Fixes and tweaks to demo's

examples/pyb_hello.py

 """
-ttgo_hello.py
+pyb_hello.py
 
     Writes "Hello!" in random colors at random locations on a
     on a ST7789 TFT display connected to a pyboard1.1.
 
-    video: https://youtu.be/OtcERmad5ps
-
+    https://youtu.be/OtcERmad5ps
 """
 import random, time
 from pyb import SPI, Pin

examples/pyb_scroll.py

+"""
+pyb_scroll.py
+
+    Smoothly scroll all characters of a font up the screen. Fonts heights
+    must be even multiples of the screen height (i.e. 8 or 16 pixels high).
+
+    https://youtu.be/ro13rvaLKAc
+"""
+
+import utime
+import random
+from pyb import SPI, Pin
+import st7789
+
+# choose a font
+# import vga1_8x8 as font
+# import vga2_8x8 as font
+# import vga1_8x16 as font
+# import vga2_8x16 as font
+# import vga1_16x16 as font
+# import vga1_bold_16x16 as font
+# import vga2_16x16 as font
+import vga2_bold_16x16 as font
+
+def cycle(p):
+    try:
+        len(p)
+    except TypeError:
+        cache = []
+        for i in p:
+            yield i
+            cache.append(i)
+        p = cache
+    while p:
+        yield from p
+
+def main():
+    tft = st7789.ST7789(
+        SPI(1, SPI.MASTER, baudrate=30000000, polarity=1, phase=0),
+        240,
+        320,
+        reset=Pin('X3', Pin.OUT),
+        cs=Pin('X5', Pin.OUT),
+        dc=Pin('X4', Pin.OUT),
+        backlight=Pin('X2', Pin.OUT),
+        rotation=0)
+
+    colors = cycle([0xe000, 0xece0, 0xe7e0, 0x5e0, 0x00d3, 0x7030])
+    foreground = next(colors)
+    background = st7789.BLACK
+
+    tft.init()
+    tft.fill(background)
+    utime.sleep(1)
+
+    height = tft.height()
+    width = tft.width()
+    last_line = height - font.HEIGHT
+
+    tfa = 0
+    tfb = 0
+    tft.vscrdef(tfa, height, tfb)
+
+    scroll = 0
+    character = 0
+
+    while True:
+        # clear top line before scrolling off display
+        tft.fill_rect(0, scroll, width, 1, background)
+
+        # Write new line when we have scrolled the height of a character
+        if scroll % font.HEIGHT == 0:
+            line = (scroll + last_line) % height
+
+            # write character hex value as a string
+            tft.text(
+                font,
+                'x{:02x}'.format(character),
+                0,
+                line,
+                foreground,
+                background)
+
+            # write character using a integer (could be > 0x7f)
+            tft.text(
+                font,
+                character,
+                64,
+                line,
+                foreground,
+                background)
+
+            # write character+128 hex value as a string
+            tft.text(
+                font,
+                'x{:02x}'.format(character+128),
+                120,
+                line,
+                foreground,
+                background)
+
+            # write character+128 using a integer (could be > 0x7f)
+            tft.text(
+                font,
+                character+128,
+                184,
+                line,
+                foreground,
+                background)
+
+            # change color for next line
+            foreground = next(colors)
+
+            # next character with rollover at 256
+            character += 1
+            character %= 128
+
+        tft.vscsad(scroll+tfa)
+        scroll +=1
+        scroll %= height
+
+        utime.sleep(0.01)
+
+main()

examples/time_trial.py

@@ -14,7 +14,7 @@ import st7789 as st7789
 import time
 import utime
 
-from fonts import vga2_8x16 as font
+import vga2_8x16 as font
 
 def main():
 

examples/ttgo_fonts.py

@@ -11,23 +11,10 @@ import random
 from machine import Pin, SPI
 import st7789
 
-# Choose fonts
-
 import vga1_8x8 as font1
-#import vga2_8x8 as font1
-
 import vga1_8x16 as font2
-#import vga2_8x16 as font2
-
-# import vga1_16x16 as font3
 import vga1_bold_16x16 as font3
-# import vga2_16x16 as font3
-#import vga2_bold_16x16 as font3
-
-# import vga1_16x32 as font4
 import vga1_bold_16x32 as font4
-# import vga2_16x32 as font4
-#import vga2_bold_16x32 as font4
 
 def main():
     tft = st7789.ST7789(

examples/ttgo_hello.py

@@ -4,7 +4,7 @@ ttgo_hello.py
     Writes "Hello!" in random colors at random locations on a
     LILYGO® TTGO T-Display.
 
