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Allows user to set (almost) any PWM frequency (#12638)

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This commit is contained in:
Reece Kibble
2019-03-08 16:15:42 +08:00
committed by Scott Lahteine
parent afbec5ff7e
commit dbead66988
80 changed files with 2314 additions and 28 deletions
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37
Marlin/src/module/temperature.h
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@ -266,6 +266,16 @@ class Temperature {
soft_pwm_count_fan[FAN_COUNT];
#endif
/**
* set_pwm_duty (8-bit AVRs only)
* Sets the PWM duty cycle of the provided pin to the provided value
* Optionally allows inverting the duty cycle [default = false]
* Optionally allows changing the maximum size of the provided value to enable finer PWM duty control [default = 255]
*/
#if ENABLED(FAST_PWM_FAN)
static void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size=255, const bool invert=false);
#endif
#if ENABLED(BABYSTEPPING)
static volatile int16_t babystepsTodo[3];
#endif
@ -735,8 +745,33 @@ class Temperature {
private:
/**
* (8-bit AVRs only)
*
* 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
*
* set_pwm_frequency
* Sets the frequency of the timer corresponding to the provided pin
* as close as possible to the provided desired frequency. Internally
* calculates the required waveform generation mode, prescaler and
* resolution values required and sets the timer registers accordingly.
* NOTE that the frequency is applied to all pins on the timer (Ex OC3A, OC3B and OC3B)
* NOTE that there are limitations, particularly if using TIMER2. (see Configuration_adv.h -> FAST FAN PWM Settings)
*/
#if ENABLED(FAST_PWM_FAN)
static void setPwmFrequency(const pin_t pin, int val);
typedef 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;
static Timer get_pwm_timer(const pin_t pin);
static void set_pwm_frequency(const pin_t pin, int f_desired);
#endif
static void set_current_temp_raw();