interface SSD1306 OLED whit STM32 using SPI

by Marwen Maghrebi

In this article, we’ll cover how to interface the SSD1306 OLED with STM32 using SPI communication, providing a step-by-step guide to set up the display and configure SPI on your STM32 microcontroller.

STM32 microcontroller interfaced with SSD1306 OLED display, showing text and graphics via I2C or SPI communication.

Things used in this project

Software apps and online services

1- STMicroelectronics STM32CubeMX

2- STMicroelectronics STM32CubeIDE

3- Proteus 8

Exploring STM32 Microcontroller Integration with SSD1306 OLED Display

In this project, the focus is on interfacing the SSD1306 OLED display with an STM32 microcontroller using the SPI communication protocol. Specifically, the project will cover initializing the SSD1306 OLED display, setting up the SPI interface on the STM32, and demonstrating basic display functions such as writing text and drawing shapes. Through this project, you will gain a comprehensive understanding of SPI communication and how to utilize it to control an OLED display with an STM32 microcontroller

Understanding SSD1306 OLED Display Capabilities Mode Implementation :

SSD1306 is commonly used in monochromatic OLED displays up to 128×64 screen resolution, offering a compact and efficient solution for portable and wearable devices. These displays emerge as the best alternative to conventional character LCDs, providing ease of interface via I2C or SPI. SSD1306 OLED displays excel in displaying complex graphics, including text, bitmap images, and animations.

STM32 SSD1306 OLED display

Comparing prices, small OLED displays prove to be a cost-effective choice compared to character LCDs. Moreover, they offer aesthetic appeal and compactness, making them perfect for wearable and portable consumer devices such as smartwatches. While character LCDs fall short in such applications, and graphic LCDs prove costlier, small OLED displays perfectly cater to the needs of modern wearable technology.

Configuring STM32 SPI Peripheral for Communication:

To kick off our project, we’ll begin by configuring the STM32 microcontroller’s SPI peripheral as a Transmit-only Master. This step is crucial for establishing communication between the microcontroller and the SSD1306 display.

STM32CubeMX Configuration:

  • Open CubeMX & Create New Project Choose The Target MCU STM32F103C6 & Double-Click Its Name
  • Go To The Clock Configuration & Set The System Clock To 8MHz

Configuration for the SPI Mode:

  • In the Categories tab, select the SPI1 & Transmit Only Master
  • In the clock parameters, set the prescaler to 8 to achieve a baud rate of 4.0 Mbits/s.

Configuration for the GPIO:

  • Configure The GPIO Pin PA3(DC) as Output Pin
  • Configure The GPIO Pin PA4 (CS) as Output Pin
  • Generate The Initialization Code & Open The Project In CubeIDE

STM32CubeIDE Configuration:

  • Write The Application Layer Code
  • oled.h & oled.c
  • fonts.h & fonts.c
  • test.h & test.c
  • horse_anim.h
  • main.c

Proteus Configuration :

  • Open Proteus & Create New Project and click next

  • Click on Pick Device
  • Search for STM32F103C6 & SSD1306
  • Click on Terminal Mode then choose (DEFAULT & POWER &GROUND)
  • finally make the circuit below and start the simulation
Interface SSD1306 OLED with STM32 using SPI circuit

That’s all!

If you have any questions or suggestions don’t hesitate to leave a comment below

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