What it is

Library for graphical LCDs for Python on Raspberry Pi. Creates a united interface for supported devices

Supported:

• ili9486 via SPI
• ili9325 via GPIO
• ssd1306 via SPI
• nju6450 via GPIO
• sh1106 via SPI

And for touch panels:

• ad7843 via SPI, uses irq or not
• ad7846/xpt2046

Bonus

• HD44780 emulation (works with CharLCD)

On NJU and SSD uses buffer to keep current content as help for page operations.

Wiring is below

Demos are in demos directory

LCD initialization

SSD1306

SPI

from driver.ssd1306.spi import SPI
from driver.ssd1306.ssd1306 import SSD1306
drv = SPI()
o = SSD1306(128, 64, drv)
o.init()

If you want to set your own pins:

drv = SPI()
drv.pins = {
    'RST': 13,
    'DC': 6,
    'CS': None,
}
o = SSD1306(128, 64, drv)
o.init()

or

drv = SPI(RST=31, CS=3)

You can add point transformation callback, used during flush:

def transform_ij(lcd, i, j):
    offset_width = lcd.height // 2
    if 0 <= i < offset_width:
        i = i + offset_width
    else:
        i = i - offset_width

    return (i,j)


lcd.xy_callback = transform_ij

SH1106

Based on SSD1306, has the same functions

SPI

from gfxlcd.driver.sh1106.spi import SPI
from gfxlcd.driver.sh1106.sh1106 import SH1106
drv = SPI()
lcd = SH1106(132, 64, drv)

or

lcd = SH1106(132, 64, SPI(CS=21))

NJU6450

GPIO

from gfxlcd.driver.nju6450.gpio import GPIO
from gfxlcd.driver.nju6450.nju6450 import NJU6450
drv = GPIO()
o = NJU6450(122, 32, drv)
o.init()

Custom wiring:

from gfxlcd.driver.nju6450.gpio import GPIO
from gfxlcd.driver.nju6450.nju6450 import NJU6450
drv = GPIO()
drv.pins = {
    'A0': 17,
    'E1': 22,
    'E2': 21,
    'D0': 23,
    'D1': 24,
    'D2': 25,
    'D3': 12,
    'D4': 16,
    'D5': 20,
    'D6': 26,
    'D7': 19,
    'RST': 5,
}
o = NJU6450(122, 32, drv)
o.init()

ILI9325

GPIO

from gfxlcd.driver.ili9325.gpio import GPIO
from gfxlcd.driver.ili9325.ili9325 import ILI9325
drv = GPIO()
o = ILI9325(240, 320, drv)
o.init()

Custom pins:

from gfxlcd.driver.ili9325.gpio import GPIO
from gfxlcd.driver.ili9325.ili9325 import ILI9325
drv = GPIO()
drv.pins = {
    'RS': 27,
    'W': 17,
    'DB8': 22,
    'DB9': 23,
    'DB10': 24,
    'DB11': 5,
    'DB12': 12,
    'DB13': 16,
    'DB14': 20,
    'DB15': 21,
    'RST': 25,
    'LED': None,
    'CS': None
}
o = ILI9325(240, 320, drv)
o.init()

ILI9486

SPI

from gfxlcd.driver.ili9486.spi import SPI
from gfxlcd.driver.ili9486.ili9486 import ILI9486
drv = SPI()
o = ILI9486(320, 480, drv)
o.rotation = 270
o.init()

Drawing functions

draw_pixel(x, y)

draw_line(from_x, from_y, to_x, to_y)

draw_rect(x1, y1, x2, y2)

draw_circle(x1, y1, radius)

draw_arc(x1, y1, radius, from_angle, to_angle

fill_rect(x1, y1, x2, y2)

draw_image(x, y, PIL.Image)

draw_text(x, y, text)

Colours

lcd.color = (r, g, b)

lcd.background_color = (r, g ,b)

lcd.threshold = 255 - for images a threshold between black and white (on monochrome)

lcd.transparency_color = [110, 57] #110 - color(s) that are skipped during drawing an image

Fonts

Font class implements Font abstract and is a class that has a dictionary with each char:

(..)
[0x3C, 0x66, 0x03, 0x03, 0x73, 0x66, 0x7C, 0x00],   # U+0047 (G)
(..)

There is one font for now, 8x8 and named Font8x8 and is used by default.

Touch panels

AD7843

Constructor:

AD7843(width, height, (int_pin), (callback), (cs_pin))

Can be used with int_pin and cs_pin

def callback(position):
    print('(x,y)', position)

touch = AD7843(240, 320, 26, callback, 17)
touch.init()

or without:

touch = AD7843(240, 320)
touch.init()

while True:
    try:
        time.sleep(0.05)
        ret = touch.get_position()
        if ret:
            print(ret[0], ret[1])

    except KeyboardInterrupt:
        touch.close()

There is no automatic calibration. It must be done manually.

self.correction = {
    'x': 364,
    'y': 430,
    'ratio_x': 14.35,
    'ratio_y': 10.59
}

Wiring

SSD1306

SPI

SPI wiring + 2 additional pins. Defaults:

LCD             Raspberry Pi
GND   ----------- GND
+3.3V ----------- +3.3V
SCL   ----------- G11
SDA   ----------- G10
RST   ----------- G13
D/C   ----------- G6

NJU6450

GPIO

Default wiring:

 LCD                          Raspberry Pi
1 (Vss)  ------- GND
2 (Vdd)  ------- +5V
3 (V0)   ---[-\-] 10k
               \--- GND
4 (A0)   ---------------------- G17
5 (E1)   ---------------------- G22
6 (E2)   ---------------------- G21
7 (R/W)  ------- GND
8 (D0)   ---------------------- G23
9 (D1)   ---------------------- G24
10 (D2)  ---------------------- G25
11 (D3)  ---------------------- G12
12 (D4)  ---------------------- G16
13 (D5)  ---------------------- G20
14 (D6)  ---------------------- G26
15 (D7)  ---------------------- G19
16 (RST) ------- +5V
17 (A)   ------- +5V
18 (K)   ------- GND

ILI9325

GPIO

Default:

TFT                          Raspberry Pi 2B

GND   ------------------------ GND
Vcc   ------------------------ 3.3
RS    ------------------------ G27 (data[H]/cmd[L])
WR    ------------------------ G17 
RD    ------------------------ 3.3 (never read from screen)
DB8   ------------------------ G22
DB9   ------------------------ G23
DB10  ------------------------ G24
DB11  ------------------------ G5
DB12  ------------------------ G12
DB13  ------------------------ G16
DB14  ------------------------ G20
DB15  ------------------------ G21
CS    ------------------------ GND (always selected) (or connect to GPIO pin)
REST  ------------------------ G25
LED_A ------------------------ 3.3 (can be connected to GPIO pin) 

ILI9486 (Waveshare)

SPI

Default:

RPi                    Shield
G17 ----------------- TP_IRQ
G24 ----------------- RS
G25 ----------------- RST
G9  ----------------- LCD_CS
G7  ----------------- TP_CS

HD44780 emulation

This driver can work with CharLCD and emulate char LCD

ili_drv = ILIGPIO()
ili_drv.pins['LED'] = 6
ili_drv.pins['CS'] = 18
lcd = ILI9325(240, 320, ili_drv)
lcd.auto_flush = False
lcd.rotation = 0

drv = HD44780(lcd)
lcd = CharLCD(drv.width, drv.height, drv, 0, 0)
lcd.init()

lcd.write('-!Second blarg!')
lcd.write("-second line", 0, 1)
lcd.flush()