v1.0.1 to add example `PWM_StepperControl` to demo how to control Stepper Motor using PWM #1

khoih-prog · 2023-01-22T18:21:53Z

khoih-prog
Jan 22, 2023
Maintainer

Releases v1.0.1

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

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 · 2023-01-23T20:08:52Z

Bexin3
Jan 23, 2023

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.

1 reply

khoih-prog Jan 24, 2023
Maintainer Author

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.

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v1.0.1 to add example `PWM_StepperControl` to demo how to control Stepper Motor using PWM #1

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v1.0.1 to add example PWM_StepperControl to demo how to control Stepper Motor using PWM #1

khoih-prog Jan 22, 2023 Maintainer

Releases v1.0.1

Replies: 1 comment · 1 reply

Bexin3 Jan 23, 2023

khoih-prog Jan 24, 2023 Maintainer Author

v1.0.1 to add example `PWM_StepperControl` to demo how to control Stepper Motor using PWM #1

khoih-prog
Jan 22, 2023
Maintainer

Replies: 1 comment 1 reply

Bexin3
Jan 23, 2023

khoih-prog Jan 24, 2023
Maintainer Author