-    https://www.youtube.com/watch?v=atBa0BYPAAc
+    https://youtu.be/z41Du4GDMSY
 
 """
 import random
@@ -13,21 +13,21 @@ import st7789
 
 # Choose a font
 
-# from fonts import vga1_8x8 as font
-# from fonts import vga2_8x8 as font
+# import vga1_8x8 as font
+# import vga2_8x8 as font
 
-# from fonts import vga1_8x16 as font
-# from fonts import vga2_8x16 as font
+# import vga1_8x16 as font
+# import vga2_8x16 as font
 
-# from fonts import vga1_16x16 as font
-# from fonts import vga1_bold_16x16 as font
-# from fonts import vga2_16x16 as font
-# from fonts import vga2_bold_16x16 as font
+# import vga1_16x16 as font
+# import vga1_bold_16x16 as font
+# import vga2_16x16 as font
+# import vga2_bold_16x16 as font
 
-# from fonts import vga1_16x32 as font
-# from fonts import vga1_bold_16x32 as font
-# from fonts import vga2_16x32 as font
-from fonts import vga2_bold_16x32 as font
+# import vga1_16x32 as font
+# import vga1_bold_16x32 as font
+# import vga2_16x32 as font
+import vga2_bold_16x32 as font
 
 def main():
     tft = st7789.ST7789(

examples/scroll_font.py → examples/ttgo_scroll.py

 """
-ttgo_fonts.py
+ttgo_scroll.py
 
-    Smoothly scrolls all font characters up the screen on the LILYGO® TTGO
-    T-Display. Only works with fonts with heights that are even multiples of
-    the screen height, (i.e. 8 or 16 pixels high)
+    Smoothly scroll all characters of a font up the LILYGO® TTGO T-Display
+    screen. Fonts heights must be even multiples of the screen height
+    (i.e. 8 or 16 pixels high).
 
+    https://youtu.be/GQa-RzHLBak
 """
 import utime
 import random
@@ -12,7 +13,6 @@ from machine import Pin, SPI
 import st7789
 
 # choose a font
-
 # import vga1_8x8 as font
 # import vga2_8x8 as font
 # import vga1_8x16 as font
@@ -20,10 +20,22 @@ import st7789
 # import vga1_16x16 as font
 # import vga1_bold_16x16 as font
 # import vga2_16x16 as font
+
 import vga2_bold_16x16 as font
 
-def main():
+def cycle(p):
+    try:
+        len(p)
+    except TypeError:
+        cache = []
+        for i in p:
+            yield i
+            cache.append(i)
+        p = cache
+    while p:
+        yield from p
 
+def main():
     tft = st7789.ST7789(
         SPI(2, baudrate=30000000, polarity=1, phase=1, sck=Pin(18), mosi=Pin(19)),
         135,
@@ -34,36 +46,62 @@ def main():
         backlight=Pin(4, Pin.OUT),
         rotation=0)
 
+    colors = cycle([0xe000, 0xece0, 0xe7e0, 0x5e0, 0x00d3, 0x7030])
+    foreground = next(colors)
+    background = st7789.BLACK
+
     tft.init()
+    tft.fill(background)
+    utime.sleep(1)
+
+    height = tft.height()
+    width = tft.width()
+    last_line = height - font.HEIGHT
 
-    print(tft.width(), tft.height())
-    last_line = tft.height() - font.HEIGHT
-    tfa = 40
-    tfb = 40
-    tft.vscrdef(tfa, 240, tfb)
+    tfa = 40        # top free area
+    tfb = 40        # bottom free area
+    tft.vscrdef(tfa, height, tfb)
 
-    tft.fill(st7789.BLUE)
     scroll = 0
     character = 0
+
     while True:
-        tft.fill_rect(0,scroll, tft.width(), 1, st7789.BLUE)
+        # clear top line before scrolling off display
+        tft.fill_rect(0, scroll, width, 1, background)
 
+        # Write new line when we have scrolled the height of a character
         if scroll % font.HEIGHT == 0:
+            line = (scroll + last_line) % height
+
+            # write character hex value as a string
+            tft.text(
+                font,
+                'x{:02x}'.format(character),
+                16,
+                line,
+                foreground,
+                background)
+
+            # write character using a integer (could be > 0x7f)
             tft.text(
                 font,
-                '\\x{:02x}= {:s} '.format(character, chr(character)),
-                0,
-                (scroll + last_line) % tft.height(),
-                st7789.WHITE,
-                st7789.BLUE)
+                character,
+                90,
+                line,
+                foreground,
+                background)
 
-            character = character +1 if character < 256 else 0
+            # change color for next line
+            foreground = next(colors)
 
-        tft.vscsad(scroll+tfa)
-        scroll +=1
+            # next character with rollover at 256
+            character += 1
+            character %= 256
 
-        if scroll == tft.height:
-            scroll = 0
+        # scroll the screen up 1 row
+        tft.vscsad(scroll+tfa)
+        scroll += 1
+        scroll %= height
 
         utime.sleep(0.01)