From 0ec133cf0e22cedb634a343ea42769c246f26a43 Mon Sep 17 00:00:00 2001
From: carbon <carbon@milkv.io>
Date: Fri, 16 Jun 2023 21:55:13 +0800
Subject: [PATCH] enable LED blink

---
 .../milkv/duo/overlay/etc/init.d/S99user      |  5 +++++
 milkv/overlay/mnt/system/blink.sh             | 19 +++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100755 milkv/overlay/mnt/system/blink.sh

diff --git a/buildroot-2021.05/board/milkv/duo/overlay/etc/init.d/S99user b/buildroot-2021.05/board/milkv/duo/overlay/etc/init.d/S99user
index 74c6ca05b..25212959c 100755
--- a/buildroot-2021.05/board/milkv/duo/overlay/etc/init.d/S99user
+++ b/buildroot-2021.05/board/milkv/duo/overlay/etc/init.d/S99user
@@ -15,9 +15,14 @@ case "$1" in
 
         echo "Starting app..."
 
+        if [ -f $SYSTEMPATH/blink.sh ]; then
+                . $SYSTEMPATH/blink.sh &
+        fi
+
 	if [ -f $SYSTEMPATH/rndis.sh ]; then
                 . $SYSTEMPATH/rndis.sh &
         fi
+
         if [ -f $USERDATAPATH/auto.sh ]; then
                 usleep 30000
                 . $USERDATAPATH/auto.sh &
diff --git a/milkv/overlay/mnt/system/blink.sh b/milkv/overlay/mnt/system/blink.sh
new file mode 100755
index 000000000..4b361c064
--- /dev/null
+++ b/milkv/overlay/mnt/system/blink.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+LED_GPIO=/sys/class/gpio/gpio440
+
+if test -d $LED_GPIO; then
+    echo "GPIO440 already exported"
+else
+    echo 440 > /sys/class/gpio/export
+fi
+
+echo out > $LED_GPIO/direction
+
+while true; do
+    echo 0 > $LED_GPIO/value
+    sleep 0.5
+    echo 1 > $LED_GPIO/value
+    sleep 0.5
+done
+