Fix A0-A3 pin definitions for Adafruit QT Py RP2040 (#397)

Author: Kealper

variants/adafruit_qtpy/pins_arduino.h

@@ -38,4 +38,10 @@
 #define SPI_HOWMANY    (1u)
 #define WIRE_HOWMANY   (2u)
 
+// Pin overrides specific to the QT Py RP2040
+#define __PIN_A0 (29u)
+#define __PIN_A1 (28u)
+#define __PIN_A2 (27u)
+#define __PIN_A3 (26u)
+
 #include "../generic/common.h"

variants/generic/common.h

@@ -39,10 +39,29 @@ static const uint8_t D27 = (27u);
 static const uint8_t D28 = (28u);
 static const uint8_t D29 = (29u);
 
-static const uint8_t A0 = (26u);
-static const uint8_t A1 = (27u);
-static const uint8_t A2 = (28u);
-static const uint8_t A3 = (29u);
+#ifdef __PIN_A0
+	static const uint8_t A0 = __PIN_A0;
+#else
+	static const uint8_t A0 = (26u);
+#endif
+
+#ifdef __PIN_A1
+	static const uint8_t A1 = __PIN_A1;
+#else
+	static const uint8_t A1 = (27u);
+#endif
+
+#ifdef __PIN_A2
+	static const uint8_t A2 = __PIN_A2;
+#else
+	static const uint8_t A2 = (28u);
+#endif
+
+#ifdef __PIN_A3
+	static const uint8_t A3 = __PIN_A3;
+#else
+	static const uint8_t A3 = (29u);
+#endif
 
 static const uint8_t SS = PIN_SPI0_SS;
 static const uint8_t MOSI = PIN_SPI0_MOSI;