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Fix: Clean-up previous state when alternating between GPIO and PWM functionality. #620

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Fix: Clean-up previous state when alternating between GPIO and PWM functionality. #620

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11 changes: 11 additions & 0 deletions cores/arduino/wiring_analog.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,17 @@ void analogWrite(pin_size_t pin, int val)
#endif
float percent = (float)val/(float)((1 << write_resolution)-1);
mbed::PwmOut* pwm = digitalPinToPwm(pin);

/* Check if this pin has been previously configured as a GPIO pin.
* If it has, delete the GPIO allocation as well as the PWM allocation
* to enforce a full re-initialisation of the PWM module.
*/
mbed::DigitalInOut * gpio = digitalPinToGpio(pin);
if ((gpio != NULL) && (pwm != NULL)) {
delete gpio; gpio = NULL; digitalPinToGpio(pin) = NULL;
delete pwm; pwm = NULL; digitalPinToPwm(pin) = NULL;
}

if (pwm == NULL) {
pwm = new mbed::PwmOut(digitalPinToPinName(pin));
digitalPinToPwm(pin) = pwm;
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11 changes: 11 additions & 0 deletions cores/arduino/wiring_digital.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,17 @@ void digitalWrite(pin_size_t pin, PinStatus val)
return;
}
mbed::DigitalInOut* gpio = digitalPinToGpio(pin);

/* Check if this pin has been previously configured as a PWM pin.
* If it has, delete the GPIO allocation as well as the PWM allocation
* to enforce a full re-initialisation of the GPIO module.
*/
mbed::PwmOut * pwm = digitalPinToPwm(pin);
if ((gpio != NULL) && (pwm != NULL)) {
delete gpio; gpio = NULL; digitalPinToGpio(pin) = NULL;
delete pwm; pwm = NULL; digitalPinToPwm(pin) = NULL;
}

if (gpio == NULL) {
gpio = new mbed::DigitalInOut(digitalPinToPinName(pin), PIN_OUTPUT, PullNone, val);
digitalPinToGpio(pin) = gpio;
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