Fix digitalPinToPinName and pinNametoDigitalPin

digitalPinToPinName: deals only with pin number.
pinNametoDigitalPin: chek if PinName is a valid one

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/pins_arduino.c

@@ -26,10 +26,12 @@ void __libc_init_array(void);
 
 WEAK uint32_t pinNametoDigitalPin(PinName p)
 {
-  uint32_t i = 0;
-  for(i = 0; i < NUM_DIGITAL_PINS; i++) {
-	  if (digitalPin[i] == p)
-		  break;
+  uint32_t i = NC;
+  if(STM_VALID_PINNAME(p)) {
+    for(i = 0; i < NUM_DIGITAL_PINS; i++) {
+      if (digitalPin[i] == p)
+        break;
+    }
   }
   return i;
 }

cores/arduino/pins_arduino.h

@@ -39,7 +39,7 @@ extern "C" {
 
 // Convert a digital pin number Dxx to a PinName Pxy
 // Note: Analog pin is also a digital pin.
-#define digitalPinToPinName(p)     ((p < NUM_DIGITAL_PINS) ? digitalPin[p] : (STM_VALID_PINNAME(p))? (PinName)p : NC)
+#define digitalPinToPinName(p)     ((p < NUM_DIGITAL_PINS) ? digitalPin[p] : NC)
 // Convert a PinName Pxy to a digital pin number
 uint32_t pinNametoDigitalPin(PinName p);