LPC55S69: Add restricted GPIO pins for FPGA testing

Author: mprse

targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_LPCXpresso/PeripheralPins.c

@@ -16,3 +16,24 @@
 
 #include "PeripheralPins.h"
 #include "PeripheralPinMaps.h"
+
+// List of GPIOs with limited functionality
+const PinList *pinmap_gpio_restricted_pins()
+{
+    static const PinName pins[] = {
+        A4,   // fixed pull-up (for I2C)
+        A5,   // fixed pull-up (for I2C)
+        D5,   // fixed pull-up (for LED)
+        D3,   // fixed pull-up (for LED)
+        D4,   // fixed pull-up (for LED)
+        D7,   // fixed pull-up
+        D15,  // fixed pull-up (for I2C)
+        D14   // fixed pull-up (for I2C)
+    };
+
+    static const PinList pin_list = {
+        sizeof(pins) / sizeof(pins[0]),
+        pins
+    };
+    return &pin_list;
+}