From 96f47bf44f732de93e3277315c8b7e15df3c4cba Mon Sep 17 00:00:00 2001
From: Harald Barth <haba@kth.se>
Date: Fri, 25 Nov 2022 10:48:18 +0100
Subject: [PATCH] protect analogvals read from interrupt

---
 DCCTimerAVR.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/DCCTimerAVR.cpp b/DCCTimerAVR.cpp
index d98d3d4..043edfb 100644
--- a/DCCTimerAVR.cpp
+++ b/DCCTimerAVR.cpp
@@ -169,9 +169,13 @@ int16_t ADCee::ADCmax() {
 int ADCee::read(uint8_t pin, bool fromISR) {
   (void)fromISR; // AVR does ignore this arg
   uint8_t id = pin - A0;
+  int a;
   // we do not need to check (analogvals == NULL)
   // because usedpins would still be 0 in that case
-  return analogvals[id];
+  noInterrupts();
+  a = analogvals[id];
+  interrupts();
+  return a;
 }
 /*
  * Scan function that is called from interrupt