add swd reset script

reset_nrf54l.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# reset_nrf54l.sh — Reset nRF54L targets via OpenOCD using Raspberry Pi SWD
+
+set -euo pipefail  # Strict mode: exit on error, undefined vars, and pipe failures
+
+# Print a helpful message on any error, preserving the failing exit code
+trap 'rc=$?; echo "❌ nRF54L reset failed (exit $rc)." >&2; exit $rc' ERR
+
+# Default values
+INTERFACE="swd0"
+
+usage() {
+  echo "Usage: $0 [-i swd0|swd1] [-h]"
+  echo
+  echo "Options:"
+  echo "  -i <interface>   SWD interface to use: swd0 (default) or swd1"
+  echo "  -h               Show this help message and exit"
+  exit 1
+}
+
+# Parse arguments
+while getopts "i:h" opt; do
+  case "$opt" in
+    i)
+    INTERFACE="$OPTARG"
+      ;;
+    h)
+      usage
+      ;;
+    *)
+      usage
+      ;;
+  esac
+done
+
+# Run OpenOCD reset command
+sudo openocd \
+  -f ./raspberrypi-${INTERFACE}.cfg \
+  -f target/nordic/nrf54l.cfg \
+  -c "init" \
+  -c "reset run" \
+  -c "shutdown"
+
+echo "✅ nRF54L reset issued on ${INTERFACE}."
+
+# Success
+exit 0
+a