Introduce all alternative pins per peripheral

- Alternate pins (PY_n_ALTx)
- Dual pad pins (PY_n_C)
- Remap pins (PY_n_ALTR)

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

Author: fpistm

cores/arduino/stm32/PinNames.h

@@ -8,6 +8,23 @@
 extern "C" {
 #endif
 
+// Alternative possibilities which use other HW peripheral instances
+#define ALT0 0x100
+#define ALT1 0x200
+#define ALT2 0x300
+#define ALT3 0x400
+#define ALT4 0x500
+#define ALT5 0x600
+#define ALT6 0x700
+// Analog internal
+#define ALTA 0x1000
+// Dual pad pin
+#define ALTC 0x2000
+// Remap pin
+#define ALTR 0x3000
+// PinName mask
+#define PN_MASK 0xFF
+
 typedef enum {
   // Not connected
   NC = (int)0xFFFFFFFF,
@@ -227,7 +244,7 @@ typedef enum {
   PZ_15 = (PortZ << 4) + 0x0F,
 #endif
   // Specific pin name
-  PADC_BASE = 0x100,
+  PADC_BASE = ALTA,
 #if defined(ADC_CHANNEL_TEMPSENSOR) || defined(ADC_CHANNEL_TEMPSENSOR_ADC1)
   PADC_TEMP,
 #endif

keywords.txt

@@ -726,6 +726,17 @@ PADC_TEMP	LITERAL1
 PADC_VREF	LITERAL1
 PADC_VBAT	LITERAL1
 
+ALT0  LITERAL1
+ALT1  LITERAL1
+ALT2  LITERAL1
+ALT3  LITERAL1
+ALT4  LITERAL1
+ALT5  LITERAL1
+ALT6  LITERAL1
+ALTA  LITERAL1
+ALTC  LITERAL1
+ALTR  LITERAL1
+
 # Port Name
 PortName	KEYWORD3
 FirstPort