Merge pull request #569 from pimoroni/patch-inky-frame-buttons

MicroPython: Create inky_frame module for buttons.

micropython/modules_py/inky_frame.py

@@ -0,0 +1,49 @@
+from pimoroni import ShiftRegister
+from machine import Pin
+import time
+
+
+SR_CLOCK = 8
+SR_LATCH = 9
+SR_OUT = 10
+
+LED_A = 11
+LED_B = 12
+LED_C = 13
+LED_D = 14
+LED_E = 15
+
+
+class Button:
+    def __init__(self, sr, idx, led, debounce=50):
+        self.sr = sr
+        self.led = Pin(led, Pin.OUT)  # LEDs are just regular IOs
+        self.led.off()
+        self._idx = idx
+        self._debounce_time = debounce
+        self._changed = time.ticks_ms()
+        self._last_value = None
+
+    def read(self):
+        value = self.raw()
+        if value != self._last_value and time.ticks_ms() - self._changed > self._debounce_time:
+            self._last_value = value
+            self._changed = time.ticks_ms()
+            return value
+        return False
+
+    def raw(self):
+        return self.sr[self._idx] == 1
+
+    @property
+    def is_pressed(self):
+        return self.raw()
+
+
+sr = ShiftRegister(SR_CLOCK, SR_LATCH, SR_OUT)
+
+button_a = Button(sr, 7, LED_A)
+button_b = Button(sr, 6, LED_B)
+button_c = Button(sr, 5, LED_C)
+button_d = Button(sr, 4, LED_D)
+button_e = Button(sr, 3, LED_E)

micropython/modules_py/modules_py.cmake

@@ -23,4 +23,5 @@ copy_module(usermod_modules_py ${CMAKE_CURRENT_LIST_DIR}/interstate75.py interst
 if(PICO_BOARD STREQUAL "pico_w")
     copy_module(usermod_modules_py ${CMAKE_CURRENT_LIST_DIR}/automation.py automation)
     copy_module(usermod_modules_py ${CMAKE_CURRENT_LIST_DIR}/inventor.py inventor)
+    copy_module(usermod_modules_py ${CMAKE_CURRENT_LIST_DIR}/inky_frame.py inky_frame)
 endif()