Fix NUCLEO_L452RE_P arduino pins (#335)

Author: Jamie Smith

hal/include/hal/i2c_api.h

@@ -338,7 +338,7 @@ int  i2c_slave_write(i2c_t *obj, const char *data, int length);
 /** Configure I2C address.
  *  @param obj     The I2C object
  *  @param idx     Currently not used
- *  @param address The address to be set
+ *  @param address The address to be set (8-bit, always a read address)
  *  @param mask    Currently not used
  */
 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask);

targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L452xE/TARGET_NUCLEO_L452RE_P/PinNames.h

@@ -120,9 +120,9 @@ typedef enum {
     ARDUINO_UNO_A4  = PC_1,
     ARDUINO_UNO_A5  = PC_0,
 
-    ARDUINO_UNO_D0  = PA_3,
-    ARDUINO_UNO_D1  = PA_2,
-    ARDUINO_UNO_D2  = PA_10,
+    ARDUINO_UNO_D0  = PA_10,
+    ARDUINO_UNO_D1  = PA_9,
+    ARDUINO_UNO_D2  = PA_12,
     ARDUINO_UNO_D3  = PB_3,
     ARDUINO_UNO_D4  = PB_5,
     ARDUINO_UNO_D5  = PA_15,

targets/targets.json5

@@ -4313,6 +4313,10 @@
         "detect_code": [
             "0829"
         ],
+        "overrides": {
+            // ADC vref on this board is connected to 3.3V VDD
+            "default-adc-vref": 3.3
+        },
         "device_name": "STM32L452RETx",
         "image_url": "https://mm.digikey.com/Volume0/opasdata/d220001/medias/images/2508/MFG_NUCLEO-L433RC-P.jpg"
     },