Add dummy analogReference() for compatibility

Reference: https://www.arduino.cc/reference/en/language/functions/analog-io/analogreference/ Same as Arduino SAM Boards (Due) Fix #403 Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
stm32duino · Jun 5, 2019 · dbf538e · dbf538e
1 parent 37fc844
commit dbf538e
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diff --git a/cores/arduino/wiring_analog.c b/cores/arduino/wiring_analog.c
@@ -59,6 +59,10 @@ static inline uint32_t mapResolution(uint32_t value, uint32_t from, uint32_t to)
   }
 }
 
+void analogReference(eAnalogReference ulMode)
+{
+  UNUSED(ulMode);
+}
 
 //perform the read operation on the selected analog pin.
 //the initialization of the analog PIN is done through this function

diff --git a/cores/arduino/wiring_analog.h b/cores/arduino/wiring_analog.h
@@ -25,6 +25,7 @@ extern "C" {
 
 /*
  * \brief SAM3 products have only one reference for ADC
+ * This is kept only for compatibility with existing AVR based API.
  */
 typedef enum _eAnalogReference {
   AR_DEFAULT,