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Clean up fast_pwm.cpp

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This commit is contained in:
Scott Lahteine 2019-05-25 22:49:54 -05:00
parent 49229d97db
commit 47fd74a98d
1 changed files with 235 additions and 214 deletions
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51
Marlin/src/HAL/HAL_AVR/fast_pwm.cpp
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@ -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__ #ifdef __AVR__
#include "../../inc/MarlinConfigPre.h" #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) #if ENABLED(FAST_PWM_FAN)
#include "HAL.h" #include "HAL.h"
struct Timer { struct Timer {
volatile uint8_t* TCCRnQ[3]; // max 3 TCCR registers per 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* OCRnQ[3]; // max 3 OCR registers per timer
volatile uint16_t* ICRn; // max 1 ICR register per timer volatile uint16_t* ICRn; // max 1 ICR register per timer
uint8_t n; // the timer number [0->5] uint8_t n; // the timer number [0->5]
uint8_t q; // the timer output [0->2] (A->C) 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; uint8_t q = 0;
switch (digitalPinToTimer(pin)) { switch (digitalPinToTimer(pin)) {
// Protect reserved timers (TIMER0 & TIMER1) // Protect reserved timers (TIMER0 & TIMER1)
@ -117,9 +138,9 @@
0, 0 0, 0
}; };
return timer; 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); Timer timer = get_pwm_timer(pin);
if (timer.n == 0) return; // Don't proceed if protected timer or not recognised if (timer.n == 0) return; // Don't proceed if protected timer or not recognised
uint16_t size; uint16_t size;
@ -209,9 +230,9 @@
} }
else else
_SET_ICRn(timer.ICRn, res); // Set ICRn value (TOP) = res _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. // 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) // Note that digitalWrite also disables pwm output for us (sets COM bit to 0)
if (v == 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 _SET_OCRnQ(timer.OCRnQ, timer.q, v * float(top / v_size)); // Scale 8/16-bit v to top value
} }
} }
#endif // FAST_PWM_FAN #endif // FAST_PWM_FAN
#endif // __AVR__ #endif // __AVR__