From d1db51830b90241e0f5f0b6259ae0d027c5e5fd1 Mon Sep 17 00:00:00 2001
From: Todd Herbert <herbert.todd@gmail.com>
Date: Thu, 4 Apr 2024 17:05:12 +1300
Subject: [PATCH] set GPIOs for sleep

---
 src/sleep.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/sleep.cpp b/src/sleep.cpp
index ddea9942c..67b7f5c7c 100644
--- a/src/sleep.cpp
+++ b/src/sleep.cpp
@@ -277,6 +277,17 @@ void doDeepSleep(uint32_t msecToWake, bool skipPreflight = false)
     if (shouldLoraWake(msecToWake)) {
         enableLoraInterrupt();
     }
+
+#if defined(HELTEC_WIRELESS_PAPER) || defined(HELTEC_WIRELESS_PAPER_V1_0) // Applicable to most ESP32 boards?
+    // Avoid leakage through button pin
+    pinMode(0, INPUT);
+    rtc_gpio_hold_en((gpio_num_t)0);
+
+    // LoRa CS (RADIO_NSS) needs to stay HIGH, even during deep sleep
+    pinMode(LORA_CS, OUTPUT);
+    digitalWrite(LORA_CS, HIGH);
+    rtc_gpio_hold_en((gpio_num_t)LORA_CS);
+#endif
 #endif
     cpuDeepSleep(msecToWake);
 }