Digilent PMOD OLED RGB Hardware Driver

This is a work-in-progress (WIP) hardware driver implementation for the Digilent Pmod OLEDrgb Board.

The aim of this project is to provide a simple means of using the Pmod OLEDrgb on the Zybo Z7 platform:

• Physical layer (PL) will be responsible for power on, power of, and boot configuration of the Pmod OLEDrgb
• PL will instantiate a buffer to which processor subsytem (PS) can write SPI commands to control the display
• PS will write to buffer using AXI4/AXI-LITE

Running as a WIP

Since the project is still a work in progress, I am yet to migrate the project to a complete build system (currently, Bazel build is still WIP).

Building and running the current WIP outputs a .vcd waveform demonstrating basic startup functionality in the controller. This can be done as follows:

1. Run verilator to create a software executable:

cd src
verilator -Wall --trace -cc oled_controller.sv oled_power_on.sv timer_microsecond.sv timer_microseconds.sv --exe oled_controller.cpp

2. Run the generated executable:

./obj_dir/Voled_controller

3. View the output waveform using GTKWave:

gtkwave waveform.vcd

Resources

The following web pages are relevant to this project:

• Pmod OLEDrgb reference manual
  • Contains abridged configuration information and basic I/O specification
• SSD1331 Datasheet
  • Contains detailed summary of all available SPI commands for the driver IC