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https://github.com/robert-hh/SH1106

MicroPython driver for the SH1106 OLED controller
https://github.com/robert-hh/SH1106

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MicroPython driver for the SH1106 OLED controller

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README 

        
# Driver for the SH1106 display



This driver consists mostly of the work of Radomir Dopieralski (@deshipu).

I added a few functions and changed the existing ones so it matches better

my needs for a project.



A modified version of this driver compatible with [nano-gui widget library](https://github.com/peterhinch/micropython-nano-gui) is hosted in that project.



## Features



Use OLED display with the SH1106 driver with SPI or I2C. It is based on the MicroPython

framebuffer class and consists wrappers for this class as well as special methods

for controlling the display.



### Content Rotation



The `rotate` parameter in the constructor allows you to rotate the display by a 90, 180 or 270

degrees clockwise. 180 degrees are easy, because this can be done using only hardware flags of the

SH1106 display. 90 and 270 degrees however are not. These come at a price: Since we will have to it

in software, a second, internal framebuffer will be created, using an additional

`width * height / 8` bytes of RAM. Also, each call to `show()` will take about 33% longer.



Set `width` and `height` in the constructor to the _physical_ dimensions of your display, regardless

of how you would like to rotate it.



You can use the `flip()` method to toggle between 0 and 180 degrees of rotation, or between 90 and

270 degrees, at runtime, which is equivalent to rotating the contents for 180 degrees compared to

whatever the rotation was before. It is however not possible to switch from "portrait" to

"landscape" or vice versa at runtime, because of the additional buffer required.



## Connection



The SH1106 supports next to thers the I2C or SPI interface. The connection depends on the interface used

and the number of devices in the system. Especially the ESP8266 with their small

number of GPIO ports may require optimization.



### I2C

SCL and SDA have to be connected as minimum. The driver also resets the device by the reset PIN.

If your are low on GPIO ports, reset can be applied by a dedicated circuit, like the MCP100-300.



### SPI

SCLK, MOSI, D/C are always required. If the display is the only SPI device in the set-up,

CS may be tied to GND. Reset has also to be connected, unless it is driven

by an external circuit.



## Class



The driver contains the SH1106 class and the derived SH1106_I2C and SH1106_SPI classes.

Besides the constructors, the methods are the same.



### I2C

```

display = sh1106.SH1106_I2C(width, height, i2c, reset, address, rotate=0, delay=0)

```

- width and height define the size of the display

- i2c is an I2C object, which has to be created beforehand and tells the ports for SDA and SCL.

- res is the GPIO Pin object for the reset connection. It will be initialized by the driver.

If it is not needed, `None` has to be supplied.

- adr is the I2C address of the display. Default 0x3c or 60

- rotate defines display content rotation. See above for details and caveats.

- delay specifies an optional delay during poweron. The quantity is ms.



### SPI

```

display = sh1106.SH1106_SPI(width, height, spi, dc, res, cs, rotate=0, delay=0)

```

- width and height define the size of the display

- spi is an SPI object, which has to be created beforehand and tells the ports for SCLJ and MOSI.

MISO is not used.

- dc is the GPIO Pin object for the Data/Command selection. It will be initialized by the driver.

- res is the GPIO Pin object for the reset connection. It will be initialized by the driver.

If it is not needed, it can be set to `None` or omitted. In this case the default value

of `None` applies.

- cs is the GPIO Pin object for the CS connection. It will be initialized by the driver.

If it is not needed, it can be set to `None` or omitted. In this case the default value

of `None` applies.

- rotate defines display content rotation. See above for details and caveats.

- delay specifies an optional delay during poweron. The quantity is ms.



## Methods



### display.init_display()

```

display.init_display()

```

Initializes the display, fills it with the color 0 and displays the empty screen. It also tries

to apply the reset signal, if it is connected ( = not `None`).



### display.power_on() and display.power_off()



```

display.poweron()

display.poweroff()

display.sleep(state)

```

Enable and disable the display. `display.sleep(True)` is identical to `display.poweroff()`,

`display.sleep(False)` is equivalent to `display.poweron()`.

