Adding abstraction for Arduino pin modes to maintain compatibility with 3rd party libraries

Author: frinkahedron

cores/arduino/ard_sup/analog/ap3_analog.cpp

@@ -313,7 +313,7 @@ ap3_err_t ap3_set_pin_to_analog(uint8_t pinNumber)
     ap3_err_t retval = AP3_ERR;
 
     uint8_t funcsel = 0;
-    am_hal_gpio_pincfg_t pincfg = INPUT;
+    am_hal_gpio_pincfg_t pincfg = AP3_PINCFG_INPUT;
     retval = ap3_analog_pad_funcsel(ap3_gpio_pin2pad(pinNumber), &funcsel);
 
     if (retval != AP3_OK)

cores/arduino/ard_sup/ap3_gpio.h

@@ -34,12 +34,21 @@ extern const am_hal_gpio_pincfg_t g_AM_HAL_GPIO_OUTPUT_WITH_READ_12;
 extern const am_hal_gpio_pincfg_t g_AM_HAL_GPIO_OPEN_DRAIN_WITH_READ_12;
 extern const am_hal_gpio_pincfg_t g_AM_HAL_GPIO_INPUT_PULLDOWN;
 
-#define INPUT (g_AM_HAL_GPIO_INPUT)
-#define OUTPUT (g_AM_HAL_GPIO_OUTPUT_WITH_READ_12)
-#define OPEN_DRAIN (g_AM_HAL_GPIO_OPEN_DRAIN_WITH_READ_12)
-#define TRISTATE (g_AM_HAL_GPIO_TRISTATE)
-#define INPUT_PULLUP (g_AM_HAL_GPIO_INPUT_PULLUP)
-#define INPUT_PULLDOWN (g_AM_HAL_GPIO_INPUT_PULLDOWN)
+// macros pointing to internal apollo3 GPIO pincfg structures
+#define AP3_PINCFG_INPUT            (g_AM_HAL_GPIO_INPUT)
+#define AP3_PINCFG_OUTPUT           (g_AM_HAL_GPIO_OUTPUT_WITH_READ_12)
+#define AP3_PINCFG_INPUT_PULLUP     (g_AM_HAL_GPIO_INPUT_PULLUP)
+#define AP3_PINCFG_INPUT_PULLDOWN   (g_AM_HAL_GPIO_INPUT_PULLDOWN)
+#define AP3_PINCFG_OPEN_DRAIN       (g_AM_HAL_GPIO_OPEN_DRAIN_WITH_READ_12)
+#define AP3_PINCFG_TRISTATE         (g_AM_HAL_GPIO_TRISTATE)
+
+// constants for Arduino pin modes
+#define INPUT           (0x00)
+#define OUTPUT          (0x01)
+#define INPUT_PULLUP    (0x02)
+#define INPUT_PULLDOWN  (0x03)
+#define OPEN_DRAIN      (0x04)
+#define TRISTATE        (0x05)
 
 #define AP3_GPIO_MAX_PADS (50)
 #define AP3_GPIO_IS_VALID(pad) ((pad >= 0) && (pad < AP3_GPIO_MAX_PADS))
@@ -59,6 +68,7 @@ uint32_t ap3_gpio_enable_interrupts(uint32_t ui32Pin, uint32_t eIntDir);
 void padMode(uint8_t pad, am_hal_gpio_pincfg_t mode);
 void padMode(uint8_t pad, am_hal_gpio_pincfg_t mode, ap3_err_t *retval);
 
+void pinMode(uint8_t pin, uint8_t mode);
 void pinMode(uint8_t pin, am_hal_gpio_pincfg_t mode);
 void pinMode(uint8_t pin, am_hal_gpio_pincfg_t mode, ap3_err_t *retval);
 void digitalWrite(uint8_t pin, uint8_t val);

cores/arduino/ard_sup/gpio/ap3_gpio.cpp

@@ -75,6 +75,38 @@ void padMode(uint8_t pad, am_hal_gpio_pincfg_t mode)
     padMode(pad, mode, NULL);
 }
 
+// translate Arduino style pin mode function to apollo3 implementation
+void pinMode(uint8_t pin, uint8_t mode) {
+
+    am_hal_gpio_pincfg_t pinmode = AP3_GPIO_PINCFG_NULL;
+
+    switch (mode) {
+        case INPUT:
+            pinmode = AP3_PINCFG_INPUT;
+            break;
+        case OUTPUT:
+            pinmode = AP3_PINCFG_OUTPUT;
+            break;
+        case INPUT_PULLUP:
+            pinmode = AP3_PINCFG_INPUT_PULLUP;
+            break;
+        case INPUT_PULLDOWN:
+            pinmode = AP3_PINCFG_INPUT_PULLDOWN;
+            break;
+        case OPEN_DRAIN:
+            pinmode = AP3_PINCFG_OPEN_DRAIN;
+            break;
+        case TRISTATE:
+            pinmode = AP3_PINCFG_TRISTATE;
+            break;
+        default:
+            //no match, just do nothing
+            return;
+    }
+
+    pinMode(pin, pinmode);
+}
+
 void pinMode(uint8_t pin, am_hal_gpio_pincfg_t mode, ap3_err_t *retval)
 {
     ap3_gpio_pad_t pad = ap3_gpio_pin2pad(pin);