Clean up fast_pwm.cpp

Marlin/src/HAL/HAL_AVR/fast_pwm.cpp

@@ -1,26 +1,47 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
 #ifdef __AVR__
 
 #include "../../inc/MarlinConfigPre.h"
-/**
- * get_pwm_timer
- *  Grabs timer information and registers of the provided pin
- *  returns Timer struct containing this information
- *  Used by set_pwm_frequency, set_pwm_duty
- *
- */
 
 #if ENABLED(FAST_PWM_FAN)
+
 #include "HAL.h"
 
-  struct Timer {
+struct Timer {
   volatile uint8_t* TCCRnQ[3];  // max 3 TCCR registers per timer
   volatile uint16_t* OCRnQ[3];  // max 3 OCR registers per timer
   volatile uint16_t* ICRn;      // max 1 ICR register per timer
   uint8_t n;                    // the timer number [0->5]
   uint8_t q;                    // the timer output [0->2] (A->C)
-  };
+};
 
-  Timer get_pwm_timer(pin_t pin) {
+/**
+ * get_pwm_timer
+ *  Get the timer information and register of the provided pin.
+ *  Return a Timer struct containing this information.
+ *  Used by set_pwm_frequency, set_pwm_duty
+ */
+Timer get_pwm_timer(const pin_t pin) {
   uint8_t q = 0;
   switch (digitalPinToTimer(pin)) {
     // Protect reserved timers (TIMER0 & TIMER1)
@@ -117,9 +138,9 @@
                     0, 0
   };
   return timer;
-  }
+}
 
-  void set_pwm_frequency(const pin_t pin, int f_desired) {
+void set_pwm_frequency(const pin_t pin, int f_desired) {
   Timer timer = get_pwm_timer(pin);
   if (timer.n == 0) return; // Don't proceed if protected timer or not recognised
   uint16_t size;
@@ -209,9 +230,9 @@
   }
   else
     _SET_ICRn(timer.ICRn, res);         // Set ICRn value (TOP) = res
-  }
+}
 
-  void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) {
+void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) {
   // If v is 0 or v_size (max), digitalWrite to LOW or HIGH.
   // Note that digitalWrite also disables pwm output for us (sets COM bit to 0)
   if (v == 0)
@@ -244,7 +265,7 @@
 
     _SET_OCRnQ(timer.OCRnQ, timer.q, v * float(top / v_size)); // Scale 8/16-bit v to top value
   }
-  }
+}
 
 #endif // FAST_PWM_FAN
 #endif // __AVR__