sm_lcd

This is the python library to control the Six-in-one LCD Adapter Kit Using 2004 or 1602 LCDs for Raspberry Pi.

Install

sudo pip install SMlcd

Usage

~$ python
Python 3.10.7 (main, Nov  7 2022, 22:59:03) [GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sm_lcd
>>> lcd = sm_lcd.SMlcd()
>>> lcd.bl_single(50)
>>> lcd.display_init()
>>> lcd.text_write_at(1, 1, 'Hello world')
>>>

More usage example in the examples folder

Functions prototypes

sm-lcd libray documentation

class sm_lcd.SMlcd(i2c = 1)

• Description
  • Init the SMlcd object and check the card presence
• Parameters
  • i2c : I2C port number, 1 - Raspberry default, 7 - rock pi 4, etc.
• Returns
  • card object

busy()

• Description
  • Get the LCD Display busy flag
• Parameters
  • none
• Returns
  • 1 if the LCD is busy; 0 otherwise

cmd(value)

• Description
  • Send a command to the LCD Display
• Parameters
  • value: command value, for example, Clear Display command value is 0x01
• Returns
  • none

display_init()

• Description
  • Default initialization for two or more lines display, not show cursor, no blinking cursor, no shifting. For custom initialization use cmd() function.
• Parameters
  • none
• Returns
  • none

data_write(value)

• Description
  • Write one byte of data to the display
• Parameters
  • value: The byte that will be sent to the LCD display
• Returns
  • none

data_read()

• Description
  • Read one byte of data from the display
• Parameters
  • none
• Returns
  • One byte of data

cursor_set(line, column)

• Description
  • Set cursor position, this function works for multiline display, with a maximum of 4 lines and 20 columns
• Parameters
  • line: line number [1..4]
  • column: column number [1..20]
• Returns
  • none

text_write(text)

• Description
  • Write a text at the cursor's current position. The function does not check the text length
• Parameters
  • text: the string to be displayed
• Returns
  • none

text_write_at(line, column, text):

• Description
  • Write a text at the specified position. The function does not check the text length
• Parameters
  • line display line number [1..4]
  • column display column number [1..20]
  • text the string to be displayed
• Returns
  • none

bl_single(val)

• Description
  • Set the single-color display backlight intensity
• Parameters
  • val: intensity in precentage [0..100]
• Returns
  • none

bl_rgb(red, green, blue)

• Description
  • Set the RGB display backlight intensity by color
• Parameters
  • red: red color intensity [0..100]
  • green: green color intensity [0..100]
  • blue: blue color intensity [0..100]
• Returns
  • none

get_button(button)

• Description
  • Get one pushbutton current state
• Parameters
  • button: button number [1..6]
• Returns
  • button state: 1 - button is pressed; 0 - otherwise

get_all_buttons()

• Description
  • Returns the state of all 6 buttons as a bitmap
• Parameters
  • none
• Returns
  • all buttons state [0x00..0x3f]

get_button_int(button)

• Description
  • Return 1 if a button has been pushed since the last call of this function. This function tells you if a button has generated an interrupt.
• Parameters
  • button: button number [1..6]
• Returns
  • 1 - the button has been pushed since last read; 0 - if not

get_all_buttons_int()

• Description
  • Returns the interrupt flag for all buttons and the rotary encoder as a bitmap, buttons bits 0..5, encoder change interrupt bot 7.
• Parameters
  • none
• Returns
  • Interrupt flags

get_encoder_int()

• Description
  • Get the encoder on change interrupt flag
• Parameters
  • none
• Returns
  • 1 - encoder value has been changed; 0 - if not

get_encoder_val()

• Description
  • Get the encoder accumulated value as a 16 bits signed integer
• Parameters
  • none
• Returns
  • encoder value (-32767..32767)

reset_encoder()

• Description
  • Reset the encoder value
• Parameters
  • none
• Returns
  • none