v1.0.1 to add example PWM_StepperControl to demo how to control Stepper Motor using PWM

[khoih-prog]

Releases v1.0.1

1. Add example PWM_StepperControl to demo how to control Stepper Motor using PWM. Check Using PWM to step a stepper driver #16

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This discussion was created from the release v1.0.1 to add example `PWM_StepperControl` to demo how to control Stepper Motor using PWM.

[Bexin3]

Hi, I was wondering if you could make a separate faster duty cycle change function, I made one in my Speeduino library inspired on your library, and it allows for a few microsecond taking duty cycle change, which allows for analog to pwm conversions at over 100khz and such.

[khoih-prog]

There is already a more efficient function designed specifically for this faster duty cycle change function

SAMD_PWM/src/SAMD_PWM.h

Lines 855 to 917 in cdf0261

	// Must have same frequency
	bool setPWM_manual(const uint8_t& pin, const uint16_t& DCValue)
	{
	// Not the same pin or overvalue
	if ( (_pin != pin) || (DCValue >= (1 << _resolution) ) )
	return false;
	#if defined(__SAMD51__)
	// Check which timer to use
	if (_tcNum >= TCC_INST_NUM)
	{
	Tc* TCx = (Tc*) GetTC(_pinDesc.ulPWMChannel);
	// Set the DC value, 8-bit
	//TCx->COUNT8.CC[_tcChannel].reg = (DCValue * _compareValue / 100) >> 8;
	//while (TCx->COUNT16.STATUS.bit.SYNCBUSY);
	// Set the Dutycycle
	TCx->COUNT8.CC[_tcChannel].reg = (DCValue * _compareValue / 100) >> 8;
	while (TCx->COUNT8.SYNCBUSY.bit.CC0);
	PWM_LOGDEBUG3(F("setPWM_manual TC: DCValue ="), DCValue, F(", _frequency ="), _frequency);
	PWM_LOGDEBUG3(F("setPWM_manual TC: New DCValue ="), DCValue * _compareValue / 100, F(", _compareValue ="),
	_compareValue);
	}
	#else
	// Check which timer to use
	if (_tcNum >= TCC_INST_NUM)
	{
	Tc* TCx = (Tc*) GetTC(_pinDesc.ulPWMChannel);
	// Set the DC value, 8-bit
	TCx->COUNT8.CC[_tcChannel].reg = (DCValue * _compareValue / 100) >> 8;
	while (TCx->COUNT16.STATUS.bit.SYNCBUSY);
	PWM_LOGDEBUG3(F("setPWM_manual TC: DCValue ="), DCValue, F(", _frequency ="), _frequency);
	PWM_LOGDEBUG3(F("setPWM_manual TC: New DCValue ="), DCValue * _compareValue / 100, F(", _compareValue ="),
	_compareValue);
	}
	#endif
	else
	{
	Tcc* TCCx = (Tcc*) GetTC(_pinDesc.ulPWMChannel);
	// DCValue from 0-100
	TCCx->CC[_tcChannel].reg = DCValue * _compareValue / 100;
	while (TCCx->SYNCBUSY.reg & TCC_SYNCBUSY_MASK);
	PWM_LOGDEBUG3(F("setPWM_manual TCC: DCValue ="), DCValue, F(", _frequency ="), _frequency);
	PWM_LOGDEBUG3(F("setPWM_manual TCC: New DCValue ="), DCValue * _compareValue / 100, F(", _compareValue ="),
	_compareValue);
	}
	_dutycycle = DCValue * _compareValue / 100;
	return true;
	}
	///////////////////////////////////////////

Just use it at the right time (fixed frequency, dynamic DC).

You certainly have to disable debug printing in high freq use-cases.