Add prebuilt firmware package

firmware/flash.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [ "$#" -ne 1 ]; then
+    echo "Usage: $0 /dev/ttyUSB0" >&2
+    exit 2
+fi
+
+radick_port="$1"
+firmware_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+echo "Keep the RD-03D external 5 V supply OFF while flashing."
+
+exec python3 -m esptool \
+    --chip esp32s3 \
+    --port "$radick_port" \
+    --baud 460800 \
+    --before default_reset \
+    --after hard_reset \
+    write_flash \
+    --flash_mode dio \
+    --flash_freq 80m \
+    --flash_size 4MB \
+    0x0 "$firmware_dir/bootloader.bin" \
+    0x8000 "$firmware_dir/partition-table.bin" \
+    0x10000 "$firmware_dir/radick.bin"