bool
Babuino::writeAnalog(uint8_t i, uint8_t value)
{
if (!digitalPinHasPWM(i)) // defined in pins_arduino.hexpected primary-expression before ‘>’ token
return false;
analogWrite(i, value);
return true;
}
void analogWrite(uint8_t pin, uint32_t val)
{
if (! digitalPinHasPWM(pin))
{
if(val > 127)
{
digitalWrite(pin, HIGH);
}
else
{
digitalWrite(pin, LOW);
}
return;
}
if (val <= 0) {
/* Use GPIO for 0% duty cycle (always off) */
pinMode(pin, OUTPUT);
digitalWrite(pin, LOW);
} else if (val >= ((1 << _writeResolution) - 1)) {
/* Use GPIO for 100% duty cycle (always on) */
pinMode(pin, OUTPUT);
digitalWrite(pin, HIGH);
} else {
/* PWM for everything in between */
PinDescription *p = &g_APinDescription[pin];
uint32_t offset;
uint32_t hcnt = (val/(float)maxResolutionValue) * pwmPeriod[p->ulPwmChan];
uint32_t lcnt = pwmPeriod[p->ulPwmChan] - hcnt;
/* Set the high count period (duty cycle) */
offset = ((p->ulPwmChan * QRK_PWM_N_LCNT2_LEN) + QRK_PWM_N_LOAD_COUNT2);
MMIO_REG_VAL(QRK_PWM_BASE_ADDR + offset) = hcnt;
/* Set the low count period (duty cycle) */
offset = ((p->ulPwmChan * QRK_PWM_N_REGS_LEN) + QRK_PWM_N_LOAD_COUNT1);
MMIO_REG_VAL(QRK_PWM_BASE_ADDR + offset) = lcnt;
/* start the PWM output */
offset = ((p->ulPwmChan * QRK_PWM_N_REGS_LEN) + QRK_PWM_N_CONTROL);
SET_MMIO_MASK(QRK_PWM_BASE_ADDR + offset, QRK_PWM_CONTROL_ENABLE);
if(pinmuxMode[pin] != PWM_MUX_MODE)
{
/* Disable pull-up and set pin mux for PWM output */
SET_PIN_PULLUP(p->ulSocPin, 0);
SET_PIN_MODE(p->ulSocPin, PWM_MUX_MODE);
pinmuxMode[pin] = PWM_MUX_MODE;
}
}
}
/**
* \brief Checks whether the DigitalOutput supports PWM or not.
*
* \returns 0 if not, 1 otherwise.
*/
int8_t DigitalOutput::supportsPWM()
{
return digitalPinHasPWM(m_Pin);
}