Fix lib

rpi/lcd-screen/grove_rgb_lcd.py

@@ -1,6 +1,26 @@
-import time,sys
+#!/usr/bin/env python
-from grove_rgb_lcd import lcd
+#
+# GrovePi Example for using the Grove - LCD RGB Backlight (http://www.seeedstudio.com/wiki/Grove_-_LCD_RGB_Backlight)
+#
+# The GrovePi connects the Raspberry Pi and Grove sensors.  You can learn more about GrovePi here:  http://www.dexterindustries.com/GrovePi
+#
+# Have a question about this example?  Ask on the forums here:  http://forum.dexterindustries.com/c/grovepi
+#
+# History
+# ------------------------------------------------
+# Author        Date                    Comments
+#                                                       Initial Authoring
+# Karan         7 Jan 16                Library updated to add a function to update the text without erasing the screen
+# Released under the MIT license (http://choosealicense.com/licenses/mit/).
+# For more information see https://github.com/DexterInd/GrovePi/blob/master/LICENSE
 
+#
+# NOTE:
+#       Just supports setting the backlight colour, and
+#       putting a single string of text onto the display
+#       Doesn't support anything clever, cursors or anything
+
+import time,sys
 
 if sys.platform == 'uwp':
     import winrt_smbus as smbus
@@ -75,15 +95,28 @@ def setText_norefresh(text):
         count += 1
         bus.write_byte_data(DISPLAY_TEXT_ADDR,0x40,ord(c))
 
+# Create a custom character (from array of row patterns)
+def create_char(location, pattern):
+    """
+    Writes a bit pattern to LCD CGRAM
+
+    Arguments:
+    location -- integer, one of 8 slots (0-7)
+    pattern -- byte array containing the bit pattern, like as found at
+               https://omerk.github.io/lcdchargen/
+    """
+    location &= 0x07 # Make sure location is 0-7
+    textCommand(0x40 | (location << 3))
+    bus.write_i2c_block_data(DISPLAY_TEXT_ADDR, 0x40, pattern)
+
 # example code
 if __name__=="__main__":
-    setRGB(255, 255, 255)
+    setText("Hello world\nThis is an LCD test")
-    # Total time in seconds
+    setRGB(0,128,64)
-    total_seconds = 5 * 60
+    time.sleep(2)
-
+    for c in range(0,255):
-    while total_seconds >= 0:
+        setText_norefresh("Going to sleep in {}...".format(str(c)))
-        minutes = total_seconds // 60
+        setRGB(c,255-c,0)
-        seconds = total_seconds % 60
+        time.sleep(0.1)
-        setText(f"{minutes:02d}:{seconds:02d}")
+    setRGB(0,255,0)
-        time.sleep(1)
+    setText("Bye bye, this should wrap onto next line")
-        total_seconds -= 1