Drive Digilent pmodOLED module from a HiFive board

• SPI interface attached via GPIO pins. Uses SiFive SPI device, or alternatively
  simple GPIO bitbanging.
• SSD1306 controller.
• 128x32 display.

(note: this is an older version of the software when the wiring was different).

Wiring up

See display.c under “Wiring” how to wire connect the PMOD connector
to the HiFive GPIO pins.

Usage

• Build the freedom-e-sdk
• Check out this repository into the software subdirectory.

  cd software
  git clone https://github.com/laanwj/pmodoled.git
  cd ..

• Compile

  make software PROGRAM=pmodoled

  Alternatively you can run make -C software/pmodoled yourself. This is useful
  during incremental development as no automatic make clean will be run.

• Upload program to device

  make upload PROGRAM=pmodoled

Demo

The program will automatically launch after it is uploaded.

Initially it will display a zooming mandelbrot set on the display, and log a
bit of debug information to the UART.

At the moment there are two modes:

• Mandelbrot mode: Show a zooming mandelbrot set. To switch mode, type any
  character on the serial console.

• Terminal mode: the device will act as a simple terminal: everything you enter
  on the serial console will be printed to the display. Newline and backspace
  should work as expected. Escape exits to the next mode.