From 912704a0d85fdcdbe4f9783a9e007f6e83c11dab Mon Sep 17 00:00:00 2001
From: Sebastianv650 <sebastian_v650@kabelmail.de>
Date: Sun, 20 Nov 2016 18:17:42 +0100
Subject: [PATCH] Enable ISRs inside temperature ISR

to capture chars at UART at 250000 baud.
---
 Marlin/temperature.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index f01c0862b..4895d1da9 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -1489,6 +1489,9 @@ void Temperature::set_current_temp_raw() {
 ISR(TIMER0_COMPB_vect) { Temperature::isr(); }
 
 void Temperature::isr() {
+  //Allow UART and stepper ISRs
+  CBI(TIMSK0, OCIE0B); //Disable Temperature ISR
+  sei();
 
   static uint8_t temp_count = 0;
   static TempState temp_state = StartupDelay;
@@ -1940,4 +1943,6 @@ void Temperature::isr() {
       if (!endstop_monitor_count) endstop_monitor();  // report changes in endstop status
     }
   #endif
+  
+  SBI(TIMSK0, OCIE0B); //re-enable Temperature ISR
 }