Add macro helper to support Firmata

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

Author: fpistm

cores/arduino/pins_arduino.c

@@ -67,6 +67,42 @@ PinName analogInputToPinName(uint32_t pin)
   return pn;
 }
 
+bool pinIsAnalogInput(uint32_t pin)
+{
+  bool ret = false;
+#if NUM_ANALOG_INPUTS > 0
+#ifndef NUM_ANALOG_LAST
+  ret = (pin >= A0) && (pin < (A0 + NUM_ANALOG_INPUTS));
+#else
+  for (uint32_t i = 0; i < NUM_ANALOG_INPUTS; i++) {
+    if (analogInPin[i] == pin) {
+      ret = true;
+      break;
+    }
+  }
+#endif /* NUM_ANALOG_LAST */
+#endif /* NUM_ANALOG_INPUTS > 0 */
+  return ret;
+}
+
+uint32_t digitalPinToAnalogInput(uint32_t pin)
+{
+  uint32_t ret = NUM_ANALOG_INPUTS;
+#if NUM_ANALOG_INPUTS > 0
+#ifndef NUM_ANALOG_LAST
+  ret = pin - A0;
+#else
+  for (uint32_t i = 0; i < NUM_ANALOG_INPUTS; i++) {
+    if (analogInPin[i] == pin) {
+      ret = i;
+      break;
+    }
+  }
+#endif /* NUM_ANALOG_LAST */
+#endif /* NUM_ANALOG_INPUTS > 0 */
+  return ret;
+}
+
 #ifdef __cplusplus
 }
 #endif

cores/arduino/pins_arduino.h

@@ -17,6 +17,7 @@
 */
 #ifndef _PINS_ARDUINO_H_
 #define _PINS_ARDUINO_H_
+#include <stdbool.h>
 #include <stdlib.h> /* Required for static_assert */
 // Include board variant
 #include "variant.h"
@@ -323,12 +324,15 @@ PinName analogInputToPinName(uint32_t pin);
 // return first occurence of linked PinName (PYx)
 #define digitalPinFirstOccurence(p) (pinNametoDigitalPin(digitalPinToPinName(p)))
 
-// Specific for Firmata. As some pins could be duplicated,
-// ensure 'p' is not one of the serial pins
+// Specific for Firmata.
+// Some pins could be duplicated, ensure 'p' is not one of the serial pins
 #if defined(PIN_SERIAL_RX) && defined(PIN_SERIAL_TX)
 #define pinIsSerial(p)              ((digitalPinFirstOccurence(p) == PIN_SERIAL_RX) ||\
                                      (digitalPinFirstOccurence(p) == PIN_SERIAL_TX))
 #endif
+// Convenient macro to handle Analog
+bool pinIsAnalogInput(uint32_t pin);
+uint32_t digitalPinToAnalogInput(uint32_t pin);
 
 #ifdef __cplusplus
 }