Other than the literal meaning could tell, it does not switch the power line(Vcc)

of the display.



###  display.contrast()



```

display.contrast(level)

```

Set the display's contrast to the given level. The range is 0..255. For a single color

display like the SH1106, this is actually the brightness.



###  display.invert()

```

display.invert(flag)

```

Invert the content of the display, depending on the value of Flag. This is immediately

effective for the whole display.

- flag = True  Invert

- flag = False Normal mode



###  display.flip()

```

display.flip([flag=None[, update=True]])

```

Rotate the content of the display an additional 180 degrees, depending on the value of `flag`.



- `True`: If you selected 0 or 90 degrees of rotation in the constructor, rotation will be set to 180 or 270, respectively. Else, it has no effect.

- `False`: If you selected 180 or 270 degrees of rotation in the constructor, rotation will be set to 0 or 90, respectively. Else, it has no effect.

- `None`: Toggle flip on or off: 0 degrees will become 180, 90 will become 270, 180 will become 0 and 270 will become 90.



To become fully effective, you have to run `display.show()`. If the parameter `update` is `True`,

`show()` is called by the function itself.



###  display.show()



Display the content of the frame buffer on the display.

```

display.show()

```

The usual program flow would set-up/update the frame buffer content with a sequence of calls

an the call display.show() for the content to be shown (see examples below).



## Framebuffer Methods



The below listed display methods of the framebuffer class are mirrored in this

class. For a documentation, please look into the MicroPython documentation at http://docs.micropython.org/en/latest/pyboard/library/framebuf.html?highlight=framebuf#module-framebuf:



- fill

- fill_rect

- line

- vline

- hline

- rect

- pixel

- scroll

- text

- blit



The text is displayed with the built-in

8x8 pixel font, which support the ASCII character set values 32..127. The text overlays

the previous content; 'on' pixels in a character will not overwrite existing 'off' pixels.

If you want to rewrite an area of the screen, you have to clear it beforehand,

e.g. with the `fill_rect()` method.



Remark: If you want to use other font styles and sizes, have a look at

the work of Peter Hinch (@pythoncoder) at https://github.com/peterhinch/micropython-font-to-py



### display.reset()

```

display.reset()

```

Attempt to reset the display by toggling the reset line. This is obviously only effective

is reset is connected. Otherwise it's a No-Op.



# Sample Code



## SPI

```

# MicroPython SH1106 OLED driver

#

# Pin Map SPI for ESP8266

#   - 3v - xxxxxx   - Vcc

#   - G  - xxxxxx   - Gnd

#   - D7 - GPIO 13  - Din / MOSI fixed

#   - D5 - GPIO 14  - Clk / SCLK fixed

#   - D8 - GPIO 4   - CS (optional, if the only connected device)

#   - D2 - GPIO 5   - D/C

#   - D1 - GPIO 2   - Res (required, unless a Hardware reset circuit is connected)

#

# for CS, D/C and Res other ports may be chosen.

#

from machine import Pin, SPI

import sh1106



spi = SPI(1, baudrate=1000000)

display = sh1106.SH1106_SPI(128, 64, spi, Pin(5), Pin(2), Pin(4))

display.sleep(False)

display.fill(0)

display.text('Testing 1', 0, 0, 1)

display.show()

```

## I2C



```

# MicroPython SH1106 OLED driver

#

# Pin Map I2C for ESP8266

#   - 3v - xxxxxx   - Vcc

#   - G  - xxxxxx   - Gnd

#   - D2 - GPIO 5   - SCK / SCL

#   - D1 - GPIO 4   - DIN / SDA

#   - D0 - GPIO 16  - Res (required, unless a Hardware reset circuit is connected)

#   - G  - xxxxxx     CS

#   - G  - xxxxxx     D/C

#

# Pin's for I2C can be set almost arbitrary

#

from machine import Pin, I2C

import sh1106



i2c = I2C(scl=Pin(5), sda=Pin(4), freq=400000)

display = sh1106.SH1106_I2C(128, 64, i2c, Pin(16), 0x3c)

display.sleep(False)

display.fill(0)

display.text('Testing 1', 0, 0, 1)

display.show()

```