Giga: add pins A8-A11 as pure analog

Author: facchinm

variants/GIGA/pins_arduino.h

@@ -56,6 +56,10 @@ static const uint8_t A12  = PIN_A12;
 static const uint8_t A13  = PIN_A13;
 #define ADC_RESOLUTION 12
 
+#ifdef __cplusplus
+#include "pure_analog_pins.h"
+#endif
+
 //DACs
 #define DAC           1
 

variants/GIGA/pure_analog_pins.cpp

@@ -0,0 +1,20 @@
+#include "pure_analog_pins.h"
+#include "AnalogIn.h"
+#include "pinDefinitions.h"
+
+PureAnalogPin  A8(8);
+PureAnalogPin  A9(9);
+PureAnalogPin  A10(10);
+PureAnalogPin  A11(11);
+
+int getAnalogReadResolution();
+
+int analogRead(PureAnalogPin pin) {
+  mbed::AnalogIn* adc = g_AAnalogPinDescription[pin.get()].adc;
+  auto name = g_AAnalogPinDescription[pin.get()].name;
+  if (adc == NULL) {
+    adc = new mbed::AnalogIn(name);
+    g_AAnalogPinDescription[pin.get()].adc = adc;
+  }
+  return (adc->read_u16() >> (16 - getAnalogReadResolution()));
+}

variants/GIGA/pure_analog_pins.h

@@ -0,0 +1,52 @@
+#ifndef _PURE_ANALOG_PINS_
+#define _PURE_ANALOG_PINS_
+
+/******************************************************************************
+ * INCLUDE
+ ******************************************************************************/
+
+#include "Arduino.h"
+
+/******************************************************************************
+ * PREPROCESSOR-MAGIC
+ ******************************************************************************/
+
+#define PURE_ANALOG_AS_DIGITAL_ATTRIBUTE __attribute__ ((error("Can't use pins A8-A11 as digital")))
+
+/******************************************************************************
+ * TYPEDEF
+ ******************************************************************************/
+
+class PureAnalogPin {
+public:
+	PureAnalogPin(int _pin) : pin(_pin) {};
+	int get() {
+		return pin;
+	};
+	bool operator== (PureAnalogPin const & other) const {
+		return pin == other.pin;
+	}
+	//operator int() = delete;
+	__attribute__ ((error("Change me to a #define"))) operator int();
+private:
+	int pin;
+};
+
+extern PureAnalogPin  A8;
+extern PureAnalogPin  A9;
+extern PureAnalogPin  A10;
+extern PureAnalogPin  A11;
+
+/******************************************************************************
+ * FUNCTION DECLARATION
+ ******************************************************************************/
+
+void      PURE_ANALOG_AS_DIGITAL_ATTRIBUTE pinMode     (PureAnalogPin pin, PinMode mode);
+PinStatus PURE_ANALOG_AS_DIGITAL_ATTRIBUTE digitalRead (PureAnalogPin pin);
+void      PURE_ANALOG_AS_DIGITAL_ATTRIBUTE digitalWrite(PureAnalogPin pin, PinStatus value);
+int       analogRead  (PureAnalogPin pin);
+void      PURE_ANALOG_AS_DIGITAL_ATTRIBUTE analogWrite (PureAnalogPin pin, int value);
+
+#undef PURE_ANALOG_AS_DIGITAL_ATTRIBUTE
+
+#endif /* _PURE_ANALOG_PINS_ */