groveLCD.py

   1 import machine, time
   2
   3 i2c=machine.I2C(0)
   4
   5
   6 # this device has two I2C addresses
   7 DISPLAY_RGB_ADDR = 0x62
   8 DISPLAY_TEXT_ADDR = 0x3e
   9
  10 RGB_REG0=0x00
  11 RGB_REG1=0x01
  12 RGB_REG5=0x08
  13 RGB_REGR=0x04
  14 RGB_REGG=0x03
  15 RGB_REGB=0x02
  16
  17 i2c=machine.I2C(0)
  18
  19 def reg_write(i2c,addr,reg,data):
  20     msg=bytearray()
  21     msg.append(data)
  22     i2c.writeto_mem(addr,reg,msg)
  23
  24 # set backlight to (R,G,B) (values from 0..255 for each)
  25 def setRGB(r,g,b):
  26     reg_write(i2c,DISPLAY_RGB_ADDR,RGB_REG0,0)
  27     reg_write(i2c,DISPLAY_RGB_ADDR,RGB_REG1,0)
  28     reg_write(i2c,DISPLAY_RGB_ADDR,RGB_REG5,0xaa)
  29     reg_write(i2c,DISPLAY_RGB_ADDR,RGB_REGR,r)
  30     reg_write(i2c,DISPLAY_RGB_ADDR,RGB_REGG,g)
  31     reg_write(i2c,DISPLAY_RGB_ADDR,RGB_REGB,b)
  32
  33 def textCommand(cmd):
  34     reg_write(i2c,DISPLAY_TEXT_ADDR,0x80,cmd)
  35
  36 def setText(text):
  37     textCommand(0x01)
  38     time.sleep(.05)
  39     textCommand(0x08 | 0x04)
  40     textCommand(0x28)
  41     time.sleep(.05)
  42     count=0
  43     row=0
  44     for c in text:
  45         if c == '\n' or count == 16:
  46             count=0
  47             row+=1
  48             if row ==2:
  49                 break
  50             textCommand(0xc0)
  51             if c == '\n':
  52                 continue
  53         count +=1
  54         reg_write(i2c,DISPLAY_TEXT_ADDR,0x40,ord(c))
  55
  56 def setText_norefresh(text):
  57     textCommand(0x02) # return home
  58     time.sleep(.05)
  59     textCommand(0x08 | 0x04) # display on, no cursor
  60     textCommand(0x28) # 2 lines
  61     time.sleep(.05)
  62     count = 0
  63     row = 0
  64     while len(text) < 32: #clears the rest of the screen
  65         text += ' '
  66     for c in text:
  67         if c == '\n' or count == 16:
  68             count = 0
  69             row += 1
  70             if row == 2:
  71                 break
  72             textCommand(0xc0)
  73             if c == '\n':
  74                 continue
  75         count += 1
  76         reg_write(i2c,DISPLAY_TEXT_ADDR,0x40,ord(c))
  77
  78 def clearText():
  79     textCommand(0x01)