From 69af392554718a14cceef2d9271a6b461dac58a4 Mon Sep 17 00:00:00 2001
From: Erik van der Zalm <erik@vdzalm.eu>
Date: Sun, 17 Nov 2013 13:29:02 +0100
Subject: [PATCH] Added HEATERS_PARALLEL (Request from reifsnyderb) This allows
a hot end with two heaters and a FET for each heater. This is useful if the
FET is not capable of heating two heaters.
---
Marlin/Configuration_adv.h | 7 +++++++
Marlin/temperature.cpp | 16 +++++++++++++---
2 files changed, 20 insertions(+), 3 deletions(-)
diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index 246eb3252e..103bb538f0 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -365,6 +365,9 @@ const unsigned int dropsegments=5; //everything with less than this number of st
#define PS_ON_ASLEEP LOW
#endif
+// Control heater 0 and heater 1 in parallel.
+#define HEATERS_PARALLEL
+
//===========================================================================
//=============================Buffers ============================
//===========================================================================
@@ -418,6 +421,10 @@ const unsigned int dropsegments=5; //everything with less than this number of st
#error "You cannot use TEMP_SENSOR_1_AS_REDUNDANT if EXTRUDERS > 1"
#endif
+#if EXTRUDERS > 1 && defined HEATERS_PARALLEL
+ #error "You cannot use HEATERS_PARALLEL if EXTRUDERS > 1"
+#endif
+
#if TEMP_SENSOR_0 > 0
#define THERMISTORHEATER_0 TEMP_SENSOR_0
#define HEATER_0_USES_THERMISTOR
diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index decab104d5..651a816752 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -1040,7 +1040,7 @@ ISR(TIMER0_COMPB_vect)
static unsigned char temp_state = 0;
static unsigned char pwm_count = (1 << SOFT_PWM_SCALE);
static unsigned char soft_pwm_0;
- #if EXTRUDERS > 1
+ #if (EXTRUDERS > 1) || defined(HEATERS_PARALLEL)
static unsigned char soft_pwm_1;
#endif
#if EXTRUDERS > 2
@@ -1052,7 +1052,12 @@ ISR(TIMER0_COMPB_vect)
if(pwm_count == 0){
soft_pwm_0 = soft_pwm[0];
- if(soft_pwm_0 > 0) WRITE(HEATER_0_PIN,1);
+ if(soft_pwm_0 > 0) {
+ WRITE(HEATER_0_PIN,1);
+ #ifdef HEATERS_PARALLEL
+ WRITE(HEATER_1_PIN,1);
+ #endif
+ }
#if EXTRUDERS > 1
soft_pwm_1 = soft_pwm[1];
if(soft_pwm_1 > 0) WRITE(HEATER_1_PIN,1);
@@ -1070,7 +1075,12 @@ ISR(TIMER0_COMPB_vect)
if(soft_pwm_fan > 0) WRITE(FAN_PIN,1);
#endif
}
- if(soft_pwm_0 <= pwm_count) WRITE(HEATER_0_PIN,0);
+ 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);
#endif