From 35905ea4f971c653a3251a7e0d8399c488adbaca Mon Sep 17 00:00:00 2001
From: Alex Borro <alexborro@gmail.com>
Date: Wed, 27 Nov 2013 18:13:38 -0200
Subject: [PATCH] Allow heaters to stay full On when PWM=127

In previous version, even with PWM = 127, the system turns the FET off
and then on in the next cycle. This bevavior may increase the FET heat
dissipation.
It was fixed keeping the FET always On when PWM=127.
---
 Marlin/temperature.cpp | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index 651a81675..48960488b 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -1057,41 +1057,42 @@ ISR(TIMER0_COMPB_vect)
       #ifdef HEATERS_PARALLEL
       WRITE(HEATER_1_PIN,1);
       #endif
-    }
+    } else WRITE(HEATER_0_PIN,0);
+	
     #if EXTRUDERS > 1
     soft_pwm_1 = soft_pwm[1];
-    if(soft_pwm_1 > 0) WRITE(HEATER_1_PIN,1);
+    if(soft_pwm_1 > 0) WRITE(HEATER_1_PIN,1); else WRITE(HEATER_1_PIN,0);
     #endif
     #if EXTRUDERS > 2
     soft_pwm_2 = soft_pwm[2];
-    if(soft_pwm_2 > 0) WRITE(HEATER_2_PIN,1);
+    if(soft_pwm_2 > 0) WRITE(HEATER_2_PIN,1); else WRITE(HEATER_2_PIN,0);
     #endif
     #if defined(HEATER_BED_PIN) && HEATER_BED_PIN > -1
     soft_pwm_b = soft_pwm_bed;
-    if(soft_pwm_b > 0) WRITE(HEATER_BED_PIN,1);
+    if(soft_pwm_b > 0) WRITE(HEATER_BED_PIN,1); else WRITE(HEATER_BED_PIN,0);
     #endif
     #ifdef FAN_SOFT_PWM
     soft_pwm_fan = fanSpeedSoftPwm / 2;
-    if(soft_pwm_fan > 0) WRITE(FAN_PIN,1);
+    if(soft_pwm_fan > 0) WRITE(FAN_PIN,1); else WRITE(FAN_PIN,0);
     #endif
   }
-  if(soft_pwm_0 <= pwm_count) { 
+  if(soft_pwm_0 < pwm_count) { 
       WRITE(HEATER_0_PIN,0);
       #ifdef HEATERS_PARALLEL
       WRITE(HEATER_1_PIN,0);
       #endif
     }
   #if EXTRUDERS > 1
-  if(soft_pwm_1 <= pwm_count) WRITE(HEATER_1_PIN,0);
+  if(soft_pwm_1 < pwm_count) WRITE(HEATER_1_PIN,0);
   #endif
   #if EXTRUDERS > 2
-  if(soft_pwm_2 <= pwm_count) WRITE(HEATER_2_PIN,0);
+  if(soft_pwm_2 < pwm_count) WRITE(HEATER_2_PIN,0);
   #endif
   #if defined(HEATER_BED_PIN) && HEATER_BED_PIN > -1
-  if(soft_pwm_b <= pwm_count) WRITE(HEATER_BED_PIN,0);
+  if(soft_pwm_b < pwm_count) WRITE(HEATER_BED_PIN,0);
   #endif
   #ifdef FAN_SOFT_PWM
-  if(soft_pwm_fan <= pwm_count) WRITE(FAN_PIN,0);
+  if(soft_pwm_fan < pwm_count) WRITE(FAN_PIN,0);
   #endif
   
   pwm_count += (1 << SOFT_PWM_SCALE);