StepperDriver2PWM.cpp

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#include "StepperDriver2PWM.h"
 
StepperDriver2PWM::StepperDriver2PWM(int _pwm1, int _in1a, int _in1b, int _pwm2, int _in2a, int _in2b, int en1, int en2){
  // Pin initialization
  pwm1 = _pwm1; // phase 1 pwm pin number
  dir1a = _in1a; // phase 1 INA pin number
  dir1b = _in1b; // phase 1 INB pin number
  pwm2 = _pwm2; // phase 2 pwm pin number
  dir2a = _in2a; // phase 2 INA pin number
  dir2b = _in2b; // phase 2 INB pin number
 
  // enable_pin pin
  enable_pin1 = en1;
  enable_pin2 = en2;
 
  // default power-supply value
  voltage_power_supply = DEF_POWER_SUPPLY;
  voltage_limit = NOT_SET;
 
}
 
StepperDriver2PWM::StepperDriver2PWM(int _pwm1, int _dir1, int _pwm2, int _dir2, int en1, int en2){
  // Pin initialization
  pwm1 = _pwm1; // phase 1 pwm pin number
  dir1a = _dir1; // phase 1 direction pin
  pwm2 = _pwm2; // phase 2 pwm pin number
  dir2a = _dir2; // phase 2 direction pin
  // these pins are not used
  dir1b = NOT_SET;
  dir2b = NOT_SET; 
 
  // enable_pin pin
  enable_pin1 = en1;
  enable_pin2 = en2;
 
  // default power-supply value
  voltage_power_supply = DEF_POWER_SUPPLY;
  voltage_limit = NOT_SET;
 
}
 
// enable motor driver
void  StepperDriver2PWM::enable(){
    // enable_pin the driver - if enable_pin pin available
    if ( _isset(enable_pin1) ) digitalWrite(enable_pin1, HIGH);
    if ( _isset(enable_pin2) ) digitalWrite(enable_pin2, HIGH);
    // set zero to PWM
    setPwm(0,0);
}
 
// disable motor driver
void StepperDriver2PWM::disable()
{
  // set zero to PWM
  setPwm(0, 0);
  // disable the driver - if enable_pin pin available
  if ( _isset(enable_pin1) ) digitalWrite(enable_pin1, LOW);
  if ( _isset(enable_pin2) ) digitalWrite(enable_pin2, LOW);
 
}
 
// init hardware pins   
int StepperDriver2PWM::init() {
  // a bit of separation
  _delay(1000);
 
  // PWM pins
  pinMode(pwm1, OUTPUT);
  pinMode(pwm2, OUTPUT);
  pinMode(dir1a, OUTPUT);
  pinMode(dir2a, OUTPUT);
  if( _isset(dir1b) ) pinMode(dir1b, OUTPUT);
  if( _isset(dir2b) ) pinMode(dir2b, OUTPUT);
 
  if( _isset(enable_pin1) ) pinMode(enable_pin1, OUTPUT);
  if( _isset(enable_pin2) ) pinMode(enable_pin2, OUTPUT);
 
  // sanity check for the voltage limit configuration
  if( !_isset(voltage_limit)  || voltage_limit > voltage_power_supply) voltage_limit =  voltage_power_supply;
 
  // Set the pwm frequency to the pins
  // hardware specific function - depending on driver and mcu
  _configure2PWM(pwm_frequency, pwm1, pwm2);
  return 0;
}
 
 
// Set voltage to the pwm pin
void StepperDriver2PWM::setPwm(float Ua, float Ub) {  
  float duty_cycle1(0.0),duty_cycle2(0.0);
  // limit the voltage in driver
  Ua = _constrain(Ua, -voltage_limit, voltage_limit);
  Ub = _constrain(Ub, -voltage_limit, voltage_limit);
  // hardware specific writing
  duty_cycle1 = _constrain(abs(Ua)/voltage_power_supply,0.0,1.0);
  duty_cycle2 = _constrain(abs(Ub)/voltage_power_supply,0.0,1.0);
  
  // phase 1 direction
  digitalWrite(dir1a, Ua >= 0 ? LOW : HIGH);
  if( _isset(dir1b) ) digitalWrite(dir1b, Ua <= 0 ? LOW : HIGH);
  // phase 2 direction
  digitalWrite(dir2a, Ub >= 0 ? LOW : HIGH);
  if( _isset(dir2b) ) digitalWrite(dir2b, Ub <= 0 ? LOW : HIGH);
  
  // write to hardware
  _writeDutyCycle2PWM(duty_cycle1, duty_cycle2, pwm1, pwm2);
}