Add simple button handler

Long press brings it into bootloader mode.

install.sh

@@ -4,8 +4,11 @@ pushd internal_filesystem/
 
 ~/sources/lvgl_micropython/lib/micropython/tools/mpremote/mpremote.py fs cp boot.py :/boot.py
 ~/sources/lvgl_micropython/lib/micropython/tools/mpremote/mpremote.py fs cp main.py :/main.py
+
+#~/sources/lvgl_micropython/lib/micropython/tools/mpremote/mpremote.py fs cp main.py :/system/button.py
 #~/sources/lvgl_micropython/lib/micropython/tools/mpremote/mpremote.py fs cp autorun.py :/autorun.py
 
+~/sources/lvgl_micropython/lib/micropython/tools/mpremote/mpremote.py fs cp -r system :/
 ~/sources/lvgl_micropython/lib/micropython/tools/mpremote/mpremote.py fs cp -r apps :/
 ~/sources/lvgl_micropython/lib/micropython/tools/mpremote/mpremote.py fs cp -r builtin :/
 ~/sources/lvgl_micropython/lib/micropython/tools/mpremote/mpremote.py fs cp -r lib :/

internal_filesystem/main.py

@@ -395,8 +395,9 @@ def restart_launcher():
     # No need to stop the other launcher first, because it exits after building the screen
     start_app_by_name("com.example.launcher", True)
 
-# Execute this if it exists
-execute_script_new_thread("/autorun.py", True, False, False)
+# Execute these if they exist:
+execute_script_new_thread("/autorun.py", True, False, False) # Generic run-at-boot script, for development
+execute_script_new_thread("/system/button.py", True, False, False) # Button handling through IRQ
 
 try:
     import freezefs_mount_builtin

internal_filesystem/system/button.py

@@ -0,0 +1,50 @@
+print("button.py running")
+
+from machine import Pin, Timer
+import time
+
+# Configure IO0 as input with pull-up resistor
+button = Pin(0, Pin.IN, Pin.PULL_UP)
+
+# Variables for long press detection
+long_press_duration = 4000
+press_start_time = 0
+is_pressed = False
+
+# Timer for checking long press
+timer = Timer(-1)
+
+
+def on_long_press(t): # Callback for when long press duration is reached.
+    timer.deinit()  # Stop the timer
+    global is_pressed
+    if is_pressed and button.value() == 0:  # Ensure button is still pressed
+        print("Button IO0 long pressed, going into bootloader mode...")
+        import machine
+        machine.bootloader()
+    else:
+        is_pressed = False
+
+
+def button_handler(pin):
+    """Interrupt handler for button press and release."""
+    global press_start_time, is_pressed
+    # Debounce: Ignore interrupts within 50ms of the last event
+    if time.ticks_diff(time.ticks_ms(), press_start_time) < 50:
+        return
+    if button.value() == 0:  # Button pressed (LOW due to pull-up)
+        print("Button IO0 pressed.")
+        press_start_time = time.ticks_ms()
+        is_pressed = True
+        # Start timer to check for long press after long_press_duration
+        timer.init(mode=Timer.ONE_SHOT, period=long_press_duration, callback=on_long_press)
+    else:  # Button released (HIGH)
+        print("Button IO0 released.")
+        timer.deinit()  # Cancel timer if button is released early
+        is_pressed = False
+
+
+# Set up interrupt for both falling (press) and rising (release) edges
+button.irq(trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING, handler=button_handler)
+
+print("button.py finished")

manifest.py

@@ -1,4 +1,5 @@
 freeze('internal_filesystem/', 'boot.py') # Hardware initialization
 freeze('internal_filesystem/', 'main.py') # User Interface initialization
 freeze('internal_filesystem/lib', '') # Additional libraries
+freeze('internal_filesystem/system', '') # Additional libraries
 freeze('/home/user/sources/freezeFS/', 'freezefs_mount_builtin.py') # Built-in apps

patches/lv_conf.h

@@ -755,15 +755,15 @@ extern void *mp_lv_roots;
 #endif
 
 /*API for memory-mapped file access. */
-#define LV_USE_FS_MEMFS 1
+#define LV_USE_FS_MEMFS 0
 #if LV_USE_FS_MEMFS
     #define LV_FS_MEMFS_LETTER '\0'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
 #endif
 
 /*API for LittleFs. */
-#define LV_USE_FS_LITTLEFS 1
+#define LV_USE_FS_LITTLEFS 0
 #if LV_USE_FS_LITTLEFS
-    #define LV_FS_LITTLEFS_LETTER 'L'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
+    #define LV_FS_LITTLEFS_LETTER '\0'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
 #endif
 
 /*API for Arduino LittleFs. */