bucknalla / micropython-i2c-lcd

🖥 MicroPython Driver for I2C 2x16 LCD Screens

MicroPython I2C 16x2 LCD Screen

This library is designed to support a MicroPython interface for i2c LCD character screens. It's designed around the Pycom implementation of MicroPython so will need to be tweaked to work for CircuitPython.

Compatible LCDs

• Grove LCD RGB Backlight

Tested Dev Kits

• LoPy
• WiPy
• SiPy

Module

This module supports writing to, clearing and refreshing the LCD screen, among other functions.

write(text)

Prints text to LCD screen at the location of the cursor.

autoscroll(bool)

Enables lcd to scroll text as typed.

cursor(bool)

Sets cursor visibility.

blink(bool)

Sets blink visibility.

display(bool)

Sets display state (on/off).

home()

Returns the cursor to the (0,0) location on screen

move(col, row)

Moves the cursor to (col,row)

color(r, g, b)

Changes the color of the LCD Backlight to (r,g,b)

micropython-i2c-lcd's Issues

I2C.MASTER doesn't exist anymore

When importing this library I keep running into the following error:

>>> import i2c_lcd 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "i2c_lcd.py", line 10, in <module>
  File "i2c_lcd.py", line 14, in Display
AttributeError: type object 'I2C' has no attribute 'MASTER'

From what I understand from https://forum.micropython.org/viewtopic.php?t=2710 it's been deprecated, but I must admit that this lowlevel stuff isn't really something I'm used to. Does any of this make sense and would there be an easy way for me to patch this. Your library sounds exactly like what I need, since I want to control a Grove 16x2 display using an rpi pico.

mem_write bug on i2c bus

LCD Screen Freezes after a number of writes to memory. Likely to do with the i2c buffer.

autoscroll() bug

I tried Screen.autoscroll() with MicroPython 1.17 on NUCLEO-L476RG board,
and Grove 16x2 LCD RGB backlight v4.0
It does not work.

Here is my fix :

def autoscroll(self, state):
        if state:
            # self.disp_ctrl |= self.LCD_ENTRYSHIFTINCREMENT
            # self.cmd(self.LCD_DISPLAYCONTROL  | self.disp_ctrl)
            self.disp_mode |= self.LCD_ENTRYSHIFTINCREMENT  
            self.cmd(self.LCD_ENTRYMODESET  | self.disp_mode) 

        else:
            # self.disp_ctrl &= ~self.LCD_ENTRYSHIFTINCREMENT
            # self.cmd(self.LCD_DISPLAYCONTROL  | self.disp_ctrl)
            self.disp_mode &= ~self.LCD_ENTRYSHIFTINCREMENT  
            self.cmd(self.LCD_ENTRYMODESET  | self.disp_mode) 

OSError: I2C bus error

I tried to connect the RGB Backlight using your lib but I get an OSError.

I plugged it on VIN GND P21 and P22