Changing micro:bit display representation to bytearray, converting range from 0..255 to 0..9

Author: Kevin J Walters

zhhclock/zc_bg_brightnesstest.py

@@ -11,7 +11,7 @@ def render(self, local_time, milliseconds, ticks_ms):
         for idx in range(min(len(self._zip), 255)):
             self._zip[idx] = (idx, 0, 0)
 
-        for idx in range(10):
-            self._mdisplaylist[idx] = round(idx * 255 / 9.0)
+        for idx in range(9 + 1):
+            self._mdisplaylist[idx] = idx
 
         return self.MICROBIT_CHANGED | self.HALO_CHANGED

zhhclock/zc_bg_digitalrain.py

@@ -99,7 +99,7 @@ def render(self, local_time, milliseconds, ticks_ms):
                     brightness = (trail_bri * head_bri
                                   * max(0, (il_radius - distances[0])) / il_radius)
                     if brightness > 0.0:
-                        self._mdisplaylist[m_idx] = max(round(brightness), self._mdisplaylist[m_idx])
+                        self._mdisplaylist[m_idx] = max(round(brightness / 255.0 * 9), self._mdisplaylist[m_idx])
 
         self._last_run_tms = ticks_ms
         ### TODO could count the changes

zhhclock/zc_bg_flag.py

@@ -58,7 +58,7 @@ def flag_wales(self):
                                                                      // len(self._zip)]]
         ### Off substitues for white on top left
         for idx in range(len(self._mdisplaylist)):
-            self._mdisplaylist[idx] = 0 if idx in (0, 5) else 128
+            self._mdisplaylist[idx] = 0 if idx in (0, 5) else 7  ### 7 out of 9
 
         return self.HALO_CHANGED | self.MICROBIT_CHANGED
 
@@ -93,8 +93,8 @@ def _wind_ripple(self, ripple_time, total, changes_):
                 if idx != tophalf_idx:
                     r, g, b = self._zip[tophalf_idx]
                     self._zip[tophalf_idx] = (min(255, max(0, round(r * col_p1))),
-                                      min(255, max(0, round(g * col_p1))),
-                                      min(255, max(0, round(b * col_p1))))
+                                              min(255, max(0, round(g * col_p1))),
+                                              min(255, max(0, round(b * col_p1))))
 
         if changes_ & self.MICROBIT_CHANGED:
             ### Modulate micro:bit display using values calculated per column
@@ -103,7 +103,7 @@ def _wind_ripple(self, ripple_time, total, changes_):
                 moving_x = 0 - led_x + shift_x
                 col_p1 = self._wind_ripple_mod(moving_x) / 1.9 + 1.0
                 for y_off in range(0, 25, 5):
-                    self._mdisplaylist[m_idx + y_off] = min(255,
+                    self._mdisplaylist[m_idx + y_off] = min(9,
                                                             max(0,
                                                             round(self._mdisplaylist[m_idx + y_off]
                                                                   * col_p1)))

zhhclock/zc_bg_larsonscanner.py

@@ -23,7 +23,7 @@ def render(self, local_time, milliseconds, ticks_ms):
         x3 = x1 - 0.150 * dir
 
         z_bri = 30
-        m_bri = 255
+        m_bri = 9
         il_radius = 0.08
         for x in (x1, x2, x3):
             for p_idx in get_z_pixels_through_x(x):
@@ -37,8 +37,8 @@ def render(self, local_time, milliseconds, ticks_ms):
                 distance = abs(M_LED_POS[m_idx][0] - x)
                 brightness = (max(0, (il_radius - distance)) / il_radius)
                 if brightness > 0.0:
-                    self._mdisplaylist[m_idx] = max(round(brightness * m_bri), self._mdisplaylist[m_idx])
-
+                    self._mdisplaylist[m_idx] = max(round(brightness * m_bri),
+                                                    self._mdisplaylist[m_idx])
             z_bri /= 2
             m_bri /= 2
 

zhhclock/zhhclock.py

@@ -118,17 +118,9 @@ def writeto_mem(self, addr, memaddr, buf, *, addrsize=8):
 zip_px.fill(BLACK)
 zip_px.show()
 
-display_image = [0] * (5 * 5)
-
-microbit_bri_conv = 9.0 / 255.0
-ORD_ZERO = ord("0")
+display_image = bytearray(25)   ### values are 0..9
 def show_display_image():
-    ### This converts integer (0..255) array into the MicroPython
-    ### text representation of an image
-    img = ":".join(["".join([chr(ORD_ZERO
-                                 + round(x * microbit_bri_conv))
-                             for x in display_image[0+offset:5+offset]]) for offset in range(0, 25, 5)])
-    display.show(Image(img))
+    display.show(Image(5, 5, display_image))
 
 show_display_image()
 gc.collect()