/***********************************************************************
* rpiPWM1::rpiPWM1(double Hz, unsigned int cnts, double duty, unsigned int m)
* This is the overloaded constructor. First, it mmaps the registers in
* Physical memory responsible for configuring GPIO, PWM and the PWM clock.
* It then sets the frequency, PWM resolution, duty cycle & pwm mode as
* per the parameters provided.
*
* It then calls configPWM1Pin() to configure GPIO18 to ALT5 to allow it to
* output PWM1 waveforms.
* Finally configPWM1() is called to configure the PWM1 peripheral
* Parameters: - Hz (double) - Frequency
* - cnts (unsigned int) - PWM resolution (counts)
* - duty (double) - Duty Cycle as a percentage
* - m (int) - PWM mode (can be either 1 for PWMMODE (rpiPWM1::PWMMODE)
* or 2 for MSMODE (rpiPWM1::MSMODE)
***********************************************************************/
rpiPWM1::rpiPWM1(double Hz, unsigned int cnts, double duty, int m)
{
this->clk = mapRegAddr(CLOCK_BASE);
this->gpio = mapRegAddr(GPIO_BASE);
this->pwm = mapRegAddr(PWM_BASE);
if( (cnts <= 0) || (cnts > UINT_MAX) ) {
printf("counts value must be between 0-%d\n",UINT_MAX);
exit(1);
}
if ((Hz < 1e-5) || (Hz > 19200000.0f)){
printf("frequency value must be between 0-19200000\n");
exit(1);
}
if( (duty < 1e-5) || (duty> 99.99999) ) {
printf("dutyCycle value must be between 0-99.99999\n");
exit(1);
}
if( (m != PWMMODE) && (m != MSMODE) ) {
printf("mode must be either PWMMODE(1) or MSMODE(2)\n");
exit(1);
}
this->frequency = Hz;
this->counts = cnts;
this->dutyCycle = duty;
this->mode = m;
configPWM1Pin();
configPWM1();
}
/***********************************************************************
* rpiPWM1::rpiPWM1()
* This is the Default constructor. First, it mmaps the registers in
* Physical memory responsible for configuring GPIO, PWM and the PWM clock.
* It then sets the frequency to 1KHz, PWM resolution to 256, duty
* cycle to 50% & pwm mode to 'PWMMODE'
* It then calls configPWM1Pin() to configure GPIO18 to ALT5 to allow it to
* output PWM1 waveforms.
* Finally configPWM1() is called to configure the PWM1 peripheral
***********************************************************************/
rpiPWM1::rpiPWM1()
{
this->clk = mapRegAddr(CLOCK_BASE);// map PWM clock registers into memory
this->pwm = mapRegAddr(PWM_BASE); //map PWM registers into memory
this->gpio = mapRegAddr(GPIO_BASE);// map GPIO registers into memory
this->frequency = 1000.0; // set frequency
this->counts = 256; //set PWM resolution
this->dutyCycle = 50.0; //set duty cycle
this->mode = PWMMODE; // set pwm mode
configPWM1Pin(); //configure GPIO18 to ALT15 (PWM output)
configPWM1(); // configure PWM1
}
/*******************************************************************
* Default constructor....
* Simply calls mapRegAddri() function to map the physical addresses
* of the GPIO registers into local process memory
*
* Parameters - None
* Return Value - None
*******************************************************************/
mmapGpio::mmapGpio(){
this->gpio = mapRegAddr(GPIO_BASE);
}
