From 81b7c47203b7558cc634ab2b22f966aa4bbc9ce1 Mon Sep 17 00:00:00 2001
From: lbernstone <lbernstone@gmail.com>
Date: Thu, 15 Apr 2021 03:46:53 -0600
Subject: [PATCH] Serial::end hang (#5047)

workaround for #5043. There is a timing issue with HardwareSerial::end. I'm not sure what is hung, but it should be possible to see this in jtag, as it does cause a reboot if you let it. The delay needs to be before you detach the device!?
---
 cores/esp32/HardwareSerial.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cores/esp32/HardwareSerial.cpp b/cores/esp32/HardwareSerial.cpp
index 9e6a675c..7eb75354 100644
--- a/cores/esp32/HardwareSerial.cpp
+++ b/cores/esp32/HardwareSerial.cpp
@@ -117,6 +117,7 @@ void HardwareSerial::end()
     if(uartGetDebug() == _uart_nr) {
         uartSetDebug(0);
     }
+    delay(10);
     log_v("pins %d %d",_tx_pin, _rx_pin);
     uartEnd(_uart, _tx_pin, _rx_pin);
     _uart = 0;