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Code Issues Releases Wiki Activity

🏗️ Rework STM32 timer frequency protection (#23187)

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This commit is contained in:
Tanguy Pruvot 2021-12-03 19:31:48 +01:00 committed by Scott Lahteine
parent 52a44eb200
commit d7abb891cd
2 changed files with 26 additions and 30 deletions
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41
Marlin/src/HAL/STM32/fast_pwm.cpp
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@ -25,19 +25,18 @@
#ifdef HAL_STM32
#include "../../inc/MarlinConfig.h"
#include "timers.h"
// Array to support sticky frequency sets per timer
static uint16_t timer_freq[TIMER_NUM];
void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) {
if (!PWM_PIN(pin)) return; // Don't proceed if no hardware timer
PinName pin_name = digitalPinToPinName(pin);
TIM_TypeDef *Instance = (TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM);
const PinName pin_name = digitalPinToPinName(pin);
TIM_TypeDef * const Instance = (TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM);
const uint32_t index = get_timer_index(Instance);
bool needs_freq = (HardwareTimer_Handle[index] == nullptr); // A new instance must be set to the default frequency of PWM_FREQUENCY
if (needs_freq)
const timer_index_t index = get_timer_index(Instance);
const bool needs_freq = (HardwareTimer_Handle[index] == nullptr);
if (needs_freq) // A new instance must be set to the default frequency of PWM_FREQUENCY
HardwareTimer_Handle[index]->__this = new HardwareTimer((TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM));
HardwareTimer * const HT = (HardwareTimer *)(HardwareTimer_Handle[index]->__this);
@ -46,12 +45,9 @@ void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255
if (previousMode != TIMER_OUTPUT_COMPARE_PWM1)
HT->setMode(channel, TIMER_OUTPUT_COMPARE_PWM1, pin);
if (needs_freq) {
if (timer_freq[index] == 0 ) { // If the timer is unconfigured and no freq is set then default PWM_FREQUENCY.
timer_freq[index] = PWM_FREQUENCY;
set_pwm_frequency(pin_name, timer_freq[index]); // Set the frequency and save the value to the assigned index no.
}
}
if (needs_freq && timer_freq[index] == 0) // If the timer is unconfigured and no freq is set then default PWM_FREQUENCY
set_pwm_frequency(pin_name, PWM_FREQUENCY); // Set the frequency and save the value to the assigned index no.
// Note the resolution is sticky here, the input can be upto 16 bits and that would require RESOLUTION_16B_COMPARE_FORMAT (16)
// If such a need were to manifest then we would need to calc the resolution based on the v_size parameter and add code for it.
const uint16_t value = invert ? v_size - v : v;
@ -62,23 +58,26 @@ void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255
void set_pwm_frequency(const pin_t pin, int f_desired) {
if (!PWM_PIN(pin)) return; // Don't proceed if no hardware timer
const PinName pin_name = digitalPinToPinName(pin);
TIM_TypeDef * const Instance = (TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM); // Get HAL timer instance
const uint32_t index = get_timer_index(Instance);
const timer_index_t index = get_timer_index(Instance);
// Protect used timers
if (index == MF_TIMER_TEMP || index == MF_TIMER_STEP
#if MF_TIMER_PULSE != MF_TIMER_STEP
|| index == MF_TIMER_PULSE
#endif
) return;
// Protect used timers.
#ifdef STEP_TIMER
if (index == TIMER_INDEX(STEP_TIMER)) return;
#endif
#ifdef TEMP_TIMER
if (index == TIMER_INDEX(TEMP_TIMER)) return;
#endif
#if defined(PULSE_TIMER) && MF_TIMER_PULSE != MF_TIMER_STEP
if (index == TIMER_INDEX(PULSE_TIMER)) return;
#endif
if (HardwareTimer_Handle[index] == nullptr) // If frequency is set before duty we need to create a handle here.
HardwareTimer_Handle[index]->__this = new HardwareTimer((TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM));
HardwareTimer * const HT = (HardwareTimer *)(HardwareTimer_Handle[index]->__this);
timer_freq[index] = f_desired; // Save the last frequency so duty will not set the default for this timer number.
HT->setOverflow(f_desired, HERTZ_FORMAT);
timer_freq[index] = f_desired; // Save the last frequency so duty will not set the default for this timer number.
}
#endif // HAL_STM32

15
Marlin/src/HAL/STM32/timers.h
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@ -40,17 +40,14 @@
#define hal_timer_t uint32_t
#define HAL_TIMER_TYPE_MAX UINT16_MAX
// Marlin timer_instance[] content (unrelated to timer selection)
#define NUM_HARDWARE_TIMERS 2
#define MF_TIMER_STEP 0 // Timer Index for Stepper
#define MF_TIMER_TEMP 1 // Timer Index for Temperature
#define MF_TIMER_PULSE MF_TIMER_STEP
#ifndef MF_TIMER_STEP
#define MF_TIMER_STEP 0 // Timer Index for Stepper
#endif
#ifndef MF_TIMER_PULSE
#define MF_TIMER_PULSE MF_TIMER_STEP
#endif
#ifndef MF_TIMER_TEMP
#define MF_TIMER_TEMP 1 // Timer Index for Temperature
#endif
#define TIMER_INDEX_(T) TIMER##T##_INDEX // TIMER#_INDEX enums (timer_index_t) depend on TIM#_BASE defines.
#define TIMER_INDEX(T) TIMER_INDEX_(T) // Convert Timer ID to HardwareTimer_Handle index.
#define TEMP_TIMER_FREQUENCY 1000 // Temperature::isr() is expected to be called at around 1kHz