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@ -30,30 +30,35 @@ |
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static uint16_t timer_freq[TIMER_NUM]; |
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void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) { |
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if (!PWM_PIN(pin)) return; // Don't proceed if no hardware timer
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const PinName pin_name = digitalPinToPinName(pin); |
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TIM_TypeDef * const Instance = (TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM); |
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const uint16_t duty = invert ? v_size - v : v; |
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if (PWM_PIN(pin)) { |
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const PinName pin_name = digitalPinToPinName(pin); |
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TIM_TypeDef * const Instance = (TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM); |
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const timer_index_t index = get_timer_index(Instance); |
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const bool needs_freq = (HardwareTimer_Handle[index] == nullptr); |
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if (needs_freq) // A new instance must be set to the default frequency of PWM_FREQUENCY
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HardwareTimer_Handle[index]->__this = new HardwareTimer((TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM)); |
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const timer_index_t index = get_timer_index(Instance); |
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const bool needs_freq = (HardwareTimer_Handle[index] == nullptr); |
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if (needs_freq) // A new instance must be set to the default frequency of PWM_FREQUENCY
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HardwareTimer_Handle[index]->__this = new HardwareTimer((TIM_TypeDef *)pinmap_peripheral(pin_name, PinMap_PWM)); |
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HardwareTimer * const HT = (HardwareTimer *)(HardwareTimer_Handle[index]->__this); |
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const uint32_t channel = STM_PIN_CHANNEL(pinmap_function(pin_name, PinMap_PWM)); |
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const TimerModes_t previousMode = HT->getMode(channel); |
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if (previousMode != TIMER_OUTPUT_COMPARE_PWM1) |
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HT->setMode(channel, TIMER_OUTPUT_COMPARE_PWM1, pin); |
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HardwareTimer * const HT = (HardwareTimer *)(HardwareTimer_Handle[index]->__this); |
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const uint32_t channel = STM_PIN_CHANNEL(pinmap_function(pin_name, PinMap_PWM)); |
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const TimerModes_t previousMode = HT->getMode(channel); |
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if (previousMode != TIMER_OUTPUT_COMPARE_PWM1) |
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HT->setMode(channel, TIMER_OUTPUT_COMPARE_PWM1, pin); |
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if (needs_freq && timer_freq[index] == 0) // If the timer is unconfigured and no freq is set then default PWM_FREQUENCY
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set_pwm_frequency(pin_name, PWM_FREQUENCY); // Set the frequency and save the value to the assigned index no.
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if (needs_freq && timer_freq[index] == 0) // If the timer is unconfigured and no freq is set then default PWM_FREQUENCY
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set_pwm_frequency(pin_name, PWM_FREQUENCY); // Set the frequency and save the value to the assigned index no.
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// Note the resolution is sticky here, the input can be upto 16 bits and that would require RESOLUTION_16B_COMPARE_FORMAT (16)
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// 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.
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const uint16_t value = invert ? v_size - v : v; |
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HT->setCaptureCompare(channel, value, RESOLUTION_8B_COMPARE_FORMAT); // Sets the duty, the calc is done in the library :)
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pinmap_pinout(pin_name, PinMap_PWM); // Make sure the pin output state is set.
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if (previousMode != TIMER_OUTPUT_COMPARE_PWM1) HT->resume(); |
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// Note the resolution is sticky here, the input can be upto 16 bits and that would require RESOLUTION_16B_COMPARE_FORMAT (16)
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// 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.
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HT->setCaptureCompare(channel, duty, RESOLUTION_8B_COMPARE_FORMAT); // Set the duty, the calc is done in the library :)
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pinmap_pinout(pin_name, PinMap_PWM); // Make sure the pin output state is set.
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if (previousMode != TIMER_OUTPUT_COMPARE_PWM1) HT->resume(); |
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} |
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else { |
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pinMode(pin, OUTPUT); |
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digitalWrite(pin, duty < v_size / 2 ? LOW : HIGH); |
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} |
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} |
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void set_pwm_frequency(const pin_t pin, const uint16_t f_desired) { |
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