diff --git a/cores/arduino/wiring_digital.c b/cores/arduino/wiring_digital.c
index 5840435c1a..4141772835 100644
--- a/cores/arduino/wiring_digital.c
+++ b/cores/arduino/wiring_digital.c
@@ -78,17 +78,25 @@ void pinMode(uint32_t ulPin, uint32_t ulMode)
void digitalWrite(uint32_t ulPin, uint32_t ulVal)
{
- digitalWriteFast(digitalPinToPinName(ulPin), ulVal);
+ PinName p = digitalPinToPinName(ulPin);
+ if (p != NC) {
+ digitalWriteFast(p, ulVal);
+ }
}
int digitalRead(uint32_t ulPin)
{
- return digitalReadFast(digitalPinToPinName(ulPin));
+ PinName p = digitalPinToPinName(ulPin);
+
+ return (p == NC) ? 0 : digitalReadFast(p);
}
void digitalToggle(uint32_t ulPin)
{
- digitalToggleFast(digitalPinToPinName(ulPin));
+ PinName p = digitalPinToPinName(ulPin);
+ if (p != NC) {
+ digitalToggleFast(digitalPinToPinName(ulPin));
+ }
}
#ifdef __cplusplus
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