cores: arduino: digitalPins: take into account boards without gpios

Added a condition that the length of digital_pin_gpios is 0 or more.

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Pick: arduino@d20ef628

Co-Authored-by:    Martino Facchin <m.facchin@arduino.cc>
Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Author: facchinm

cores/arduino/Arduino.h

@@ -14,6 +14,7 @@
 #include <zephyr/drivers/adc.h>
 #include <zephyr/drivers/i2c.h>
 
+#if DT_PROP_LEN(DT_PATH(zephyr_user), digital_pin_gpios) > 0
 #define DIGITAL_PIN_EXISTS(n, p, i, dev, num)                                                      \
 	(((dev == DT_REG_ADDR(DT_PHANDLE_BY_IDX(n, p, i))) && (num == DT_PHA_BY_IDX(n, p, i, pin))) ?  \
 		 1 :                                                                                       \
@@ -31,6 +32,7 @@
 #endif
 
 #undef DIGITAL_PIN_CHECK_UNIQUE
+#endif
 
 /* Return the index of it if matched, oterwise return 0 */
 #define LED_BUILTIN_INDEX_BY_REG_AND_PINNUM(n, p, i, dev, num)                                     \
@@ -79,7 +81,9 @@
  * enum digitalPins { D0, D1, ... LED... NUM_OF_DIGITAL_PINS };
  */
 enum digitalPins {
+#if DT_PROP_LEN(DT_PATH(zephyr_user), digital_pin_gpios) > 0
 	DT_FOREACH_PROP_ELEM_SEP(DT_PATH(zephyr_user), digital_pin_gpios, DN_ENUMS, (, )),
+#endif
 	NUM_OF_DIGITAL_PINS
 };
 

cores/arduino/zephyrCommon.cpp

@@ -15,6 +15,8 @@ static const struct gpio_dt_spec arduino_pins[] = {
 
 namespace {
 
+#if DT_PROP_LEN(DT_PATH(zephyr_user), digital_pin_gpios) > 0
+
 /*
  * Calculate GPIO ports/pins number statically from devicetree configuration
  */
@@ -64,6 +66,13 @@ const int port_num = sum_of_list(
 const int max_ngpios = max_in_list(
 	0, DT_FOREACH_PROP_ELEM_SEP(DT_PATH(zephyr_user), digital_pin_gpios, GPIO_NGPIOS, (, )));
 
+#else
+
+const int port_num = 1;
+const int max_ngpios = 0;
+
+#endif
+
 /*
  * GPIO callback implementation
  */