From 7b1e396d9604f9f54ff07451aed497447ea34bda Mon Sep 17 00:00:00 2001
From: Harald Barth <haba@kth.se>
Date: Tue, 8 Jul 2025 00:06:47 +0200
Subject: [PATCH] RailcomTimer not started on Uno anyway - remove it from
 compile as the optimizer is not smart enough to do it for us

---
 DCCTimerAVR.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/DCCTimerAVR.cpp b/DCCTimerAVR.cpp
index 5f828d7..288d940 100644
--- a/DCCTimerAVR.cpp
+++ b/DCCTimerAVR.cpp
@@ -61,6 +61,7 @@ void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
 
 
 void DCCTimer::startRailcomTimer(byte brakePin) {
+#if defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560)
   /* The Railcom timer is started in such a way that it 
      - First triggers 28uS after the last TIMER1 tick. 
        This provides an accurate offset (in High Accuracy mode)
@@ -113,10 +114,13 @@ void DCCTimer::startRailcomTimer(byte brakePin) {
   // it does seems to get a good answer. 
 
   TCNT2=193 + (ICR1 - TCNT1)/8;
+#endif
 }
 
 void DCCTimer::ackRailcomTimer() {
+#if defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560)
   OCR2B= 0x00;  // brake pin pwm duty cycle 0 at next tick
+#endif
 }