add support for A6 (D8) and A7 (D9)

Author: ladyada

cores/arduino/wiring_analog.c

@@ -140,10 +140,12 @@ uint32_t analogRead( uint32_t ulPin )
 {
   uint32_t valueRead = 0;
 
-  if ( ulPin < A0 )
+  if ( ulPin <= 5 ) // turn '0' -> 'A0'
   {
     ulPin += A0 ;
   }
+  if (ulPin == 6) ulPin = PIN_A6;
+  if (ulPin == 7) ulPin = PIN_A7;
 
   pinPeripheral(ulPin, g_APinDescription[ulPin].ulPinType);
 

variants/arduino_zero/variant.cpp

@@ -127,8 +127,8 @@ const PinDescription g_APinDescription[]=
   { PORTA, 21, PIO_DIGITAL, (PIN_ATTR_DIGITAL), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_5 },
 
   // Digital High
-  { PORTA,  6, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM1_CH0, TCC1_CH0, EXTERNAL_INT_6 }, // TCC1/WO[0]
-  { PORTA,  7, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM1_CH1, TCC1_CH1, EXTERNAL_INT_7 }, // TCC1/WO[1]
+  { PORTA,  6, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER|PIN_ATTR_ANALOG), ADC_Channel6, PWM1_CH0, TCC1_CH0, EXTERNAL_INT_6 }, // TCC1/WO[0]
+  { PORTA,  7, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER|PIN_ATTR_ANALOG), ADC_Channel7, PWM1_CH1, TCC1_CH1, EXTERNAL_INT_7 }, // TCC1/WO[1]
   { PORTA, 18, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM3_CH0, TC3_CH0, EXTERNAL_INT_2 }, // TC3/WO[0]
   { PORTA, 16, PIO_TIMER, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM2_CH0, TCC2_CH0, EXTERNAL_INT_0 }, // TCC2/WO[0]
   { PORTA, 19, PIO_TIMER_ALT, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, PWM0_CH3, TCC0_CH3, EXTERNAL_INT_3 }, // TCC0/WO[3]

variants/arduino_zero/variant.h

@@ -52,7 +52,7 @@ extern "C"
 // Number of pins defined in PinDescription array
 #define PINS_COUNT           (26u)
 #define NUM_DIGITAL_PINS     (14u)
-#define NUM_ANALOG_INPUTS    (6u)
+#define NUM_ANALOG_INPUTS    (8u)
 #define NUM_ANALOG_OUTPUTS   (1u)
 
 #define digitalPinToPort(P)        ( &(PORT->Group[g_APinDescription[P].ulPort]) )
@@ -93,13 +93,17 @@ extern "C"
 #define PIN_A3               (17ul)
 #define PIN_A4               (18ul)
 #define PIN_A5               (19ul)
+#define PIN_A6               (8ul)
+#define PIN_A7               (9ul)
 
 static const uint8_t A0  = PIN_A0 ;
 static const uint8_t A1  = PIN_A1 ;
 static const uint8_t A2  = PIN_A2 ;
 static const uint8_t A3  = PIN_A3 ;
 static const uint8_t A4  = PIN_A4 ;
 static const uint8_t A5  = PIN_A5 ;
+static const uint8_t A6  = PIN_A6 ;
+static const uint8_t A7  = PIN_A7 ;
 #define ADC_RESOLUTION		12
 
 // Other pins