feat(swan_r5): user button tested

Author: m-mcgowan

ports/stm/boards/swan_r5/tests/button.py

@@ -0,0 +1,21 @@
+import board
+import digitalio
+import time
+
+def monitor_button(pin, callback):
+    with digitalio.DigitalInOut(pin) as button:
+        newstate = not button.value # state is inverted
+        state = not newstate    # ensure change reported to start with
+        while callback(newstate, newstate!=state):
+            state = newstate
+            newstate = button.value
+            time.sleep(0.01)
+
+def print_changes(state, changed):
+    if changed:
+        print(f"button pressed {state}")
+    return True
+
+monitor_button(board.BUTTON_USR, print_changes)
+
+

ports/stm/peripherals/stm32l4/stm32l4r5xx/gpio.c

@@ -38,7 +38,6 @@ void stm32_peripherals_gpio_init(void) {
     __HAL_RCC_GPIOG_CLK_ENABLE();
 
     // Never reset pins
-    never_reset_pin_number(2,13); // PC13 anti tamp
     never_reset_pin_number(2,14); // PC14 OSC32_IN
     never_reset_pin_number(2,15); // PC15 OSC32_OUT
     never_reset_pin_number(0,13); // PA13 SWDIO