From 3475fd7b0fc1da787368c2a40b58815180fdd637 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Sat, 13 Aug 2016 19:57:33 -0700
Subject: [PATCH] Init PWM-able auto fan pins with `SET_OUTPUT`

---
 Marlin/temperature.cpp | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index 96b4d42a4b..4c4c0bb4cd 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -1068,16 +1068,44 @@ void Temperature::init() {
   #endif
 
   #if HAS_AUTO_FAN_0
-    pinMode(EXTRUDER_0_AUTO_FAN_PIN, OUTPUT);
+    #if EXTRUDER_0_AUTO_FAN_PIN == FAN1_PIN
+      SET_OUTPUT(EXTRUDER_0_AUTO_FAN_PIN);
+      #if ENABLED(FAST_PWM_FAN)
+        setPwmFrequency(EXTRUDER_0_AUTO_FAN_PIN, 1); // No prescaling. Pwm frequency = F_CPU/256/8
+      #endif
+    #else
+      pinMode(EXTRUDER_0_AUTO_FAN_PIN, OUTPUT);
+    #endif
   #endif
   #if HAS_AUTO_FAN_1 && (EXTRUDER_1_AUTO_FAN_PIN != EXTRUDER_0_AUTO_FAN_PIN)
-    pinMode(EXTRUDER_1_AUTO_FAN_PIN, OUTPUT);
+    #if EXTRUDER_1_AUTO_FAN_PIN == FAN1_PIN
+      SET_OUTPUT(EXTRUDER_1_AUTO_FAN_PIN);
+      #if ENABLED(FAST_PWM_FAN)
+        setPwmFrequency(EXTRUDER_1_AUTO_FAN_PIN, 1); // No prescaling. Pwm frequency = F_CPU/256/8
+      #endif
+    #else
+      pinMode(EXTRUDER_1_AUTO_FAN_PIN, OUTPUT);
+    #endif
   #endif
   #if HAS_AUTO_FAN_2 && (EXTRUDER_2_AUTO_FAN_PIN != EXTRUDER_0_AUTO_FAN_PIN) && (EXTRUDER_2_AUTO_FAN_PIN != EXTRUDER_1_AUTO_FAN_PIN)
-    pinMode(EXTRUDER_2_AUTO_FAN_PIN, OUTPUT);
+    #if EXTRUDER_2_AUTO_FAN_PIN == FAN1_PIN
+      SET_OUTPUT(EXTRUDER_2_AUTO_FAN_PIN);
+      #if ENABLED(FAST_PWM_FAN)
+        setPwmFrequency(EXTRUDER_2_AUTO_FAN_PIN, 1); // No prescaling. Pwm frequency = F_CPU/256/8
+      #endif
+    #else
+      pinMode(EXTRUDER_2_AUTO_FAN_PIN, OUTPUT);
+    #endif
   #endif
   #if HAS_AUTO_FAN_3 && (EXTRUDER_3_AUTO_FAN_PIN != EXTRUDER_0_AUTO_FAN_PIN) && (EXTRUDER_3_AUTO_FAN_PIN != EXTRUDER_1_AUTO_FAN_PIN) && (EXTRUDER_3_AUTO_FAN_PIN != EXTRUDER_2_AUTO_FAN_PIN)
-    pinMode(EXTRUDER_3_AUTO_FAN_PIN, OUTPUT);
+    #if EXTRUDER_3_AUTO_FAN_PIN == FAN1_PIN
+      SET_OUTPUT(EXTRUDER_3_AUTO_FAN_PIN);
+      #if ENABLED(FAST_PWM_FAN)
+        setPwmFrequency(EXTRUDER_3_AUTO_FAN_PIN, 1); // No prescaling. Pwm frequency = F_CPU/256/8
+      #endif
+    #else
+      pinMode(EXTRUDER_3_AUTO_FAN_PIN, OUTPUT);
+    #endif
   #endif
 
   // Use timer0 for temperature measurement