Fixed issue with clear of picoscroll not working under mpy, and added demo

libraries/pico_scroll/pico_scroll.cpp

@@ -55,6 +55,10 @@ namespace pimoroni {
     gpio_set_function(pin::B, GPIO_FUNC_SIO); gpio_set_dir(pin::B, GPIO_IN); gpio_pull_up(pin::B);
     gpio_set_function(pin::X, GPIO_FUNC_SIO); gpio_set_dir(pin::X, GPIO_IN); gpio_pull_up(pin::X);
     gpio_set_function(pin::Y, GPIO_FUNC_SIO); gpio_set_dir(pin::Y, GPIO_IN); gpio_pull_up(pin::Y);
+
+    // reset the screen
+    clear();
+    update();
   }
 
   void PicoScroll::set_pixel(uint8_t x, uint8_t y, uint8_t v) {

micropython/examples/pico_scroll/demo.py

@@ -0,0 +1,36 @@
+import time
+import picoscroll as scroll
+
+scroll.init()
+i = 0
+loop = 18
+br_mult = 1
+br_pressed = 32
+tail = 12
+
+width = scroll.get_width()
+height = scroll.get_height()
+while True:
+    scroll.clear();
+    for y in range(0, height):
+        for x in range(0, width):
+            if x < 3 and y < 3 and scroll.is_pressed(scroll.BUTTON_A):
+                scroll.set_pixel(x, y, br_pressed)
+            elif x < 3 and y > 3 and scroll.is_pressed(scroll.BUTTON_B):
+                scroll.set_pixel(x, y, br_pressed)
+            elif x > width - 4 and y < 3 and scroll.is_pressed(scroll.BUTTON_X):
+                scroll.set_pixel(x, y, br_pressed)
+            elif x > width - 4 and y > 3 and scroll.is_pressed(scroll.BUTTON_Y):
+                scroll.set_pixel(x, y, br_pressed)
+            else:
+                m = (x + (y * width)) % loop
+                for b in range(0, loop):
+                    if m == (i + (loop - b)) % loop and b < tail:
+                        scroll.set_pixel(x, y, br_mult * (tail - b))
+                        
+
+    scroll.update()
+    i += 1
+    if i >= loop:
+        i = 0
+    time.sleep(0.02)

micropython/modules/pico_scroll/pico_scroll.c

@@ -20,7 +20,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_0(picoscroll_get_width_obj, picoscroll_get_width)
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(picoscroll_get_height_obj, picoscroll_get_height);
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(picoscroll_update_obj, picoscroll_update);
 STATIC MP_DEFINE_CONST_FUN_OBJ_3(picoscroll_set_pixel_obj, picoscroll_set_pixel);
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(picoscroll_clear_obj, picoscroll_init);
+STATIC MP_DEFINE_CONST_FUN_OBJ_0(picoscroll_clear_obj, picoscroll_clear);
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(picoscroll_is_pressed_obj, picoscroll_is_pressed);
 
 /***** Globals Table *****/