# SSD1306 OLED 128x64 Display

The ESP32 has two Hardware supported [SPI Buses](https://docs.micropython.org/en/latest/esp32/quickref.html#hardware-spi-bus). This project makes use of the VSPI Bus(id = 2) to drive the [Adafruit ssd1306 OLED Display](https://www.adafruit.com/product/326).

## PIN Outs

| Channel | ESP32           | OLED          | Comments                    |   
|---------|-----------------|-----------|---------------------------------|
| MISO    |                 |           | Master in slave out. *Unused*   |
| MOSI    | D23 : GPIO23    | Data      | Master out slave in.            |
| SCK     | D18 : GPIO18    | Clk       | Clock.                          |
| DC      | D4 : GPIO4      | DC        |                                 |
| CS      | D5 : GPIO5      | CS        | Chip select.                    |
| RST     | D2 : GPIO2      | Rst       | Reset.                          |
| V+      | 3v3             | Vin       |                                 |
| GND     | GND             | Gnd       |                                 |

# Usage

The `SSD1306_SPI` driver has a simple interface.

To clear the screen:
```
oled.fill(0)
oled.show()
```

To invert colors:
```
oled.invert(True)
```

A `DisplayWriter` was added as a convenience to writing out messages to the OLED. Use this for printing text messages to the display. Newline characters will dwa
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