From 5489ddccab2e334a290c11bbe0d6c1ab1d0c0272 Mon Sep 17 00:00:00 2001
From: Markus Hitter <mah@jump-ing.de>
Date: Mon, 13 Jul 2015 12:56:20 +0200
Subject: [PATCH] heater.c: set up timer 2 only when present.

This was found by running the new regression tests. ...and seeing
that this is pretty old code, I wonder how Teacup could ever
compile for the Teensy2 guys.
---
 heater.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/heater.c b/heater.c
index 9f34db6..072ad45 100644
--- a/heater.c
+++ b/heater.c
@@ -117,15 +117,17 @@ void heater_init() {
 
 	// timer 1 is used for stepping
 
-	TCCR2A = MASK(WGM21) | MASK(WGM20);
-	// PWM frequencies in TCCR2B, see page 156 of the ATmega644 reference.
-	TCCR2B = MASK(CS20); // F_CPU / 256  (about 78(62.5) kHz on a 20(16) MHz chip)
-	#ifndef FAST_PWM
-		TCCR2B = MASK(CS20) | MASK(CS21) | MASK(CS22); // F_CPU / 256 / 1024
-	#endif
-	TIMSK2 = 0;
-	OCR2A = 0;
-	OCR2B = 0;
+  #ifdef TCCR2A
+    TCCR2A = MASK(WGM21) | MASK(WGM20);
+    // PWM frequencies in TCCR2B, see page 156 of the ATmega644 reference.
+    TCCR2B = MASK(CS20); // F_CPU / 256  (about 78(62.5) kHz on a 20(16) MHz chip)
+    #ifndef FAST_PWM
+      TCCR2B = MASK(CS20) | MASK(CS21) | MASK(CS22); // F_CPU / 256 / 1024
+    #endif
+    TIMSK2 = 0;
+    OCR2A = 0;
+    OCR2B = 0;
+  #endif
 
 	#ifdef	TCCR3A
 		TCCR3A = MASK(WGM30);
@@ -180,12 +182,14 @@ void heater_init() {
 				case (uint16_t) &OCR0B:
 					TCCR0A |= MASK(COM0B1);
 					break;
+        #ifdef TCCR2A
 				case (uint16_t) &OCR2A:
 					TCCR2A |= MASK(COM2A1);
 					break;
 				case (uint16_t) &OCR2B:
 					TCCR2A |= MASK(COM2B1);
 					break;
+        #endif
 				#ifdef TCCR3A
 				case (uint16_t) &OCR3AL:
 					TCCR3A |= MASK(COM3A1);