10 min

Create breathtaking graphics and animations with PSP27801 and STM32F303RC

Color your world

OLED C Click with UNI-DS v8

Published Sep 15, 2023

Click board™

OLED C Click

Development board



NECTO Studio



Dive into the world of vibrant visuals and immersive experiences as we showcase how this OLED display solution can transform your product design and captivate your audience.



Hardware Overview

How does it work?

OLED C Click is based on the PSP27801, a 25x25mm 96x96px full-color square OLED display from Shenzhen Boxing World Technology. The graphics driver used on this OLED display is the SSD1351, the display driver IC from Solomon Systech. The graphics driver comes with the embedded 128x128x18-bit SRAM display buffer. It is designed to work with a common cathode type of OLED display and has both parallel (8080/6800) and serial interfaces for communication. The SSD1351 controller also has built-in functionalities like vertical and horizontal scrolling, programmable frame rate, row and column remapping, and color swapping, and supports two color modes: 65K (6:5:6) and 262K (6:6:6). The OLED

C Click uses a standard 4-Wire SPI serial interface or parallel to communicate with the host MCU. It also occupies several other pins of the mikroBUS™ socket, such as the RST pin for resetting the OLED display, and the R/W pin of the mikroBUS™ socket is used only for parallel communication, which should be pulled to a LOW logic state when using serial communication as is the case here. The D/C is a data/command pin and is in a tight connection with the CS pin, as when the CS is at the LOW logic level, the display expects data or command. In addition to the display's main power supply, taken from the 3.3V mikroBUS™ power rail, the PSP27801 has another power pin, more precisely, the power supply for its DC/DC

converter circuit. For that reason, this Click board™ uses a low-power onboard step-up converter TPS61041, which can be turned ON or OFF through the EN pin of the mikroBUS™ socket, providing a 15V power supply out of 3.3V mikroBUS™ rail. The EN pin turns the step-up converter ON or OFF and, consequently - the OLED screen itself. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

OLED C Click top side image
OLED C Click bottom side image

Features overview

Development board

UNI-DS v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different STM32, Kinetis, TIVA, CEC, MSP, PIC, dsPIC, PIC32, and AVR MCUs regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over WiFi. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, UNI-DS v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the UNI-DS v8 development board contains the components necessary for the most efficient operation of the same board. An advanced integrated CODEGRIP programmer/debugger module offers many valuable programming/debugging options, including support for JTAG, SWD, and SWO Trace (Single Wire Output)), and seamless integration with the Mikroe software environment. Besides, it also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector. Communication options such as USB-UART, USB

HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet is also included. In addition, it also has the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options for the TFT board line of products and character-based LCD. UNI-DS v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

UNI-DS v8 horizontal image

Microcontroller Overview

MCU Card / MCU



8th Generation


ARM Cortex-M4

MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


Used MCU Pins

mikroBUS™ mapper

SPI Chip Select
SPI Clock
Power Supply

Take a closer look


OLED C Click Schematic schematic

Step by step

Project assembly

Fusion for PIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the UNI-DS v8 as your development board.

Fusion for PIC v8 front image hardware assembly
Buck 22 Click front image hardware assembly
SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly
v8 SiBRAIN MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto image step 7 hardware assembly
Necto image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

Software Support

Library Description

This library contains API for OLED C Click driver.

Key functions:

  • oledc_fill_screen - Fill Screen

  • oledc_image - Draw BMP Image

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

 * \file 
 * \brief OledC Click example
 * # Description
 * This demo demonstrates the use of the OLED C click board and the control of
 * the OLED C display.
 * The demo application is composed of two sections :
 * ## Application Init 
 * Initializes driver init and OLED C init and sets full screen on white color
 * with writting demo text.
 * ## Application Task  
 * This function is composed of three sections :
 *  -  Display demo rectangle.
 *  -  Display demo line.
 *  -  Display demo image.
 * \author MikroE Team
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "oledc.h"
#include "oledc_font.h"
#include "oledc_image.h"

// ------------------------------------------------------------------ VARIABLES

static oledc_t oledc;
static log_t logger;

#define text1 "Hello"
#define text2  "this is the demo"
#define text3  "for OLED C click"

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
    log_cfg_t log_cfg;
    oledc_cfg_t cfg;

     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    oledc_cfg_setup( &cfg );
    oledc_init( &oledc, &cfg );

    oledc_default_cfg( &oledc );
    oledc_fill_screen( &oledc, 0xFFFF );

    oledc_set_font( &oledc, guiFont_Tahoma_8_Regular, 0 );
    oledc_text( &oledc, text1, 15, 10 );
    oledc_text( &oledc, text2, 5, 30 );
    oledc_text( &oledc, text3, 5, 45 );
    Delay_ms( 1000 );

void application_task ( void )
    oledc_fill_screen( &oledc, 0xFFFF );

    // Rectangle demo
    oledc_rectangle( &oledc, 0, 0, 96, 96, 0xF000 );
    Delay_ms( 500 );
    oledc_rectangle( &oledc, 5, 5, 91, 91, 0xFF00 );
    Delay_ms( 500 );
    oledc_rectangle( &oledc, 10, 10, 86, 86, 0x00F0 );
    Delay_ms( 500 );
    oledc_rectangle( &oledc, 15, 15, 81, 81, 0x0F0F );
    Delay_ms( 500 );
    oledc_rectangle( &oledc, 20, 20, 76, 76, 0xF000 );
    Delay_ms( 500 );
    oledc_rectangle( &oledc, 25, 25, 71, 71, 0xFF00 );

    // Line demo 
    oledc_rectangle( &oledc, 25, 25, 71, 27, 0 );
    oledc_rectangle( &oledc, 25, 71, 71, 73, 0 );
    oledc_rectangle( &oledc, 25, 25, 27, 71, 0 );
    oledc_rectangle( &oledc, 68, 25, 71, 71, 0 );
    Delay_ms( 3000 );

    // Image demo 
    oledc_image( &oledc, me_logo_bmp, 0, 0 );
    Delay_ms( 2000 );

void main ( void )
    application_init( );

    for ( ; ; )
        application_task( );

// ------------------------------------------------------------------------ END

Additional Support