creation..."
+fi
+
+echo "👂 Monitoring $BITFILE for changes... (Press Ctrl+C to exit)"
+
+# ♻️ Infinite watch loop
+while true; do
+    inotifywait -e close_write "$BITFILE" >/dev/null 2>&1
+    echo "🌀 Change detected. Waiting 1 second..."
+    sleep 1
+    flash_bitstream
+    echo "✅ Done. Waiting for next change..."
+done